./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/eca-rers2012/Problem12_label19.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version e19ca921 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx15G -Xms4m -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/AutomizerReach.xml -i ../sv-benchmarks/c/eca-rers2012/Problem12_label19.c -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 8fb9a44013f129b42a7ee402f5ad064de240b9b8bfc3efdb0ecb991ba7dde0d1 --- Real Ultimate output --- This is Ultimate 0.2.2-dev-e19ca92 [2021-12-22 09:16:26,001 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-12-22 09:16:26,004 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-12-22 09:16:26,055 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-12-22 09:16:26,056 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-12-22 09:16:26,057 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-12-22 09:16:26,058 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-12-22 09:16:26,059 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-12-22 09:16:26,060 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-12-22 09:16:26,061 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-12-22 09:16:26,061 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-12-22 09:16:26,062 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-12-22 09:16:26,062 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-12-22 09:16:26,063 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-12-22 09:16:26,064 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-12-22 09:16:26,065 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-12-22 09:16:26,065 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-12-22 09:16:26,066 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-12-22 09:16:26,067 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-12-22 09:16:26,068 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-12-22 09:16:26,069 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-12-22 09:16:26,069 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-12-22 09:16:26,070 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-12-22 09:16:26,071 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-12-22 09:16:26,072 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-12-22 09:16:26,072 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-12-22 09:16:26,073 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-12-22 09:16:26,073 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-12-22 09:16:26,074 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-12-22 09:16:26,074 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-12-22 09:16:26,074 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-12-22 09:16:26,075 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-12-22 09:16:26,075 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-12-22 09:16:26,076 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-12-22 09:16:26,076 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-12-22 09:16:26,077 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-12-22 09:16:26,077 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-12-22 09:16:26,077 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-12-22 09:16:26,078 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-12-22 09:16:26,078 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-12-22 09:16:26,079 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-12-22 09:16:26,079 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2021-12-22 09:16:26,093 INFO L113 SettingsManager]: Loading preferences was successful [2021-12-22 09:16:26,093 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-12-22 09:16:26,093 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-12-22 09:16:26,093 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-12-22 09:16:26,094 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-12-22 09:16:26,094 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-12-22 09:16:26,095 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-12-22 09:16:26,095 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-12-22 09:16:26,095 INFO L138 SettingsManager]: * Use SBE=true [2021-12-22 09:16:26,095 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-12-22 09:16:26,095 INFO L138 SettingsManager]: * sizeof long=4 [2021-12-22 09:16:26,095 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-12-22 09:16:26,096 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-12-22 09:16:26,096 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-12-22 09:16:26,096 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-12-22 09:16:26,096 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-12-22 09:16:26,096 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-12-22 09:16:26,096 INFO L138 SettingsManager]: * sizeof long double=12 [2021-12-22 09:16:26,097 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-12-22 09:16:26,097 INFO L138 SettingsManager]: * Use constant arrays=true [2021-12-22 09:16:26,097 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-12-22 09:16:26,097 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-12-22 09:16:26,097 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-12-22 09:16:26,097 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-12-22 09:16:26,098 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-22 09:16:26,098 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-12-22 09:16:26,098 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-12-22 09:16:26,098 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-12-22 09:16:26,098 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-12-22 09:16:26,098 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-12-22 09:16:26,098 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-12-22 09:16:26,099 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-12-22 09:16:26,099 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-12-22 09:16:26,099 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-12-22 09:16:26,099 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 8fb9a44013f129b42a7ee402f5ad064de240b9b8bfc3efdb0ecb991ba7dde0d1 [2021-12-22 09:16:26,292 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-12-22 09:16:26,313 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-12-22 09:16:26,315 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-12-22 09:16:26,316 INFO L271 PluginConnector]: Initializing CDTParser... [2021-12-22 09:16:26,317 INFO L275 PluginConnector]: CDTParser initialized [2021-12-22 09:16:26,318 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/eca-rers2012/Problem12_label19.c [2021-12-22 09:16:26,360 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7f3e9ecc7/de110b7b3cdb4c41aeb461774c5f05b9/FLAG9c4b09076 [2021-12-22 09:16:26,858 INFO L306 CDTParser]: Found 1 translation units. [2021-12-22 09:16:26,859 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/eca-rers2012/Problem12_label19.c [2021-12-22 09:16:26,887 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7f3e9ecc7/de110b7b3cdb4c41aeb461774c5f05b9/FLAG9c4b09076 [2021-12-22 09:16:27,119 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7f3e9ecc7/de110b7b3cdb4c41aeb461774c5f05b9 [2021-12-22 09:16:27,123 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-12-22 09:16:27,125 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-12-22 09:16:27,125 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-12-22 09:16:27,126 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-12-22 09:16:27,128 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-12-22 09:16:27,129 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.12 09:16:27" (1/1) ... [2021-12-22 09:16:27,129 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4ba68c53 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 09:16:27, skipping insertion in model container [2021-12-22 09:16:27,130 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.12 09:16:27" (1/1) ... [2021-12-22 09:16:27,134 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-12-22 09:16:27,215 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-12-22 09:16:27,388 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/eca-rers2012/Problem12_label19.c[2130,2143] [2021-12-22 09:16:27,887 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-22 09:16:27,896 INFO L203 MainTranslator]: Completed pre-run [2021-12-22 09:16:27,916 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/eca-rers2012/Problem12_label19.c[2130,2143] [2021-12-22 09:16:28,229 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-22 09:16:28,245 INFO L208 MainTranslator]: Completed translation [2021-12-22 09:16:28,245 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 09:16:28 WrapperNode [2021-12-22 09:16:28,246 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-12-22 09:16:28,247 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-12-22 09:16:28,247 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-12-22 09:16:28,247 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-12-22 09:16:28,252 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 09:16:28" (1/1) ... [2021-12-22 09:16:28,292 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 09:16:28" (1/1) ... [2021-12-22 09:16:28,522 INFO L137 Inliner]: procedures = 17, calls = 11, calls flagged for inlining = 6, calls inlined = 6, statements flattened = 4757 [2021-12-22 09:16:28,523 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-12-22 09:16:28,523 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-12-22 09:16:28,524 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-12-22 09:16:28,524 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-12-22 09:16:28,535 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 09:16:28" (1/1) ... [2021-12-22 09:16:28,535 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 09:16:28" (1/1) ... [2021-12-22 09:16:28,619 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 09:16:28" (1/1) ... [2021-12-22 09:16:28,627 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 09:16:28" (1/1) ... [2021-12-22 09:16:28,735 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 09:16:28" (1/1) ... [2021-12-22 09:16:28,759 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 09:16:28" (1/1) ... [2021-12-22 09:16:28,776 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 09:16:28" (1/1) ... [2021-12-22 09:16:28,809 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-12-22 09:16:28,811 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-12-22 09:16:28,811 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-12-22 09:16:28,811 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-12-22 09:16:28,812 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 09:16:28" (1/1) ... [2021-12-22 09:16:28,817 