/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf -i ../../../trunk/examples/svcomp/loop-acceleration/multivar_1-1.c -------------------------------------------------------------------------------- This is Ultimate 0.2.0-b8ad66e [2020-10-23 21:47:11,054 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-10-23 21:47:11,059 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-10-23 21:47:11,119 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2020-10-23 21:47:11,152 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-10-23 21:47:11,155 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-10-23 21:47:11,158 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-10-23 21:47:11,160 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-10-23 21:47:11,162 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-10-23 21:47:11,165 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-10-23 21:47:11,173 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-10-23 21:47:11,189 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-10-23 21:47:11,191 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-10-23 21:47:11,192 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-10-23 21:47:11,194 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-10-23 21:47:11,196 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-10-23 21:47:11,205 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-10-23 21:47:11,218 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-10-23 21:47:11,219 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-10-23 21:47:11,220 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-10-23 21:47:11,221 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf [2020-10-23 21:47:11,243 INFO L113 SettingsManager]: Loading preferences was successful [2020-10-23 21:47:11,243 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-10-23 21:47:11,249 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-10-23 21:47:11,249 INFO L138 SettingsManager]: * sizeof long=4 [2020-10-23 21:47:11,249 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-10-23 21:47:11,250 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-10-23 21:47:11,250 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-10-23 21:47:11,250 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-10-23 21:47:11,250 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-10-23 21:47:11,250 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-10-23 21:47:11,252 INFO L138 SettingsManager]: * sizeof long double=12 [2020-10-23 21:47:11,252 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-10-23 21:47:11,252 INFO L138 SettingsManager]: * Use constant arrays=true [2020-10-23 21:47:11,253 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-10-23 21:47:11,253 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-10-23 21:47:11,253 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2020-10-23 21:47:11,253 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-10-23 21:47:11,253 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-10-23 21:47:11,254 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-10-23 21:47:11,254 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-10-23 21:47:11,254 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2020-10-23 21:47:11,254 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-10-23 21:47:11,254 INFO L138 SettingsManager]: * Use separate solver for trace checks=false 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2020-10-23 21:47:11,714 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-10-23 21:47:11,757 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-10-23 21:47:11,761 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-10-23 21:47:11,762 INFO L271 PluginConnector]: Initializing CDTParser... [2020-10-23 21:47:11,763 INFO L275 PluginConnector]: CDTParser initialized [2020-10-23 21:47:11,764 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/multivar_1-1.c [2020-10-23 21:47:11,854 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/af2468697/6b7763fca45347a7b6e008f34e4ed883/FLAG452454b97 [2020-10-23 21:47:12,500 INFO L306 CDTParser]: Found 1 translation units. [2020-10-23 21:47:12,501 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/multivar_1-1.c [2020-10-23 21:47:12,507 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/af2468697/6b7763fca45347a7b6e008f34e4ed883/FLAG452454b97 [2020-10-23 21:47:12,863 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/af2468697/6b7763fca45347a7b6e008f34e4ed883 [2020-10-23 21:47:12,866 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-10-23 21:47:12,872 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-10-23 21:47:12,875 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-10-23 21:47:12,875 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-10-23 21:47:12,879 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-10-23 21:47:12,880 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.10 09:47:12" (1/1) ... [2020-10-23 21:47:12,884 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@38d5935a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:47:12, skipping insertion in model container [2020-10-23 21:47:12,884 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.10 09:47:12" (1/1) ... [2020-10-23 21:47:12,893 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-10-23 21:47:12,908 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-10-23 21:47:13,071 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-23 21:47:13,089 INFO L203 MainTranslator]: Completed pre-run [2020-10-23 21:47:13,107 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-23 21:47:13,126 INFO L208 MainTranslator]: Completed translation [2020-10-23 21:47:13,126 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:47:13 WrapperNode [2020-10-23 21:47:13,127 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-10-23 21:47:13,128 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-10-23 21:47:13,128 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-10-23 21:47:13,128 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-10-23 21:47:13,143 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:47:13" (1/1) ... [2020-10-23 21:47:13,143 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:47:13" (1/1) ... [2020-10-23 21:47:13,151 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:47:13" (1/1) ... [2020-10-23 21:47:13,152 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:47:13" (1/1) ... [2020-10-23 21:47:13,158 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:47:13" (1/1) ... [2020-10-23 21:47:13,162 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:47:13" (1/1) ... [2020-10-23 21:47:13,164 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:47:13" (1/1) ... [2020-10-23 21:47:13,166 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-10-23 21:47:13,167 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-10-23 21:47:13,167 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-10-23 21:47:13,167 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-10-23 21:47:13,169 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:47:13" (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 [2020-10-23 21:47:13,259 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-10-23 21:47:13,260 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-10-23 21:47:13,260 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2020-10-23 21:47:13,260 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-10-23 21:47:13,260 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-10-23 21:47:13,261 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-10-23 21:47:13,261 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2020-10-23 21:47:13,261 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2020-10-23 21:47:13,261 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-10-23 21:47:13,261 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-10-23 21:47:13,262 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-10-23 21:47:13,262 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-10-23 21:47:13,262 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-10-23 21:47:13,262 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-10-23 21:47:13,263 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-10-23 21:47:13,263 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-10-23 21:47:13,263 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-10-23 21:47:13,263 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-10-23 21:47:13,561 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-10-23 21:47:13,562 INFO L298 CfgBuilder]: Removed 1 assume(true) statements. [2020-10-23 21:47:13,564 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.10 09:47:13 BoogieIcfgContainer [2020-10-23 21:47:13,564 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-10-23 21:47:13,566 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-10-23 21:47:13,567 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-10-23 