/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/loops/invert_string-1.c -------------------------------------------------------------------------------- This is Ultimate 0.2.0-b8ad66e [2020-10-23 21:45:45,654 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-10-23 21:45:45,657 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-10-23 21:45:45,695 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2020-10-23 21:45:45,710 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-10-23 21:45:45,711 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-10-23 21:45:45,713 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-10-23 21:45:45,714 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-10-23 21:45:45,716 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-10-23 21:45:45,717 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-10-23 21:45:45,719 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-10-23 21:45:45,751 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-10-23 21:45:45,755 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-10-23 21:45:45,769 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-10-23 21:45:45,773 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-10-23 21:45:45,775 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-10-23 21:45:45,784 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-10-23 21:45:45,802 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-10-23 21:45:45,803 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-10-23 21:45:45,803 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-10-23 21:45:45,805 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 21:45:45,818 INFO L113 SettingsManager]: Loading preferences was successful [2020-10-23 21:45:45,818 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-10-23 21:45:45,820 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-10-23 21:45:45,820 INFO L138 SettingsManager]: * sizeof long=4 [2020-10-23 21:45:45,820 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-10-23 21:45:45,820 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-10-23 21:45:45,821 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-10-23 21:45:45,821 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-10-23 21:45:45,821 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-10-23 21:45:45,821 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-10-23 21:45:45,822 INFO L138 SettingsManager]: * sizeof long double=12 [2020-10-23 21:45:45,822 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-10-23 21:45:45,822 INFO L138 SettingsManager]: * Use constant arrays=true [2020-10-23 21:45:45,822 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-10-23 21:45:45,823 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-10-23 21:45:45,823 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2020-10-23 21:45:45,823 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-10-23 21:45:45,823 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-10-23 21:45:45,824 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-10-23 21:45:45,824 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-10-23 21:45:45,824 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2020-10-23 21:45:45,824 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-10-23 21:45:45,825 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2020-10-23 21:45:46,195 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-10-23 21:45:46,224 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-10-23 21:45:46,227 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-10-23 21:45:46,229 INFO L271 PluginConnector]: Initializing CDTParser... [2020-10-23 21:45:46,230 INFO L275 PluginConnector]: CDTParser initialized [2020-10-23 21:45:46,231 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/invert_string-1.c [2020-10-23 21:45:46,328 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3c9fbe302/dddd4f6f046a41daa7f9926f7bda9d15/FLAG8f2f2aa70 [2020-10-23 21:45:47,078 INFO L306 CDTParser]: Found 1 translation units. [2020-10-23 21:45:47,079 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/invert_string-1.c [2020-10-23 21:45:47,087 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3c9fbe302/dddd4f6f046a41daa7f9926f7bda9d15/FLAG8f2f2aa70 [2020-10-23 21:45:47,423 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3c9fbe302/dddd4f6f046a41daa7f9926f7bda9d15 [2020-10-23 21:45:47,426 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-10-23 21:45:47,434 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-10-23 21:45:47,436 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-10-23 21:45:47,436 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-10-23 21:45:47,440 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-10-23 21:45:47,441 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.10 09:45:47" (1/1) ... [2020-10-23 21:45:47,445 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1fb0b7e0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:45:47, skipping insertion in model container [2020-10-23 21:45:47,445 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.10 09:45:47" (1/1) ... [2020-10-23 21:45:47,456 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-10-23 21:45:47,476 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-10-23 21:45:47,663 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-23 21:45:47,672 INFO L203 MainTranslator]: Completed pre-run [2020-10-23 21:45:47,696 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-23 21:45:47,715 INFO L208 MainTranslator]: Completed translation [2020-10-23 21:45:47,716 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:45:47 WrapperNode [2020-10-23 21:45:47,716 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-10-23 21:45:47,718 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-10-23 21:45:47,718 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-10-23 21:45:47,718 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-10-23 21:45:47,732 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:45:47" (1/1) ... [2020-10-23 21:45:47,732 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:45:47" (1/1) ... [2020-10-23 21:45:47,740 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:45:47" (1/1) ... [2020-10-23 21:45:47,741 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:45:47" (1/1) ... [2020-10-23 