/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -tc config/AutomizerReach.xml -s config/svcomp-Reach-64bit-Automizer_Default.epf -i ../sv-benchmarks/c/recursive/Ackermann01-2.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-4f750a8 [2020-12-22 06:58:03,990 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-12-22 06:58:03,993 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-12-22 06:58:04,052 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-12-22 06:58:04,052 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-12-22 06:58:04,057 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-12-22 06:58:04,060 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-12-22 06:58:04,069 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-12-22 06:58:04,072 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-12-22 06:58:04,076 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-12-22 06:58:04,078 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-12-22 06:58:04,079 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-12-22 06:58:04,080 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-12-22 06:58:04,087 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-12-22 06:58:04,089 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-12-22 06:58:04,092 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-12-22 06:58:04,094 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-12-22 06:58:04,097 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-12-22 06:58:04,105 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-12-22 06:58:04,111 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-12-22 06:58:04,113 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-12-22 06:58:04,115 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-12-22 06:58:04,117 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-12-22 06:58:04,120 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-12-22 06:58:04,132 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-12-22 06:58:04,146 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-12-22 06:58:04,148 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-12-22 06:58:04,149 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-12-22 06:58:04,150 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-64bit-Automizer_Default.epf [2020-12-22 06:58:04,205 INFO L113 SettingsManager]: Loading preferences was successful [2020-12-22 06:58:04,206 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-12-22 06:58:04,210 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-12-22 06:58:04,210 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-12-22 06:58:04,211 INFO L138 SettingsManager]: * Use SBE=true [2020-12-22 06:58:04,211 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-12-22 06:58:04,211 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-12-22 06:58:04,212 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-12-22 06:58:04,212 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-12-22 06:58:04,213 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-12-22 06:58:04,235 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-12-22 06:58:04,235 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-12-22 06:58:04,236 INFO L138 SettingsManager]: * Use constant arrays=true [2020-12-22 06:58:04,236 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-12-22 06:58:04,236 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-12-22 06:58:04,237 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-12-22 06:58:04,237 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-12-22 06:58:04,237 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-22 06:58:04,237 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-12-22 06:58:04,238 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-12-22 06:58:04,238 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-12-22 06:58:04,238 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-12-22 06:58:04,239 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-12-22 06:58:04,239 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-12-22 06:58:04,239 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-12-22 06:58:04,239 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2020-12-22 06:58:04,683 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-12-22 06:58:04,713 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-12-22 06:58:04,717 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-12-22 06:58:04,718 INFO L271 PluginConnector]: Initializing CDTParser... [2020-12-22 06:58:04,720 INFO L275 PluginConnector]: CDTParser initialized [2020-12-22 06:58:04,722 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/recursive/Ackermann01-2.c [2020-12-22 06:58:04,808 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/005cb405c/d86377da7c08483fa91df06d27f946f2/FLAG7b73f5d68 [2020-12-22 06:58:05,393 INFO L306 CDTParser]: Found 1 translation units. [2020-12-22 06:58:05,394 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/recursive/Ackermann01-2.c [2020-12-22 06:58:05,402 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/005cb405c/d86377da7c08483fa91df06d27f946f2/FLAG7b73f5d68 [2020-12-22 06:58:05,745 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/005cb405c/d86377da7c08483fa91df06d27f946f2 [2020-12-22 06:58:05,749 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-12-22 06:58:05,752 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-12-22 06:58:05,757 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-12-22 06:58:05,757 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-12-22 06:58:05,763 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-12-22 06:58:05,764 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.12 06:58:05" (1/1) ... [2020-12-22 06:58:05,766 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5ba0b6f5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 06:58:05, skipping insertion in model container [2020-12-22 06:58:05,766 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.12 06:58:05" (1/1) ... [2020-12-22 06:58:05,776 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-12-22 06:58:05,796 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-12-22 06:58:05,972 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/recursive/Ackermann01-2.c[1234,1247] [2020-12-22 06:58:05,976 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-22 06:58:05,989 INFO L203 MainTranslator]: Completed pre-run [2020-12-22 06:58:06,011 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/recursive/Ackermann01-2.c[1234,1247] [2020-12-22 06:58:06,012 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-22 06:58:06,031 INFO L208 MainTranslator]: Completed translation [2020-12-22 06:58:06,032 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 06:58:06 WrapperNode [2020-12-22 06:58:06,032 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-12-22 06:58:06,033 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-12-22 