/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/cohencu-ll_unwindbound20.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 13:55:16,451 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 13:55:16,452 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 13:55:16,480 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 13:55:16,486 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 13:55:16,487 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 13:55:16,487 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 13:55:16,488 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 13:55:16,489 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 13:55:16,493 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 13:55:16,494 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 13:55:16,495 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 13:55:16,496 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 13:55:16,500 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 13:55:16,502 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 13:55:16,504 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 13:55:16,505 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 13:55:16,510 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 13:55:16,511 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 13:55:16,511 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 13:55:16,512 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 13:55:16,525 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 13:55:16,526 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 13:55:16,527 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-02 13:55:16,527 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-02 13:55:16,527 INFO L138 SettingsManager]: * Use SBE=true [2021-05-02 13:55:16,527 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 13:55:16,527 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 13:55:16,527 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 13:55:16,527 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 13:55:16,528 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 13:55:16,528 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 13:55:16,528 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 13:55:16,528 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 13:55:16,528 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 13:55:16,528 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 13:55:16,528 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 13:55:16,528 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 13:55:16,528 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 13:55:16,529 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 13:55:16,529 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 13:55:16,529 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 13:55:16,529 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 13:55:16,529 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-02 13:55:16,529 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-02 13:55:16,529 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 13:55:16,530 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-02 13:55:16,530 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 13:55:16,530 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-02 13:55:16,530 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 13:55:16,771 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 13:55:16,787 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 13:55:16,788 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 13:55:16,789 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 13:55:16,790 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 13:55:16,790 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/cohencu-ll_unwindbound20.c [2021-05-02 13:55:16,842 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/da509836b/f60246ee418a4cafb0e3cf221dfb1caa/FLAG62a1527be [2021-05-02 13:55:17,195 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 13:55:17,196 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/cohencu-ll_unwindbound20.c [2021-05-02 13:55:17,201 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/da509836b/f60246ee418a4cafb0e3cf221dfb1caa/FLAG62a1527be [2021-05-02 13:55:17,217 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/da509836b/f60246ee418a4cafb0e3cf221dfb1caa [2021-05-02 13:55:17,219 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 13:55:17,220 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 13:55:17,225 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 13:55:17,225 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 13:55:17,242 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 13:55:17,242 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 01:55:17" (1/1) ... [2021-05-02 13:55:17,243 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5c0e7414 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:55:17, skipping insertion in model container [2021-05-02 13:55:17,243 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 01:55:17" (1/1) ... [2021-05-02 13:55:17,249 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 13:55:17,263 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 13:55:17,383 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/cohencu-ll_unwindbound20.c[596,609] [2021-05-02 13:55:17,406 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 13:55:17,426 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 13:55:17,464 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/cohencu-ll_unwindbound20.c[596,609] [2021-05-02 13:55:17,485 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 13:55:17,494 INFO L208 MainTranslator]: Completed translation [2021-05-02 13:55:17,494 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:55:17 WrapperNode [2021-05-02 13:55:17,495 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 13:55:17,495 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 13:55:17,495 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 13:55:17,495 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 13:55:17,502 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:55:17" (1/1) ... [2021-05-02 13:55:17,503 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:55:17" (1/1) ... [2021-05-02 13:55:17,514 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:55:17" (1/1) ... [2021-05-02 13:55:17,515 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:55:17" (1/1) ... [2021-05-02 13:55:17,518 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:55:17" (1/1) ... [2021-05-02 13:55:17,521 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:55:17" (1/1) ... [2021-05-02 13:55:17,522 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:55:17" (1/1) ... [2021-05-02 13:55:17,523 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 13:55:17,523 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 13:55:17,523 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 13:55:17,524 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 13:55:17,524 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:55:17" (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 13:55:17,586 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 13:55:17,586 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 13:55:17,586 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 13:55:17,586 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-02 13:55:17,586 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 13:55:17,586 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 13:55:17,587 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 13:55:17,587 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 13:55:17,587 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 13:55:17,587 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 13:55:17,587 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_unsigned_short [2021-05-02 13:55:17,587 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-02 13:55:17,588 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 13:55:17,588 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 13:55:17,589 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 13:55:17,589 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 13:55:17,589 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 13:55:17,589 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 13:55:17,589 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 13:55:17,590 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 13:55:17,812 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 13:55:17,813 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-02 13:55:17,813 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 01:55:17 BoogieIcfgContainer [2021-05-02 13:55:17,814 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 13:55:17,814 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 13:55:17,814 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 13:55:17,816 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 13:55:17,816 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 01:55:17" (1/3) ... [2021-05-02 13:55:17,817 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2237cc85 