/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/loop-simple/deep-nested.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-bitabs-dcfa08f [2020-12-23 07:14:11,175 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-12-23 07:14:11,178 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-12-23 07:14:11,228 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-12-23 07:14:11,229 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-12-23 07:14:11,234 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-12-23 07:14:11,238 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-12-23 07:14:11,244 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-12-23 07:14:11,248 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-12-23 07:14:11,255 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-12-23 07:14:11,259 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-12-23 07:14:11,261 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-12-23 07:14:11,262 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-12-23 07:14:11,267 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-12-23 07:14:11,270 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-12-23 07:14:11,272 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-12-23 07:14:11,286 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-12-23 07:14:11,287 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-12-23 07:14:11,292 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-12-23 07:14:11,297 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-12-23 07:14:11,299 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-12-23 07:14:11,302 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-12-23 07:14:11,304 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-12-23 07:14:11,306 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-12-23 07:14:11,316 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-12-23 07:14:11,335 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-12-23 07:14:11,337 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-12-23 07:14:11,338 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-12-23 07:14:11,341 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-64bit-Automizer_Default.epf [2020-12-23 07:14:11,393 INFO L113 SettingsManager]: Loading preferences was successful [2020-12-23 07:14:11,393 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-12-23 07:14:11,398 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-12-23 07:14:11,398 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-12-23 07:14:11,398 INFO L138 SettingsManager]: * Use SBE=true [2020-12-23 07:14:11,399 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-12-23 07:14:11,399 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-12-23 07:14:11,399 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-12-23 07:14:11,399 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-12-23 07:14:11,399 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-12-23 07:14:11,401 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-12-23 07:14:11,401 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-12-23 07:14:11,401 INFO L138 SettingsManager]: * Use constant arrays=true [2020-12-23 07:14:11,402 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-12-23 07:14:11,402 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-12-23 07:14:11,402 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-12-23 07:14:11,402 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-12-23 07:14:11,403 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-23 07:14:11,403 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-12-23 07:14:11,403 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-12-23 07:14:11,403 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-12-23 07:14:11,403 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-12-23 07:14:11,404 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-12-23 07:14:11,404 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-12-23 07:14:11,404 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-12-23 07:14:11,404 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-bitabs/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2020-12-23 07:14:11,846 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-12-23 07:14:11,888 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-12-23 07:14:11,892 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-12-23 07:14:11,893 INFO L271 PluginConnector]: Initializing CDTParser... [2020-12-23 07:14:11,894 INFO L275 PluginConnector]: CDTParser initialized [2020-12-23 07:14:11,895 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/loop-simple/deep-nested.c [2020-12-23 07:14:11,984 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/7cdd73a6f/a9df9ae19f644821871b03e70b01ea37/FLAG1ed2855b5 [2020-12-23 07:14:12,673 INFO L306 CDTParser]: Found 1 translation units. [2020-12-23 07:14:12,674 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-bitabs/releaseScripts/default/sv-benchmarks/c/loop-simple/deep-nested.c [2020-12-23 07:14:12,684 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/7cdd73a6f/a9df9ae19f644821871b03e70b01ea37/FLAG1ed2855b5 [2020-12-23 07:14:13,017 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/7cdd73a6f/a9df9ae19f644821871b03e70b01ea37 [2020-12-23 07:14:13,020 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-12-23 07:14:13,022 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-12-23 07:14:13,024 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-12-23 07:14:13,024 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-12-23 07:14:13,028 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-12-23 07:14:13,029 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.12 07:14:13" (1/1) ... [2020-12-23 07:14:13,030 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@317cdc83 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 07:14:13, skipping insertion in model container [2020-12-23 07:14:13,030 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.12 07:14:13" (1/1) ... [2020-12-23 07:14:13,039 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-12-23 07:14:13,054 INFO L178 MainTranslator]: Built tables and reachable declarations left hand side expression in assignment: lhs: VariableLHS[~uint32_max~0,] left hand side expression in assignment: lhs: VariableLHS[~a~0,] left hand side expression in assignment: lhs: VariableLHS[~b~0,] left hand side expression in assignment: lhs: VariableLHS[~c~0,] left hand side expression in assignment: lhs: VariableLHS[~d~0,] left hand side expression in assignment: lhs: VariableLHS[~e~0,] [2020-12-23 07:14:13,250 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate-bitabs/releaseScripts/default/sv-benchmarks/c/loop-simple/deep-nested.c[625,638] [2020-12-23 07:14:13,260 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-23 07:14:13,270 INFO L203 MainTranslator]: Completed pre-run left hand side expression in assignment: lhs: VariableLHS[~uint32_max~0,] left hand side expression in assignment: lhs: VariableLHS[~a~0,] left hand side expression in assignment: lhs: VariableLHS[~b~0,] left hand side expression in assignment: lhs: VariableLHS[~c~0,] left hand side expression in assignment: lhs: VariableLHS[~d~0,] left hand side expression in assignment: lhs: VariableLHS[~e~0,] [2020-12-23 07:14:13,305 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate-bitabs/releaseScripts/default/sv-benchmarks/c/loop-simple/deep-nested.c[625,638] [2020-12-23 07:14:13,313 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-23 07:14:13,333 INFO L208 MainTranslator]: Completed translation [2020-12-23 07:14:13,334 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 07:14:13 WrapperNode [2020-12-23 07:14:13,334 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-12-23 07:14:13,336 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-12-23 07:14:13,337 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-12-23 07:14:13,337 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-12-23 07:14:13,345 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 07:14:13" (1/1) ... [2020-12-23 07:14:13,358 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 07:14:13" (1/1) ... [2020-12-23 07:14:13,387 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-12-23 07:14:13,391 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-12-23 07:14:13,391 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-12-23 07:14:13,391 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-12-23 07:14:13,401 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 07:14:13" (1/1) ... [2020-12-23 07:14:13,401 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 07:14:13" (1/1) ... [2020-12-23 07:14:13,412 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 07:14:13" (1/1) ... [2020-12-23 07:14:13,412 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 07:14:13" (1/1) ... [2020-12-23 07:14:13,422 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 07:14:13" (1/1) ... [2020-12-23 07:14:13,433 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 07:14:13" (1/1) ... [2020-12-23 07:14:13,435 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 07:14:13" (1/1) ... [2020-12-23 07:14:13,442 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-12-23 07:14:13,443 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-12-23 07:14:13,444 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-12-23 07:14:13,444 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-12-23 07:14:13,446 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 07:14:13" (1/1) ... No working directory specified, using /storage/repos/ultimate-bitabs/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 [2020-12-23 07:14:13,541 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-12-23 07:14:13,542 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-12-23 07:14:13,542 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-12-23 07:14:13,542 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-12-23 07:14:13,849 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-12-23 07:14:13,849 INFO L299 CfgBuilder]: Removed 9 assume(true) statements. [2020-12-23 07:14:13,871 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.12 07:14:13 BoogieIcfgContainer [2020-12-23 07:14:13,871 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-12-23 07:14:13,873 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-12-23 07:14:13,873 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-12-23 07:14:13,876 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-12-23 07:14:13,877 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.12 07:14:13" (1/3) ... [2020-12-23 07:14:13,877 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@71669ef2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.12 07:14:13, skipping insertion in model container [2020-12-23 07:14:13,878 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 07:14:13" (2/3) ... [2020-12-23 07:14:13,878 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@71669ef2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.12 07:14:13, skipping insertion in model container [2020-12-23 07:14:13,878 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.12 07:14:13" (3/3) ... [2020-12-23 07:14:13,886 INFO L111 eAbstractionObserver]: Analyzing ICFG deep-nested.c [2020-12-23 07:14:13,896 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-12-23 07:14:13,902 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-12-23 07:14:13,930 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-12-23 07:14:13,986 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-12-23 07:14:13,986 INFO L378 AbstractCegarLoop]: Hoare is true [2020-12-23 07:14:13,987 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-12-23 07:14:13,987 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-12-23 07:14:13,987 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-12-23 07:14:13,987 INFO L382 AbstractCegarLoop]: Difference is false [2020-12-23 07:14:13,987 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-12-23 07:14:13,988 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-12-23 07:14:14,015 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states. [2020-12-23 07:14:14,037 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2020-12-23 07:14:14,040 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 07:14:14,041 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 07:14:14,042 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 07:14:14,055 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 07:14:14,056 INFO L82 PathProgramCache]: Analyzing trace with hash -180366952, now seen corresponding path program 1 times [2020-12-23 07:14:14,066 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 07:14:14,066 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [211433469] [2020-12-23 07:14:14,067 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 07:14:14,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 07:14:14,534 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 07:14:14,535 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [211433469] [2020-12-23 07:14:14,536 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-23 07:14:14,537 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-12-23 07:14:14,538 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1180039595] [2020-12-23 07:14:14,543 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-12-23 07:14:14,544 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 07:14:14,560 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-12-23 07:14:14,561 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-12-23 07:14:14,564 INFO L87 Difference]: Start difference. First operand 19 states. Second operand 4 states. [2020-12-23 07:14:14,668 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 07:14:14,668 INFO L93 Difference]: Finished difference Result 39 states and 62 transitions. [2020-12-23 07:14:14,669 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-12-23 07:14:14,671 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 9 [2020-12-23 07:14:14,671 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 07:14:14,681 INFO L225 Difference]: With dead ends: 39 [2020-12-23 07:14:14,681 INFO L226 Difference]: Without dead ends: 18 [2020-12-23 07:14:14,685 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-12-23 07:14:14,707 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-12-23 07:14:14,726 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 17. [2020-12-23 07:14:14,728 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-12-23 07:14:14,729 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 21 transitions. [2020-12-23 07:14:14,731 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 21 transitions. Word has length 9 [2020-12-23 07:14:14,731 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 07:14:14,732 INFO L481 AbstractCegarLoop]: Abstraction has 17 states and 21 transitions. [2020-12-23 07:14:14,732 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-12-23 07:14:14,732 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 21 transitions. [2020-12-23 07:14:14,733 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-12-23 07:14:14,733 