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-22 09:16:28,824 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 09:16:28,835 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-12-22 09:16:28,855 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-12-22 09:16:28,863 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-12-22 09:16:28,863 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-12-22 09:16:28,863 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-12-22 09:16:28,864 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-12-22 09:16:28,908 INFO L234 CfgBuilder]: Building ICFG [2021-12-22 09:16:28,909 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2021-12-22 09:16:31,751 INFO L275 CfgBuilder]: Performing block encoding [2021-12-22 09:16:31,768 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-12-22 09:16:31,769 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-12-22 09:16:31,772 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.12 09:16:31 BoogieIcfgContainer [2021-12-22 09:16:31,772 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-12-22 09:16:31,774 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-12-22 09:16:31,774 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-12-22 09:16:31,777 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-12-22 09:16:31,778 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.12 09:16:27" (1/3) ... [2021-12-22 09:16:31,778 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7fbfc623 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.12 09:16:31, skipping insertion in model container [2021-12-22 09:16:31,779 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 09:16:28" (2/3) ... [2021-12-22 09:16:31,779 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7fbfc623 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.12 09:16:31, skipping insertion in model container [2021-12-22 09:16:31,779 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.12 09:16:31" (3/3) ... [2021-12-22 09:16:31,780 INFO L111 eAbstractionObserver]: Analyzing ICFG Problem12_label19.c [2021-12-22 09:16:31,784 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-12-22 09:16:31,785 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-12-22 09:16:31,839 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-12-22 09:16:31,844 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-12-22 09:16:31,845 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-12-22 09:16:31,866 INFO L276 IsEmpty]: Start isEmpty. Operand has 818 states, 816 states have (on average 1.9178921568627452) internal successors, (1565), 817 states have internal predecessors, (1565), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 09:16:31,873 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-12-22 09:16:31,874 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 09:16:31,874 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 09:16:31,875 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 09:16:31,878 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 09:16:31,879 INFO L85 PathProgramCache]: Analyzing trace with hash -1414013846, now seen corresponding path program 1 times [2021-12-22 09:16:31,885 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 09:16:31,886 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [126196350] [2021-12-22 09:16:31,886 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 09:16:31,887 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 09:16:31,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 09:16:32,051 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 09:16:32,052 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 09:16:32,052 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [126196350] [2021-12-22 09:16:32,053 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [126196350] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 09:16:32,053 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 09:16:32,053 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-22 09:16:32,055 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [411167251] [2021-12-22 09:16:32,056 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 09:16:32,059 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-22 09:16:32,059 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 09:16:32,083 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-22 09:16:32,084 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-22 09:16:32,088 INFO L87 Difference]: Start difference. First operand has 818 states, 816 states have (on average 1.9178921568627452) internal successors, (1565), 817 states have internal predecessors, (1565), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 4.666666666666667) internal successors, (14), 2 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 09:16:35,127 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 09:16:35,127 INFO L93 Difference]: Finished difference Result 2388 states and 4629 transitions. [2021-12-22 09:16:35,129 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-22 09:16:35,130 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.666666666666667) internal successors, (14), 2 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2021-12-22 09:16:35,130 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 09:16:35,144 INFO L225 Difference]: With dead ends: 2388 [2021-12-22 09:16:35,145 INFO L226 Difference]: Without dead ends: 1506 [2021-12-22 09:16:35,150 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-22 09:16:35,152 INFO L933 BasicCegarLoop]: 92 mSDtfsCounter, 845 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 2337 mSolverCounterSat, 1058 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 845 SdHoareTripleChecker+Valid, 102 SdHoareTripleChecker+Invalid, 3395 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1058 IncrementalHoareTripleChecker+Valid, 2337 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.9s IncrementalHoareTripleChecker+Time [2021-12-22 09:16:35,153 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [845 Valid, 102 Invalid, 3395 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1058 Valid, 2337 Invalid, 0 Unknown, 0 Unchecked, 2.9s Time] [2021-12-22 09:16:35,167 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1506 states. [2021-12-22 09:16:35,222 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1506 to 1506. [2021-12-22 09:16:35,226 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1506 states, 1505 states have (on average 1.869767441860465) internal successors, (2814), 1505 states have internal predecessors, (2814), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 09:16:35,230 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1506 states to 1506 states and 2814 transitions. [2021-12-22 09:16:35,232 INFO L78 Accepts]: Start accepts. Automaton has 1506 states and 2814 transitions. Word has length 14 [2021-12-22 09:16:35,232 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 09:16:35,232 INFO L470 AbstractCegarLoop]: Abstraction has 1506 states and 2814 transitions. [2021-12-22 09:16:35,232 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.666666666666667) internal successors, (14), 2 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 09:16:35,232 INFO L276 IsEmpty]: Start isEmpty. Operand 1506 states and 2814 transitions. [2021-12-22 09:16:35,234 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2021-12-22 09:16:35,234 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 09:16:35,234 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 09:16:35,235 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-12-22 09:16:35,235 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 09:16:35,235 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 09:16:35,235 INFO L85 PathProgramCache]: Analyzing trace with hash 985469844, now seen corresponding path program 1 times [2021-12-22 09:16:35,236 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 09:16:35,236 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [244048869] [2021-12-22 09:16:35,236 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 09:16:35,236 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 09:16:35,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 09:16:35,427 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 09:16:35,428 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 09:16:35,428 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [244048869] [2021-12-22 09:16:35,428 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [244048869] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 09:16:35,429 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 09:16:35,429 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-22 09:16:35,429 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [23022684] [2021-12-22 09:16:35,429 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 09:16:35,431 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-22 09:16:35,431 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 09:16:35,432 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-22 09:16:35,432 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-22 09:16:35,432 INFO L87 Difference]: Start difference. First operand 1506 states and 2814 transitions. Second operand has 3 states, 3 states have (on average 29.0) internal successors, (87), 2 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 09:16:37,979 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 09:16:37,979 INFO L93 Difference]: Finished difference Result 4514 states and 8438 transitions. [2021-12-22 09:16:37,980 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-22 09:16:37,980 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 29.0) internal successors, (87), 2 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 87 [2021-12-22 09:16:37,980 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 09:16:37,990 INFO L225 Difference]: With dead ends: 4514 [2021-12-22 09:16:37,991 INFO L226 Difference]: Without dead ends: 3010 [2021-12-22 09:16:37,994 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-22 09:16:37,995 INFO L933 BasicCegarLoop]: 347 mSDtfsCounter, 918 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 2309 mSolverCounterSat, 550 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 918 SdHoareTripleChecker+Valid, 354 SdHoareTripleChecker+Invalid, 2859 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 550 IncrementalHoareTripleChecker+Valid, 2309 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-12-22 09:16:37,995 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [918 Valid, 354 Invalid, 2859 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [550 Valid, 2309 Invalid, 0 Unknown, 0 Unchecked, 2.4s Time] [2021-12-22 09:16:37,998 