/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/nla-digbench-scaling/sqrt1-ll_unwindbound5.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 17:23:20,262 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 17:23:20,263 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 17:23:20,281 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 17:23:20,305 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 17:23:20,306 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 17:23:20,306 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 17:23:20,307 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 17:23:20,307 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 17:23:20,308 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 17:23:20,308 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 17:23:20,309 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 17:23:20,310 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 17:23:20,314 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 17:23:20,315 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 17:23:20,317 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 17:23:20,325 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 17:23:20,332 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 17:23:20,332 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 17:23:20,333 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 17:23:20,336 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2021-05-02 17:23:20,368 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 17:23:20,368 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 17:23:20,370 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-02 17:23:20,370 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-02 17:23:20,371 INFO L138 SettingsManager]: * Use SBE=true [2021-05-02 17:23:20,371 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 17:23:20,371 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 17:23:20,371 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 17:23:20,371 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 17:23:20,371 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 17:23:20,372 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 17:23:20,372 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 17:23:20,372 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 17:23:20,372 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 17:23:20,372 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 17:23:20,372 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 17:23:20,372 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 17:23:20,372 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 17:23:20,373 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 17:23:20,373 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 17:23:20,373 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 17:23:20,373 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 17:23:20,373 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-02 17:23:20,373 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-02 17:23:20,373 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 17:23:20,373 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-02 17:23:20,373 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 17:23:20,374 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-02 17:23:20,374 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 17:23:20,643 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 17:23:20,665 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 17:23:20,667 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 17:23:20,668 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 17:23:20,669 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 17:23:20,669 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/sqrt1-ll_unwindbound5.c [2021-05-02 17:23:20,737 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1cd775d12/f2851cc35aeb43f5927629a8279ce7ac/FLAG74710f1a8 [2021-05-02 17:23:21,104 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 17:23:21,105 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/sqrt1-ll_unwindbound5.c [2021-05-02 17:23:21,110 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1cd775d12/f2851cc35aeb43f5927629a8279ce7ac/FLAG74710f1a8 [2021-05-02 17:23:21,127 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1cd775d12/f2851cc35aeb43f5927629a8279ce7ac [2021-05-02 17:23:21,129 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 17:23:21,131 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 17:23:21,132 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 17:23:21,132 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 17:23:21,134 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 17:23:21,135 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 05:23:21" (1/1) ... [2021-05-02 17:23:21,137 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6d5061a4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:23:21, skipping insertion in model container [2021-05-02 17:23:21,137 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 05:23:21" (1/1) ... [2021-05-02 17:23:21,141 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 17:23:21,154 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 17:23:21,236 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/sqrt1-ll_unwindbound5.c[520,533] [2021-05-02 17:23:21,245 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 17:23:21,251 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 17:23:21,293 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/sqrt1-ll_unwindbound5.c[520,533] [2021-05-02 17:23:21,298 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 17:23:21,307 INFO L208 MainTranslator]: Completed translation [2021-05-02 17:23:21,307 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:23:21 WrapperNode [2021-05-02 17:23:21,308 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 17:23:21,308 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 17:23:21,308 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 17:23:21,308 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 17:23:21,315 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:23:21" (1/1) ... [2021-05-02 17:23:21,315 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:23:21" (1/1) ... [2021-05-02 17:23:21,319 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:23:21" (1/1) ... [2021-05-02 17:23:21,319 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:23:21" (1/1) ... [2021-05-02 17:23:21,322 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:23:21" (1/1) ... [2021-05-02 17:23:21,325 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:23:21" (1/1) ... [2021-05-02 17:23:21,326 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:23:21" (1/1) ... [2021-05-02 17:23:21,327 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 17:23:21,328 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 17:23:21,328 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 17:23:21,328 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 17:23:21,328 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:23:21" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 17:23:21,398 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 17:23:21,399 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 17:23:21,399 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 17:23:21,399 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-02 17:23:21,399 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 17:23:21,399 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 17:23:21,399 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 17:23:21,399 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 17:23:21,399 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 17:23:21,400 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 17:23:21,400 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2021-05-02 17:23:21,400 