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 07:14:14,733 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 07:14:14,733 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-12-23 07:14:14,734 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 07:14:14,735 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 07:14:14,735 INFO L82 PathProgramCache]: Analyzing trace with hash -303894894, now seen corresponding path program 1 times [2020-12-23 07:14:14,735 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 07:14:14,736 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [966934895] [2020-12-23 07:14:14,736 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 07:14:14,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 07:14:14,933 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 07:14:14,934 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [966934895] [2020-12-23 07:14:14,935 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [175438879] [2020-12-23 07:14:14,935 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate-bitabs/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 [2020-12-23 07:14:14,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 07:14:14,998 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 12 conjunts are in the unsatisfiable core [2020-12-23 07:14:15,004 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 07:14:15,100 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-12-23 07:14:15,101 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2020-12-23 07:14:15,101 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [5] total 7 [2020-12-23 07:14:15,102 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2142592511] [2020-12-23 07:14:15,103 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-12-23 07:14:15,104 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 07:14:15,105 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-12-23 07:14:15,105 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2020-12-23 07:14:15,105 INFO L87 Difference]: Start difference. First operand 17 states and 21 transitions. Second operand 4 states. [2020-12-23 07:14:15,170 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 07:14:15,170 INFO L93 Difference]: Finished difference Result 43 states and 56 transitions. [2020-12-23 07:14:15,171 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-12-23 07:14:15,171 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 12 [2020-12-23 07:14:15,171 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 07:14:15,172 INFO L225 Difference]: With dead ends: 43 [2020-12-23 07:14:15,172 INFO L226 Difference]: Without dead ends: 28 [2020-12-23 07:14:15,174 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 11 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2020-12-23 07:14:15,174 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-12-23 07:14:15,180 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2020-12-23 07:14:15,181 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-12-23 07:14:15,182 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 33 transitions. [2020-12-23 07:14:15,182 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 33 transitions. Word has length 12 [2020-12-23 07:14:15,182 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 07:14:15,183 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 33 transitions. [2020-12-23 07:14:15,183 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-12-23 07:14:15,183 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 33 transitions. [2020-12-23 07:14:15,184 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-12-23 07:14:15,184 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 07:14:15,184 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 07:14:15,397 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2020-12-23 07:14:15,398 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 07:14:15,399 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 07:14:15,400 INFO L82 PathProgramCache]: Analyzing trace with hash -551222553, now seen corresponding path program 1 times [2020-12-23 07:14:15,401 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 07:14:15,401 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [383757125] [2020-12-23 07:14:15,401 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 07:14:15,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 07:14:15,699 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-23 07:14:15,700 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [383757125] [2020-12-23 07:14:15,700 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1736761149] [2020-12-23 07:14:15,701 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate-bitabs/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 [2020-12-23 07:14:15,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 07:14:15,765 INFO L263 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 8 conjunts are in the unsatisfiable core [2020-12-23 07:14:15,768 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 07:14:15,831 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-12-23 07:14:15,835 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 07:14:15,835 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 9 [2020-12-23 07:14:15,836 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [479944139] [2020-12-23 07:14:15,836 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-12-23 07:14:15,838 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 07:14:15,840 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-12-23 07:14:15,840 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2020-12-23 07:14:15,841 INFO L87 Difference]: Start difference. First operand 26 states and 33 transitions. Second operand 9 states. [2020-12-23 07:14:16,662 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 07:14:16,662 INFO L93 Difference]: Finished difference Result 165 states and 219 transitions. [2020-12-23 07:14:16,663 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-12-23 07:14:16,663 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 15 [2020-12-23 07:14:16,663 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 07:14:16,665 INFO L225 Difference]: With dead ends: 165 [2020-12-23 07:14:16,666 INFO L226 Difference]: Without dead ends: 105 [2020-12-23 07:14:16,668 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 182 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=208, Invalid=548, Unknown=0, NotChecked=0, Total=756 [2020-12-23 07:14:16,669 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2020-12-23 07:14:16,682 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 59. [2020-12-23 07:14:16,682 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-12-23 07:14:16,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 69 transitions. [2020-12-23 07:14:16,684 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 69 transitions. Word has length 15 [2020-12-23 07:14:16,684 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 07:14:16,685 INFO L481 AbstractCegarLoop]: Abstraction has 59 states and 69 transitions. [2020-12-23 07:14:16,685 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-12-23 07:14:16,685 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 69 transitions. [2020-12-23 07:14:16,687 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-12-23 07:14:16,687 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 07:14:16,687 INFO L422 BasicCegarLoop]: trace histogram [11, 10, 10, 4, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 07:14:16,901 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 07:14:16,902 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 07:14:16,903 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 07:14:16,904 INFO L82 PathProgramCache]: Analyzing trace with hash 1803019380, now seen corresponding path program 1 times [2020-12-23 07:14:16,904 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 07:14:16,905 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1239508350] [2020-12-23 07:14:16,905 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 07:14:17,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 07:14:17,430 INFO L134 CoverageAnalysis]: Checked inductivity of 217 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 217 trivial. 