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 01:55:17, skipping insertion in model container [2021-05-02 13:55:17,817 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:55:17" (2/3) ... [2021-05-02 13:55:17,817 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2237cc85 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 01:55:17, skipping insertion in model container [2021-05-02 13:55:17,817 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 01:55:17" (3/3) ... [2021-05-02 13:55:17,818 INFO L111 eAbstractionObserver]: Analyzing ICFG cohencu-ll_unwindbound20.c [2021-05-02 13:55:17,835 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-02 13:55:17,837 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 13:55:17,858 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 13:55:17,885 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 13:55:17,885 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 13:55:17,885 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-02 13:55:17,885 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 13:55:17,885 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 13:55:17,885 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 13:55:17,885 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 13:55:17,885 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 13:55:17,898 INFO L276 IsEmpty]: Start isEmpty. Operand has 31 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 14 states have internal predecessors, (18), 13 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2021-05-02 13:55:17,901 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-02 13:55:17,901 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:55:17,902 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:55:17,902 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:55:17,906 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:55:17,906 INFO L82 PathProgramCache]: Analyzing trace with hash 1839589780, now seen corresponding path program 1 times [2021-05-02 13:55:17,911 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:55:17,911 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1422897361] [2021-05-02 13:55:17,911 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:55:18,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:55:18,103 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:55:18,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:55:18,124 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 13:55:18,124 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:55:18,125 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1422897361] [2021-05-02 13:55:18,125 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1422897361] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:55:18,125 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 13:55:18,125 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 13:55:18,126 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [246397014] [2021-05-02 13:55:18,129 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 13:55:18,129 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:55:18,141 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 13:55:18,141 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 13:55:18,143 INFO L87 Difference]: Start difference. First operand has 31 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 14 states have internal predecessors, (18), 13 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:55:18,265 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:55:18,266 INFO L93 Difference]: Finished difference Result 57 states and 95 transitions. [2021-05-02 13:55:18,266 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 13:55:18,267 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-05-02 13:55:18,267 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:55:18,271 INFO L225 Difference]: With dead ends: 57 [2021-05-02 13:55:18,272 INFO L226 Difference]: Without dead ends: 27 [2021-05-02 13:55:18,273 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 45.4ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 13:55:18,282 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-05-02 13:55:18,294 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 26. [2021-05-02 13:55:18,295 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 10 states have (on average 1.3) internal successors, (13), 11 states have internal predecessors, (13), 13 states have call successors, (13), 3 states have call predecessors, (13), 2 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-05-02 13:55:18,296 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 37 transitions. [2021-05-02 13:55:18,297 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 37 transitions. Word has length 11 [2021-05-02 13:55:18,297 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:55:18,297 INFO L480 AbstractCegarLoop]: Abstraction has 26 states and 37 transitions. [2021-05-02 13:55:18,297 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:55:18,297 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 37 transitions. [2021-05-02 13:55:18,297 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-02 13:55:18,297 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:55:18,298 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:55:18,298 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 13:55:18,298 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:55:18,298 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:55:18,298 INFO L82 PathProgramCache]: Analyzing trace with hash 660459433, now seen corresponding path program 1 times [2021-05-02 13:55:18,298 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:55:18,299 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [250172677] [2021-05-02 13:55:18,299 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:55:18,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:55:18,353 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:55:18,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:55:18,363 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 13:55:18,364 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:55:18,364 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [250172677] [2021-05-02 13:55:18,364 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [250172677] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:55:18,364 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 13:55:18,364 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 13:55:18,364 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [732962084] [2021-05-02 13:55:18,365 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 13:55:18,365 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:55:18,365 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 13:55:18,366 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-02 13:55:18,366 INFO L87 Difference]: Start difference. First operand 26 states and 37 transitions. Second operand has 5 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:55:18,509 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:55:18,510 INFO L93 Difference]: Finished difference Result 40 states and 56 transitions. [2021-05-02 13:55:18,510 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 13:55:18,510 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2021-05-02 13:55:18,510 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:55:18,511 INFO L225 Difference]: With dead ends: 40 [2021-05-02 13:55:18,512 INFO L226 Difference]: Without dead ends: 28 [2021-05-02 13:55:18,513 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 47.7ms TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-02 13:55:18,514 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-05-02 13:55:18,525 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2021-05-02 13:55:18,525 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 12 states have (on average 1.25) internal successors, (15), 13 states have internal predecessors, (15), 13 states have call successors, (13), 3 states have call predecessors, (13), 2 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-05-02 13:55:18,529 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 39 transitions. [2021-05-02 13:55:18,530 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 39 transitions. Word has length 12 [2021-05-02 13:55:18,530 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:55:18,530 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 39 transitions. [2021-05-02 13:55:18,530 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:55:18,531 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 39 transitions. [2021-05-02 13:55:18,531 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-02 13:55:18,532 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:55:18,532 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:55:18,532 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 13:55:18,532 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:55:18,533 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:55:18,533 INFO L82 PathProgramCache]: Analyzing trace with hash 662008565, now seen corresponding path program 1 times [2021-05-02 13:55:18,533 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:55:18,533 