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3010 states. [2021-12-22 09:16:38,030 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3010 to 3008. [2021-12-22 09:16:38,036 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3008 states, 3007 states have (on average 1.6531426671100764) internal successors, (4971), 3007 states have internal predecessors, (4971), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 09:16:38,042 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3008 states to 3008 states and 4971 transitions. [2021-12-22 09:16:38,042 INFO L78 Accepts]: Start accepts. Automaton has 3008 states and 4971 transitions. Word has length 87 [2021-12-22 09:16:38,043 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 09:16:38,044 INFO L470 AbstractCegarLoop]: Abstraction has 3008 states and 4971 transitions. [2021-12-22 09:16:38,044 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 29.0) internal successors, (87), 2 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 09:16:38,044 INFO L276 IsEmpty]: Start isEmpty. Operand 3008 states and 4971 transitions. [2021-12-22 09:16:38,051 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2021-12-22 09:16:38,052 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 09:16:38,052 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 09:16:38,054 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-12-22 09:16:38,054 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 09:16:38,055 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 09:16:38,055 INFO L85 PathProgramCache]: Analyzing trace with hash -1025553521, now seen corresponding path program 1 times [2021-12-22 09:16:38,056 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 09:16:38,057 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [497047472] [2021-12-22 09:16:38,057 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 09:16:38,057 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 09:16:38,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 09:16:38,176 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 09:16:38,176 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 09:16:38,176 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [497047472] [2021-12-22 09:16:38,176 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [497047472] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 09:16:38,177 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 09:16:38,177 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-12-22 09:16:38,177 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1848905941] [2021-12-22 09:16:38,177 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 09:16:38,178 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-12-22 09:16:38,178 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 09:16:38,178 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-12-22 09:16:38,178 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-12-22 09:16:38,178 INFO L87 Difference]: Start difference. First operand 3008 states and 4971 transitions. Second operand has 4 states, 4 states have (on average 25.0) internal successors, (100), 3 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 09:16:42,213 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 09:16:42,213 INFO L93 Difference]: Finished difference Result 8267 states and 13429 transitions. [2021-12-22 09:16:42,214 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-12-22 09:16:42,214 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 25.0) internal successors, (100), 3 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 100 [2021-12-22 09:16:42,214 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 09:16:42,228 INFO L225 Difference]: With dead ends: 8267 [2021-12-22 09:16:42,228 INFO L226 Difference]: Without dead ends: 5261 [2021-12-22 09:16:42,231 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-12-22 09:16:42,237 INFO L933 BasicCegarLoop]: 337 mSDtfsCounter, 2154 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 4998 mSolverCounterSat, 851 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2154 SdHoareTripleChecker+Valid, 353 SdHoareTripleChecker+Invalid, 5849 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 851 IncrementalHoareTripleChecker+Valid, 4998 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.9s IncrementalHoareTripleChecker+Time [2021-12-22 09:16:42,238 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2154 Valid, 353 Invalid, 5849 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [851 Valid, 4998 Invalid, 0 Unknown, 0 Unchecked, 3.9s Time] [2021-12-22 09:16:42,243 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5261 states. [2021-12-22 09:16:42,296 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5261 to 5261. [2021-12-22 09:16:42,303 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5261 states, 5260 states have (on average 1.5102661596958176) internal successors, (7944), 5260 states have internal predecessors, (7944), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 09:16:42,310 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5261 states to 5261 states and 7944 transitions. [2021-12-22 09:16:42,311 INFO L78 Accepts]: Start accepts. Automaton has 5261 states and 7944 transitions. Word has length 100 [2021-12-22 09:16:42,311 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 09:16:42,311 INFO L470 AbstractCegarLoop]: Abstraction has 5261 states and 7944 transitions. [2021-12-22 09:16:42,312 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 25.0) internal successors, (100), 3 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 09:16:42,312 INFO L276 IsEmpty]: Start isEmpty. Operand 5261 states and 7944 transitions. [2021-12-22 09:16:42,314 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 156 [2021-12-22 09:16:42,314 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 09:16:42,314 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 09:16:42,314 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-12-22 09:16:42,314 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 09:16:42,315 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 09:16:42,315 INFO L85 PathProgramCache]: Analyzing trace with hash 933475690, now seen corresponding path program 1 times [2021-12-22 09:16:42,315 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 09:16:42,315 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [204453100] [2021-12-22 09:16:42,315 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 09:16:42,316 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 09:16:42,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 09:16:42,455 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-12-22 09:16:42,456 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 09:16:42,456 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [204453100] [2021-12-22 09:16:42,456 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [204453100] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 09:16:42,456 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [852791892] [2021-12-22 09:16:42,456 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 09:16:42,457 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 09:16:42,457 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 09:16:42,458 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-22 09:16:42,461 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-12-22 09:16:42,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 09:16:42,534 INFO L263 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 2 conjunts are in the unsatisfiable core [2021-12-22 09:16:42,540 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 09:16:42,835 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-12-22 09:16:42,835 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-22 09:16:42,836 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [852791892] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 09:16:42,836 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-12-22 09:16:42,836 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [3] total 4 [2021-12-22 09:16:42,836 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [600418206] [2021-12-22 09:16:42,836 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 09:16:42,837 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-22 09:16:42,839 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 09:16:42,840 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-22 09:16:42,840 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-12-22 09:16:42,840 INFO L87 Difference]: Start difference. First operand 5261 states and 7944 transitions. Second operand has 3 states, 3 states have (on average 48.333333333333336) internal successors, (145), 2 states have internal predecessors, (145), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 09:16:45,367 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 09:16:45,367 INFO L93 Difference]: Finished difference Result 14275 states and 22313 transitions. [2021-12-22 09:16:45,367 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-22 09:16:45,368 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 48.333333333333336) internal successors, (145), 2 states have internal predecessors, (145), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 155 [2021-12-22 09:16:45,368 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 09:16:45,395 INFO L225 Difference]: With dead ends: 14275 [2021-12-22 09:16:45,395 INFO L226 Difference]: Without dead ends: 9767 [2021-12-22 09:16:45,402 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 157 GetRequests, 154 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-12-22 09:16:45,407 INFO L933 BasicCegarLoop]: 659 mSDtfsCounter, 621 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 2456 mSolverCounterSat, 585 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 621 SdHoareTripleChecker+Valid, 666 SdHoareTripleChecker+Invalid, 3041 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 585 IncrementalHoareTripleChecker+Valid, 2456 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-12-22 09:16:45,409 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [621 Valid, 666 Invalid, 3041 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [585 Valid, 2456 Invalid, 0 Unknown, 0 Unchecked, 2.4s Time] [2021-12-22 09:16:45,417 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9767 states. [2021-12-22 09:16:45,538 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9767 to 9767. [2021-12-22 09:16:45,551 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9767 states, 9766 states have (on average 1.3878763055498669) internal successors, (13554), 9766 states have internal predecessors, (13554), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 09:16:45,569 