21:45:47,749 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:45:47" (1/1) ... [2020-10-23 21:45:47,755 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:45:47" (1/1) ... [2020-10-23 21:45:47,757 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:45:47" (1/1) ... [2020-10-23 21:45:47,759 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-10-23 21:45:47,760 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-10-23 21:45:47,761 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-10-23 21:45:47,761 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-10-23 21:45:47,762 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:45:47" (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 21:45:47,891 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-10-23 21:45:47,891 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-10-23 21:45:47,891 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2020-10-23 21:45:47,892 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-10-23 21:45:47,892 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-10-23 21:45:47,892 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-10-23 21:45:47,892 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2020-10-23 21:45:47,892 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2020-10-23 21:45:47,892 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-10-23 21:45:47,893 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-10-23 21:45:47,893 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-10-23 21:45:47,893 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-10-23 21:45:47,893 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-10-23 21:45:47,893 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-10-23 21:45:47,893 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-10-23 21:45:47,894 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-10-23 21:45:47,894 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-10-23 21:45:47,894 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-10-23 21:45:47,894 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-10-23 21:45:48,237 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-10-23 21:45:48,237 INFO L298 CfgBuilder]: Removed 3 assume(true) statements. [2020-10-23 21:45:48,239 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.10 09:45:48 BoogieIcfgContainer [2020-10-23 21:45:48,240 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-10-23 21:45:48,241 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-10-23 21:45:48,242 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-10-23 21:45:48,245 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-10-23 21:45:48,246 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.10 09:45:47" (1/3) ... [2020-10-23 21:45:48,247 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@56740b3e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.10 09:45:48, skipping insertion in model container [2020-10-23 21:45:48,247 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:45:47" (2/3) ... [2020-10-23 21:45:48,248 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@56740b3e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.10 09:45:48, skipping insertion in model container [2020-10-23 21:45:48,248 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.10 09:45:48" (3/3) ... [2020-10-23 21:45:48,250 INFO L111 eAbstractionObserver]: Analyzing ICFG invert_string-1.c [2020-10-23 21:45:48,264 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-10-23 21:45:48,270 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-10-23 21:45:48,292 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-10-23 21:45:48,352 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-10-23 21:45:48,352 INFO L378 AbstractCegarLoop]: Hoare is true [2020-10-23 21:45:48,352 INFO L379 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2020-10-23 21:45:48,352 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-10-23 21:45:48,353 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-10-23 21:45:48,353 INFO L382 AbstractCegarLoop]: Difference is false [2020-10-23 21:45:48,353 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-10-23 21:45:48,353 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-10-23 21:45:48,382 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states. [2020-10-23 21:45:48,393 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-10-23 21:45:48,394 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 21:45:48,395 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, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 21:45:48,395 INFO L429 AbstractCegarLoop]: === Iteration 1 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 21:45:48,402 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 21:45:48,402 INFO L82 PathProgramCache]: Analyzing trace with hash -1377275012, now seen corresponding path program 1 times [2020-10-23 21:45:48,413 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 21:45:48,413 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1925121538] [2020-10-23 21:45:48,414 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 21:45:48,487 INFO L321 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-10-23 21:45:48,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:45:48,748 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 21:45:48,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:45:48,785 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 21:45:48,787 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1925121538] [2020-10-23 21:45:48,789 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 21:45:48,789 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-10-23 21:45:48,790 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2065409091] [2020-10-23 21:45:48,795 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-10-23 21:45:48,796 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-23 21:45:48,811 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-10-23 21:45:48,812 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-10-23 21:45:48,814 INFO L87 Difference]: Start difference. First operand 75 states. Second operand 3 states. [2020-10-23 21:45:49,017 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 21:45:49,017 INFO L93 Difference]: Finished difference Result 131 states and 146 