06:58:06,034 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-12-22 06:58:06,034 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-12-22 06:58:06,044 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 06:58:06" (1/1) ... [2020-12-22 06:58:06,052 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 06:58:06" (1/1) ... [2020-12-22 06:58:06,074 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-12-22 06:58:06,075 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-12-22 06:58:06,075 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-12-22 06:58:06,075 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-12-22 06:58:06,087 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 06:58:06" (1/1) ... [2020-12-22 06:58:06,088 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 06:58:06" (1/1) ... [2020-12-22 06:58:06,089 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 06:58:06" (1/1) ... [2020-12-22 06:58:06,090 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 06:58:06" (1/1) ... [2020-12-22 06:58:06,094 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 06:58:06" (1/1) ... [2020-12-22 06:58:06,096 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 06:58:06" (1/1) ... [2020-12-22 06:58:06,098 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 06:58:06" (1/1) ... [2020-12-22 06:58:06,100 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-12-22 06:58:06,101 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-12-22 06:58:06,101 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-12-22 06:58:06,101 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-12-22 06:58:06,102 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 06:58:06" (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 [2020-12-22 06:58:06,225 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-12-22 06:58:06,226 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-12-22 06:58:06,226 INFO L130 BoogieDeclarations]: Found specification of procedure ackermann [2020-12-22 06:58:06,226 INFO L138 BoogieDeclarations]: Found implementation of procedure ackermann [2020-12-22 06:58:06,226 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-12-22 06:58:06,226 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-12-22 06:58:06,511 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-12-22 06:58:06,511 INFO L299 CfgBuilder]: Removed 4 assume(true) statements. [2020-12-22 06:58:06,513 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.12 06:58:06 BoogieIcfgContainer [2020-12-22 06:58:06,513 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-12-22 06:58:06,515 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-12-22 06:58:06,515 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-12-22 06:58:06,519 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-12-22 06:58:06,519 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.12 06:58:05" (1/3) ... [2020-12-22 06:58:06,520 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@748c6cef and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.12 06:58:06, skipping insertion in model container [2020-12-22 06:58:06,520 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 06:58:06" (2/3) ... [2020-12-22 06:58:06,521 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@748c6cef and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.12 06:58:06, skipping insertion in model container [2020-12-22 06:58:06,521 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.12 06:58:06" (3/3) ... [2020-12-22 06:58:06,523 INFO L111 eAbstractionObserver]: Analyzing ICFG Ackermann01-2.c [2020-12-22 06:58:06,530 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-12-22 06:58:06,534 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-12-22 06:58:06,605 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-12-22 06:58:06,672 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-12-22 06:58:06,672 INFO L378 AbstractCegarLoop]: Hoare is true [2020-12-22 06:58:06,672 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-12-22 06:58:06,672 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-12-22 06:58:06,676 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-12-22 06:58:06,676 INFO L382 AbstractCegarLoop]: Difference is false [2020-12-22 06:58:06,676 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-12-22 06:58:06,677 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-12-22 06:58:06,694 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states. [2020-12-22 06:58:06,700 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-12-22 06:58:06,701 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 06:58:06,702 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 06:58:06,702 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 06:58:06,708 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 06:58:06,709 INFO L82 PathProgramCache]: Analyzing trace with hash 1470704041, now seen corresponding path program 1 times [2020-12-22 06:58:06,719 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 06:58:06,720 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [73190181] [2020-12-22 06:58:06,720 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 06:58:06,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:06,949 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2020-12-22 06:58:06,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:07,002 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-22 06:58:07,003 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [73190181] [2020-12-22 06:58:07,004 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-22 06:58:07,004 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2020-12-22 06:58:07,005 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1597712077] [2020-12-22 06:58:07,010 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-12-22 06:58:07,010 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 06:58:07,026 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-12-22 06:58:07,027 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-12-22 06:58:07,029 INFO L87 Difference]: Start difference. First operand 23 states. Second operand 7 states. [2020-12-22 06:58:07,243 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 06:58:07,243 INFO L93 Difference]: Finished difference Result 38 states and 46 transitions. [2020-12-22 06:58:07,247 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-12-22 06:58:07,248 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 12 [2020-12-22 06:58:07,249 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 06:58:07,269 INFO L225 Difference]: With dead ends: 38 [2020-12-22 06:58:07,269 INFO L226 Difference]: Without dead ends: 22 [2020-12-22 06:58:07,279 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2020-12-22 06:58:07,329 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-12-22 06:58:07,389 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2020-12-22 