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-02 17:23:21,400 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 17:23:21,400 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 17:23:21,402 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 17:23:21,402 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 17:23:21,402 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 17:23:21,402 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 17:23:21,402 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 17:23:21,402 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 17:23:21,591 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 17:23:21,592 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-02 17:23:21,593 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 05:23:21 BoogieIcfgContainer [2021-05-02 17:23:21,593 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 17:23:21,594 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 17:23:21,594 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 17:23:21,596 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 17:23:21,596 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 05:23:21" (1/3) ... [2021-05-02 17:23:21,610 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@487d509d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 05:23:21, skipping insertion in model container [2021-05-02 17:23:21,611 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:23:21" (2/3) ... [2021-05-02 17:23:21,611 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@487d509d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 05:23:21, skipping insertion in model container [2021-05-02 17:23:21,611 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 05:23:21" (3/3) ... [2021-05-02 17:23:21,612 INFO L111 eAbstractionObserver]: Analyzing ICFG sqrt1-ll_unwindbound5.c [2021-05-02 17:23:21,616 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-02 17:23:21,618 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 17:23:21,630 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 17:23:21,664 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 17:23:21,665 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 17:23:21,665 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-02 17:23:21,665 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 17:23:21,665 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 17:23:21,665 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 17:23:21,665 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 17:23:21,665 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 17:23:21,687 INFO L276 IsEmpty]: Start isEmpty. Operand has 26 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 14 states have internal predecessors, (18), 8 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-02 17:23:21,689 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-02 17:23:21,690 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:23:21,690 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:23:21,690 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:23:21,695 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:23:21,695 INFO L82 PathProgramCache]: Analyzing trace with hash -643130361, now seen corresponding path program 1 times [2021-05-02 17:23:21,705 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:23:21,706 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1094754571] [2021-05-02 17:23:21,706 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:23:21,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:23:21,907 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:23:21,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:23:21,920 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:23:21,920 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:23:21,920 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1094754571] [2021-05-02 17:23:21,921 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1094754571] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 17:23:21,921 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 17:23:21,921 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 17:23:21,922 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1166400183] [2021-05-02 17:23:21,925 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 17:23:21,925 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:23:21,933 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 17:23:21,933 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 17:23:21,935 INFO L87 Difference]: Start difference. First operand has 26 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 14 states have internal predecessors, (18), 8 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) 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 17:23:22,053 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:23:22,054 INFO L93 Difference]: Finished difference Result 47 states and 70 transitions. [2021-05-02 17:23:22,054 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 17:23:22,055 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 17:23:22,056 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:23:22,061 INFO L225 Difference]: With dead ends: 47 [2021-05-02 17:23:22,061 INFO L226 Difference]: Without dead ends: 22 [2021-05-02 17:23:22,065 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 52.9ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 17:23:22,077 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-05-02 17:23:22,095 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2021-05-02 17:23:22,096 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 10 states have (on average 1.3) internal successors, (13), 11 states have internal predecessors, (13), 8 states have call successors, (8), 3 states have call predecessors, (8), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 17:23:22,097 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 27 transitions. [2021-05-02 17:23:22,098 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 27 transitions. Word has length 11 [2021-05-02 17:23:22,098 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:23:22,098 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 27 transitions. [2021-05-02 17:23:22,099 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 17:23:22,099 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 27 transitions. [2021-05-02 17:23:22,100 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-02 17:23:22,101 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:23:22,101 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:23:22,101 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 17:23:22,101 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:23:22,102 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:23:22,102 INFO L82 PathProgramCache]: Analyzing trace with hash 1070997212, now seen corresponding path program 1 times [2021-05-02 17:23:22,102 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:23:22,102 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1494686614] [2021-05-02 17:23:22,102 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:23:22,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:23:22,196 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:23:22,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:23:22,212 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:23:22,213 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:23:22,213 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1494686614] [2021-05-02 17:23:22,213 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1494686614] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 17:23:22,213 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 17:23:22,213 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 17:23:22,213 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1738779874] [2021-05-02 17:23:22,214 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 17:23:22,214 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:23:22,215 