transitions. [2020-10-23 21:45:49,018 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-10-23 21:45:49,019 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 37 [2020-10-23 21:45:49,020 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 21:45:49,046 INFO L225 Difference]: With dead ends: 131 [2020-10-23 21:45:49,046 INFO L226 Difference]: Without dead ends: 63 [2020-10-23 21:45:49,050 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-10-23 21:45:49,070 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-10-23 21:45:49,101 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2020-10-23 21:45:49,103 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2020-10-23 21:45:49,105 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 65 transitions. [2020-10-23 21:45:49,107 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 65 transitions. Word has length 37 [2020-10-23 21:45:49,107 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 21:45:49,107 INFO L481 AbstractCegarLoop]: Abstraction has 63 states and 65 transitions. [2020-10-23 21:45:49,108 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-10-23 21:45:49,108 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 65 transitions. [2020-10-23 21:45:49,109 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-10-23 21:45:49,109 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 21:45:49,110 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, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 21:45:49,113 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-10-23 21:45:49,113 INFO L429 AbstractCegarLoop]: === Iteration 2 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 21:45:49,114 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 21:45:49,114 INFO L82 PathProgramCache]: Analyzing trace with hash -1392960477, now seen corresponding path program 1 times [2020-10-23 21:45:49,115 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 21:45:49,115 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1969461775] [2020-10-23 21:45:49,115 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 21:45:49,123 INFO L321 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-10-23 21:45:49,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:45:49,294 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 21:45:49,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:45:49,329 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 21:45:49,333 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1969461775] [2020-10-23 21:45:49,333 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 21:45:49,333 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-10-23 21:45:49,333 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1154529799] [2020-10-23 21:45:49,334 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-10-23 21:45:49,334 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-23 21:45:49,337 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-10-23 21:45:49,338 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-10-23 21:45:49,338 INFO L87 Difference]: Start difference. First operand 63 states and 65 transitions. Second operand 5 states. [2020-10-23 21:45:49,638 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 21:45:49,639 INFO L93 Difference]: Finished difference Result 114 states and 119 transitions. [2020-10-23 21:45:49,639 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-10-23 21:45:49,639 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 37 [2020-10-23 21:45:49,640 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 21:45:49,643 INFO L225 Difference]: With dead ends: 114 [2020-10-23 21:45:49,643 INFO L226 Difference]: Without dead ends: 80 [2020-10-23 21:45:49,645 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-10-23 21:45:49,646 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2020-10-23 21:45:49,665 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 64. [2020-10-23 21:45:49,665 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-10-23 21:45:49,667 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 66 transitions. [2020-10-23 21:45:49,667 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 66 transitions. Word has length 37 [2020-10-23 21:45:49,667 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 21:45:49,668 INFO L481 AbstractCegarLoop]: Abstraction has 64 states and 66 transitions. [2020-10-23 21:45:49,668 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-10-23 21:45:49,668 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 66 transitions. [2020-10-23 21:45:49,669 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-10-23 21:45:49,669 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 21:45:49,670 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 21:45:49,670 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-10-23 21:45:49,670 INFO L429 AbstractCegarLoop]: === Iteration 3 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 21:45:49,671 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 21:45:49,671 INFO L82 PathProgramCache]: Analyzing trace with hash -1809621749, now seen corresponding path program 1 times [2020-10-23 21:45:49,671 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 21:45:49,672 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1368134910] [2020-10-23 21:45:49,672 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 21:45:49,747 INFO L120 Accelerator]: FastUPR could not accelerate loop because java.lang.UnsupportedOperationException: No Result found. [2020-10-23 21:45:49,748 INFO L321 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-10-23 21:45:49,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:45:49,846 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 21:45:49,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:45:49,861 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 21:45:49,862 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1368134910] [2020-10-23 21:45:49,862 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 21:45:49,862 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-10-23 21:45:49,863 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2001855309] [2020-10-23 21:45:49,863 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-10-23 21:45:49,863 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-23 21:45:49,864 