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [660170861] [2021-05-02 13:55:18,533 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:55:18,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:55:18,614 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:55:18,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:55:18,632 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 13:55:18,634 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:55:18,635 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [660170861] [2021-05-02 13:55:18,635 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [660170861] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:55:18,635 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 13:55:18,635 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-02 13:55:18,635 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1910613902] [2021-05-02 13:55:18,635 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 13:55:18,635 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:55:18,636 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 13:55:18,636 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-02 13:55:18,636 INFO L87 Difference]: Start difference. First operand 28 states and 39 transitions. Second operand has 6 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:55:18,831 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:55:18,831 INFO L93 Difference]: Finished difference Result 34 states and 44 transitions. [2021-05-02 13:55:18,831 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 13:55:18,831 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2021-05-02 13:55:18,831 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:55:18,832 INFO L225 Difference]: With dead ends: 34 [2021-05-02 13:55:18,832 INFO L226 Difference]: Without dead ends: 32 [2021-05-02 13:55:18,832 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 145.6ms TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2021-05-02 13:55:18,833 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-05-02 13:55:18,837 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2021-05-02 13:55:18,837 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 15 states have (on average 1.2) internal successors, (18), 16 states have internal predecessors, (18), 13 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-05-02 13:55:18,837 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 42 transitions. [2021-05-02 13:55:18,838 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 42 transitions. Word has length 12 [2021-05-02 13:55:18,838 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:55:18,838 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 42 transitions. [2021-05-02 13:55:18,838 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:55:18,838 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 42 transitions. [2021-05-02 13:55:18,838 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-02 13:55:18,838 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:55:18,838 INFO L523 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:55:18,838 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-05-02 13:55:18,839 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:55:18,839 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:55:18,839 INFO L82 PathProgramCache]: Analyzing trace with hash 2023221563, now seen corresponding path program 1 times [2021-05-02 13:55:18,839 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:55:18,839 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1261395463] [2021-05-02 13:55:18,839 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:55:18,846 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:55:18,846 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [142586529] [2021-05-02 13:55:18,846 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 13:55:18,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:55:18,903 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-02 13:55:18,907 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:55:18,983 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 13:55:18,984 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:55:18,984 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1261395463] [2021-05-02 13:55:18,984 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:55:18,984 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [142586529] [2021-05-02 13:55:18,984 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [142586529] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:55:18,984 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:55:18,984 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-02 13:55:18,984 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [59320606] [2021-05-02 13:55:18,985 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 13:55:18,985 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:55:18,985 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 13:55:18,985 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-05-02 13:55:18,985 INFO L87 Difference]: Start difference. First operand 32 states and 42 transitions. Second operand has 8 states, 7 states have (on average 1.5714285714285714) internal successors, (11), 6 states have internal predecessors, (11), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 13:55:19,214 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:55:19,214 INFO L93 Difference]: Finished difference Result 54 states and 73 transitions. [2021-05-02 13:55:19,214 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 13:55:19,215 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 1.5714285714285714) internal successors, (11), 6 states have internal predecessors, (11), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 17 [2021-05-02 13:55:19,215 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:55:19,216 INFO L225 Difference]: With dead ends: 54 [2021-05-02 13:55:19,216 INFO L226 Difference]: Without dead ends: 52 [2021-05-02 13:55:19,217 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 43.8ms TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2021-05-02 13:55:19,218 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2021-05-02 13:55:19,229 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2021-05-02 13:55:19,229 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 22 states have (on average 1.1818181818181819) internal successors, (26), 24 states have internal predecessors, (26), 23 states have call successors, (23), 6 states have call predecessors, (23), 5 states have return successors, (21), 20 states have call predecessors, (21), 21 states have call successors, (21) [2021-05-02 13:55:19,230 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 70 transitions. [2021-05-02 13:55:19,230 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 70 transitions. Word has length 17 [2021-05-02 13:55:19,230 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:55:19,230 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 70 transitions. [2021-05-02 13:55:19,230 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 7 states have (on average 1.5714285714285714) internal successors, (11), 6 states have internal predecessors, (11), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 13:55:19,230 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 70 transitions. [2021-05-02 13:55:19,231 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-02 13:55:19,231 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:55:19,231 INFO L523 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:55:19,443 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:55:19,443 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:55:19,444 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:55:19,444 INFO L82 PathProgramCache]: Analyzing trace with hash 1612678773, now seen corresponding path program 1 times [2021-05-02 13:55:19,444 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:55:19,444 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [416417243] [2021-05-02 13:55:19,444 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:55:19,451 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:55:19,451 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1795708957] [2021-05-02 13:55:19,451 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 13:55:19,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:55:19,503 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-02 13:55:19,504 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:55:19,579 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 13:55:19,579 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:55:19,580 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [416417243] [2021-05-02 13:55:19,580 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:55:19,580 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1795708957] [2021-05-02 13:55:19,580 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1795708957] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:55:19,580 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:55:19,580 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-02 13:55:19,580 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1948675005] [2021-05-02 