06:58:07,390 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-12-22 06:58:07,396 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 28 transitions. [2020-12-22 06:58:07,399 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 28 transitions. Word has length 12 [2020-12-22 06:58:07,399 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 06:58:07,400 INFO L481 AbstractCegarLoop]: Abstraction has 22 states and 28 transitions. [2020-12-22 06:58:07,400 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-12-22 06:58:07,400 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 28 transitions. [2020-12-22 06:58:07,405 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-12-22 06:58:07,405 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 06:58:07,410 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 06:58:07,411 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-12-22 06:58:07,411 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 06:58:07,412 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 06:58:07,412 INFO L82 PathProgramCache]: Analyzing trace with hash 941922339, now seen corresponding path program 1 times [2020-12-22 06:58:07,412 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 06:58:07,412 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1927458005] [2020-12-22 06:58:07,413 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 06:58:07,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:07,500 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2020-12-22 06:58:07,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:07,550 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-12-22 06:58:07,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:07,622 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-22 06:58:07,623 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1927458005] [2020-12-22 06:58:07,623 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-22 06:58:07,623 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-12-22 06:58:07,624 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1042388699] [2020-12-22 06:58:07,625 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-12-22 06:58:07,626 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 06:58:07,627 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-12-22 06:58:07,627 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-12-22 06:58:07,627 INFO L87 Difference]: Start difference. First operand 22 states and 28 transitions. Second operand 8 states. [2020-12-22 06:58:07,993 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 06:58:07,993 INFO L93 Difference]: Finished difference Result 29 states and 37 transitions. [2020-12-22 06:58:07,994 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-12-22 06:58:07,995 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 19 [2020-12-22 06:58:07,995 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 06:58:07,997 INFO L225 Difference]: With dead ends: 29 [2020-12-22 06:58:07,997 INFO L226 Difference]: Without dead ends: 25 [2020-12-22 06:58:07,998 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=80, Unknown=0, NotChecked=0, Total=110 [2020-12-22 06:58:07,999 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-12-22 06:58:08,006 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 23. [2020-12-22 06:58:08,007 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-12-22 06:58:08,008 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 29 transitions. [2020-12-22 06:58:08,009 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 29 transitions. Word has length 19 [2020-12-22 06:58:08,009 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 06:58:08,009 INFO L481 AbstractCegarLoop]: Abstraction has 23 states and 29 transitions. [2020-12-22 06:58:08,009 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-12-22 06:58:08,009 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 29 transitions. [2020-12-22 06:58:08,011 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-12-22 06:58:08,011 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 06:58:08,011 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 06:58:08,012 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-12-22 06:58:08,012 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 06:58:08,013 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 06:58:08,013 INFO L82 PathProgramCache]: Analyzing trace with hash -445405100, now seen corresponding path program 1 times [2020-12-22 06:58:08,013 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 06:58:08,014 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1261582063] [2020-12-22 06:58:08,014 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 06:58:08,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:08,065 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2020-12-22 06:58:08,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:08,089 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-12-22 06:58:08,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:08,117 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2020-12-22 06:58:08,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:08,128 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 5 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-12-22 06:58:08,129 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1261582063] [2020-12-22 06:58:08,129 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1972797301] [2020-12-22 06:58:08,130 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-22 06:58:08,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:08,224 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 6 conjunts are in the unsatisfiable core [2020-12-22 06:58:08,232 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-22 06:58:08,427 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-12-22 06:58:08,427 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-22 06:58:08,428 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 7] total 10 [2020-12-22 06:58:08,428 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1296972035] [2020-12-22 06:58:08,428 INFO L461 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-12-22 06:58:08,429 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 06:58:08,429 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-12-22 06:58:08,430 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2020-12-22 06:58:08,430 INFO L87 Difference]: Start difference. First operand 23 states and 29 transitions. Second operand 10 states. [2020-12-22 06:58:08,655 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 06:58:08,655 INFO L93 Difference]: Finished difference Result 48 states and 75 transitions. [2020-12-22 06:58:08,656 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-12-22 06:58:08,656 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 25 [2020-12-22 06:58:08,657 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 