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 17:23:22,215 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-02 17:23:22,215 INFO L87 Difference]: Start difference. First operand 21 states and 27 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 17:23:22,321 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:23:22,321 INFO L93 Difference]: Finished difference Result 32 states and 40 transitions. [2021-05-02 17:23:22,321 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 17:23:22,322 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 17:23:22,322 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:23:22,322 INFO L225 Difference]: With dead ends: 32 [2021-05-02 17:23:22,322 INFO L226 Difference]: Without dead ends: 23 [2021-05-02 17:23:22,323 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 71.7ms TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-02 17:23:22,323 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-05-02 17:23:22,327 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2021-05-02 17:23:22,327 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 12 states have (on average 1.25) internal successors, (15), 13 states have internal predecessors, (15), 8 states have call successors, (8), 3 states have call predecessors, (8), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 17:23:22,328 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 29 transitions. [2021-05-02 17:23:22,328 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 29 transitions. Word has length 12 [2021-05-02 17:23:22,328 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:23:22,328 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 29 transitions. [2021-05-02 17:23:22,328 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 17:23:22,329 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 29 transitions. [2021-05-02 17:23:22,329 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-02 17:23:22,329 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:23:22,329 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:23:22,329 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 17:23:22,329 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:23:22,330 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:23:22,330 INFO L82 PathProgramCache]: Analyzing trace with hash 1072665508, now seen corresponding path program 1 times [2021-05-02 17:23:22,330 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:23:22,330 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1591150616] [2021-05-02 17:23:22,330 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:23:22,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:23:22,410 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:23:22,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:23:22,421 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:23:22,422 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:23:22,422 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1591150616] [2021-05-02 17:23:22,422 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1591150616] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 17:23:22,422 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 17:23:22,422 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-02 17:23:22,422 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [245485776] [2021-05-02 17:23:22,423 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 17:23:22,423 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:23:22,423 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 17:23:22,423 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-02 17:23:22,423 INFO L87 Difference]: Start difference. First operand 23 states and 29 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 17:23:22,631 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:23:22,631 INFO L93 Difference]: Finished difference Result 36 states and 47 transitions. [2021-05-02 17:23:22,631 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 17:23:22,631 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 17:23:22,632 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:23:22,633 INFO L225 Difference]: With dead ends: 36 [2021-05-02 17:23:22,633 INFO L226 Difference]: Without dead ends: 34 [2021-05-02 17:23:22,634 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 146.2ms TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2021-05-02 17:23:22,635 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-05-02 17:23:22,652 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 32. [2021-05-02 17:23:22,653 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 16 states have (on average 1.25) internal successors, (20), 18 states have internal predecessors, (20), 12 states have call successors, (12), 4 states have call predecessors, (12), 3 states have return successors, (10), 9 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-02 17:23:22,658 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 42 transitions. [2021-05-02 17:23:22,658 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 42 transitions. Word has length 12 [2021-05-02 17:23:22,658 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:23:22,658 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 42 transitions. [2021-05-02 17:23:22,659 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 17:23:22,659 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 42 transitions. [2021-05-02 17:23:22,659 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-02 17:23:22,659 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:23:22,660 INFO L523 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:23:22,660 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-05-02 17:23:22,660 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:23:22,663 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:23:22,663 INFO L82 PathProgramCache]: Analyzing trace with hash 1640566567, now seen corresponding path program 1 times [2021-05-02 17:23:22,663 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:23:22,663 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1243798952] [2021-05-02 17:23:22,663 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:23:22,679 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:23:22,679 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1240213190] [2021-05-02 17:23:22,679 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:23:22,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:23:22,721 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-02 17:23:22,725 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:23:22,837 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:23:22,837 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:23:22,837 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1243798952] [2021-05-02 17:23:22,837 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:23:22,838 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1240213190] [2021-05-02 17:23:22,838 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1240213190] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:23:22,838 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 17:23:22,838 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-02 17:23:22,838 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1197348205] [2021-05-02 17:23:22,838 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 17:23:22,838 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:23:22,839 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 17:23:22,839 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-05-02 17:23:22,839 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 17:23:22,961 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:23:22,961 INFO L93 Difference]: Finished difference Result 40 states and 50 transitions. [2021-05-02 17:23:22,961 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 17:23:22,962 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 17:23:22,962 