0 not checked. [2020-12-23 07:14:17,430 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1239508350] [2020-12-23 07:14:17,431 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-23 07:14:17,431 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-12-23 07:14:17,431 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1519747391] [2020-12-23 07:14:17,431 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-12-23 07:14:17,432 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 07:14:17,432 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-12-23 07:14:17,433 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-12-23 07:14:17,433 INFO L87 Difference]: Start difference. First operand 59 states and 69 transitions. Second operand 4 states. [2020-12-23 07:14:17,506 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 07:14:17,506 INFO L93 Difference]: Finished difference Result 116 states and 136 transitions. [2020-12-23 07:14:17,507 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-23 07:14:17,507 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 57 [2020-12-23 07:14:17,507 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 07:14:17,509 INFO L225 Difference]: With dead ends: 116 [2020-12-23 07:14:17,509 INFO L226 Difference]: Without dead ends: 114 [2020-12-23 07:14:17,509 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-12-23 07:14:17,510 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2020-12-23 07:14:17,522 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 79. [2020-12-23 07:14:17,523 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-12-23 07:14:17,524 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 93 transitions. [2020-12-23 07:14:17,524 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 93 transitions. Word has length 57 [2020-12-23 07:14:17,525 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 07:14:17,525 INFO L481 AbstractCegarLoop]: Abstraction has 79 states and 93 transitions. [2020-12-23 07:14:17,525 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-12-23 07:14:17,525 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 93 transitions. [2020-12-23 07:14:17,527 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-12-23 07:14:17,527 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 07:14:17,528 INFO L422 BasicCegarLoop]: trace histogram [14, 13, 13, 5, 4, 4, 4, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2020-12-23 07:14:17,528 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-12-23 07:14:17,528 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 07:14:17,529 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 07:14:17,529 INFO L82 PathProgramCache]: Analyzing trace with hash -1183690726, now seen corresponding path program 1 times [2020-12-23 07:14:17,529 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 07:14:17,529 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [246109058] [2020-12-23 07:14:17,530 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 07:14:17,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 07:14:17,994 INFO L134 CoverageAnalysis]: Checked inductivity of 382 backedges. 16 proven. 141 refuted. 0 times theorem prover too weak. 225 trivial. 0 not checked. [2020-12-23 07:14:17,994 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [246109058] [2020-12-23 07:14:17,995 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [983113226] [2020-12-23 07:14:17,995 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate-bitabs/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 [2020-12-23 07:14:18,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 07:14:18,074 INFO L263 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 10 conjunts are in the unsatisfiable core [2020-12-23 07:14:18,078 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 07:14:18,274 INFO L134 CoverageAnalysis]: Checked inductivity of 382 backedges. 149 proven. 2 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2020-12-23 07:14:18,274 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 07:14:18,274 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7] total 14 [2020-12-23 07:14:18,275 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [583380184] [2020-12-23 07:14:18,275 INFO L461 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-12-23 07:14:18,276 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 07:14:18,276 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-12-23 07:14:18,277 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2020-12-23 07:14:18,277 INFO L87 Difference]: Start difference. First operand 79 states and 93 transitions. Second operand 14 states. [2020-12-23 07:14:21,043 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 07:14:21,043 INFO L93 Difference]: Finished difference Result 369 states and 468 transitions. [2020-12-23 07:14:21,044 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-12-23 07:14:21,044 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 78 [2020-12-23 07:14:21,044 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 07:14:21,046 INFO L225 Difference]: With dead ends: 369 [2020-12-23 07:14:21,046 INFO L226 Difference]: Without dead ends: 190 [2020-12-23 07:14:21,049 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 75 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 682 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=508, Invalid=1942, Unknown=0, NotChecked=0, Total=2450 [2020-12-23 07:14:21,050 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 190 states. [2020-12-23 07:14:21,075 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 190 to 121. [2020-12-23 07:14:21,075 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 121 states. [2020-12-23 07:14:21,076 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 138 transitions. [2020-12-23 07:14:21,077 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 138 transitions. Word has length 78 [2020-12-23 07:14:21,077 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 07:14:21,077 INFO L481 AbstractCegarLoop]: Abstraction has 121 states and 138 transitions. [2020-12-23 07:14:21,077 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-12-23 07:14:21,077 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 138 transitions. [2020-12-23 07:14:21,079 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2020-12-23 07:14:21,080 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 07:14:21,080 INFO L422 BasicCegarLoop]: trace histogram [25, 24, 24, 6, 5, 5, 5, 4, 4, 4, 3, 3, 2, 1, 1, 1, 1, 1, 1] [2020-12-23 07:14:21,293 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 07:14:21,294 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 07:14:21,295 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 07:14:21,295 INFO L82 PathProgramCache]: Analyzing trace with hash 1268793673, now seen corresponding path program 2 times [2020-12-23 07:14:21,295 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 07:14:21,296 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [871741801] [2020-12-23 07:14:21,296 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 07:14:21,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 07:14:21,910 INFO L134 CoverageAnalysis]: Checked inductivity of 1114 backedges. 