13:55:19,580 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 13:55:19,581 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:55:19,581 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 13:55:19,581 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-05-02 13:55:19,581 INFO L87 Difference]: Start difference. First operand 51 states and 70 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), 3 states have call successors, (3) [2021-05-02 13:55:19,746 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:55:19,746 INFO L93 Difference]: Finished difference Result 58 states and 76 transitions. [2021-05-02 13:55:19,747 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 13:55:19,747 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), 3 states have call successors, (3) Word has length 22 [2021-05-02 13:55:19,747 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:55:19,748 INFO L225 Difference]: With dead ends: 58 [2021-05-02 13:55:19,748 INFO L226 Difference]: Without dead ends: 56 [2021-05-02 13:55:19,748 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 43.9ms TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2021-05-02 13:55:19,748 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2021-05-02 13:55:19,753 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2021-05-02 13:55:19,753 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 25 states have (on average 1.16) internal successors, (29), 27 states have internal predecessors, (29), 23 states have call successors, (23), 7 states have call predecessors, (23), 6 states have return successors, (21), 20 states have call predecessors, (21), 21 states have call successors, (21) [2021-05-02 13:55:19,754 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 73 transitions. [2021-05-02 13:55:19,754 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 73 transitions. Word has length 22 [2021-05-02 13:55:19,754 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:55:19,754 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 73 transitions. [2021-05-02 13:55:19,754 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), 3 states have call successors, (3) [2021-05-02 13:55:19,754 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 73 transitions. [2021-05-02 13:55:19,755 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-05-02 13:55:19,755 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:55:19,755 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:55:19,968 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:55:19,969 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:55:19,969 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:55:19,970 INFO L82 PathProgramCache]: Analyzing trace with hash 1625830715, now seen corresponding path program 1 times [2021-05-02 13:55:19,970 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:55:19,971 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1734210993] [2021-05-02 13:55:19,971 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:55:19,976 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:55:19,976 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1210968950] [2021-05-02 13:55:19,976 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:55:20,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:55:20,018 INFO L263 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-02 13:55:20,020 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:55:20,091 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 5 proven. 7 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-05-02 13:55:20,091 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:55:20,091 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1734210993] [2021-05-02 13:55:20,092 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:55:20,092 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1210968950] [2021-05-02 13:55:20,092 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1210968950] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:55:20,092 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:55:20,092 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-02 13:55:20,092 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1010318368] [2021-05-02 13:55:20,092 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 13:55:20,092 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:55:20,092 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 13:55:20,093 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-05-02 13:55:20,093 INFO L87 Difference]: Start difference. First operand 55 states and 73 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, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 13:55:20,254 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:55:20,254 INFO L93 Difference]: Finished difference Result 62 states and 79 transitions. [2021-05-02 13:55:20,254 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 13:55:20,254 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, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) Word has length 27 [2021-05-02 13:55:20,255 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:55:20,255 INFO L225 Difference]: With dead ends: 62 [2021-05-02 13:55:20,255 INFO L226 Difference]: Without dead ends: 54 [2021-05-02 13:55:20,256 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 38.3ms TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2021-05-02 13:55:20,256 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-05-02 13:55:20,267 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2021-05-02 13:55:20,268 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 28 states have (on average 1.1071428571428572) internal successors, (31), 29 states have internal predecessors, (31), 18 states have call successors, (18), 8 states have call predecessors, (18), 7 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) [2021-05-02 13:55:20,269 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 65 transitions. [2021-05-02 13:55:20,269 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 65 transitions. Word has length 27 [2021-05-02 13:55:20,269 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:55:20,269 INFO L480 AbstractCegarLoop]: Abstraction has 54 states and 65 transitions. [2021-05-02 13:55:20,269 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, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 13:55:20,269 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 65 transitions. [2021-05-02 13:55:20,270 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-05-02 13:55:20,270 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:55:20,270 INFO L523 BasicCegarLoop]: trace histogram [7, 6, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:55:20,480 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:55:20,481 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:55:20,481 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:55:20,481 INFO L82 PathProgramCache]: Analyzing trace with hash 1440923632, now seen corresponding path program 1 times [2021-05-02 13:55:20,481 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:55:20,481 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [127158662] [2021-05-02 13:55:20,482 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:55:20,488 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:55:20,488 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1345147566] [2021-05-02 13:55:20,488 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:55:20,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:55:20,528 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 13:55:20,529 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:55:20,542 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:20,544 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:20,545 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:20,555 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:20,557 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:20,558 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:20,596 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:20,598 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:20,616 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 30 proven. 