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-10-23 21:45:49,864 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-10-23 21:45:49,865 INFO L87 Difference]: Start difference. First operand 64 states and 66 transitions. Second operand 5 states. [2020-10-23 21:45:50,110 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 21:45:50,110 INFO L93 Difference]: Finished difference Result 102 states and 106 transitions. [2020-10-23 21:45:50,111 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-10-23 21:45:50,111 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 44 [2020-10-23 21:45:50,112 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 21:45:50,113 INFO L225 Difference]: With dead ends: 102 [2020-10-23 21:45:50,113 INFO L226 Difference]: Without dead ends: 81 [2020-10-23 21:45:50,114 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-10-23 21:45:50,115 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2020-10-23 21:45:50,128 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 65. [2020-10-23 21:45:50,129 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-10-23 21:45:50,130 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 67 transitions. [2020-10-23 21:45:50,131 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 67 transitions. Word has length 44 [2020-10-23 21:45:50,131 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 21:45:50,131 INFO L481 AbstractCegarLoop]: Abstraction has 65 states and 67 transitions. [2020-10-23 21:45:50,131 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-10-23 21:45:50,132 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 67 transitions. [2020-10-23 21:45:50,133 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-10-23 21:45:50,133 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 21:45:50,134 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, 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 21:45:50,134 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-10-23 21:45:50,134 INFO L429 AbstractCegarLoop]: === Iteration 4 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 21:45:50,135 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 21:45:50,135 INFO L82 PathProgramCache]: Analyzing trace with hash -1119668411, now seen corresponding path program 1 times [2020-10-23 21:45:50,135 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 21:45:50,135 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [334699239] [2020-10-23 21:45:50,136 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 21:45:50,200 INFO L120 Accelerator]: FastUPR could not accelerate loop because java.lang.UnsupportedOperationException: No Result found. [2020-10-23 21:45:50,202 INFO L321 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-10-23 21:45:50,263 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:45:50,990 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 21:45:50,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:45:51,016 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 21:45:51,017 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [334699239] [2020-10-23 21:45:51,017 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 21:45:51,017 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2020-10-23 21:45:51,017 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2027598046] [2020-10-23 21:45:51,018 INFO L461 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-10-23 21:45:51,018 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-23 21:45:51,019 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-10-23 21:45:51,019 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=285, Unknown=0, NotChecked=0, Total=342 [2020-10-23 21:45:51,019 INFO L87 Difference]: Start difference. First operand 65 states and 67 transitions. Second operand 19 states. [2020-10-23 21:45:52,642 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 21:45:52,643 INFO L93 Difference]: Finished difference Result 171 states and 180 transitions. [2020-10-23 21:45:52,644 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-10-23 21:45:52,644 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 54 [2020-10-23 21:45:52,644 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 21:45:52,646 INFO L225 Difference]: With dead ends: 171 [2020-10-23 21:45:52,647 INFO L226 Difference]: Without dead ends: 168 [2020-10-23 21:45:52,648 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 358 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=355, Invalid=1367, Unknown=0, NotChecked=0, Total=1722 [2020-10-23 21:45:52,649 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2020-10-23 21:45:52,672 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 96. [2020-10-23 21:45:52,672 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 96 states. [2020-10-23 21:45:52,674 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 100 transitions. [2020-10-23 21:45:52,674 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 100 transitions. Word has length 54 [2020-10-23 21:45:52,674 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 21:45:52,675 INFO L481 AbstractCegarLoop]: Abstraction has 96 states and 100 transitions. [2020-10-23 21:45:52,675 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-10-23 21:45:52,675 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 100 transitions. [2020-10-23 21:45:52,677 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2020-10-23 21:45:52,677 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 21:45:52,677 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 21:45:52,678 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-10-23 21:45:52,678 INFO L429 AbstractCegarLoop]: === Iteration 5 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 21:45:52,678 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 21:45:52,679 INFO L82 PathProgramCache]: Analyzing trace with hash 1813373789, now seen corresponding path program 2 times [2020-10-23 21:45:52,679 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 21:45:52,679 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [988221061] [2020-10-23 21:45:52,679 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 21:45:52,948 INFO L120 Accelerator]: FastUPR could not accelerate loop because java.lang.UnsupportedOperationException: No Result found. [2020-10-23 21:45:52,951 INFO L321 