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:23:22,963 INFO L225 Difference]: With dead ends: 40 [2021-05-02 17:23:22,963 INFO L226 Difference]: Without dead ends: 35 [2021-05-02 17:23:22,964 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 61.4ms TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2021-05-02 17:23:22,964 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-05-02 17:23:22,973 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2021-05-02 17:23:22,974 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 19 states have (on average 1.1578947368421053) internal successors, (22), 20 states have internal predecessors, (22), 11 states have call successors, (11), 5 states have call predecessors, (11), 4 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-02 17:23:22,977 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 42 transitions. [2021-05-02 17:23:22,978 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 42 transitions. Word has length 17 [2021-05-02 17:23:22,978 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:23:22,978 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 42 transitions. [2021-05-02 17:23:22,978 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 17:23:22,978 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 42 transitions. [2021-05-02 17:23:22,979 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-05-02 17:23:22,979 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:23:22,979 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:23:23,195 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:23:23,197 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:23:23,197 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:23:23,197 INFO L82 PathProgramCache]: Analyzing trace with hash -1326533350, now seen corresponding path program 1 times [2021-05-02 17:23:23,197 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:23:23,197 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1127303383] [2021-05-02 17:23:23,197 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:23:23,203 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:23:23,204 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [375917944] [2021-05-02 17:23:23,204 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:23:23,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:23:23,248 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 17:23:23,250 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:23:23,272 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:23:23,277 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:23:23,278 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:23:23,292 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:23:23,296 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:23:23,298 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:23:23,343 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:23:23,347 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:23:23,363 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-05-02 17:23:23,363 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:23:23,364 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1127303383] [2021-05-02 17:23:23,364 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:23:23,364 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [375917944] [2021-05-02 17:23:23,364 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [375917944] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:23:23,364 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 17:23:23,364 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2021-05-02 17:23:23,364 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [269001211] [2021-05-02 17:23:23,364 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 17:23:23,365 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:23:23,365 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 17:23:23,365 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-02 17:23:23,365 INFO L87 Difference]: Start difference. First operand 35 states and 42 transitions. Second operand has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 4 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 17:23:23,399 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:23:23,400 INFO L93 Difference]: Finished difference Result 46 states and 55 transitions. [2021-05-02 17:23:23,400 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 17:23:23,400 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 4 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 30 [2021-05-02 17:23:23,403 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:23:23,404 INFO L225 Difference]: With dead ends: 46 [2021-05-02 17:23:23,404 INFO L226 Difference]: Without dead ends: 37 [2021-05-02 17:23:23,404 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 11.3ms TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 17:23:23,405 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-05-02 17:23:23,409 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2021-05-02 17:23:23,409 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 21 states have (on average 1.1428571428571428) internal successors, (24), 22 states have internal predecessors, (24), 11 states have call successors, (11), 5 states have call predecessors, (11), 4 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-02 17:23:23,412 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 44 transitions. [2021-05-02 17:23:23,412 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 44 transitions. Word has length 30 [2021-05-02 17:23:23,412 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:23:23,412 INFO L480 AbstractCegarLoop]: Abstraction has 37 states and 44 transitions. [2021-05-02 17:23:23,418 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 4 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 17:23:23,418 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 44 transitions. [2021-05-02 17:23:23,419 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-05-02 17:23:23,419 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:23:23,419 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:23:23,620 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:23:23,620 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:23:23,620 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:23:23,620 INFO L82 PathProgramCache]: Analyzing trace with hash -1324865054, now seen corresponding path program 1 times [2021-05-02 17:23:23,621 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:23:23,621 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [855857046] [2021-05-02 17:23:23,621 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:23:23,626 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:23:23,626 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [412128773] [2021-05-02 17:23:23,626 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 17:23:23,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:23:23,678 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 14 conjunts are in the unsatisfiable core [2021-05-02 17:23:23,680 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:23:23,770 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-05-02 17:23:23,771 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:23:23,771 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [855857046] [2021-05-02 17:23:23,771 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:23:23,771 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [412128773] [2021-05-02 17:23:23,779 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [412128773] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:23:23,779 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 17:23:23,779 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-02 17:23:23,779 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1070029920] [2021-05-02 17:23:23,779 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 17:23:23,779 