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9767 states to 9767 states and 13554 transitions. [2021-12-22 09:16:45,570 INFO L78 Accepts]: Start accepts. Automaton has 9767 states and 13554 transitions. Word has length 155 [2021-12-22 09:16:45,571 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 09:16:45,571 INFO L470 AbstractCegarLoop]: Abstraction has 9767 states and 13554 transitions. [2021-12-22 09:16:45,571 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 48.333333333333336) internal successors, (145), 2 states have internal predecessors, (145), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 09:16:45,571 INFO L276 IsEmpty]: Start isEmpty. Operand 9767 states and 13554 transitions. [2021-12-22 09:16:45,573 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 172 [2021-12-22 09:16:45,573 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 09:16:45,573 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 09:16:45,590 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2021-12-22 09:16:45,787 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 09:16:45,788 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 09:16:45,788 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 09:16:45,788 INFO L85 PathProgramCache]: Analyzing trace with hash -1713023426, now seen corresponding path program 1 times [2021-12-22 09:16:45,788 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 09:16:45,788 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1458470681] [2021-12-22 09:16:45,788 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 09:16:45,788 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 09:16:45,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 09:16:45,903 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 93 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 09:16:45,903 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 09:16:45,903 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1458470681] [2021-12-22 09:16:45,904 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1458470681] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 09:16:45,904 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 09:16:45,904 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-12-22 09:16:45,904 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [866869921] [2021-12-22 09:16:45,905 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 09:16:45,905 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-12-22 09:16:45,905 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 09:16:45,906 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-12-22 09:16:45,906 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-12-22 09:16:45,906 INFO L87 Difference]: Start difference. First operand 9767 states and 13554 transitions. Second operand has 4 states, 4 states have (on average 42.75) internal successors, (171), 3 states have internal predecessors, (171), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 09:16:48,589 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 09:16:48,590 INFO L93 Difference]: Finished difference Result 23324 states and 32177 transitions. [2021-12-22 09:16:48,592 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-12-22 09:16:48,592 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 42.75) internal successors, (171), 3 states have internal predecessors, (171), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 171 [2021-12-22 09:16:48,592 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 09:16:48,623 INFO L225 Difference]: With dead ends: 23324 [2021-12-22 09:16:48,623 INFO L226 Difference]: Without dead ends: 14273 [2021-12-22 09:16:48,629 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-12-22 09:16:48,630 INFO L933 BasicCegarLoop]: 694 mSDtfsCounter, 704 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 3107 mSolverCounterSat, 393 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 704 SdHoareTripleChecker+Valid, 708 SdHoareTripleChecker+Invalid, 3500 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 393 IncrementalHoareTripleChecker+Valid, 3107 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2021-12-22 09:16:48,630 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [704 Valid, 708 Invalid, 3500 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [393 Valid, 3107 Invalid, 0 Unknown, 0 Unchecked, 2.5s Time] [2021-12-22 09:16:48,641 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14273 states. [2021-12-22 09:16:48,774 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14273 to 14273. [2021-12-22 09:16:48,801 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14273 states, 14272 states have (on average 1.2779568385650224) internal successors, (18239), 14272 states have internal predecessors, (18239), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 09:16:48,818 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14273 states to 14273 states and 18239 transitions. [2021-12-22 09:16:48,823 INFO L78 Accepts]: Start accepts. Automaton has 14273 states and 18239 transitions. Word has length 171 [2021-12-22 09:16:48,823 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 09:16:48,824 INFO L470 AbstractCegarLoop]: Abstraction has 14273 states and 18239 transitions. [2021-12-22 09:16:48,824 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 42.75) internal successors, (171), 3 states have internal predecessors, (171), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 09:16:48,824 INFO L276 IsEmpty]: Start isEmpty. Operand 14273 states and 18239 transitions. [2021-12-22 09:16:48,826 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 246 [2021-12-22 09:16:48,826 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 09:16:48,827 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 09:16:48,827 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-12-22 09:16:48,827 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 09:16:48,827 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 09:16:48,827 INFO L85 PathProgramCache]: Analyzing trace with hash 1812521605, now seen corresponding path program 1 times [2021-12-22 09:16:48,828 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 09:16:48,828 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1796582693] [2021-12-22 09:16:48,828 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 09:16:48,828 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 09:16:48,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 09:16:48,941 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 23 proven. 0 refuted. 0 times theorem prover too weak. 85 trivial. 0 not checked. [2021-12-22 09:16:48,942 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 09:16:48,942 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1796582693] [2021-12-22 09:16:48,942 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1796582693] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 09:16:48,942 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 09:16:48,942 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-12-22 09:16:48,942 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [583258398] [2021-12-22 09:16:48,942 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 09:16:48,943 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-22 09:16:48,943 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 09:16:48,943 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-22 09:16:48,943 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-22 09:16:48,944 INFO L87 Difference]: Start difference. First operand 14273 states and 18239 transitions. Second operand has 3 states, 3 states have (on average 53.666666666666664) internal successors, (161), 3 states have internal predecessors, (161), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 09:16:51,302 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 09:16:51,302 INFO L93 Difference]: Finished difference Result 34552 states and 45266 transitions. [2021-12-22 09:16:51,303 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-22 09:16:51,303 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 53.666666666666664) internal successors, (161), 3 states have internal predecessors, (161), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 245 [2021-12-22 09:16:51,303 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 09:16:51,394 INFO L225 Difference]: With dead ends: 34552 [2021-12-22 09:16:51,394 INFO L226 Difference]: Without dead ends: 21032 [2021-12-22 09:16:51,400 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-22 09:16:51,402 INFO L933 BasicCegarLoop]: 1301 mSDtfsCounter, 787 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 2162 mSolverCounterSat, 704 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 787 SdHoareTripleChecker+Valid, 1309 SdHoareTripleChecker+Invalid, 2866 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 704 IncrementalHoareTripleChecker+Valid, 2162 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2021-12-22 09:16:51,402 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [787 Valid, 1309 Invalid, 2866 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [704 Valid, 2162 Invalid, 0 Unknown, 0 Unchecked, 2.2s Time] [2021-12-22 09:16:51,414 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21032 states. [2021-12-22 09:16:51,581 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21032 to 20281. [2021-12-22 09:16:51,598 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20281 states, 20280 states have (on average 1.2444280078895464) internal successors, (25237), 20280 states have internal predecessors, (25237), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 09:16:51,619 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20281 states to 20281 states and 25237 transitions. [2021-12-22 09:16:51,620 INFO L78 Accepts]: Start accepts. Automaton has 20281 states and 25237 transitions. Word has length 245 [2021-12-22 09:16:51,620 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 09:16:51,620 INFO L470 AbstractCegarLoop]: Abstraction has 20281 states and 25237 transitions. [2021-12-22 09:16:51,620 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 53.666666666666664) internal successors, (161), 3 states have internal predecessors, (161), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 09:16:51,620 INFO L276 IsEmpty]: Start isEmpty. Operand 20281 states and 25237 transitions. [2021-12-22 09:16:51,622 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 255 [2021-12-22 09:16:51,622 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 09:16:51,623 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 09:16:51,623 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-12-22 09:16:51,623 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 09:16:51,623 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 09:16:51,623 INFO L85 PathProgramCache]: Analyzing trace with hash -1428700013, now seen corresponding path program 1 times [2021-12-22 09:16:51,624 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 09:16:51,624 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [761124245] [2021-12-22 09:16:51,624 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 09:16:51,624 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 09:16:51,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 09:16:51,700 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 23 proven. 