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-10-23 21:45:52,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:45:53,125 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 21:45:53,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:45:53,136 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 21:45:53,137 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [988221061] [2020-10-23 21:45:53,137 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 21:45:53,137 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2020-10-23 21:45:53,138 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1428072423] [2020-10-23 21:45:53,138 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-10-23 21:45:53,138 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-23 21:45:53,139 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-10-23 21:45:53,139 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2020-10-23 21:45:53,140 INFO L87 Difference]: Start difference. First operand 96 states and 100 transitions. Second operand 9 states. [2020-10-23 21:45:53,659 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 21:45:53,659 INFO L93 Difference]: Finished difference Result 178 states and 187 transitions. [2020-10-23 21:45:53,660 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-10-23 21:45:53,660 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 61 [2020-10-23 21:45:53,660 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 21:45:53,663 INFO L225 Difference]: With dead ends: 178 [2020-10-23 21:45:53,664 INFO L226 Difference]: Without dead ends: 157 [2020-10-23 21:45:53,665 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=58, Invalid=182, Unknown=0, NotChecked=0, Total=240 [2020-10-23 21:45:53,665 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2020-10-23 21:45:53,690 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 106. [2020-10-23 21:45:53,690 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 106 states. [2020-10-23 21:45:53,692 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 110 transitions. [2020-10-23 21:45:53,693 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 110 transitions. Word has length 61 [2020-10-23 21:45:53,693 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 21:45:53,693 INFO L481 AbstractCegarLoop]: Abstraction has 106 states and 110 transitions. [2020-10-23 21:45:53,693 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-10-23 21:45:53,693 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 110 transitions. [2020-10-23 21:45:53,695 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2020-10-23 21:45:53,695 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 21:45:53,695 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 21:45:53,696 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-10-23 21:45:53,696 INFO L429 AbstractCegarLoop]: === Iteration 6 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 21:45:53,696 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 21:45:53,697 INFO L82 PathProgramCache]: Analyzing trace with hash -945090305, now seen corresponding path program 3 times [2020-10-23 21:45:53,697 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 21:45:53,697 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1385567958] [2020-10-23 21:45:53,698 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 21:45:54,072 INFO L120 Accelerator]: FastUPR could not accelerate loop because java.lang.UnsupportedOperationException: No Result found. [2020-10-23 21:45:54,074 INFO L321 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-10-23 21:45:54,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:45:54,207 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 21:45:54,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:45:54,219 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 21:45:54,220 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1385567958] [2020-10-23 21:45:54,220 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 21:45:54,221 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2020-10-23 21:45:54,221 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [529172569] [2020-10-23 21:45:54,221 INFO L461 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-10-23 21:45:54,222 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-23 21:45:54,222 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-10-23 21:45:54,223 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-10-23 21:45:54,223 INFO L87 Difference]: Start difference. First operand 106 states and 110 transitions. Second operand 10 states. [2020-10-23 21:45:54,635 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 21:45:54,636 INFO L93 Difference]: Finished difference Result 172 states and 179 transitions. [2020-10-23 21:45:54,636 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-10-23 21:45:54,636 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 64 [2020-10-23 21:45:54,637 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 21:45:54,638 INFO L225 Difference]: With dead ends: 172 [2020-10-23 21:45:54,638 INFO L226 Difference]: Without dead ends: 141 [2020-10-23 21:45:54,639 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=79, Invalid=227, Unknown=0, NotChecked=0, Total=306 [2020-10-23 21:45:54,640 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2020-10-23 21:45:54,661 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 106. [2020-10-23 21:45:54,662 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 106 states. [2020-10-23 21:45:54,663 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 109 transitions. [2020-10-23 21:45:54,663 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 109 transitions. Word has length 64 [2020-10-23 21:45:54,664 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 21:45:54,664 INFO L481 AbstractCegarLoop]: Abstraction has 106 states and 109 transitions. [2020-10-23 21:45:54,664 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-10-23 21:45:54,664 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 109 transitions. [2020-10-23 21:45:54,666 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2020-10-23 21:45:54,666 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 21:45:54,666 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 21:45:54,666 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-10-23 21:45:54,666 INFO L429 AbstractCegarLoop]: === Iteration 7 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 21:45:54,667 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 21:45:54,667 INFO L82 PathProgramCache]: Analyzing trace with hash -2070432673, now seen corresponding path program 1 times [2020-10-23 21:45:54,667 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 21:45:54,668 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [395236307] [2020-10-23 21:45:54,668 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 21:45:54,969 INFO L120 Accelerator]: FastUPR could not accelerate loop because java.lang.UnsupportedOperationException: No Result found. [2020-10-23 21:45:54,971 INFO L321 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-10-23 21:45:54,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:45:55,095 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 21:45:55,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:45:55,110 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 49 [2020-10-23 21:45:55,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:45:55,132 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 21:45:55,137 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [395236307] [2020-10-23 21:45:55,137 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 21:45:55,138 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2020-10-23 21:45:55,138 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [927782380] [2020-10-23 21:45:55,138 INFO L461 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-10-23 21:45:55,139 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-23 21:45:55,139 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-10-23 21:45:55,139 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-10-23 21:45:55,140 INFO L87 Difference]: Start difference. First operand 106 states and 109 transitions. Second operand 10 states. [2020-10-23 21:45:55,573 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 21:45:55,573 INFO L93 Difference]: Finished difference Result 150 states and 154 transitions. [2020-10-23 21:45:55,574 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-10-23 21:45:55,574 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 70 [2020-10-23 21:45:55,574 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 21:45:55,575 INFO L225 Difference]: With dead ends: 150 [2020-10-23 21:45:55,575 INFO L226 Difference]: Without dead ends: 98 [2020-10-23 21:45:55,577 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=181, Unknown=0, NotChecked=0, Total=240 [2020-10-23 21:45:55,578 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-10-23 21:45:55,600 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 82. [2020-10-23 21:45:55,600 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2020-10-23 21:45:55,601 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 84 transitions. [2020-10-23 21:45:55,601 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 84 transitions. Word has length 70 [2020-10-23 21:45:55,603 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 21:45:55,604 INFO L481 AbstractCegarLoop]: Abstraction has 82 states and 84 transitions. [2020-10-23 21:45:55,604 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-10-23 21:45:55,604 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 84 transitions. [2020-10-23 21:45:55,609 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2020-10-23 21:45:55,609 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 21:45:55,609 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 21:45:55,610 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-10-23 21:45:55,610 INFO L429 AbstractCegarLoop]: === Iteration 8 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 21:45:55,610 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 21:45:55,613 INFO L82 PathProgramCache]: Analyzing trace with hash 898072343, now seen corresponding path program 4 times [2020-10-23 21:45:55,613 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 21:45:55,614 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1853804887] [2020-10-23 21:45:55,614 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 21:45:56,174 INFO L120 Accelerator]: FastUPR could not accelerate loop because java.lang.UnsupportedOperationException: No Result found. [2020-10-23 21:45:56,176 INFO L321 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-10-23 21:45:56,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:45:57,144 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 21:45:57,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:45:57,181 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 21:45:57,182 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1853804887] [2020-10-23 21:45:57,182 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 21:45:57,182 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2020-10-23 21:45:57,182 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1830646279] [2020-10-23 21:45:57,183 INFO L461 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-10-23 21:45:57,183 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-23 21:45:57,184 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-10-23 21:45:57,184 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=440, Unknown=0, NotChecked=0, Total=506 [2020-10-23 21:45:57,184 INFO L87 Difference]: Start difference. First operand 82 states and 84 transitions. Second operand 23 states. [2020-10-23 21:45:59,561 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 21:45:59,562 INFO L93 Difference]: Finished difference Result 198 states and 207 transitions. [2020-10-23 21:45:59,562 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-10-23 21:45:59,563 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 71 [2020-10-23 21:45:59,563 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 21:45:59,565 INFO L225 Difference]: With dead ends: 198 [2020-10-23 21:45:59,566 INFO L226 Difference]: Without dead ends: 195 [2020-10-23 21:45:59,571 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 696 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=499, Invalid=2693, Unknown=0, NotChecked=0, Total=3192 [2020-10-23 21:45:59,572 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 195 states. [2020-10-23 21:45:59,601 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 195 to 123. [2020-10-23 