21:47:13,571 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-10-23 21:47:13,571 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.10 09:47:12" (1/3) ... [2020-10-23 21:47:13,573 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4f5b1d2c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.10 09:47:13, skipping insertion in model container [2020-10-23 21:47:13,573 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:47:13" (2/3) ... [2020-10-23 21:47:13,573 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4f5b1d2c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.10 09:47:13, skipping insertion in model container [2020-10-23 21:47:13,574 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.10 09:47:13" (3/3) ... [2020-10-23 21:47:13,576 INFO L111 eAbstractionObserver]: Analyzing ICFG multivar_1-1.c [2020-10-23 21:47:13,593 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-10-23 21:47:13,600 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-10-23 21:47:13,619 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-10-23 21:47:13,665 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-10-23 21:47:13,668 INFO L378 AbstractCegarLoop]: Hoare is true [2020-10-23 21:47:13,668 INFO L379 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2020-10-23 21:47:13,669 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-10-23 21:47:13,669 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-10-23 21:47:13,669 INFO L382 AbstractCegarLoop]: Difference is false [2020-10-23 21:47:13,669 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-10-23 21:47:13,669 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-10-23 21:47:13,700 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states. [2020-10-23 21:47:13,715 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-10-23 21:47:13,716 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 21:47:13,718 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 21:47:13,718 INFO L429 AbstractCegarLoop]: === Iteration 1 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 21:47:13,733 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 21:47:13,733 INFO L82 PathProgramCache]: Analyzing trace with hash -1824432034, now seen corresponding path program 1 times [2020-10-23 21:47:13,744 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 21:47:13,745 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1900744343] [2020-10-23 21:47:13,746 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 21:47:13,843 INFO L321 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-10-23 21:47:13,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:47:14,176 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 31 [2020-10-23 21:47:14,178 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 21:47:14,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:47:14,231 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-23 21:47:14,237 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1900744343] [2020-10-23 21:47:14,240 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 21:47:14,241 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-10-23 21:47:14,241 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1564411236] [2020-10-23 21:47:14,249 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-10-23 21:47:14,251 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-23 21:47:14,269 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-10-23 21:47:14,271 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-10-23 21:47:14,274 INFO L87 Difference]: Start difference. First operand 37 states. Second operand 3 states. [2020-10-23 21:47:14,414 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 21:47:14,414 INFO L93 Difference]: Finished difference Result 49 states and 53 transitions. [2020-10-23 21:47:14,416 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-10-23 21:47:14,417 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-10-23 21:47:14,418 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 21:47:14,425 INFO L225 Difference]: With dead ends: 49 [2020-10-23 21:47:14,426 INFO L226 Difference]: Without dead ends: 28 [2020-10-23 21:47:14,430 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-10-23 21:47:14,449 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-10-23 21:47:14,478 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-10-23 21:47:14,480 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-10-23 21:47:14,481 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2020-10-23 21:47:14,484 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 21 [2020-10-23 21:47:14,484 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 21:47:14,484 INFO L481 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2020-10-23 21:47:14,485 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-10-23 21:47:14,485 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2020-10-23 21:47:14,486 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-10-23 21:47:14,486 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 21:47:14,486 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 21:47:14,487 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-10-23 21:47:14,487 INFO L429 AbstractCegarLoop]: === Iteration 2 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 21:47:14,488 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 21:47:14,488 INFO L82 PathProgramCache]: Analyzing trace with hash -2110723544, now seen corresponding path program 1 times [2020-10-23 21:47:14,489 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 21:47:14,489 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1421670060] [2020-10-23 21:47:14,489 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 21:47:14,498 INFO L321 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-10-23 21:47:14,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:47:14,811 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 21:47:14,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:47:14,827 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-23 21:47:14,827 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1421670060] [2020-10-23 21:47:14,828 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 21:47:14,828 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-10-23 21:47:14,828 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [459737838] [2020-10-23 21:47:14,829 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-10-23 21:47:14,829 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-23 21:47:14,830 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-10-23 21:47:14,830 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-10-23 21:47:14,831 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 6 states. [2020-10-23 21:47:15,173 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 21:47:15,174 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2020-10-23 21:47:15,174 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-10-23 21:47:15,174 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 21 [2020-10-23 21:47:15,175 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 21:47:15,176 INFO L225 Difference]: With dead ends: 37 [2020-10-23 21:47:15,176 INFO L226 Difference]: Without dead ends: 31 [2020-10-23 21:47:15,178 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2020-10-23 21:47:15,179 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-10-23 21:47:15,188 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 29. [2020-10-23 21:47:15,188 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-10-23 21:47:15,190 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2020-10-23 21:47:15,190 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 21 [2020-10-23 21:47:15,190 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 21:47:15,190 INFO L481 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2020-10-23 21:47:15,191 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-10-23 21:47:15,191 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2020-10-23 21:47:15,192 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-10-23 21:47:15,192 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 21:47:15,192 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 21:47:15,192 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-10-23 21:47:15,192 INFO L429 AbstractCegarLoop]: === Iteration 3 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 21:47:15,193 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 21:47:15,193 INFO L82 PathProgramCache]: Analyzing trace with hash 1542746123, now seen corresponding path program 1 times [2020-10-23 21:47:15,193 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 21:47:15,194 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1030819107] [2020-10-23 21:47:15,194 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 21:47:15,476 WARN L193 SmtUtils]: Spent 210.00 ms on a formula simplification. DAG size of input: 37 DAG size of output: 34