0 refuted. 0 times theorem prover too weak. 98 trivial. 0 not checked. [2021-12-22 09:16:51,700 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 09:16:51,700 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [761124245] [2021-12-22 09:16:51,700 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [761124245] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 09:16:51,701 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 09:16:51,701 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-12-22 09:16:51,701 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1268931251] [2021-12-22 09:16:51,701 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 09:16:51,701 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-22 09:16:51,701 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 09:16:51,702 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-22 09:16:51,702 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-22 09:16:51,702 INFO L87 Difference]: Start difference. First operand 20281 states and 25237 transitions. Second operand has 3 states, 3 states have (on average 52.333333333333336) internal successors, (157), 3 states have internal predecessors, (157), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 09:16:54,119 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 09:16:54,120 INFO L93 Difference]: Finished difference Result 56331 states and 70969 transitions. [2021-12-22 09:16:54,120 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-22 09:16:54,120 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 52.333333333333336) internal successors, (157), 3 states have internal predecessors, (157), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 254 [2021-12-22 09:16:54,121 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 09:16:54,170 INFO L225 Difference]: With dead ends: 56331 [2021-12-22 09:16:54,170 INFO L226 Difference]: Without dead ends: 36803 [2021-12-22 09:16:54,184 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-22 09:16:54,185 INFO L933 BasicCegarLoop]: 1290 mSDtfsCounter, 750 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 2325 mSolverCounterSat, 527 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 750 SdHoareTripleChecker+Valid, 1298 SdHoareTripleChecker+Invalid, 2852 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 527 IncrementalHoareTripleChecker+Valid, 2325 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2021-12-22 09:16:54,185 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [750 Valid, 1298 Invalid, 2852 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [527 Valid, 2325 Invalid, 0 Unknown, 0 Unchecked, 2.2s Time] [2021-12-22 09:16:54,213 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36803 states. [2021-12-22 09:16:54,489 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36803 to 36052. [2021-12-22 09:16:54,519 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36052 states, 36051 states have (on average 1.1753626806468613) internal successors, (42373), 36051 states have internal predecessors, (42373), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 09:16:54,557 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36052 states to 36052 states and 42373 transitions. [2021-12-22 09:16:54,557 INFO L78 Accepts]: Start accepts. Automaton has 36052 states and 42373 transitions. Word has length 254 [2021-12-22 09:16:54,558 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 09:16:54,558 INFO L470 AbstractCegarLoop]: Abstraction has 36052 states and 42373 transitions. [2021-12-22 09:16:54,558 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 52.333333333333336) internal successors, (157), 3 states have internal predecessors, (157), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 09:16:54,558 INFO L276 IsEmpty]: Start isEmpty. Operand 36052 states and 42373 transitions. [2021-12-22 09:16:54,562 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 304 [2021-12-22 09:16:54,562 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 09:16:54,562 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 09:16:54,562 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-12-22 09:16:54,562 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 09:16:54,563 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 09:16:54,563 INFO L85 PathProgramCache]: Analyzing trace with hash -586872940, now seen corresponding path program 1 times [2021-12-22 09:16:54,563 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 09:16:54,563 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1567495602] [2021-12-22 09:16:54,563 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 09:16:54,564 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 09:16:54,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 09:16:54,694 INFO L134 CoverageAnalysis]: Checked inductivity of 163 backedges. 23 proven. 0 refuted. 0 times theorem prover too weak. 140 trivial. 0 not checked. [2021-12-22 09:16:54,694 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 09:16:54,694 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1567495602] [2021-12-22 09:16:54,694 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1567495602] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 09:16:54,694 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 09:16:54,695 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-22 09:16:54,695 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [337609087] [2021-12-22 09:16:54,711 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 09:16:54,711 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-22 09:16:54,712 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 09:16:54,712 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-22 09:16:54,712 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-22 09:16:54,712 INFO L87 Difference]: Start difference. First operand 36052 states and 42373 transitions. Second operand has 3 states, 3 states have (on average 54.666666666666664) internal successors, (164), 2 states have internal predecessors, (164), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 09:16:57,284 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 09:16:57,284 INFO L93 Difference]: Finished difference Result 87122 states and 104491 transitions. [2021-12-22 09:16:57,284 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-22 09:16:57,285 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 54.666666666666664) internal successors, (164), 2 states have internal predecessors, (164), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 303 [2021-12-22 09:16:57,285 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 09:16:57,363 INFO L225 Difference]: With dead ends: 87122 [2021-12-22 09:16:57,363 INFO L226 Difference]: Without dead ends: 51823 [2021-12-22 09:16:57,392 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-22 09:16:57,393 INFO L933 BasicCegarLoop]: 428 mSDtfsCounter, 689 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 1975 mSolverCounterSat, 856 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 689 SdHoareTripleChecker+Valid, 434 SdHoareTripleChecker+Invalid, 2831 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 856 IncrementalHoareTripleChecker+Valid, 1975 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2021-12-22 09:16:57,395 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [689 Valid, 434 Invalid, 2831 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [856 Valid, 1975 Invalid, 0 Unknown, 0 Unchecked, 2.2s Time] [2021-12-22 09:16:57,438 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51823 states. [2021-12-22 09:16:57,805 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51823 to 45815. [2021-12-22 09:16:57,988 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45815 states, 45814 states have (on average 1.1629851137206968) internal successors, (53281), 45814 states have internal predecessors, (53281), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 09:16:58,037 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45815 states to 45815 states and 53281 transitions. [2021-12-22 09:16:58,038 INFO L78 Accepts]: Start accepts. Automaton has 45815 states and 53281 transitions. Word has length 303 [2021-12-22 09:16:58,038 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 09:16:58,038 INFO L470 AbstractCegarLoop]: Abstraction has 45815 states and 53281 transitions. [2021-12-22 09:16:58,038 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 54.666666666666664) internal successors, (164), 2 states have internal predecessors, (164), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 09:16:58,039 INFO L276 IsEmpty]: Start isEmpty. Operand 45815 states and 53281 transitions. [2021-12-22 09:16:58,043 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 365 [2021-12-22 09:16:58,043 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 09:16:58,044 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 09:16:58,044 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-12-22 09:16:58,044 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 09:16:58,045 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 09:16:58,045 INFO L85 PathProgramCache]: Analyzing trace with hash 221484144, now seen corresponding path program 1 times [2021-12-22 09:16:58,045 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 09:16:58,045 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1694828558] [2021-12-22 09:16:58,045 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 09:16:58,046 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 09:16:58,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 09:16:58,204 INFO L134 CoverageAnalysis]: Checked inductivity of 323 backedges. 24 proven. 214 refuted. 0 times theorem prover too weak. 85 trivial. 