21:45:59,602 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 123 states. [2020-10-23 21:45:59,604 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 127 transitions. [2020-10-23 21:45:59,605 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 127 transitions. Word has length 71 [2020-10-23 21:45:59,610 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 21:45:59,611 INFO L481 AbstractCegarLoop]: Abstraction has 123 states and 127 transitions. [2020-10-23 21:45:59,611 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-10-23 21:45:59,611 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 127 transitions. [2020-10-23 21:45:59,618 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-10-23 21:45:59,618 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 21:45:59,618 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 21:45:59,618 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-10-23 21:45:59,619 INFO L429 AbstractCegarLoop]: === Iteration 9 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 21:45:59,619 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 21:45:59,619 INFO L82 PathProgramCache]: Analyzing trace with hash 915375615, now seen corresponding path program 5 times [2020-10-23 21:45:59,619 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 21:45:59,620 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1248433246] [2020-10-23 21:45:59,620 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 21:46:00,192 INFO L120 Accelerator]: FastUPR could not accelerate loop because java.lang.UnsupportedOperationException: No Result found. [2020-10-23 21:46:00,194 INFO L321 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-10-23 21:46:00,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:46:00,368 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 21:46:00,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:46:00,386 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 21:46:00,387 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1248433246] [2020-10-23 21:46:00,387 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 21:46:00,387 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2020-10-23 21:46:00,389 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [858550320] [2020-10-23 21:46:00,391 INFO L461 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-10-23 21:46:00,397 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-23 21:46:00,398 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-10-23 21:46:00,402 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=106, Unknown=0, NotChecked=0, Total=132 [2020-10-23 21:46:00,402 INFO L87 Difference]: Start difference. First operand 123 states and 127 transitions. Second operand 12 states. [2020-10-23 21:46:01,047 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 21:46:01,047 INFO L93 Difference]: Finished difference Result 200 states and 209 transitions. [2020-10-23 21:46:01,050 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-10-23 21:46:01,051 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 78 [2020-10-23 21:46:01,051 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 21:46:01,053 INFO L225 Difference]: With dead ends: 200 [2020-10-23 21:46:01,053 INFO L226 Difference]: Without dead ends: 179 [2020-10-23 21:46:01,054 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 89 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=124, Invalid=476, Unknown=0, NotChecked=0, Total=600 [2020-10-23 21:46:01,055 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 179 states. [2020-10-23 21:46:01,077 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 179 to 133. [2020-10-23 21:46:01,077 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 133 states. [2020-10-23 21:46:01,078 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 137 transitions. [2020-10-23 21:46:01,079 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 137 transitions. Word has length 78 [2020-10-23 21:46:01,079 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 21:46:01,079 INFO L481 AbstractCegarLoop]: Abstraction has 133 states and 137 transitions. [2020-10-23 21:46:01,079 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-10-23 21:46:01,080 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 137 transitions. [2020-10-23 21:46:01,080 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2020-10-23 21:46:01,081 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 21:46:01,081 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 21:46:01,081 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-10-23 21:46:01,081 INFO L429 AbstractCegarLoop]: === Iteration 10 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 21:46:01,082 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 21:46:01,082 INFO L82 PathProgramCache]: Analyzing trace with hash 1276983889, now seen corresponding path program 6 times [2020-10-23 21:46:01,082 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 21:46:01,082 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [135694111] [2020-10-23 21:46:01,082 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 21:46:01,665 INFO L120 Accelerator]: FastUPR could not accelerate loop because java.lang.UnsupportedOperationException: No Result found. [2020-10-23 21:46:01,667 INFO L321 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-10-23 21:46:01,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:46:01,865 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 21:46:01,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:46:01,882 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 21:46:01,882 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [135694111] [2020-10-23 21:46:01,883 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 21:46:01,883 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2020-10-23 21:46:01,883 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [775712554] [2020-10-23 21:46:01,884 INFO L461 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-10-23 21:46:01,884 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-23 21:46:01,884 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-10-23 21:46:01,885 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=122, Unknown=0, NotChecked=0, Total=156 [2020-10-23 21:46:01,885 INFO L87 Difference]: Start difference. First operand 133 states and 137 