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:23:23,780 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 17:23:23,780 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-02 17:23:23,780 INFO L87 Difference]: Start difference. First operand 37 states and 44 transitions. Second operand has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 3 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 17:23:23,839 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:23:23,839 INFO L93 Difference]: Finished difference Result 50 states and 62 transitions. [2021-05-02 17:23:23,839 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 17:23:23,840 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 3 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 30 [2021-05-02 17:23:23,840 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:23:23,840 INFO L225 Difference]: With dead ends: 50 [2021-05-02 17:23:23,840 INFO L226 Difference]: Without dead ends: 48 [2021-05-02 17:23:23,843 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 22.3ms TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-05-02 17:23:23,843 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-05-02 17:23:23,853 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 46. [2021-05-02 17:23:23,853 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 25 states have (on average 1.16) internal successors, (29), 27 states have internal predecessors, (29), 15 states have call successors, (15), 6 states have call predecessors, (15), 5 states have return successors, (13), 12 states have call predecessors, (13), 13 states have call successors, (13) [2021-05-02 17:23:23,856 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 57 transitions. [2021-05-02 17:23:23,856 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 57 transitions. Word has length 30 [2021-05-02 17:23:23,857 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:23:23,857 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 57 transitions. [2021-05-02 17:23:23,857 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 3 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 17:23:23,857 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 57 transitions. [2021-05-02 17:23:23,857 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-05-02 17:23:23,857 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:23:23,857 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 4, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:23:24,067 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:23:24,068 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:23:24,068 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:23:24,068 INFO L82 PathProgramCache]: Analyzing trace with hash 1080733609, now seen corresponding path program 2 times [2021-05-02 17:23:24,068 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:23:24,068 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2042077170] [2021-05-02 17:23:24,068 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:23:24,075 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:23:24,075 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [527227424] [2021-05-02 17:23:24,075 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 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:23:24,127 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 17:23:24,127 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:23:24,128 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 27 conjunts are in the unsatisfiable core [2021-05-02 17:23:24,131 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:23:24,211 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:23:24,213 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:23:24,263 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 12 proven. 12 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-05-02 17:23:24,263 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:23:24,263 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2042077170] [2021-05-02 17:23:24,263 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:23:24,264 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [527227424] [2021-05-02 17:23:24,264 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [527227424] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:23:24,264 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 17:23:24,264 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-02 17:23:24,264 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1578991375] [2021-05-02 17:23:24,265 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 17:23:24,265 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:23:24,265 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 17:23:24,265 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2021-05-02 17:23:24,265 INFO L87 Difference]: Start difference. First operand 46 states and 57 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, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-05-02 17:23:24,485 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:23:24,485 INFO L93 Difference]: Finished difference Result 54 states and 65 transitions. [2021-05-02 17:23:24,485 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 17:23:24,485 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, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) Word has length 35 [2021-05-02 17:23:24,486 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:23:24,486 INFO L225 Difference]: With dead ends: 54 [2021-05-02 17:23:24,486 INFO L226 Difference]: Without dead ends: 49 [2021-05-02 17:23:24,487 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 26 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 98.7ms TimeCoverageRelationStatistics Valid=31, Invalid=101, Unknown=0, NotChecked=0, Total=132 [2021-05-02 17:23:24,494 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-05-02 17:23:24,498 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2021-05-02 17:23:24,499 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 28 states have (on average 1.1071428571428572) internal successors, (31), 29 states have internal predecessors, (31), 14 states have call successors, (14), 7 states have call predecessors, (14), 6 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2021-05-02 17:23:24,499 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 57 transitions. [2021-05-02 17:23:24,499 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 57 transitions. Word has length 35 [2021-05-02 17:23:24,499 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:23:24,499 INFO L480 AbstractCegarLoop]: Abstraction has 49 states and 57 transitions. [2021-05-02 17:23:24,500 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, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-05-02 17:23:24,500 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 57 transitions. [2021-05-02 17:23:24,500 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-05-02 17:23:24,500 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:23:24,500 INFO L523 BasicCegarLoop]: trace histogram [7, 6, 6, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:23:24,703 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:23:24,703 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:23:24,703 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:23:24,703 INFO L82 PathProgramCache]: Analyzing trace with hash -1332643880, now seen corresponding path program 2 times [2021-05-02 17:23:24,704 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:23:24,704 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [427165429] [2021-05-02 17:23:24,704 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:23:24,713 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:23:24,713 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [463377840] [2021-05-02 17:23:24,713 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:23:24,758 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 17:23:24,759 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:23:24,759 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-02 17:23:24,761 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:23:24,770 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:23:24,774 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:23:24,775 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:23:24,780 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:23:24,781 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:23:24,784 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:23:24,810 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:23:24,812 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:23:24,814 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:23:24,851 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:23:24,860 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:23:24,870 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 12 proven. 