2 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-05-02 13:55:20,617 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:55:20,617 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [127158662] [2021-05-02 13:55:20,617 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:55:20,617 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1345147566] [2021-05-02 13:55:20,617 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1345147566] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:55:20,617 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:55:20,617 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2021-05-02 13:55:20,617 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [562935067] [2021-05-02 13:55:20,617 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 13:55:20,617 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:55:20,618 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 13:55:20,618 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-02 13:55:20,618 INFO L87 Difference]: Start difference. First operand 54 states and 65 transitions. Second operand has 5 states, 5 states have (on average 3.2) internal successors, (16), 4 states have internal predecessors, (16), 4 states have call successors, (9), 4 states have call predecessors, (9), 3 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) [2021-05-02 13:55:20,659 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:55:20,659 INFO L93 Difference]: Finished difference Result 72 states and 87 transitions. [2021-05-02 13:55:20,659 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 13:55:20,660 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.2) internal successors, (16), 4 states have internal predecessors, (16), 4 states have call successors, (9), 4 states have call predecessors, (9), 3 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) Word has length 45 [2021-05-02 13:55:20,660 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:55:20,661 INFO L225 Difference]: With dead ends: 72 [2021-05-02 13:55:20,661 INFO L226 Difference]: Without dead ends: 56 [2021-05-02 13:55:20,665 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 12.4ms TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 13:55:20,667 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2021-05-02 13:55:20,678 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2021-05-02 13:55:20,679 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 30 states have (on average 1.1) internal successors, (33), 31 states have internal predecessors, (33), 18 states have call successors, (18), 8 states have call predecessors, (18), 7 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) [2021-05-02 13:55:20,681 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 67 transitions. [2021-05-02 13:55:20,681 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 67 transitions. Word has length 45 [2021-05-02 13:55:20,682 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:55:20,682 INFO L480 AbstractCegarLoop]: Abstraction has 56 states and 67 transitions. [2021-05-02 13:55:20,682 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 3.2) internal successors, (16), 4 states have internal predecessors, (16), 4 states have call successors, (9), 4 states have call predecessors, (9), 3 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) [2021-05-02 13:55:20,682 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 67 transitions. [2021-05-02 13:55:20,683 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-05-02 13:55:20,683 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:55:20,684 INFO L523 BasicCegarLoop]: trace histogram [7, 6, 6, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:55:20,884 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:55:20,884 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:55:20,885 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:55:20,885 INFO L82 PathProgramCache]: Analyzing trace with hash 1933038948, now seen corresponding path program 1 times [2021-05-02 13:55:20,885 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:55:20,885 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1178922194] [2021-05-02 13:55:20,885 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:55:20,890 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:55:20,890 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1048757029] [2021-05-02 13:55:20,890 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:55:20,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:55:20,949 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 23 conjunts are in the unsatisfiable core [2021-05-02 13:55:20,961 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:55:21,098 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 26 proven. 5 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-05-02 13:55:21,098 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:55:21,098 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1178922194] [2021-05-02 13:55:21,098 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:55:21,098 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1048757029] [2021-05-02 13:55:21,098 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1048757029] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:55:21,098 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:55:21,098 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-02 13:55:21,098 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [780903595] [2021-05-02 13:55:21,099 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 13:55:21,099 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:55:21,099 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 13:55:21,099 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-05-02 13:55:21,099 INFO L87 Difference]: Start difference. First operand 56 states and 67 transitions. Second operand has 9 states, 8 states have (on average 2.125) internal successors, (17), 7 states have internal predecessors, (17), 4 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 13:55:21,301 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:55:21,302 INFO L93 Difference]: Finished difference Result 78 states and 98 transitions. [2021-05-02 13:55:21,303 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 13:55:21,303 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 2.125) internal successors, (17), 7 states have internal predecessors, (17), 4 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 45 [2021-05-02 13:55:21,303 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:55:21,303 INFO L225 Difference]: With dead ends: 78 [2021-05-02 13:55:21,304 INFO L226 Difference]: Without dead ends: 76 [2021-05-02 13:55:21,304 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 58.4ms TimeCoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2021-05-02 13:55:21,304 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2021-05-02 13:55:21,309 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 75. [2021-05-02 13:55:21,309 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 37 states have (on average 1.1081081081081081) internal successors, (41), 39 states have internal predecessors, (41), 28 states have call successors, (28), 10 states have call predecessors, (28), 9 states have return successors, (26), 25 states have call predecessors, (26), 26 states have call successors, (26) [2021-05-02 13:55:21,310 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 95 transitions. [2021-05-02 13:55:21,310 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 95 transitions. Word has length 45 [2021-05-02 13:55:21,310 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:55:21,310 INFO L480 AbstractCegarLoop]: Abstraction has 75 states and 95 transitions. [2021-05-02 13:55:21,310 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 8 states have (on average 2.125) internal successors, (17), 7 states have internal predecessors, (17), 4 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 13:55:21,310 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 95 transitions. [2021-05-02 13:55:21,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-05-02 13:55:21,311 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:55:21,311 INFO L523 BasicCegarLoop]: trace histogram [8, 7, 7, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:55:21,520 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:55:21,520 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:55:21,520 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:55:21,520 INFO L82 PathProgramCache]: Analyzing trace with hash 780782572, now seen corresponding path program 2 times [2021-05-02 13:55:21,520 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:55:21,520 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [3305581] [2021-05-02 13:55:21,521 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:55:21,527 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:55:21,527 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [972890699] [2021-05-02 13:55:21,527 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:55:21,568 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:55:21,568 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:55:21,569 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 25 conjunts are in the unsatisfiable core [2021-05-02 13:55:21,571 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:55:21,691 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 28 proven. 