06:58:08,659 INFO L225 Difference]: With dead ends: 48 [2020-12-22 06:58:08,659 INFO L226 Difference]: Without dead ends: 30 [2020-12-22 06:58:08,660 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=52, Invalid=130, Unknown=0, NotChecked=0, Total=182 [2020-12-22 06:58:08,661 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-12-22 06:58:08,668 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 25. [2020-12-22 06:58:08,669 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-12-22 06:58:08,670 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 32 transitions. [2020-12-22 06:58:08,670 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 32 transitions. Word has length 25 [2020-12-22 06:58:08,671 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 06:58:08,671 INFO L481 AbstractCegarLoop]: Abstraction has 25 states and 32 transitions. [2020-12-22 06:58:08,671 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-12-22 06:58:08,671 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 32 transitions. [2020-12-22 06:58:08,676 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-12-22 06:58:08,676 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 06:58:08,676 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 06:58:08,891 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2020-12-22 06:58:08,892 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 06:58:08,893 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 06:58:08,894 INFO L82 PathProgramCache]: Analyzing trace with hash 1893657534, now seen corresponding path program 1 times [2020-12-22 06:58:08,894 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 06:58:08,895 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1358801425] [2020-12-22 06:58:08,895 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 06:58:08,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:08,958 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2020-12-22 06:58:08,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:09,019 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-12-22 06:58:09,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:09,067 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-12-22 06:58:09,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:09,135 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2020-12-22 06:58:09,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:09,197 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 13 proven. 4 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2020-12-22 06:58:09,197 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1358801425] [2020-12-22 06:58:09,198 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1761063207] [2020-12-22 06:58:09,198 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-22 06:58:09,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:09,299 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 14 conjunts are in the unsatisfiable core [2020-12-22 06:58:09,302 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-22 06:58:09,477 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 6 proven. 8 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-12-22 06:58:09,478 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-22 06:58:09,478 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 11] total 14 [2020-12-22 06:58:09,478 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [467758370] [2020-12-22 06:58:09,479 INFO L461 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-12-22 06:58:09,479 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 06:58:09,485 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-12-22 06:58:09,486 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=151, Unknown=0, NotChecked=0, Total=182 [2020-12-22 06:58:09,486 INFO L87 Difference]: Start difference. First operand 25 states and 32 transitions. Second operand 14 states. [2020-12-22 06:58:09,999 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 06:58:09,999 INFO L93 Difference]: Finished difference Result 51 states and 84 transitions. [2020-12-22 06:58:09,999 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-12-22 06:58:09,999 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 32 [2020-12-22 06:58:10,000 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 06:58:10,003 INFO L225 Difference]: With dead ends: 51 [2020-12-22 06:58:10,004 INFO L226 Difference]: Without dead ends: 47 [2020-12-22 06:58:10,005 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=124, Invalid=476, Unknown=0, NotChecked=0, Total=600 [2020-12-22 06:58:10,005 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-12-22 06:58:10,018 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 33. [2020-12-22 06:58:10,018 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-12-22 06:58:10,020 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 50 transitions. [2020-12-22 06:58:10,020 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 50 transitions. Word has length 32 [2020-12-22 06:58:10,020 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 06:58:10,023 INFO L481 AbstractCegarLoop]: Abstraction has 33 states and 50 transitions. [2020-12-22 06:58:10,023 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-12-22 06:58:10,023 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 50 transitions. [2020-12-22 06:58:10,025 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-12-22 06:58:10,025 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 06:58:10,026 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 06:58:10,240 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-22 06:58:10,241 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 06:58:10,242 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 06:58:10,242 INFO L82 PathProgramCache]: Analyzing trace with hash 1429337198, now seen corresponding path program 2 times [2020-12-22 06:58:10,243 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 06:58:10,243 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [253205201] [2020-12-22 06:58:10,244 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 06:58:10,263 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:10,303 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2020-12-22 06:58:10,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:10,373 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-12-22 06:58:10,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:10,438 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-12-22 06:58:10,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:10,478 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-12-22 06:58:10,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:10,561 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2020-12-22 06:58:10,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:10,599 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 20 proven. 