0 not checked. [2021-12-22 09:16:58,204 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 09:16:58,204 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1694828558] [2021-12-22 09:16:58,207 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1694828558] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 09:16:58,207 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1317808418] [2021-12-22 09:16:58,207 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 09:16:58,207 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 09:16:58,208 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 09:16:58,208 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-22 09:16:58,209 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-12-22 09:16:58,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 09:16:58,432 INFO L263 TraceCheckSpWp]: Trace formula consists of 503 conjuncts, 2 conjunts are in the unsatisfiable core [2021-12-22 09:16:58,445 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 09:16:58,773 INFO L134 CoverageAnalysis]: Checked inductivity of 323 backedges. 35 proven. 0 refuted. 0 times theorem prover too weak. 288 trivial. 0 not checked. [2021-12-22 09:16:58,774 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-22 09:16:58,774 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1317808418] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 09:16:58,774 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-12-22 09:16:58,774 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2021-12-22 09:16:58,774 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [221322548] [2021-12-22 09:16:58,775 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 09:16:58,775 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-22 09:16:58,775 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 09:16:58,775 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-22 09:16:58,775 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-12-22 09:16:58,776 INFO L87 Difference]: Start difference. First operand 45815 states and 53281 transitions. Second operand has 3 states, 3 states have (on average 54.0) internal successors, (162), 3 states have internal predecessors, (162), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 09:17:01,118 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 09:17:01,118 INFO L93 Difference]: Finished difference Result 90877 states and 105804 transitions. [2021-12-22 09:17:01,119 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-22 09:17:01,119 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 54.0) internal successors, (162), 3 states have internal predecessors, (162), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 364 [2021-12-22 09:17:01,119 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 09:17:01,171 INFO L225 Difference]: With dead ends: 90877 [2021-12-22 09:17:01,171 INFO L226 Difference]: Without dead ends: 45815 [2021-12-22 09:17:01,197 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 369 GetRequests, 364 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-12-22 09:17:01,199 INFO L933 BasicCegarLoop]: 1180 mSDtfsCounter, 792 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 2192 mSolverCounterSat, 531 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 792 SdHoareTripleChecker+Valid, 1188 SdHoareTripleChecker+Invalid, 2723 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 531 IncrementalHoareTripleChecker+Valid, 2192 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.1s IncrementalHoareTripleChecker+Time [2021-12-22 09:17:01,199 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [792 Valid, 1188 Invalid, 2723 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [531 Valid, 2192 Invalid, 0 Unknown, 0 Unchecked, 2.1s Time] [2021-12-22 09:17:01,238 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45815 states. [2021-12-22 09:17:01,687 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45815 to 41309. [2021-12-22 09:17:01,709 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41309 states, 41308 states have (on average 1.1062748135954295) internal successors, (45698), 41308 states have internal predecessors, (45698), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 09:17:01,755 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41309 states to 41309 states and 45698 transitions. [2021-12-22 09:17:01,755 INFO L78 Accepts]: Start accepts. Automaton has 41309 states and 45698 transitions. Word has length 364 [2021-12-22 09:17:01,757 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 09:17:01,757 INFO L470 AbstractCegarLoop]: Abstraction has 41309 states and 45698 transitions. [2021-12-22 09:17:01,758 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 54.0) internal successors, (162), 3 states have internal predecessors, (162), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 09:17:01,758 INFO L276 IsEmpty]: Start isEmpty. Operand 41309 states and 45698 transitions. [2021-12-22 09:17:01,764 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 403 [2021-12-22 09:17:01,765 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 09:17:01,765 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 09:17:01,784 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-12-22 09:17:01,981 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2021-12-22 09:17:01,982 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 09:17:01,982 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 09:17:01,982 INFO L85 PathProgramCache]: Analyzing trace with hash -1004054467, now seen corresponding path program 1 times [2021-12-22 09:17:01,982 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 09:17:01,983 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [425850760] [2021-12-22 09:17:01,983 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 09:17:01,983 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 09:17:02,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 09:17:02,106 INFO L134 CoverageAnalysis]: Checked inductivity of 372 backedges. 274 proven. 0 refuted. 0 times theorem prover too weak. 98 trivial. 0 not checked. [2021-12-22 09:17:02,106 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 09:17:02,106 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [425850760] [2021-12-22 09:17:02,107 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [425850760] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 09:17:02,107 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 09:17:02,107 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-12-22 09:17:02,107 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1120524526] [2021-12-22 09:17:02,107 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 09:17:02,108 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-22 09:17:02,108 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 09:17:02,108 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-22 09:17:02,108 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-22 09:17:02,108 INFO L87 Difference]: Start difference. First operand 41309 states and 45698 transitions. Second operand has 3 states, 3 states have (on average 101.66666666666667) internal successors, (305), 3 states have internal predecessors, (305), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 09:17:04,437 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 09:17:04,437 INFO L93 Difference]: Finished difference Result 84118 states and 92971 transitions. [2021-12-22 09:17:04,441 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-22 09:17:04,441 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 101.66666666666667) internal successors, (305), 3 states have internal predecessors, (305), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 402 [2021-12-22 09:17:04,442 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 09:17:04,485 INFO L225 Difference]: With dead ends: 84118 [2021-12-22 09:17:04,485 INFO L226 Difference]: Without dead ends: 43562 [2021-12-22 09:17:04,502 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-22 09:17:04,502 INFO L933 BasicCegarLoop]: 999 mSDtfsCounter, 761 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 2085 mSolverCounterSat, 548 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 761 SdHoareTripleChecker+Valid, 1006 SdHoareTripleChecker+Invalid, 2633 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 548 IncrementalHoareTripleChecker+Valid, 2085 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.0s IncrementalHoareTripleChecker+Time [2021-12-22 09:17:04,503 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [761 Valid, 1006 Invalid, 2633 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [548 Valid, 2085 Invalid, 0 Unknown, 0 Unchecked, 2.0s Time] [2021-12-22 09:17:04,536 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43562 states. [2021-12-22 09:17:04,877 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43562 to 41309. [2021-12-22 09:17:04,901 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41309 states, 41308 states have (on average 1.0859397695361672) internal successors, (44858), 41308 states have internal predecessors, (44858), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 09:17:04,945 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41309 states to 41309 states and 44858 transitions. [2021-12-22 09:17:04,945 INFO L78 Accepts]: Start accepts. Automaton has 41309 states and 44858 transitions. Word has length 402 [2021-12-22 09:17:04,946 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 09:17:04,946 INFO L470 AbstractCegarLoop]: Abstraction has 41309 states and 44858 transitions. [2021-12-22 09:17:04,946 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 101.66666666666667) internal successors, (305), 3 states have internal predecessors, (305), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 09:17:04,946 INFO L276 IsEmpty]: Start isEmpty. Operand 41309 states and 44858 transitions. [2021-12-22 09:17:04,951 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 417 [2021-12-22 09:17:04,951 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 09:17:04,952 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 09:17:04,952 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-12-22 09:17:04,952 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 09:17:04,952 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 09:17:04,953 INFO L85 PathProgramCache]: Analyzing trace with hash 1516029530, now seen corresponding path program 1 times [2021-12-22 09:17:04,953 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 09:17:04,953 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [334149753] [2021-12-22 09:17:04,953 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 09:17:04,953 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 09:17:05,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 09:17:05,055 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 388 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-12-22 09:17:05,055 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 09:17:05,055 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [334149753] [2021-12-22 09:17:05,056 