9 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-05-02 13:55:21,692 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:55:21,692 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [3305581] [2021-05-02 13:55:21,692 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:55:21,692 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [972890699] [2021-05-02 13:55:21,692 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [972890699] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:55:21,692 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:55:21,692 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-02 13:55:21,692 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1071914432] [2021-05-02 13:55:21,692 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 13:55:21,692 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:55:21,693 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 13:55:21,693 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-05-02 13:55:21,693 INFO L87 Difference]: Start difference. First operand 75 states and 95 transitions. Second operand has 9 states, 8 states have (on average 2.125) internal successors, (17), 7 states have internal predecessors, (17), 4 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (8), 3 states have call predecessors, (8), 4 states have call successors, (8) [2021-05-02 13:55:21,868 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:55:21,868 INFO L93 Difference]: Finished difference Result 82 states and 101 transitions. [2021-05-02 13:55:21,869 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 13:55:21,869 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 2.125) internal successors, (17), 7 states have internal predecessors, (17), 4 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (8), 3 states have call predecessors, (8), 4 states have call successors, (8) Word has length 50 [2021-05-02 13:55:21,869 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:55:21,869 INFO L225 Difference]: With dead ends: 82 [2021-05-02 13:55:21,870 INFO L226 Difference]: Without dead ends: 78 [2021-05-02 13:55:21,870 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 45.8ms TimeCoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2021-05-02 13:55:21,870 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2021-05-02 13:55:21,875 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 78. [2021-05-02 13:55:21,875 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 40 states have (on average 1.1) internal successors, (44), 42 states have internal predecessors, (44), 27 states have call successors, (27), 11 states have call predecessors, (27), 10 states have return successors, (24), 24 states have call predecessors, (24), 24 states have call successors, (24) [2021-05-02 13:55:21,875 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 95 transitions. [2021-05-02 13:55:21,875 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 95 transitions. Word has length 50 [2021-05-02 13:55:21,876 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:55:21,876 INFO L480 AbstractCegarLoop]: Abstraction has 78 states and 95 transitions. [2021-05-02 13:55:21,876 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 8 states have (on average 2.125) internal successors, (17), 7 states have internal predecessors, (17), 4 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (8), 3 states have call predecessors, (8), 4 states have call successors, (8) [2021-05-02 13:55:21,876 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 95 transitions. [2021-05-02 13:55:21,876 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-05-02 13:55:21,877 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:55:21,877 INFO L523 BasicCegarLoop]: trace histogram [12, 11, 11, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:55:22,089 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:55:22,089 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:55:22,090 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:55:22,090 INFO L82 PathProgramCache]: Analyzing trace with hash 1284663070, now seen corresponding path program 1 times [2021-05-02 13:55:22,090 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:55:22,090 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1835042068] [2021-05-02 13:55:22,090 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:55:22,095 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:55:22,095 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [936949716] [2021-05-02 13:55:22,096 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:55:22,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:55:22,142 INFO L263 TraceCheckSpWp]: Trace formula consists of 219 conjuncts, 31 conjunts are in the unsatisfiable core [2021-05-02 13:55:22,144 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:55:22,155 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:22,156 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:22,252 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:22,258 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:22,261 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:22,270 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:22,294 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:22,303 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:22,308 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:22,312 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:22,332 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:22,336 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:22,342 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:22,345 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:22,363 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:22,368 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:22,372 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:22,373 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:22,391 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:22,394 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:22,399 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:22,401 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:22,452 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:22,455 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:22,468 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:22,470 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:22,485 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:22,488 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:22,500 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:22,502 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:22,515 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:22,518 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:22,545 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:22,547 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:22,585 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:22,587 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:22,593 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:22,613 INFO L134 CoverageAnalysis]: Checked inductivity of 250 backedges. 51 proven. 9 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2021-05-02 13:55:22,613 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:55:22,613 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1835042068] [2021-05-02 13:55:22,613 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:55:22,613 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [936949716] [2021-05-02 13:55:22,613 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [936949716] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:55:22,613 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:55:22,613 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-05-02 13:55:22,614 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1781863831] [2021-05-02 13:55:22,614 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 13:55:22,614 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:55:22,615 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 13:55:22,615 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2021-05-02 13:55:22,615 INFO L87 Difference]: Start difference. First operand 78 states and 95 transitions. Second operand has 10 states, 8 states have (on average 2.25) internal successors, (18), 8 states have internal predecessors, (18), 5 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2021-05-02 13:55:22,811 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:55:22,811 INFO L93 Difference]: Finished difference Result 84 states and 100 transitions. [2021-05-02 13:55:22,812 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 13:55:22,812 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 8 states have (on average 2.25) internal successors, (18), 8 states have internal predecessors, (18), 5 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) Word has length 71 [2021-05-02 13:55:22,814 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:55:22,815 INFO L225 Difference]: With dead ends: 84 [2021-05-02 13:55:22,815 INFO L226 Difference]: Without dead ends: 82 [2021-05-02 13:55:22,816 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 62 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 140.7ms TimeCoverageRelationStatistics Valid=31, Invalid=101, Unknown=0, NotChecked=0, Total=132 [2021-05-02 13:55:22,816 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2021-05-02 13:55:22,821 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 82. [2021-05-02 13:55:22,821 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 43 states have (on average 1.0930232558139534) internal successors, (47), 45 states have internal predecessors, (47), 27 states have call successors, (27), 12 states have call predecessors, (27), 11 states have return successors, (24), 24 states have call predecessors, (24), 24 states have call successors, (24) [2021-05-02 13:55:22,822 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 