6 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2020-12-22 06:58:10,599 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [253205201] [2020-12-22 06:58:10,600 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1730462339] [2020-12-22 06:58:10,600 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-22 06:58:10,660 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-22 06:58:10,660 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-22 06:58:10,662 INFO L263 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 16 conjunts are in the unsatisfiable core [2020-12-22 06:58:10,665 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-22 06:58:10,767 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 11 proven. 12 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2020-12-22 06:58:10,767 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-22 06:58:10,768 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12] total 15 [2020-12-22 06:58:10,768 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2094468015] [2020-12-22 06:58:10,768 INFO L461 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-12-22 06:58:10,769 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 06:58:10,769 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-12-22 06:58:10,769 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=176, Unknown=0, NotChecked=0, Total=210 [2020-12-22 06:58:10,770 INFO L87 Difference]: Start difference. First operand 33 states and 50 transitions. Second operand 15 states. [2020-12-22 06:58:11,278 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 06:58:11,279 INFO L93 Difference]: Finished difference Result 62 states and 113 transitions. [2020-12-22 06:58:11,284 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-12-22 06:58:11,284 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 39 [2020-12-22 06:58:11,287 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 06:58:11,296 INFO L225 Difference]: With dead ends: 62 [2020-12-22 06:58:11,296 INFO L226 Difference]: Without dead ends: 58 [2020-12-22 06:58:11,299 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=137, Invalid=565, Unknown=0, NotChecked=0, Total=702 [2020-12-22 06:58:11,300 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-12-22 06:58:11,327 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 31. [2020-12-22 06:58:11,327 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-12-22 06:58:11,328 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 44 transitions. [2020-12-22 06:58:11,329 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 44 transitions. Word has length 39 [2020-12-22 06:58:11,332 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 06:58:11,345 INFO L481 AbstractCegarLoop]: Abstraction has 31 states and 44 transitions. [2020-12-22 06:58:11,345 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-12-22 06:58:11,346 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 44 transitions. [2020-12-22 06:58:11,351 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-12-22 06:58:11,351 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 06:58:11,351 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 06:58:11,551 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-22 06:58:11,552 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 06:58:11,553 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 06:58:11,553 INFO L82 PathProgramCache]: Analyzing trace with hash -1137182642, now seen corresponding path program 3 times [2020-12-22 06:58:11,554 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 06:58:11,554 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [862596363] [2020-12-22 06:58:11,555 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 06:58:11,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:11,584 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2020-12-22 06:58:11,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:11,612 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-12-22 06:58:11,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:11,634 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-12-22 06:58:11,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:11,646 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2020-12-22 06:58:11,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:11,665 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-12-22 06:58:11,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:11,675 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 16 proven. 9 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2020-12-22 06:58:11,675 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [862596363] [2020-12-22 06:58:11,675 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [78740718] [2020-12-22 06:58:11,676 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-22 06:58:11,729 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2020-12-22 06:58:11,730 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-22 06:58:11,731 INFO L263 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 10 conjunts are in the unsatisfiable core [2020-12-22 06:58:11,733 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-22 06:58:11,871 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 17 proven. 4 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2020-12-22 06:58:11,872 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-22 06:58:11,872 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 14 [2020-12-22 06:58:11,872 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1088598918] [2020-12-22 06:58:11,873 INFO L461 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-12-22 06:58:11,873 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 06:58:11,874 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-12-22 06:58:11,874 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=156, Unknown=0, NotChecked=0, Total=182 [2020-12-22 06:58:11,874 INFO L87 Difference]: Start difference. First operand 31 states and 44 transitions. Second operand 14 states. [2020-12-22 06:58:12,315 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 06:58:12,315 INFO L93 Difference]: Finished difference Result 78 states and 135 transitions. [2020-12-22 06:58:12,316 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-12-22 06:58:12,316 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 39 [2020-12-22 06:58:12,316 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 06:58:12,318 INFO L225 Difference]: With dead ends: 78 [2020-12-22 06:58:12,318 INFO L226 Difference]: Without dead ends: 50 [2020-12-22 06:58:12,320 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=111, Invalid=441, Unknown=0, NotChecked=0, Total=552 [2020-12-22 06:58:12,320 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-12-22 06:58:12,330 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2020-12-22 06:58:12,330 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-12-22 06:58:12,332 