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [334149753] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 09:17:05,056 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 09:17:05,056 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-12-22 09:17:05,056 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [410187714] [2021-12-22 09:17:05,056 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 09:17:05,057 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-22 09:17:05,057 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 09:17:05,057 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-22 09:17:05,058 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-22 09:17:05,058 INFO L87 Difference]: Start difference. First operand 41309 states and 44858 transitions. Second operand has 3 states, 3 states have (on average 135.0) internal successors, (405), 3 states have internal predecessors, (405), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 09:17:07,593 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 09:17:07,593 INFO L93 Difference]: Finished difference Result 89375 states and 96938 transitions. [2021-12-22 09:17:07,593 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-22 09:17:07,594 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 135.0) internal successors, (405), 3 states have internal predecessors, (405), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 416 [2021-12-22 09:17:07,594 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 09:17:07,637 INFO L225 Difference]: With dead ends: 89375 [2021-12-22 09:17:07,638 INFO L226 Difference]: Without dead ends: 48819 [2021-12-22 09:17:07,661 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-22 09:17:07,661 INFO L933 BasicCegarLoop]: 1218 mSDtfsCounter, 655 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 2606 mSolverCounterSat, 305 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 655 SdHoareTripleChecker+Valid, 1225 SdHoareTripleChecker+Invalid, 2911 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 305 IncrementalHoareTripleChecker+Valid, 2606 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2021-12-22 09:17:07,662 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [655 Valid, 1225 Invalid, 2911 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [305 Valid, 2606 Invalid, 0 Unknown, 0 Unchecked, 2.2s Time] [2021-12-22 09:17:07,693 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48819 states. [2021-12-22 09:17:08,103 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48819 to 46566. [2021-12-22 09:17:08,134 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46566 states, 46565 states have (on average 1.079480296359927) internal successors, (50266), 46565 states have internal predecessors, (50266), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 09:17:08,177 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46566 states to 46566 states and 50266 transitions. [2021-12-22 09:17:08,177 INFO L78 Accepts]: Start accepts. Automaton has 46566 states and 50266 transitions. Word has length 416 [2021-12-22 09:17:08,178 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 09:17:08,178 INFO L470 AbstractCegarLoop]: Abstraction has 46566 states and 50266 transitions. [2021-12-22 09:17:08,178 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 135.0) internal successors, (405), 3 states have internal predecessors, (405), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 09:17:08,178 INFO L276 IsEmpty]: Start isEmpty. Operand 46566 states and 50266 transitions. [2021-12-22 09:17:08,183 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 421 [2021-12-22 09:17:08,183 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 09:17:08,183 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 09:17:08,183 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-12-22 09:17:08,184 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 09:17:08,184 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 09:17:08,184 INFO L85 PathProgramCache]: Analyzing trace with hash 2042729892, now seen corresponding path program 1 times [2021-12-22 09:17:08,184 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 09:17:08,184 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [275740315] [2021-12-22 09:17:08,184 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 09:17:08,184 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 09:17:08,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 09:17:08,313 INFO L134 CoverageAnalysis]: Checked inductivity of 404 backedges. 76 proven. 257 refuted. 0 times theorem prover too weak. 71 trivial. 0 not checked. [2021-12-22 09:17:08,313 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 09:17:08,313 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [275740315] [2021-12-22 09:17:08,313 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [275740315] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 09:17:08,313 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1186774680] [2021-12-22 09:17:08,313 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 09:17:08,314 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 09:17:08,412 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 09:17:08,426 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-22 09:17:08,429 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-12-22 09:17:08,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 09:17:08,527 INFO L263 TraceCheckSpWp]: Trace formula consists of 559 conjuncts, 2 conjunts are in the unsatisfiable core [2021-12-22 09:17:08,531 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 09:17:08,994 INFO L134 CoverageAnalysis]: Checked inductivity of 404 backedges. 292 proven. 0 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2021-12-22 09:17:08,994 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-22 09:17:08,994 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1186774680] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 09:17:08,994 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-12-22 09:17:08,994 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 6 [2021-12-22 09:17:08,994 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [751141902] [2021-12-22 09:17:08,994 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 09:17:08,995 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-22 09:17:08,995 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 09:17:08,996 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-22 09:17:08,996 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-12-22 09:17:08,996 INFO L87 Difference]: Start difference. First operand 46566 states and 50266 transitions. Second operand has 3 states, 3 states have (on average 103.0) internal successors, (309), 3 states have internal predecessors, (309), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 09:17:11,695 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 09:17:11,695 INFO L93 Difference]: Finished difference Result 125423 states and 136018 transitions. [2021-12-22 09:17:11,696 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-22 09:17:11,697 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 103.0) internal successors, (309), 3 states have internal predecessors, (309), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 420 [2021-12-22 09:17:11,697 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 09:17:11,776 INFO L225 Difference]: With dead ends: 125423 [2021-12-22 09:17:11,777 INFO L226 Difference]: Without dead ends: 79610 [2021-12-22 09:17:11,805 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 423 GetRequests, 419 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-12-22 09:17:11,805 INFO L933 BasicCegarLoop]: 1314 mSDtfsCounter, 611 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 2355 mSolverCounterSat, 525 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 611 SdHoareTripleChecker+Valid, 1322 SdHoareTripleChecker+Invalid, 2880 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 525 IncrementalHoareTripleChecker+Valid, 2355 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-12-22 09:17:11,805 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [611 Valid, 1322 Invalid, 2880 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [525 Valid, 2355 Invalid, 0 Unknown, 0 Unchecked, 2.3s Time] [2021-12-22 09:17:11,863 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79610 states. [2021-12-22 09:17:12,491 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79610 to 69096. [2021-12-22 09:17:12,535 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69096 states, 69095 states have (on average 1.0670091902453145) internal successors, (73725), 69095 states have internal predecessors, (73725), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 09:17:12,607 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69096 states to 69096 states and 73725 transitions. [2021-12-22 09:17:12,607 INFO L78 Accepts]: Start accepts. Automaton has 69096 states and 73725 transitions. Word has length 420 [2021-12-22 09:17:12,607 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 09:17:12,607 INFO L470 AbstractCegarLoop]: Abstraction has 69096 states and 73725 transitions. [2021-12-22 09:17:12,608 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 103.0) internal successors, (309), 3 states have internal predecessors, (309), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 09:17:12,608 INFO L276 IsEmpty]: Start isEmpty. Operand 69096 states and 73725 transitions. [2021-12-22 09:17:12,614 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 489 [2021-12-22 09:17:12,614 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 09:17:12,615 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 09:17:12,635 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-12-22 09:17:12,831 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 09:17:12,832 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 09:17:12,832 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 09:17:12,832 INFO L85 PathProgramCache]: Analyzing trace with hash 123197334, now seen corresponding path program 1 times [2021-12-22 09:17:12,832 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 09:17:12,832 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [150875876] [2021-12-22 09:17:12,833 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 09:17:12,833 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 09:17:12,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 09:17:13,221 INFO L134 CoverageAnalysis]: Checked inductivity of 683 backedges. 555 proven. 0 refuted. 0 times theorem prover too weak. 128 trivial. 