98 transitions. [2021-05-02 13:55:22,822 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 98 transitions. Word has length 71 [2021-05-02 13:55:22,822 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:55:22,822 INFO L480 AbstractCegarLoop]: Abstraction has 82 states and 98 transitions. [2021-05-02 13:55:22,822 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 8 states have (on average 2.25) internal successors, (18), 8 states have internal predecessors, (18), 5 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2021-05-02 13:55:22,822 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 98 transitions. [2021-05-02 13:55:22,823 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-05-02 13:55:22,823 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:55:22,823 INFO L523 BasicCegarLoop]: trace histogram [12, 11, 11, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:55:23,040 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-05-02 13:55:23,041 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:55:23,041 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:55:23,041 INFO L82 PathProgramCache]: Analyzing trace with hash -2139863911, now seen corresponding path program 2 times [2021-05-02 13:55:23,041 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:55:23,041 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1924830102] [2021-05-02 13:55:23,041 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:55:23,052 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:55:23,052 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1001552476] [2021-05-02 13:55:23,052 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:55:23,145 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:55:23,145 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:55:23,146 INFO L263 TraceCheckSpWp]: Trace formula consists of 232 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-02 13:55:23,148 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:55:23,155 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:23,157 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:23,157 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:23,161 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:23,162 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:23,162 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:23,197 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:23,198 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:23,198 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:23,234 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:23,235 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:23,248 INFO L134 CoverageAnalysis]: Checked inductivity of 254 backedges. 60 proven. 112 refuted. 0 times theorem prover too weak. 82 trivial. 0 not checked. [2021-05-02 13:55:23,248 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:55:23,248 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1924830102] [2021-05-02 13:55:23,248 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:55:23,248 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1001552476] [2021-05-02 13:55:23,248 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1001552476] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:55:23,248 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:55:23,249 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-02 13:55:23,249 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1059165513] [2021-05-02 13:55:23,249 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 13:55:23,249 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:55:23,249 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 13:55:23,249 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 13:55:23,249 INFO L87 Difference]: Start difference. First operand 82 states and 98 transitions. Second operand has 6 states, 6 states have (on average 3.6666666666666665) internal successors, (22), 5 states have internal predecessors, (22), 5 states have call successors, (14), 5 states have call predecessors, (14), 4 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2021-05-02 13:55:23,309 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:55:23,309 INFO L93 Difference]: Finished difference Result 106 states and 125 transitions. [2021-05-02 13:55:23,309 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 13:55:23,310 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.6666666666666665) internal successors, (22), 5 states have internal predecessors, (22), 5 states have call successors, (14), 5 states have call predecessors, (14), 4 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) Word has length 73 [2021-05-02 13:55:23,310 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:55:23,310 INFO L225 Difference]: With dead ends: 106 [2021-05-02 13:55:23,310 INFO L226 Difference]: Without dead ends: 90 [2021-05-02 13:55:23,311 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 68 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 18.7ms TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-05-02 13:55:23,311 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2021-05-02 13:55:23,315 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 88. [2021-05-02 13:55:23,316 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 48 states have (on average 1.1041666666666667) internal successors, (53), 50 states have internal predecessors, (53), 27 states have call successors, (27), 13 states have call predecessors, (27), 12 states have return successors, (24), 24 states have call predecessors, (24), 24 states have call successors, (24) [2021-05-02 13:55:23,316 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 104 transitions. [2021-05-02 13:55:23,316 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 104 transitions. Word has length 73 [2021-05-02 13:55:23,316 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:55:23,316 INFO L480 AbstractCegarLoop]: Abstraction has 88 states and 104 transitions. [2021-05-02 13:55:23,316 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 3.6666666666666665) internal successors, (22), 5 states have internal predecessors, (22), 5 states have call successors, (14), 5 states have call predecessors, (14), 4 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2021-05-02 13:55:23,317 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 104 transitions. [2021-05-02 13:55:23,317 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-05-02 13:55:23,317 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:55:23,317 INFO L523 BasicCegarLoop]: trace histogram [12, 11, 11, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:55:23,535 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-05-02 13:55:23,536 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:55:23,536 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:55:23,536 INFO L82 PathProgramCache]: Analyzing trace with hash -1647748595, now seen corresponding path program 3 times [2021-05-02 13:55:23,536 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:55:23,536 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1844123572] [2021-05-02 13:55:23,536 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:55:23,541 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:55:23,541 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1463738970] [2021-05-02 13:55:23,541 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:55:23,633 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-02 13:55:23,633 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:55:23,634 INFO L263 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 29 conjunts are in the unsatisfiable core [2021-05-02 13:55:23,636 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:55:23,807 INFO L134 CoverageAnalysis]: Checked inductivity of 258 backedges. 51 proven. 17 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2021-05-02 13:55:23,807 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:55:23,807 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1844123572] [2021-05-02 13:55:23,807 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:55:23,807 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1463738970] [2021-05-02 13:55:23,807 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1463738970] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:55:23,807 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:55:23,807 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-05-02 13:55:23,807 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [16197768] [2021-05-02 13:55:23,808 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 13:55:23,808 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:55:23,808 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 13:55:23,808 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=71, Unknown=0, NotChecked=0, Total=90 [2021-05-02 13:55:23,808 INFO L87 Difference]: Start difference. First operand 88 states and 104 transitions. Second operand has 10 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 8 states have internal predecessors, (20), 5 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2021-05-02 13:55:24,065 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:55:24,065 INFO L93 Difference]: Finished difference Result 110 states and 135 transitions. [2021-05-02 13:55:24,065 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 13:55:24,065 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 8 states have internal predecessors, (20), 5 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) Word has length 73 [2021-05-02 13:55:24,066 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:55:24,066 INFO L225 Difference]: With dead ends: 110 [2021-05-02 13:55:24,066 INFO L226 Difference]: Without dead ends: 108 [2021-05-02 13:55:24,067 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 64 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 64.9ms TimeCoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2021-05-02 13:55:24,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2021-05-02 13:55:24,072 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 107. [2021-05-02 13:55:24,072 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107 states, 55 states have (on average 1.1090909090909091) internal successors, (61), 58 states have internal predecessors, (61), 37 states have call successors, (37), 15 states have call predecessors, (37), 14 states have return successors, (34), 33 states have call predecessors, (34), 34 states have call successors, (34) [2021-05-02 13:55:24,073 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 132 transitions. [2021-05-02 13:55:24,073 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 132 transitions. Word has length 73 [2021-05-02 13:55:24,073 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:55:24,073 INFO L480 AbstractCegarLoop]: Abstraction has 107 states and 132 transitions. [2021-05-02 13:55:24,073 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 8 states have internal predecessors, (20), 5 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2021-05-02 13:55:24,073 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 132 transitions. [2021-05-02 13:55:24,074 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-05-02 13:55:24,074 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:55:24,074 INFO L523 BasicCegarLoop]: trace histogram [13, 12, 12, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:55:24,293 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:55:24,293 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:55:24,293 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:55:24,293 INFO L82 PathProgramCache]: Analyzing trace with hash -904350414, now seen corresponding path program 1 times [2021-05-02 13:55:24,293 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:55:24,293 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [905001934] [2021-05-02 13:55:24,294 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:55:24,298 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:55:24,299 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1925075573] [2021-05-02 13:55:24,299 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:55:24,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:55:24,353 INFO L263 TraceCheckSpWp]: Trace formula consists of 228 conjuncts, 27 conjunts are in the unsatisfiable core [2021-05-02 13:55:24,355 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:55:24,411 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:24,417 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:24,427 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:24,428 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:24,437 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:24,438 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:24,444 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:24,445 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:24,453 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:24,454 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:24,470 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:24,472 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:24,499 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:24,517 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:24,524 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:24,528 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:24,531 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:24,554 INFO L134 CoverageAnalysis]: Checked inductivity of 296 backedges. 53 proven. 12 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2021-05-02 13:55:24,554 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:55:24,554 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [905001934] [2021-05-02 13:55:24,554 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:55:24,554 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1925075573] [2021-05-02 13:55:24,554 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1925075573] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:55:24,554 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:55:24,554 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-05-02 13:55:24,554 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [951739695] [2021-05-02 13:55:24,556 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 13:55:24,556 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:55:24,556 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 13:55:24,556 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2021-05-02 13:55:24,557 INFO L87 Difference]: Start difference. First operand 107 states and 132 transitions. Second operand has 10 states, 8 states have (on average 2.25) internal successors, (18), 8 states have internal predecessors, (18), 5 states have call successors, (15), 2 states have call predecessors, (15), 2 states have return successors, (13), 4 states have call predecessors, (13), 5 states have call successors, (13) [2021-05-02 13:55:24,733 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:55:24,733 INFO L93 Difference]: Finished difference Result 113 states and 137 transitions. [2021-05-02 13:55:24,734 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 13:55:24,734 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 8 states have (on average 2.25) internal successors, (18), 8 states have internal predecessors, (18), 5 states have call successors, (15), 2 states have call predecessors, (15), 2 states have return successors, (13), 4 states have call predecessors, (13), 5 states have call successors, (13) Word has length 76 [2021-05-02 13:55:24,734 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:55:24,736 INFO L225 Difference]: With dead ends: 113 [2021-05-02 13:55:24,736 INFO L226 Difference]: Without dead ends: 109 [2021-05-02 13:55:24,736 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 67 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 55.7ms TimeCoverageRelationStatistics Valid=31, Invalid=101, Unknown=0, NotChecked=0, Total=132 [2021-05-02 13:55:24,736 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2021-05-02 13:55:24,741 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 109. [2021-05-02 13:55:24,742 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 109 states, 57 states have (on average 1.087719298245614) internal successors, (62), 59 states have internal predecessors, (62), 37 states have call successors, (37), 16 states have call predecessors, (37), 14 states have return successors, (34), 33 states have call predecessors, (34), 34 states have call successors, (34) [2021-05-02 13:55:24,742 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 133 transitions. [2021-05-02 13:55:24,742 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 133 transitions. Word has length 76 [2021-05-02 13:55:24,742 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:55:24,743 INFO L480 AbstractCegarLoop]: Abstraction has 109 states and 133 transitions. [2021-05-02 13:55:24,743 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 8 states have (on average 2.25) internal successors, (18), 8 states have internal predecessors, (18), 5 states have call successors, (15), 2 states have call predecessors, (15), 2 states have return successors, (13), 4 states have call predecessors, (13), 5 states have call successors, (13) [2021-05-02 13:55:24,743 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 133 transitions. [2021-05-02 13:55:24,743 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-05-02 13:55:24,743 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:55:24,743 INFO L523 BasicCegarLoop]: trace histogram [13, 12, 12, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:55:24,956 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:55:24,957 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:55:24,957 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:55:24,957 INFO L82 PathProgramCache]: Analyzing trace with hash 1454229731, now seen corresponding path program 4 times [2021-05-02 13:55:24,957 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:55:24,957 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [86771238] [2021-05-02 13:55:24,957 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:55:24,962 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:55:24,962 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [701960279] [2021-05-02 13:55:24,962 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