transitions. Second operand 13 states. [2020-10-23 21:46:02,446 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 21:46:02,447 INFO L93 Difference]: Finished difference Result 199 states and 206 transitions. [2020-10-23 21:46:02,447 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-10-23 21:46:02,447 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 81 [2020-10-23 21:46:02,449 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 21:46:02,450 INFO L225 Difference]: With dead ends: 199 [2020-10-23 21:46:02,450 INFO L226 Difference]: Without dead ends: 168 [2020-10-23 21:46:02,452 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=150, Invalid=500, Unknown=0, NotChecked=0, Total=650 [2020-10-23 21:46:02,454 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2020-10-23 21:46:02,478 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 133. [2020-10-23 21:46:02,479 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 133 states. [2020-10-23 21:46:02,480 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 136 transitions. [2020-10-23 21:46:02,480 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 136 transitions. Word has length 81 [2020-10-23 21:46:02,481 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 21:46:02,481 INFO L481 AbstractCegarLoop]: Abstraction has 133 states and 136 transitions. [2020-10-23 21:46:02,481 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-10-23 21:46:02,481 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 136 transitions. [2020-10-23 21:46:02,482 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2020-10-23 21:46:02,482 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 21:46:02,482 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 21:46:02,482 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-10-23 21:46:02,483 INFO L429 AbstractCegarLoop]: === Iteration 11 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 21:46:02,483 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 21:46:02,483 INFO L82 PathProgramCache]: Analyzing trace with hash 1019615281, now seen corresponding path program 2 times [2020-10-23 21:46:02,483 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 21:46:02,484 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [202085969] [2020-10-23 21:46:02,484 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 21:46:03,289 INFO L120 Accelerator]: FastUPR could not accelerate loop because java.lang.UnsupportedOperationException: No Result found. [2020-10-23 21:46:03,292 INFO L321 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-10-23 21:46:03,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-23 21:46:03,347 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-23 21:46:03,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-23 21:46:03,428 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-23 21:46:03,478 INFO L173 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-10-23 21:46:03,478 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-10-23 21:46:03,479 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-10-23 21:46:03,507 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 23.10 09:46:03 BoogieIcfgContainer [2020-10-23 21:46:03,507 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-10-23 21:46:03,510 INFO L168 Benchmark]: Toolchain (without parser) took 16080.44 ms. Allocated memory was 155.2 MB in the beginning and 224.4 MB in the end (delta: 69.2 MB). Free memory was 112.8 MB in the beginning and 201.1 MB in the end (delta: -88.3 MB). Peak memory consumption was 109.5 MB. Max. memory is 8.0 GB. [2020-10-23 21:46:03,511 INFO L168 Benchmark]: CDTParser took 0.26 ms. Allocated memory is still 155.2 MB. Free memory is still 129.2 MB. There was no memory consumed. Max. memory is 8.0 GB. [2020-10-23 21:46:03,512 INFO L168 Benchmark]: CACSL2BoogieTranslator took 281.08 ms. Allocated memory is still 155.2 MB. Free memory was 112.2 MB in the beginning and 102.5 MB in the end (delta: 9.7 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. [2020-10-23 21:46:03,516 INFO L168 Benchmark]: Boogie Preprocessor took 42.11 ms. Allocated memory is still 155.2 MB. Free memory was 102.5 MB in the beginning and 100.9 MB in the end (delta: 1.6 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2020-10-23 21:46:03,517 INFO L168 Benchmark]: RCFGBuilder took 479.32 ms. Allocated memory is still 155.2 MB. Free memory was 100.9 MB in the beginning and 121.8 MB in the end (delta: -20.9 MB). Peak memory consumption was 5.2 MB. Max. memory is 8.0 GB. [2020-10-23 21:46:03,521 INFO L168 Benchmark]: TraceAbstraction took 15265.97 ms. Allocated memory was 155.2 MB in the beginning and 224.4 MB in the end (delta: 69.2 MB). Free memory was 121.3 MB in the beginning and 201.6 MB in the end (delta: -80.4 MB). Peak memory consumption was 117.8 MB. Max. memory is 8.0 GB. [2020-10-23 21:46:03,530 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.26 ms. Allocated memory is still 155.2 MB. Free memory is still 129.2 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 281.08 ms. Allocated memory is still 155.2 MB. Free memory was 112.2 MB in the beginning and 102.5 MB in the end (delta: 9.7 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 42.11 ms. Allocated memory is still 155.2 MB. Free memory was 102.5 MB in the beginning and 100.9 MB in the end (delta: 1.6 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * RCFGBuilder took 479.32 ms. Allocated memory is still 155.2 MB. Free memory was 100.9 MB in the beginning and 121.8 MB in the end (delta: -20.9 MB). Peak memory consumption was 5.2 MB. Max. memory is 8.0 GB. * TraceAbstraction took 15265.97 ms. Allocated memory was 155.2 MB in the beginning and 224.4 MB in the end (delta: 69.2 MB). Free memory was 121.3 MB in the beginning and 201.6 MB in the end (delta: -80.4 MB). Peak memory consumption was 117.8 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 3]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L16] int MAX = __VERIFIER_nondet_uint(); [L17] COND FALSE !(!(MAX > 0)) [L18] char str1[MAX], str2[MAX]; [L19] int cont, i, j; [L20] cont = 0 [L22] i=0 [L22] COND TRUE i= 0 [L30] EXPR str1[0] [L30] str2[j] = str1[0] [L31] j++ [L29] i-- [L29] COND TRUE i >= 0 [L30] EXPR str1[0] [L30] str2[j] = str1[0] [L31] j++ [L29] i-- [L29] COND FALSE !(i >= 0) [L34] j = MAX-1 [L35] i=0 [L35] COND TRUE i