0 not checked. [2021-12-22 09:17:13,221 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 09:17:13,221 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [150875876] [2021-12-22 09:17:13,221 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [150875876] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 09:17:13,221 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 09:17:13,222 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-12-22 09:17:13,222 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1854987902] [2021-12-22 09:17:13,224 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 09:17:13,224 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-22 09:17:13,225 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 09:17:13,225 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-22 09:17:13,225 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-22 09:17:13,225 INFO L87 Difference]: Start difference. First operand 69096 states and 73725 transitions. Second operand has 3 states, 3 states have (on average 120.66666666666667) internal successors, (362), 3 states have internal predecessors, (362), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 09:17:15,443 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 09:17:15,443 INFO L93 Difference]: Finished difference Result 159969 states and 171262 transitions. [2021-12-22 09:17:15,443 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-22 09:17:15,443 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 120.66666666666667) internal successors, (362), 3 states have internal predecessors, (362), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 488 [2021-12-22 09:17:15,444 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 09:17:15,540 INFO L225 Difference]: With dead ends: 159969 [2021-12-22 09:17:15,540 INFO L226 Difference]: Without dead ends: 91626 [2021-12-22 09:17:15,577 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-22 09:17:15,577 INFO L933 BasicCegarLoop]: 1270 mSDtfsCounter, 669 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 2236 mSolverCounterSat, 119 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 669 SdHoareTripleChecker+Valid, 1278 SdHoareTripleChecker+Invalid, 2355 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 119 IncrementalHoareTripleChecker+Valid, 2236 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2021-12-22 09:17:15,578 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [669 Valid, 1278 Invalid, 2355 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [119 Valid, 2236 Invalid, 0 Unknown, 0 Unchecked, 1.8s Time] [2021-12-22 09:17:15,640 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91626 states. [2021-12-22 09:17:16,419 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91626 to 89373. [2021-12-22 09:17:16,476 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89373 states, 89372 states have (on average 1.0631741485028867) internal successors, (95018), 89372 states have internal predecessors, (95018), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 09:17:16,579 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89373 states to 89373 states and 95018 transitions. [2021-12-22 09:17:16,579 INFO L78 Accepts]: Start accepts. Automaton has 89373 states and 95018 transitions. Word has length 488 [2021-12-22 09:17:16,580 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 09:17:16,580 INFO L470 AbstractCegarLoop]: Abstraction has 89373 states and 95018 transitions. [2021-12-22 09:17:16,580 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 120.66666666666667) internal successors, (362), 3 states have internal predecessors, (362), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 09:17:16,580 INFO L276 IsEmpty]: Start isEmpty. Operand 89373 states and 95018 transitions. [2021-12-22 09:17:16,587 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 506 [2021-12-22 09:17:16,588 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 09:17:16,588 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 09:17:16,588 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-12-22 09:17:16,588 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 09:17:16,588 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 09:17:16,589 INFO L85 PathProgramCache]: Analyzing trace with hash 627202212, now seen corresponding path program 1 times [2021-12-22 09:17:16,589 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 09:17:16,589 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1618848251] [2021-12-22 09:17:16,589 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 09:17:16,589 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 09:17:16,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 09:17:16,875 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 47 proven. 0 refuted. 0 times theorem prover too weak. 583 trivial. 0 not checked. [2021-12-22 09:17:16,875 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 09:17:16,875 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1618848251] [2021-12-22 09:17:16,875 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1618848251] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 09:17:16,875 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 09:17:16,876 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-12-22 09:17:16,876 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [431356127] [2021-12-22 09:17:16,876 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 09:17:16,876 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-22 09:17:16,876 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 09:17:16,877 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-22 09:17:16,877 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-22 09:17:16,877 INFO L87 Difference]: Start difference. First operand 89373 states and 95018 transitions. Second operand has 3 states, 3 states have (on average 59.333333333333336) internal successors, (178), 3 states have internal predecessors, (178), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 09:17:19,331 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 09:17:19,331 INFO L93 Difference]: Finished difference Result 193764 states and 206427 transitions. [2021-12-22 09:17:19,331 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-22 09:17:19,331 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 59.333333333333336) internal successors, (178), 3 states have internal predecessors, (178), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 505 [2021-12-22 09:17:19,332 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 09:17:19,464 INFO L225 Difference]: With dead ends: 193764 [2021-12-22 09:17:19,464 INFO L226 Difference]: Without dead ends: 105144 [2021-12-22 09:17:19,513 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-22 09:17:19,513 INFO L933 BasicCegarLoop]: 1109 mSDtfsCounter, 860 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 2198 mSolverCounterSat, 403 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 860 SdHoareTripleChecker+Valid, 1117 SdHoareTripleChecker+Invalid, 2601 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 403 IncrementalHoareTripleChecker+Valid, 2198 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.0s IncrementalHoareTripleChecker+Time [2021-12-22 09:17:19,514 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [860 Valid, 1117 Invalid, 2601 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [403 Valid, 2198 Invalid, 0 Unknown, 0 Unchecked, 2.0s Time] [2021-12-22 09:17:19,596 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105144 states. [2021-12-22 09:17:20,594 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105144 to 103642. [2021-12-22 09:17:20,661 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103642 states, 103641 states have (on average 1.0611244584672088) internal successors, (109976), 103641 states have internal predecessors, (109976), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 09:17:20,935 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103642 states to 103642 states and 109976 transitions. [2021-12-22 09:17:20,936 INFO L78 Accepts]: Start accepts. Automaton has 103642 states and 109976 transitions. Word has length 505 [2021-12-22 09:17:20,936 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 09:17:20,936 INFO L470 AbstractCegarLoop]: Abstraction has 103642 states and 109976 transitions. [2021-12-22 09:17:20,937 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 59.333333333333336) internal successors, (178), 3 states have internal predecessors, (178), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 09:17:20,937 INFO L276 IsEmpty]: Start isEmpty. Operand 103642 states and 109976 transitions. [2021-12-22 09:17:20,952 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 661 [2021-12-22 09:17:20,953 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 09:17:20,953 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 09:17:20,953 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-12-22 09:17:20,953 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 09:17:20,953 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 09:17:20,953 INFO L85 PathProgramCache]: Analyzing trace with hash 1020292177, now seen corresponding path program 1 times [2021-12-22 09:17:20,954 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 09:17:20,954 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1151239404] [2021-12-22 09:17:20,954 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 09:17:20,954 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 09:17:21,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 09:17:21,203 INFO L134 CoverageAnalysis]: Checked inductivity of 858 backedges. 811 proven. 47 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 09:17:21,204 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 09:17:21,204 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1151239404] [2021-12-22 09:17:21,204 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1151239404] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 09:17:21,204 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1738070714] [2021-12-22 09:17:21,204 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 09:17:21,204 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 09:17:21,205 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 09:17:21,205 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-22 09:17:21,206 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-12-22 09:17:21,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 09:17:21,365 INFO L263 TraceCheckSpWp]: Trace formula consists of 830 conjuncts, 5 conjunts are in the unsatisfiable core [2021-12-22 09:17:21,377 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 09:17:24,177 INFO L134 CoverageAnalysis]: Checked inductivity of 858 backedges. 730 proven. 116 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-12-22 09:17:24,177 INFO L328 TraceCheckSpWp]: Computing backward predicates...