21 proven. 331 refuted. 0 times theorem prover too weak. 762 trivial. 0 not checked. [2020-12-23 07:14:21,911 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [871741801] [2020-12-23 07:14:21,912 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1047967069] [2020-12-23 07:14:21,912 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/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 [2020-12-23 07:14:22,012 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-23 07:14:22,012 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 07:14:22,014 INFO L263 TraceCheckSpWp]: Trace formula consists of 233 conjuncts, 10 conjunts are in the unsatisfiable core [2020-12-23 07:14:22,019 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 07:14:22,242 INFO L134 CoverageAnalysis]: Checked inductivity of 1114 backedges. 321 proven. 14 refuted. 0 times theorem prover too weak. 779 trivial. 0 not checked. [2020-12-23 07:14:22,242 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 07:14:22,242 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 7] total 15 [2020-12-23 07:14:22,243 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [602974046] [2020-12-23 07:14:22,243 INFO L461 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-12-23 07:14:22,244 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 07:14:22,244 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-12-23 07:14:22,245 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2020-12-23 07:14:22,245 INFO L87 Difference]: Start difference. First operand 121 states and 138 transitions. Second operand 15 states. [2020-12-23 07:14:23,793 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 07:14:23,794 INFO L93 Difference]: Finished difference Result 499 states and 587 transitions. [2020-12-23 07:14:23,795 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-12-23 07:14:23,802 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 120 [2020-12-23 07:14:23,802 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 07:14:23,804 INFO L225 Difference]: With dead ends: 499 [2020-12-23 07:14:23,805 INFO L226 Difference]: Without dead ends: 357 [2020-12-23 07:14:23,810 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 117 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 258 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=222, Invalid=968, Unknown=0, NotChecked=0, Total=1190 [2020-12-23 07:14:23,811 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 357 states. [2020-12-23 07:14:23,868 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 357 to 259. [2020-12-23 07:14:23,868 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 259 states. [2020-12-23 07:14:23,872 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 259 states to 259 states and 281 transitions. [2020-12-23 07:14:23,873 INFO L78 Accepts]: Start accepts. Automaton has 259 states and 281 transitions. Word has length 120 [2020-12-23 07:14:23,874 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 07:14:23,874 INFO L481 AbstractCegarLoop]: Abstraction has 259 states and 281 transitions. [2020-12-23 07:14:23,875 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-12-23 07:14:23,875 INFO L276 IsEmpty]: Start isEmpty. Operand 259 states and 281 transitions. [2020-12-23 07:14:23,886 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 259 [2020-12-23 07:14:23,887 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 07:14:23,890 INFO L422 BasicCegarLoop]: trace histogram [66, 65, 65, 11, 10, 10, 5, 4, 4, 4, 3, 3, 2, 1, 1, 1, 1, 1, 1] [2020-12-23 07:14:24,090 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 07:14:24,091 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 07:14:24,092 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 07:14:24,093 INFO L82 PathProgramCache]: Analyzing trace with hash 321231152, now seen corresponding path program 3 times [2020-12-23 07:14:24,093 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 07:14:24,094 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1426600288] [2020-12-23 07:14:24,094 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 07:14:24,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 07:14:25,437 INFO L134 CoverageAnalysis]: Checked inductivity of 7273 backedges. 26 proven. 1307 refuted. 0 times theorem prover too weak. 5940 trivial. 0 not checked. [2020-12-23 07:14:25,437 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1426600288] [2020-12-23 07:14:25,438 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1021595373] [2020-12-23 07:14:25,438 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate-bitabs/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 [2020-12-23 07:14:25,523 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2020-12-23 07:14:25,523 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 07:14:25,524 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 12 conjunts are in the unsatisfiable core [2020-12-23 07:14:25,552 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 07:14:26,028 INFO L134 CoverageAnalysis]: Checked inductivity of 7273 backedges. 3645 proven. 714 refuted. 0 times theorem prover too weak. 2914 trivial. 0 not checked. [2020-12-23 07:14:26,029 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 07:14:26,029 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 5] total 15 [2020-12-23 07:14:26,030 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1145187601] [2020-12-23 07:14:26,031 INFO L461 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-12-23 07:14:26,035 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 07:14:26,036 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-12-23 07:14:26,037 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-12-23 07:14:26,038 INFO L87 Difference]: Start difference. First operand 259 states and 281 transitions. Second operand 15 states. [2020-12-23 07:14:27,588 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 07:14:27,589 INFO L93 Difference]: Finished difference Result 1215 states and 1356 transitions. [2020-12-23 07:14:27,590 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-12-23 07:14:27,590 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 258 [2020-12-23 07:14:27,590 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 07:14:27,595 INFO L225 Difference]: With dead ends: 1215 [2020-12-23 07:14:27,595 INFO L226 Difference]: Without dead ends: 961 [2020-12-23 07:14:27,597 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 294 GetRequests, 257 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 292 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=301, Invalid=1181, Unknown=0, NotChecked=0, Total=1482 [2020-12-23 07:14:27,599 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 961 states. [2020-12-23 07:14:27,660 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 961 to 556. [2020-12-23 07:14:27,660 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 556 states. [2020-12-23 07:14:27,662 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 556 states to 556 states and 590 transitions. [2020-12-23 07:14:27,663 INFO L78 Accepts]: Start accepts. Automaton has 556 states and 590 transitions. Word has length 258 [2020-12-23 07:14:27,663 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 07:14:27,663 INFO L481 AbstractCegarLoop]: Abstraction has 556 states and 590 transitions. [2020-12-23 