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 78 transitions. [2020-12-22 06:58:12,332 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 78 transitions. Word has length 39 [2020-12-22 06:58:12,333 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 06:58:12,333 INFO L481 AbstractCegarLoop]: Abstraction has 50 states and 78 transitions. [2020-12-22 06:58:12,333 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-12-22 06:58:12,333 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 78 transitions. [2020-12-22 06:58:12,353 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2020-12-22 06:58:12,353 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 06:58:12,354 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 5, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 06:58:12,568 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-22 06:58:12,569 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 06:58:12,570 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 06:58:12,570 INFO L82 PathProgramCache]: Analyzing trace with hash 985301155, now seen corresponding path program 4 times [2020-12-22 06:58:12,571 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 06:58:12,571 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1116860952] [2020-12-22 06:58:12,571 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 06:58:12,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:12,609 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2020-12-22 06:58:12,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:12,636 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-12-22 06:58:12,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:12,658 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-12-22 06:58:12,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:12,666 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-12-22 06:58:12,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:12,679 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-12-22 06:58:12,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:12,684 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-12-22 06:58:12,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:12,690 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-12-22 06:58:12,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:12,694 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 43 [2020-12-22 06:58:12,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:12,704 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 32 proven. 22 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2020-12-22 06:58:12,704 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1116860952] [2020-12-22 06:58:12,705 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [671133712] [2020-12-22 06:58:12,705 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-22 06:58:12,763 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-22 06:58:12,764 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-22 06:58:12,765 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 3 conjunts are in the unsatisfiable core [2020-12-22 06:58:12,768 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-22 06:58:12,842 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 71 proven. 1 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2020-12-22 06:58:12,843 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-22 06:58:12,843 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 6 [2020-12-22 06:58:12,843 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [893525293] [2020-12-22 06:58:12,844 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-12-22 06:58:12,844 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 06:58:12,845 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-12-22 06:58:12,845 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-12-22 06:58:12,845 INFO L87 Difference]: Start difference. First operand 50 states and 78 transitions. Second operand 6 states. [2020-12-22 06:58:12,910 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 06:58:12,910 INFO L93 Difference]: Finished difference Result 98 states and 185 transitions. [2020-12-22 06:58:12,910 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-12-22 06:58:12,910 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 59 [2020-12-22 06:58:12,911 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 06:58:12,912 INFO L225 Difference]: With dead ends: 98 [2020-12-22 06:58:12,912 INFO L226 Difference]: Without dead ends: 53 [2020-12-22 06:58:12,914 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 76 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-12-22 06:58:12,915 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-12-22 06:58:12,925 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2020-12-22 06:58:12,925 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-12-22 06:58:12,927 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 84 transitions. [2020-12-22 06:58:12,927 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 84 transitions. Word has length 59 [2020-12-22 06:58:12,927 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 06:58:12,927 INFO L481 AbstractCegarLoop]: Abstraction has 53 states and 84 transitions. [2020-12-22 06:58:12,927 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-12-22 06:58:12,928 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 84 transitions. [2020-12-22 06:58:12,930 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2020-12-22 06:58:12,930 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 06:58:12,930 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 6, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 06:58:13,144 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2020-12-22 06:58:13,145 INFO L429 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 06:58:13,145 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 06:58:13,146 INFO L82 PathProgramCache]: Analyzing trace with hash -1971944696, now seen corresponding path program 5 times [2020-12-22 06:58:13,147 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 06:58:13,147 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [83365301] [2020-12-22 06:58:13,147 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 06:58:13,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:13,227 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2020-12-22 06:58:13,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:13,274 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-12-22 06:58:13,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:13,321 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-12-22 06:58:13,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:13,347 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-12-22 06:58:13,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:13,377 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-12-22 06:58:13,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:13,402 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-12-22 06:58:13,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:13,414 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2020-12-22 06:58:13,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:13,420 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 36 [2020-12-22 06:58:13,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:13,435 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-12-22 06:58:13,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:13,441 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 56 [2020-12-22 06:58:13,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:13,460 INFO L134 CoverageAnalysis]: Checked inductivity of 213 backedges. 63 proven. 63 refuted. 0 times theorem prover too weak. 87 trivial. 0 not checked. [2020-12-22 06:58:13,461 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [83365301] [2020-12-22 06:58:13,461 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [920606443] [2020-12-22 06:58:13,461 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-22 06:58:13,551 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2020-12-22 06:58:13,551 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-22 06:58:13,553 INFO L263 TraceCheckSpWp]: Trace formula consists of 150 conjuncts, 17 conjunts are in the unsatisfiable core [2020-12-22 06:58:13,573 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-22 06:58:13,819 INFO L134 CoverageAnalysis]: Checked inductivity of 213 backedges. 97 proven. 37 refuted. 0 times theorem prover too weak. 79 trivial. 0 not checked. [2020-12-22 06:58:13,819 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-22 06:58:13,819 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 12] total 19 [2020-12-22 06:58:13,820 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1150475698] [2020-12-22 06:58:13,820 INFO L461 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-12-22 06:58:13,820 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 06:58:13,821 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-12-22 06:58:13,821 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=296, Unknown=0, NotChecked=0, Total=342 [2020-12-22 06:58:13,822 INFO L87 Difference]: Start difference. First operand 53 states and 84 transitions. Second operand 19 states. [2020-12-22 06:58:14,514 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 06:58:14,514 INFO L93 Difference]: Finished difference Result 86 states and 171 transitions. [2020-12-22 06:58:14,519 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-12-22 06:58:14,519 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 72 [2020-12-22 06:58:14,519 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 06:58:14,519 INFO L225 Difference]: With dead ends: 86 [2020-12-22 06:58:14,520 INFO L226 Difference]: Without dead ends: 0 [2020-12-22 06:58:14,521 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 88 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 221 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=245, Invalid=1015, Unknown=0, NotChecked=0, Total=1260 [2020-12-22 06:58:14,522 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-12-22 06:58:14,522 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-12-22 06:58:14,522 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-12-22 06:58:14,522 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-12-22 06:58:14,522 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 72 [2020-12-22 06:58:14,522 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 06:58:14,522 INFO L481 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-12-22 06:58:14,522 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-12-22 06:58:14,523 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-12-22 06:58:14,523 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-12-22 06:58:14,723 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-22 06:58:14,727 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-12-22 06:58:15,188 INFO L189 CegarLoopUtils]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-12-22 06:58:15,189 INFO L189 CegarLoopUtils]: For program point L-1(line -1) no Hoare annotation was computed. [2020-12-22 06:58:15,189 INFO L189 CegarLoopUtils]: For program point L30(lines 30 34) no Hoare annotation was computed. [2020-12-22 06:58:15,189 INFO L189 CegarLoopUtils]: For program point ULTIMATE.startENTRY(line -1) no Hoare annotation was computed. [2020-12-22 06:58:15,189 INFO L189 CegarLoopUtils]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-12-22 06:58:15,189 INFO L192 CegarLoopUtils]: At program point L28(lines 28 48) the Hoare annotation is: true [2020-12-22 06:58:15,189 INFO L189 CegarLoopUtils]: For program point ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION(line 46) no Hoare annotation was computed. [2020-12-22 06:58:15,189 INFO L189 CegarLoopUtils]: For program point L46(line 46) no Hoare annotation was computed. [2020-12-22 06:58:15,190 INFO L189 CegarLoopUtils]: For program point L43(lines 43 47) no Hoare annotation was computed. [2020-12-22 06:58:15,190 INFO L185 CegarLoopUtils]: At program point L42(line 42) the Hoare annotation is: (<= 0 ULTIMATE.start_main_~n~0) [2020-12-22 06:58:15,190 INFO L189 CegarLoopUtils]: For program point L42-1(line 42) no Hoare annotation was computed. [2020-12-22 06:58:15,190 INFO L189 CegarLoopUtils]: For program point L36(lines 36 41) no Hoare annotation was computed. [2020-12-22 06:58:15,190 INFO L189 CegarLoopUtils]: For program point ackermannEXIT(lines 17 25) no Hoare annotation was computed. [2020-12-22 06:58:15,190 INFO L185 CegarLoopUtils]: At program point L24(line 24) the Hoare annotation is: (and (= ackermann_~m |ackermann_#in~m|) (= ackermann_~n |ackermann_#in~n|) (not (= |ackermann_#in~m| 0))) [2020-12-22 06:58:15,190 INFO L189 CegarLoopUtils]: For program point L24-1(line 24) no Hoare annotation was computed. [2020-12-22 06:58:15,190 INFO L185 CegarLoopUtils]: At program point L22(line 22) the Hoare annotation is: (and (= |ackermann_#in~n| 0) (= ackermann_~m |ackermann_#in~m|) (= ackermann_~n |ackermann_#in~n|) (not (= |ackermann_#in~m| 0))) [2020-12-22 06:58:15,191 INFO L185 CegarLoopUtils]: At program point L24-2(line 24) the Hoare annotation is: (let ((.cse0 (<= 1 |ackermann_#in~m|)) (.cse1 (= ackermann_~m |ackermann_#in~m|)) (.cse2 (= ackermann_~n |ackermann_#in~n|))) (or (and (<= 2 |ackermann_#t~ret8|) (<= ackermann_~m 1) .cse0 .cse1 .cse2) (and (<= 3 |ackermann_#t~ret8|) .cse0 .cse1 .cse2))) [2020-12-22 06:58:15,191 INFO L192 CegarLoopUtils]: At program point ackermannENTRY(lines 17 25) the Hoare annotation is: true [2020-12-22 06:58:15,191 INFO L189 CegarLoopUtils]: For program point L21(lines 21 23) no Hoare annotation was computed. [2020-12-22 06:58:15,191 INFO L189 CegarLoopUtils]: For program point L22-1(line 22) no Hoare annotation was computed. [2020-12-22 06:58:15,191 