46 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-05-02 17:23:24,871 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:23:24,871 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [427165429] [2021-05-02 17:23:24,871 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:23:24,871 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [463377840] [2021-05-02 17:23:24,871 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [463377840] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:23:24,871 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 17:23:24,871 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-02 17:23:24,871 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1207675411] [2021-05-02 17:23:24,872 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 17:23:24,872 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:23:24,872 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 17:23:24,873 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 17:23:24,873 INFO L87 Difference]: Start difference. First operand 49 states and 57 transitions. Second operand has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 5 states have internal predecessors, (20), 5 states have call successors, (9), 5 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 17:23:24,929 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:23:24,929 INFO L93 Difference]: Finished difference Result 60 states and 70 transitions. [2021-05-02 17:23:24,930 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 17:23:24,930 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 5 states have internal predecessors, (20), 5 states have call successors, (9), 5 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 48 [2021-05-02 17:23:24,930 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:23:24,931 INFO L225 Difference]: With dead ends: 60 [2021-05-02 17:23:24,931 INFO L226 Difference]: Without dead ends: 51 [2021-05-02 17:23:24,931 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 18.9ms TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-05-02 17:23:24,931 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-05-02 17:23:24,935 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2021-05-02 17:23:24,936 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 30 states have (on average 1.1) internal successors, (33), 31 states have internal predecessors, (33), 14 states have call successors, (14), 7 states have call predecessors, (14), 6 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2021-05-02 17:23:24,936 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 59 transitions. [2021-05-02 17:23:24,936 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 59 transitions. Word has length 48 [2021-05-02 17:23:24,936 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:23:24,936 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 59 transitions. [2021-05-02 17:23:24,936 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 5 states have internal predecessors, (20), 5 states have call successors, (9), 5 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 17:23:24,937 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 59 transitions. [2021-05-02 17:23:24,937 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-05-02 17:23:24,937 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:23:24,937 INFO L523 BasicCegarLoop]: trace histogram [7, 6, 6, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:23:25,145 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:23:25,145 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:23:25,145 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:23:25,145 INFO L82 PathProgramCache]: Analyzing trace with hash -1330975584, now seen corresponding path program 3 times [2021-05-02 17:23:25,145 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:23:25,146 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1902753799] [2021-05-02 17:23:25,146 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:23:25,151 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:23:25,151 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1173679103] [2021-05-02 17:23:25,152 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:23:25,194 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-02 17:23:25,195 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:23:25,195 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 18 conjunts are in the unsatisfiable core [2021-05-02 17:23:25,197 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:23:25,314 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 12 proven. 12 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2021-05-02 17:23:25,314 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:23:25,314 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1902753799] [2021-05-02 17:23:25,314 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:23:25,314 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1173679103] [2021-05-02 17:23:25,314 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1173679103] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:23:25,314 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 17:23:25,314 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-02 17:23:25,314 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1632560665] [2021-05-02 17:23:25,315 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 17:23:25,315 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:23:25,315 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 17:23:25,315 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-05-02 17:23:25,315 INFO L87 Difference]: Start difference. First operand 51 states and 59 transitions. Second operand has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 6 states have internal predecessors, (17), 4 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) [2021-05-02 17:23:25,394 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:23:25,395 INFO L93 Difference]: Finished difference Result 64 states and 77 transitions. [2021-05-02 17:23:25,395 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 17:23:25,395 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 6 states have internal predecessors, (17), 4 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) Word has length 48 [2021-05-02 17:23:25,395 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:23:25,396 INFO L225 Difference]: With dead ends: 64 [2021-05-02 17:23:25,396 INFO L226 Difference]: Without dead ends: 62 [2021-05-02 17:23:25,396 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 27.0ms TimeCoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-05-02 17:23:25,397 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2021-05-02 17:23:25,407 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 60. [2021-05-02 17:23:25,407 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 34 states have (on average 1.1176470588235294) internal successors, (38), 36 states have internal predecessors, (38), 18 states have call successors, (18), 8 states have call predecessors, (18), 7 states have return successors, (16), 15 states have call predecessors, (16), 16 states have call successors, (16) [2021-05-02 17:23:25,408 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 72 transitions. [2021-05-02 17:23:25,408 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 72 transitions. Word has length 48 [2021-05-02 17:23:25,408 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:23:25,408 INFO L480 AbstractCegarLoop]: Abstraction has 60 states and 72 transitions. [2021-05-02 17:23:25,409 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 6 states have internal predecessors, (17), 4 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) [2021-05-02 17:23:25,409 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 72 transitions. [2021-05-02 17:23:25,412 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-05-02 17:23:25,412 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:23:25,412 INFO L523 BasicCegarLoop]: trace histogram [8, 7, 7, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:23:25,626 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:23:25,627 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:23:25,627 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:23:25,627 INFO L82 PathProgramCache]: Analyzing trace with hash 107606955, now seen corresponding path program 4 times [2021-05-02 17:23:25,627 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:23:25,627 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1082193554] [2021-05-02 17:23:25,627 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:23:25,632 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:23:25,632 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [177467016] [2021-05-02 17:23:25,632 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:23:25,687 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 17:23:25,687 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:23:25,688 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 28 conjunts are in the unsatisfiable core [2021-05-02 17:23:25,690 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:23:25,799 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:23:25,800 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:23:25,817 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 29 proven. 28 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-05-02 17:23:25,817 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:23:25,817 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1082193554] [2021-05-02 17:23:25,817 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:23:25,817 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [177467016] [2021-05-02 17:23:25,818 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [177467016] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:23:25,818 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 17:23:25,818 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-02 17:23:25,818 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [34196159] [2021-05-02 17:23:25,818 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 17:23:25,818 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:23:25,818 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 17:23:25,818 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2021-05-02 17:23:25,819 INFO L87 Difference]: Start difference. First operand 60 states and 72 transitions. Second operand has 9 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 7 states have internal predecessors, (20), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-05-02 17:23:25,882 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:23:25,883 INFO L93 Difference]: Finished difference Result 60 states and 72 transitions. [2021-05-02 17:23:25,883 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 17:23:25,883 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 7 states have internal predecessors, (20), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 53 [2021-05-02 17:23:25,883 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:23:25,883 INFO L225 Difference]: With dead ends: 60 [2021-05-02 17:23:25,884 INFO L226 Difference]: Without dead ends: 0 [2021-05-02 17:23:25,884 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 37.2ms TimeCoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2021-05-02 17:23:25,884 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2021-05-02 17:23:25,884 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2021-05-02 17:23:25,884 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 0 states, 0 states have (on average 0.0) internal successors, (0), 0 states have internal predecessors, (0), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-02 17:23:25,884 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2021-05-02 17:23:25,885 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 53 [2021-05-02 17:23:25,885 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:23:25,885 INFO L480 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2021-05-02 17:23:25,885 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 7 states have internal predecessors, (20), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-05-02 17:23:25,885 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2021-05-02 17:23:25,885 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2021-05-02 17:23:26,102 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-05-02 17:23:26,103 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2021-05-02 17:23:26,388 INFO L198 CegarLoopUtils]: For program point reach_errorEXIT(line 5) no Hoare annotation was computed. [2021-05-02 17:23:26,388 INFO L198 CegarLoopUtils]: For program point reach_errorENTRY(line 5) no Hoare annotation was computed. [2021-05-02 17:23:26,388 INFO L198 CegarLoopUtils]: For program point reach_errorFINAL(line 5) no Hoare annotation was computed. [2021-05-02 17:23:26,388 INFO L198 CegarLoopUtils]: For program point ULTIMATE.initFINAL(line -1) no Hoare annotation was computed. [2021-05-02 17:23:26,389 INFO L194 CegarLoopUtils]: At program point ULTIMATE.initENTRY(line -1) the Hoare annotation is: (and (= |#t~string5.base| |old(#t~string5.base)|) (= |#t~string5.offset| |old(#t~string5.offset)|) (= |old(#length)| |#length|) (= |#t~string6.base| |old(#t~string6.base)|) (= |#t~string6.offset| |old(#t~string6.offset)|) (= |#t~string4.base| |old(#t~string4.base)|) (= |#NULL.base| |old(#NULL.base)|) (= ~counter~0 |old(~counter~0)|) (= |#t~string4.offset| |old(#t~string4.offset)|) (= |#NULL.offset| |old(#NULL.offset)|) (= |old(#valid)| |#valid|)) [2021-05-02 17:23:26,389 INFO L198 CegarLoopUtils]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2021-05-02 17:23:26,389 INFO L198 CegarLoopUtils]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2021-05-02 17:23:26,389 INFO L194 CegarLoopUtils]: At program point L-1(line -1) the Hoare annotation is: (= ~counter~0 0) [2021-05-02 17:23:26,389 INFO L201 CegarLoopUtils]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2021-05-02 17:23:26,389 INFO L198 CegarLoopUtils]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2021-05-02 17:23:26,389 INFO L198 CegarLoopUtils]: For program point assume_abort_if_notENTRY(lines 8 10) no Hoare annotation was computed. [2021-05-02 17:23:26,389 INFO L198 CegarLoopUtils]: For program point L9(line 9) no Hoare annotation was computed. [2021-05-02 17:23:26,389 INFO L198 CegarLoopUtils]: For program point L9-2(lines 8 10) no Hoare annotation was computed. [2021-05-02 17:23:26,389 INFO L198 CegarLoopUtils]: For program point assume_abort_if_notEXIT(lines 8 10) no Hoare annotation was computed. [2021-05-02 17:23:26,389 INFO L198 CegarLoopUtils]: For program point L33(lines 30 42) no Hoare annotation was computed. [2021-05-02 17:23:26,389 INFO L194 CegarLoopUtils]: At program point L31(line 31) the Hoare annotation is: (or (let ((.cse0 (* main_~a~0 2))) (and (= (+ .cse0 (* main_~a~0 main_~a~0) 1) main_~s~0) (= (+ .cse0 1) main_~t~0))) (not (= |old(~counter~0)| 0))) [2021-05-02 17:23:26,389 INFO L194 CegarLoopUtils]: At program point L31-1(line 31) the Hoare annotation is: (or (let ((.cse0 (* main_~a~0 2))) (and (= (+ .cse0 (* main_~a~0 main_~a~0) 1) main_~s~0) (= (+ .cse0 1) main_~t~0))) (not (= |old(~counter~0)| 0))) [2021-05-02 17:23:26,389 INFO L198 CegarLoopUtils]: For program point mainEXIT(lines 21 49) no Hoare annotation was computed. [2021-05-02 17:23:26,389 INFO L198 CegarLoopUtils]: For program point L46(line 46) no Hoare annotation was computed. [2021-05-02 17:23:26,389 INFO L198 CegarLoopUtils]: For program point mainFINAL(lines 21 49) no Hoare annotation was computed. [2021-05-02 17:23:26,389 INFO L194 CegarLoopUtils]: At program point L44(line 44) the Hoare annotation is: (or (let ((.cse0 (* main_~a~0 2))) (and (= (+ .cse0 (* main_~a~0 main_~a~0) 1) main_~s~0) (= (+ .cse0 1) main_~t~0))) (not (= |old(~counter~0)| 0))) [2021-05-02 17:23:26,390 INFO L194 CegarLoopUtils]: At program point L32(line 32) the Hoare annotation is: (or (let ((.cse0 (* main_~a~0 2))) (and (= (+ .cse0 (* main_~a~0 main_~a~0) 1) main_~s~0) (= (+ .cse0 1) main_~t~0))) (not (= |old(~counter~0)| 0))) [2021-05-02 17:23:26,390 INFO L194 CegarLoopUtils]: At program point mainENTRY(lines 21 49) the Hoare annotation is: (or (= ~counter~0 |old(~counter~0)|) (not (= |old(~counter~0)| 0))) [2021-05-02 17:23:26,390 INFO L198 CegarLoopUtils]: For program point L30-1(lines 30 42) no Hoare annotation was computed. [2021-05-02 17:23:26,390 INFO L194 CegarLoopUtils]: At program point L30-3(lines 30 42) the Hoare annotation is: (or (let ((.cse0 (* main_~a~0 2))) (and (= (+ .cse0 (* main_~a~0 main_~a~0) 1) main_~s~0) (= (+ .cse0 1) main_~t~0))) (not (= |old(~counter~0)| 0))) [2021-05-02 17:23:26,390 INFO L194 CegarLoopUtils]: At program point L30-4(lines 30 42) the Hoare annotation is: (or (let ((.cse0 (* main_~a~0 2))) (and (= (+ .cse0 (* main_~a~0 main_~a~0) 1) main_~s~0) (= (+ .cse0 1) main_~t~0))) (not (= |old(~counter~0)| 0))) [2021-05-02 17:23:26,390 INFO L194 CegarLoopUtils]: At program point L45(line 45) the Hoare annotation is: (or (let ((.cse0 (* main_~a~0 2))) (and (= (+ .cse0 (* main_~a~0 main_~a~0) 1) main_~s~0) (= (+ .cse0 1) main_~t~0))) (not (= |old(~counter~0)| 0))) [2021-05-02 17:23:26,390 INFO L201 CegarLoopUtils]: At program point __VERIFIER_assertENTRY(lines 11 17) the Hoare annotation is: true [2021-05-02 17:23:26,390 INFO L198 CegarLoopUtils]: For program point L13(lines 13 14) no Hoare annotation was computed. [2021-05-02 17:23:26,390 INFO L198 CegarLoopUtils]: For program point L12(lines 12 15) no Hoare annotation was computed. [2021-05-02 17:23:26,390 INFO L198 CegarLoopUtils]: For program point L12-2(lines 11 17) no Hoare annotation was computed. [2021-05-02 17:23:26,390 INFO L198 CegarLoopUtils]: For program point __VERIFIER_assertEXIT(lines 11 17) no Hoare annotation was computed. [2021-05-02 17:23:26,390 INFO L198 CegarLoopUtils]: For program point __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION(line 14) no Hoare annotation was computed. [2021-05-02 17:23:26,400 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 05:23:26 BoogieIcfgContainer [2021-05-02 17:23:26,401 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-05-02 17:23:26,401 INFO L168 Benchmark]: Toolchain (without parser) took 5270.58 ms. Allocated memory was 204.5 MB in the beginning and 249.6 MB in the end (delta: 45.1 MB). Free memory was 167.8 MB in the beginning and 215.9 MB in the end (delta: -48.1 MB). Peak memory consumption was 125.4 MB. Max. memory is 8.0 GB. [2021-05-02 17:23:26,401 INFO L168 Benchmark]: CDTParser took 0.12 ms. Allocated memory is still 204.5 MB. Free memory is still 184.6 MB. There was no memory consumed. Max. memory is 8.0 GB. [2021-05-02 17:23:26,401 INFO L168 Benchmark]: CACSL2BoogieTranslator took 176.01 ms. Allocated memory is still 204.5 MB. Free memory was 167.7 MB in the beginning and 188.2 MB in the end (delta: -20.5 MB). Peak memory consumption was 14.8 MB. Max. memory is 8.0 GB. [2021-05-02 17:23:26,401 INFO L168 Benchmark]: Boogie Preprocessor took 18.81 ms. Allocated memory is still 204.5 MB. Free memory was 188.2 MB in the beginning and 186.6 MB in the end (delta: 1.6 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. [2021-05-02 17:23:26,402 INFO L168 Benchmark]: RCFGBuilder took 265.12 ms. Allocated memory is still 204.5 MB. Free memory was 186.6 MB in the beginning and 171.9 MB in the end (delta: 14.7 MB). Peak memory consumption was 14.7 MB. Max. memory is 8.0 GB. [2021-05-02 17:23:26,402 INFO L168 Benchmark]: TraceAbstraction took 4806.88 ms. Allocated memory was 204.5 MB in the beginning and 249.6 MB in the end (delta: 45.1 MB). Free memory was 171.4 MB in the beginning and 215.9 MB in the end (delta: -44.6 MB). Peak memory consumption was 129.5 MB. Max. memory is 8.0 GB. [2021-05-02 17:23:26,402 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.12 ms. Allocated memory is still 204.5 MB. Free memory is still 184.6 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 176.01 ms. Allocated memory is still 204.5 MB. Free memory was 167.7 MB in the beginning and 188.2 MB in the end (delta: -20.5 MB). Peak memory consumption was 14.8 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 18.81 ms. Allocated memory is still 204.5 MB. Free memory was 188.2 MB in the beginning and 186.6 MB in the end (delta: 1.6 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. * RCFGBuilder took 265.12 ms. Allocated memory is still 204.5 MB. Free memory was 186.6 MB in the beginning and 171.9 MB in the end (delta: 14.7 MB). Peak memory consumption was 14.7 MB. Max. memory is 8.0 GB. * TraceAbstraction took 4806.88 ms. Allocated memory was 204.5 MB in the beginning and 249.6 MB in the end (delta: 45.1 MB). Free memory was 171.4 MB in the beginning and 215.9 MB in the end (delta: -44.6 MB). Peak memory consumption was 129.5 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 14]: call to reach_error is unreachable For all program executions holds that call to reach_error is unreachable at this location - StatisticsResult: Ultimate Automizer benchmark data CFG has 6 procedures, 33 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 4439.2ms, OverallIterations: 10, TraceHistogramMax: 8, EmptinessCheckTime: 14.4ms, AutomataDifference: 1112.4ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 285.6ms, InitialAbstractionConstructionTime: 18.7ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 272 SDtfs, 87 SDslu, 773 SDs, 0 SdLazy, 561 SolverSat, 87 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 533.9ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 287 GetRequests, 226 SyntacticMatches, 1 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 548.0ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=60occurred in iteration=9, InterpolantAutomatonStates: 64, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 114.7ms AutomataMinimizationTime, 10 MinimizatonAttempts, 7 StatesRemovedByMinimization, 4 NontrivialMinimizations, HoareAnnotationStatistics: 0.0ms HoareAnnotationTime, 12 LocationsWithAnnotation, 48 PreInvPairs, 74 NumberOfFragments, 208 HoareAnnotationTreeSize, 48 FomulaSimplifications, 459 FormulaSimplificationTreeSizeReduction, 120.7ms HoareSimplificationTime, 12 FomulaSimplificationsInter, 411 FormulaSimplificationTreeSizeReductionInter, 125.4ms HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 70.4ms SsaConstructionTime, 192.7ms SatisfiabilityAnalysisTime, 1109.5ms InterpolantComputationTime, 296 NumberOfCodeBlocks, 279 NumberOfCodeBlocksAsserted, 14 NumberOfCheckSat, 286 ConstructedInterpolants, 0 QuantifiedInterpolants, 1017 SizeOfPredicates, 18 NumberOfNonLiveVariables, 1045 ConjunctsInSsa, 120 ConjunctsInUnsatCore, 10 InterpolantComputations, 3 PerfectInterpolantSequences, 253/357 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 30]: Loop Invariant Derived loop invariant: (a * 2 + a * a + 1 == s && a * 2 + 1 == t) || !(\old(counter) == 0) RESULT: Ultimate proved your program to be correct! Received shutdown request...