07:14:27,663 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-12-23 07:14:27,663 INFO L276 IsEmpty]: Start isEmpty. Operand 556 states and 590 transitions. [2020-12-23 07:14:27,675 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 556 [2020-12-23 07:14:27,675 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 07:14:27,675 INFO L422 BasicCegarLoop]: trace histogram [153, 152, 152, 19, 18, 18, 9, 8, 8, 4, 3, 3, 2, 1, 1, 1, 1, 1, 1] [2020-12-23 07:14:27,890 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2020-12-23 07:14:27,891 INFO L429 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 07:14:27,892 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 07:14:27,892 INFO L82 PathProgramCache]: Analyzing trace with hash -1910016454, now seen corresponding path program 4 times [2020-12-23 07:14:27,893 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 07:14:27,894 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [283678965] [2020-12-23 07:14:27,894 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 07:14:29,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 07:14:31,728 INFO L134 CoverageAnalysis]: Checked inductivity of 38251 backedges. 42 proven. 4006 refuted. 0 times theorem prover too weak. 34203 trivial. 0 not checked. [2020-12-23 07:14:31,729 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [283678965] [2020-12-23 07:14:31,729 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [991132955] [2020-12-23 07:14:31,729 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate-bitabs/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 [2020-12-23 07:14:31,984 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-23 07:14:31,985 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 07:14:31,991 INFO L263 TraceCheckSpWp]: Trace formula consists of 847 conjuncts, 14 conjunts are in the unsatisfiable core [2020-12-23 07:14:32,004 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 07:14:32,978 INFO L134 CoverageAnalysis]: Checked inductivity of 38251 backedges. 22506 proven. 791 refuted. 0 times theorem prover too weak. 14954 trivial. 0 not checked. [2020-12-23 07:14:32,979 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 07:14:32,979 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 9] total 21 [2020-12-23 07:14:32,979 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1263927099] [2020-12-23 07:14:32,980 INFO L461 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-12-23 07:14:32,980 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 07:14:32,981 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-12-23 07:14:32,981 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=360, Unknown=0, NotChecked=0, Total=420 [2020-12-23 07:14:32,981 INFO L87 Difference]: Start difference. First operand 556 states and 590 transitions. Second operand 21 states. [2020-12-23 07:14:37,187 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 07:14:37,187 INFO L93 Difference]: Finished difference Result 1820 states and 1990 transitions. [2020-12-23 07:14:37,188 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2020-12-23 07:14:37,188 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 555 [2020-12-23 07:14:37,189 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 07:14:37,195 INFO L225 Difference]: With dead ends: 1820 [2020-12-23 07:14:37,195 INFO L226 Difference]: Without dead ends: 1295 [2020-12-23 07:14:37,199 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 615 GetRequests, 552 SyntacticMatches, 0 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 966 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=611, Invalid=3549, Unknown=0, NotChecked=0, Total=4160 [2020-12-23 07:14:37,200 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1295 states. [2020-12-23 07:14:37,309 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1295 to 967. [2020-12-23 07:14:37,309 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 967 states. [2020-12-23 07:14:37,313 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 967 states to 967 states and 1010 transitions. [2020-12-23 07:14:37,313 INFO L78 Accepts]: Start accepts. Automaton has 967 states and 1010 transitions. Word has length 555 [2020-12-23 07:14:37,313 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 07:14:37,314 INFO L481 AbstractCegarLoop]: Abstraction has 967 states and 1010 transitions. [2020-12-23 07:14:37,314 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-12-23 07:14:37,314 INFO L276 IsEmpty]: Start isEmpty. Operand 967 states and 1010 transitions. [2020-12-23 07:14:37,354 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 967 [2020-12-23 07:14:37,354 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 07:14:37,355 INFO L422 BasicCegarLoop]: trace histogram [281, 280, 280, 28, 27, 27, 9, 8, 8, 4, 3, 3, 2, 1, 1, 1, 1, 1, 1] [2020-12-23 07:14:37,569 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 07:14:37,570 INFO L429 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 07:14:37,571 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 07:14:37,571 INFO L82 PathProgramCache]: Analyzing trace with hash -739452119, now seen corresponding path program 5 times [2020-12-23 07:14:37,572 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 07:14:37,572 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [533947458] [2020-12-23 07:14:37,572 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 07:14:40,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 07:14:44,567 INFO L134 CoverageAnalysis]: Checked inductivity of 126767 backedges. 51 proven. 9092 refuted. 0 times theorem prover too weak. 117624 trivial. 0 not checked. [2020-12-23 07:14:44,567 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [533947458] [2020-12-23 07:14:44,568 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [516797307] [2020-12-23 07:14:44,568 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 07:15:03,533 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 43 check-sat command(s) [2020-12-23 07:15:03,533 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 07:15:03,546 INFO L263 TraceCheckSpWp]: Trace formula consists of 244 conjuncts, 35 conjunts are in the unsatisfiable core [2020-12-23 07:15:03,557 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 07:15:05,697 INFO L134 CoverageAnalysis]: Checked inductivity of 126767 backedges. 45728 proven. 1117 refuted. 0 times theorem prover too weak. 79922 trivial. 0 not checked. [2020-12-23 07:15:05,697 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 07:15:05,698 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 21] total 35 [2020-12-23 07:15:05,701 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1578791489] [2020-12-23 07:15:05,704 INFO L461 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-12-23 07:15:05,705 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 07:15:05,706 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-12-23 07:15:05,706 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=1084, Unknown=0, NotChecked=0, Total=1190 [2020-12-23 07:15:05,707 INFO L87 Difference]: Start difference. First operand 967 states and 1010 transitions. Second operand 35 states. [2020-12-23 07:15:08,785 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 07:15:08,785 INFO L93 Difference]: Finished difference Result 2141 states and 2279 transitions. [2020-12-23 07:15:08,786 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-12-23 07:15:08,786 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 966 [2020-12-23 07:15:08,789 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 07:15:08,797 INFO L225 Difference]: With dead ends: 2141 [2020-12-23 07:15:08,798 INFO L226 Difference]: Without dead ends: 1133 [2020-12-23 07:15:08,801 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 1010 GetRequests, 950 SyntacticMatches, 0 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 881 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=346, Invalid=3436, Unknown=0, NotChecked=0, Total=3782 [2020-12-23 07:15:08,802 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1133 states. [2020-12-23 07:15:08,907 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1133 to 1078. [2020-12-23 07:15:08,907 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1078 states. [2020-12-23 07:15:08,911 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1078 states to 1078 states and 1121 transitions. [2020-12-23 07:15:08,911 INFO L78 Accepts]: Start accepts. Automaton has 1078 states and 1121 transitions. Word has length 966 [2020-12-23 07:15:08,911 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 07:15:08,912 INFO L481 AbstractCegarLoop]: Abstraction has 1078 states and 1121 transitions. [2020-12-23 07:15:08,912 INFO L482 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-12-23 07:15:08,912 INFO L276 IsEmpty]: Start isEmpty. Operand 1078 states and 1121 transitions. [2020-12-23 07:15:08,923 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1078 [2020-12-23 07:15:08,924 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 07:15:08,924 INFO L422 BasicCegarLoop]: trace histogram [318, 317, 317, 28, 27, 27, 9, 8, 8, 4, 3, 3, 2, 1, 1, 1, 1, 1, 1] [2020-12-23 07:15:09,135 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 07:15:09,135 INFO L429 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 07:15:09,136 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 07:15:09,137 INFO L82 PathProgramCache]: Analyzing trace with hash 168509327, now seen corresponding path program 6 times [2020-12-23 07:15:09,137 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 07:15:09,137 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [57161984] [2020-12-23 07:15:09,138 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 07:15:10,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 07:15:16,268 INFO L134 CoverageAnalysis]: Checked inductivity of 160918 backedges. 51 proven. 12163 refuted. 0 times theorem prover too weak. 148704 trivial. 0 not checked. [2020-12-23 07:15:16,273 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [57161984] [2020-12-23 07:15:16,273 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1150286599] [2020-12-23 07:15:16,273 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 07:15:16,424 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2020-12-23 07:15:16,424 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 07:15:16,425 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 16 conjunts are in the unsatisfiable core [2020-12-23 07:15:16,439 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 07:15:17,743 INFO L757 QuantifierPusher]: Run 10 iterations of DualJunctionQuantifierElimination maybe there is a nontermination bug. [2020-12-23 07:15:19,527 INFO L134 CoverageAnalysis]: Checked inductivity of 160918 backedges. 0 proven. 79085 refuted. 0 times theorem prover too weak. 81833 trivial. 0 not checked. [2020-12-23 07:15:19,527 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 07:15:19,528 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 4] total 20 [2020-12-23 07:15:19,528 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1982839692] [2020-12-23 07:15:19,530 INFO L461 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-12-23 07:15:19,530 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 07:15:19,531 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-12-23 07:15:19,532 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=316, Unknown=0, NotChecked=0, Total=380 [2020-12-23 07:15:19,532 INFO L87 Difference]: Start difference. First operand 1078 states and 1121 transitions. Second operand 20 states. [2020-12-23 07:15:23,535 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 07:15:23,535 INFO L93 Difference]: Finished difference Result 3190 states and 3423 transitions. [2020-12-23 07:15:23,536 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-12-23 07:15:23,536 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 1077 [2020-12-23 07:15:23,536 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 07:15:23,546 INFO L225 Difference]: With dead ends: 3190 [2020-12-23 07:15:23,547 INFO L226 Difference]: Without dead ends: 2081 [2020-12-23 07:15:23,552 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 1138 GetRequests, 1077 SyntacticMatches, 0 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 927 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=460, Invalid=3446, Unknown=0, NotChecked=0, Total=3906 [2020-12-23 07:15:23,555 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2081 states. [2020-12-23 07:15:23,724 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2081 to 1537. [2020-12-23 07:15:23,724 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1537 states. [2020-12-23 07:15:23,728 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1537 states to 1537 states and 1590 transitions. [2020-12-23 07:15:23,729 INFO L78 Accepts]: Start accepts. Automaton has 1537 states and 1590 transitions. Word has length 1077 [2020-12-23 07:15:23,729 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 07:15:23,729 INFO L481 AbstractCegarLoop]: Abstraction has 1537 states and 1590 transitions. [2020-12-23 07:15:23,729 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-12-23 07:15:23,729 INFO L276 IsEmpty]: Start isEmpty. Operand 1537 states and 1590 transitions. [2020-12-23 07:15:23,751 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1537 [2020-12-23 07:15:23,752 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 07:15:23,752 INFO L422 BasicCegarLoop]: trace histogram [461, 460, 460, 34, 33, 33, 11, 10, 10, 5, 4, 4, 3, 2, 2, 1, 1, 1, 1] [2020-12-23 07:15:23,953 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2020-12-23 07:15:23,954 INFO L429 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 07:15:23,955 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 07:15:23,955 INFO L82 PathProgramCache]: Analyzing trace with hash -1919369601, now seen corresponding path program 7 times [2020-12-23 07:15:23,959 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 07:15:23,959 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [532224281] [2020-12-23 07:15:23,959 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 07:15:27,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 07:15:37,187 INFO L134 CoverageAnalysis]: Checked inductivity of 335026 backedges. 65 proven. 20420 refuted. 0 times theorem prover too weak. 314541 trivial. 0 not checked. [2020-12-23 07:15:37,188 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [532224281] [2020-12-23 07:15:37,188 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [894792125] [2020-12-23 07:15:37,188 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 07:15:37,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 07:15:37,879 INFO L263 TraceCheckSpWp]: Trace formula consists of 2193 conjuncts, 14 conjunts are in the unsatisfiable core [2020-12-23 07:15:37,902 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 07:15:41,087 INFO L134 CoverageAnalysis]: Checked inductivity of 335026 backedges. 100125 proven. 5873 refuted. 0 times theorem prover too weak. 229028 trivial. 