INFO L189 CegarLoopUtils]: For program point L24-3(line 24) no Hoare annotation was computed. [2020-12-22 06:58:15,191 INFO L189 CegarLoopUtils]: For program point L18(lines 18 20) no Hoare annotation was computed. [2020-12-22 06:58:15,192 INFO L189 CegarLoopUtils]: For program point ackermannFINAL(lines 17 25) no Hoare annotation was computed. [2020-12-22 06:58:15,204 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 22.12 06:58:15 BoogieIcfgContainer [2020-12-22 06:58:15,204 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-12-22 06:58:15,205 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-12-22 06:58:15,205 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-12-22 06:58:15,205 INFO L275 PluginConnector]: Witness Printer initialized [2020-12-22 06:58:15,206 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.12 06:58:06" (3/4) ... [2020-12-22 06:58:15,209 INFO L137 WitnessPrinter]: Generating witness for correct program [2020-12-22 06:58:15,217 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure ackermann [2020-12-22 06:58:15,221 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 9 nodes and edges [2020-12-22 06:58:15,222 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 5 nodes and edges [2020-12-22 06:58:15,222 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2020-12-22 06:58:15,222 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2020-12-22 06:58:15,266 INFO L141 WitnessManager]: Wrote witness to /storage/repos/svcomp/c/recursive/Ackermann01-2.c-witness.graphml [2020-12-22 06:58:15,266 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-12-22 06:58:15,268 INFO L168 Benchmark]: Toolchain (without parser) took 9516.04 ms. Allocated memory was 151.0 MB in the beginning and 229.6 MB in the end (delta: 78.6 MB). Free memory was 127.1 MB in the beginning and 134.5 MB in the end (delta: -7.4 MB). Peak memory consumption was 71.5 MB. Max. memory is 8.0 GB. [2020-12-22 06:58:15,269 INFO L168 Benchmark]: CDTParser took 0.24 ms. Allocated memory is still 151.0 MB. Free memory is still 127.4 MB. There was no memory consumed. Max. memory is 8.0 GB. [2020-12-22 06:58:15,270 INFO L168 Benchmark]: CACSL2BoogieTranslator took 275.37 ms. Allocated memory is still 151.0 MB. Free memory was 126.9 MB in the beginning and 117.5 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. [2020-12-22 06:58:15,270 INFO L168 Benchmark]: Boogie Procedure Inliner took 40.74 ms. Allocated memory is still 151.0 MB. Free memory was 117.5 MB in the beginning and 116.0 MB in the end (delta: 1.5 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2020-12-22 06:58:15,271 INFO L168 Benchmark]: Boogie Preprocessor took 25.11 ms. Allocated memory is still 151.0 MB. Free memory was 116.0 MB in the beginning and 115.0 MB in the end (delta: 967.9 kB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2020-12-22 06:58:15,272 INFO L168 Benchmark]: RCFGBuilder took 412.27 ms. Allocated memory is still 151.0 MB. Free memory was 115.0 MB in the beginning and 102.2 MB in the end (delta: 12.8 MB). Peak memory consumption was 12.6 MB. Max. memory is 8.0 GB. [2020-12-22 06:58:15,276 INFO L168 Benchmark]: TraceAbstraction took 8689.13 ms. Allocated memory was 151.0 MB in the beginning and 229.6 MB in the end (delta: 78.6 MB). Free memory was 101.7 MB in the beginning and 137.1 MB in the end (delta: -35.4 MB). Peak memory consumption was 44.2 MB. Max. memory is 8.0 GB. [2020-12-22 06:58:15,276 INFO L168 Benchmark]: Witness Printer took 61.74 ms. Allocated memory is still 229.6 MB. Free memory was 137.1 MB in the beginning and 134.5 MB in the end (delta: 2.6 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. [2020-12-22 06:58:15,280 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.24 ms. Allocated memory is still 151.0 MB. Free memory is still 127.4 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 275.37 ms. Allocated memory is still 151.0 MB. Free memory was 126.9 MB in the beginning and 117.5 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. * Boogie Procedure Inliner took 40.74 ms. Allocated memory is still 151.0 MB. Free memory was 117.5 MB in the beginning and 116.0 MB in the end (delta: 1.5 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 25.11 ms. Allocated memory is still 151.0 MB. Free memory was 116.0 MB in the beginning and 115.0 MB in the end (delta: 967.9 kB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * RCFGBuilder took 412.27 ms. Allocated memory is still 151.0 MB. Free memory was 115.0 MB in the beginning and 102.2 MB in the end (delta: 12.8 MB). Peak memory consumption was 12.6 MB. Max. memory is 8.0 GB. * TraceAbstraction took 8689.13 ms. Allocated memory was 151.0 MB in the beginning and 229.6 MB in the end (delta: 78.6 MB). Free memory was 101.7 MB in the beginning and 137.1 MB in the end (delta: -35.4 MB). Peak memory consumption was 44.2 MB. Max. memory is 8.0 GB. * Witness Printer took 61.74 ms. Allocated memory is still 229.6 MB. Free memory was 137.1 MB in the beginning and 134.5 MB in the end (delta: 2.6 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 46]: call to reach_error is unreachable For all program executions holds that call to reach_error is unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 28]: Loop Invariant Derived loop invariant: 1 - StatisticsResult: Ultimate Automizer benchmark data CFG has 2 procedures, 23 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 8.0s, OverallIterations: 8, TraceHistogramMax: 10, AutomataDifference: 3.1s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.4s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 149 SDtfs, 196 SDslu, 634 SDs, 0 SdLazy, 1558 SolverSat, 302 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.3s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 475 GetRequests, 337 SyntacticMatches, 0 SemanticMatches, 138 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 410 ImplicationChecksByTransitivity, 1.9s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=53occurred in iteration=7, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 8 MinimizatonAttempts, 48 StatesRemovedByMinimization, 4 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 6 LocationsWithAnnotation, 110 PreInvPairs, 136 NumberOfFragments, 60 HoareAnnotationTreeSize, 110 FomulaSimplifications, 6992 FormulaSimplificationTreeSizeReduction, 0.2s HoareSimplificationTime, 6 FomulaSimplificationsInter, 290 FormulaSimplificationTreeSizeReductionInter, 0.1s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 0.3s SatisfiabilityAnalysisTime, 2.4s InterpolantComputationTime, 563 NumberOfCodeBlocks, 517 NumberOfCodeBlocksAsserted, 22 NumberOfCheckSat, 549 ConstructedInterpolants, 0 QuantifiedInterpolants, 48425 SizeOfPredicates, 16 NumberOfNonLiveVariables, 771 ConjunctsInSsa, 66 ConjunctsInUnsatCore, 14 InterpolantComputations, 2 PerfectInterpolantSequences, 776/948 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...