0 not checked. [2020-12-23 07:15:41,088 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 07:15:41,088 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 9] total 27 [2020-12-23 07:15:41,088 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [678553879] [2020-12-23 07:15:41,090 INFO L461 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-12-23 07:15:41,090 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 07:15:41,091 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-12-23 07:15:41,091 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=618, Unknown=0, NotChecked=0, Total=702 [2020-12-23 07:15:41,092 INFO L87 Difference]: Start difference. First operand 1537 states and 1590 transitions. Second operand 27 states. [2020-12-23 07:15:50,483 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 07:15:50,483 INFO L93 Difference]: Finished difference Result 4874 states and 5179 transitions. [2020-12-23 07:15:50,484 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2020-12-23 07:15:50,484 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 1536 [2020-12-23 07:15:50,484 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 07:15:50,501 INFO L225 Difference]: With dead ends: 4874 [2020-12-23 07:15:50,501 INFO L226 Difference]: Without dead ends: 3314 [2020-12-23 07:15:50,509 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 1624 GetRequests, 1531 SyntacticMatches, 0 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2580 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=785, Invalid=8145, Unknown=0, NotChecked=0, Total=8930 [2020-12-23 07:15:50,514 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3314 states. [2020-12-23 07:15:50,869 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3314 to 3137. [2020-12-23 07:15:50,870 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3137 states. [2020-12-23 07:15:50,877 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3137 states to 3137 states and 3226 transitions. [2020-12-23 07:15:50,878 INFO L78 Accepts]: Start accepts. Automaton has 3137 states and 3226 transitions. Word has length 1536 [2020-12-23 07:15:50,879 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 07:15:50,880 INFO L481 AbstractCegarLoop]: Abstraction has 3137 states and 3226 transitions. [2020-12-23 07:15:50,880 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-12-23 07:15:50,880 INFO L276 IsEmpty]: Start isEmpty. Operand 3137 states and 3226 transitions. [2020-12-23 07:15:50,941 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2557 [2020-12-23 07:15:50,942 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 07:15:50,943 INFO L422 BasicCegarLoop]: trace histogram [781, 780, 780, 49, 48, 48, 16, 15, 15, 5, 4, 4, 3, 2, 2, 1, 1, 1, 1] [2020-12-23 07:15:51,156 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 07:15:51,157 INFO L429 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 07:15:51,158 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 07:15:51,159 INFO L82 PathProgramCache]: Analyzing trace with hash -1908048211, now seen corresponding path program 8 times [2020-12-23 07:15:51,159 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 07:15:51,159 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1439327502] [2020-12-23 07:15:51,159 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 07:15:59,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 07:16:24,160 INFO L134 CoverageAnalysis]: Checked inductivity of 955076 backedges. 90 proven. 39408 refuted. 0 times theorem prover too weak. 915578 trivial. 0 not checked. [2020-12-23 07:16:24,160 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1439327502] [2020-12-23 07:16:24,160 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1715804919] [2020-12-23 07:16:24,161 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 07:16:25,296 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-23 07:16:25,297 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 07:16:25,315 INFO L263 TraceCheckSpWp]: Trace formula consists of 3593 conjuncts, 14 conjunts are in the unsatisfiable core [2020-12-23 07:16:25,350 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 07:16:34,763 INFO L134 CoverageAnalysis]: Checked inductivity of 955076 backedges. 445400 proven. 66158 refuted. 0 times theorem prover too weak. 443518 trivial. 0 not checked. [2020-12-23 07:16:34,763 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 07:16:34,764 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 9] total 29 [2020-12-23 07:16:34,764 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [906659988] [2020-12-23 07:16:34,766 INFO L461 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-12-23 07:16:34,766 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 07:16:34,767 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-12-23 07:16:34,767 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=720, Unknown=0, NotChecked=0, Total=812 [2020-12-23 07:16:34,767 INFO L87 Difference]: Start difference. First operand 3137 states and 3226 transitions. Second operand 29 states. [2020-12-23 07:16:47,422 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 07:16:47,423 INFO L93 Difference]: Finished difference Result 11937 states and 12573 transitions. [2020-12-23 07:16:47,424 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 79 states. [2020-12-23 07:16:47,424 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 2556 [2020-12-23 07:16:47,424 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 07:16:47,463 INFO L225 Difference]: With dead ends: 11937 [2020-12-23 07:16:47,463 INFO L226 Difference]: Without dead ends: 8721 [2020-12-23 07:16:47,476 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 2654 GetRequests, 2551 SyntacticMatches, 0 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3188 ImplicationChecksByTransitivity, 8.0s TimeCoverageRelationStatistics Valid=881, Invalid=10039, Unknown=0, NotChecked=0, Total=10920 [2020-12-23 07:16:47,489 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8721 states. [2020-12-23 07:16:48,124 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8721 to 6441. [2020-12-23 07:16:48,125 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6441 states. [2020-12-23 07:16:48,138 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6441 states to 6441 states and 6605 transitions. [2020-12-23 07:16:48,139 INFO L78 Accepts]: Start accepts. Automaton has 6441 states and 6605 transitions. Word has length 2556 [2020-12-23 07:16:48,139 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 07:16:48,139 INFO L481 AbstractCegarLoop]: Abstraction has 6441 states and 6605 transitions. [2020-12-23 07:16:48,139 INFO L482 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-12-23 07:16:48,140 INFO L276 IsEmpty]: Start isEmpty. Operand 6441 states and 6605 transitions. [2020-12-23 07:16:48,440 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5449 [2020-12-23 07:16:48,441 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 07:16:48,443 INFO L422 BasicCegarLoop]: trace histogram [1680, 1679, 1679, 94, 93, 93, 31, 30, 30, 10, 9, 9, 3, 2, 2, 1, 1, 1, 1] [2020-12-23 07:16:48,655 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 07:16:48,656 INFO L429 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 07:16:48,657 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 07:16:48,658 INFO L82 PathProgramCache]: Analyzing trace with hash -1075215870, now seen corresponding path program 9 times [2020-12-23 07:16:48,658 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 07:16:48,658 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1755377042] [2020-12-23 07:16:48,659 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 07:17:28,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat