./Ultimate.py --spec ../sv-benchmarks/c/properties/valid-memsafety.prp --file ../sv-benchmarks/c/list-simple/dll2c_remove_all_reverse.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version ae007674 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/AutomizerMemDerefMemtrack.xml -i ../sv-benchmarks/c/list-simple/dll2c_remove_all_reverse.i -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-DerefFreeMemtrack-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 valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash a81d76a671fec08918102c7898e8919d02b265d05707efa1508363dab4714d44 --- Real Ultimate output --- This is Ultimate 0.2.2-dev-ae00767 [2021-12-28 06:01:15,218 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-12-28 06:01:15,220 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-12-28 06:01:15,261 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-12-28 06:01:15,261 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-12-28 06:01:15,263 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-12-28 06:01:15,264 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-12-28 06:01:15,265 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-12-28 06:01:15,267 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-12-28 06:01:15,268 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-12-28 06:01:15,269 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-12-28 06:01:15,273 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-12-28 06:01:15,274 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-12-28 06:01:15,278 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-12-28 06:01:15,279 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-12-28 06:01:15,280 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-12-28 06:01:15,283 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-12-28 06:01:15,284 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-12-28 06:01:15,285 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-12-28 06:01:15,287 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-12-28 06:01:15,291 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-12-28 06:01:15,292 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-12-28 06:01:15,293 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-12-28 06:01:15,295 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-12-28 06:01:15,311 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-12-28 06:01:15,311 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-12-28 06:01:15,311 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-12-28 06:01:15,312 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-12-28 06:01:15,313 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-12-28 06:01:15,313 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-12-28 06:01:15,314 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-12-28 06:01:15,314 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-12-28 06:01:15,315 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-12-28 06:01:15,316 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-12-28 06:01:15,316 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-12-28 06:01:15,317 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-12-28 06:01:15,317 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-12-28 06:01:15,318 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-12-28 06:01:15,318 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-12-28 06:01:15,319 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-12-28 06:01:15,319 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-12-28 06:01:15,323 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf [2021-12-28 06:01:15,352 INFO L113 SettingsManager]: Loading preferences was successful [2021-12-28 06:01:15,353 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-12-28 06:01:15,354 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-12-28 06:01:15,354 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-12-28 06:01:15,355 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-12-28 06:01:15,355 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-12-28 06:01:15,356 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-12-28 06:01:15,357 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-12-28 06:01:15,357 INFO L138 SettingsManager]: * Use SBE=true [2021-12-28 06:01:15,357 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-12-28 06:01:15,358 INFO L138 SettingsManager]: * sizeof long=4 [2021-12-28 06:01:15,358 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-12-28 06:01:15,358 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-12-28 06:01:15,359 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-12-28 06:01:15,359 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-12-28 06:01:15,359 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-12-28 06:01:15,359 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-12-28 06:01:15,359 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-12-28 06:01:15,360 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-12-28 06:01:15,360 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-12-28 06:01:15,360 INFO L138 SettingsManager]: * sizeof long double=12 [2021-12-28 06:01:15,360 INFO L138 SettingsManager]: * Use constant arrays=true [2021-12-28 06:01:15,360 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-12-28 06:01:15,361 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-12-28 06:01:15,361 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-12-28 06:01:15,361 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-28 06:01:15,361 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-12-28 06:01:15,361 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-12-28 06:01:15,362 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-12-28 06:01:15,362 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-12-28 06:01:15,362 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> a81d76a671fec08918102c7898e8919d02b265d05707efa1508363dab4714d44 [2021-12-28 06:01:15,720 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-12-28 06:01:15,750 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-12-28 06:01:15,753 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-12-28 06:01:15,754 INFO L271 PluginConnector]: Initializing CDTParser... [2021-12-28 06:01:15,755 INFO L275 PluginConnector]: CDTParser initialized [2021-12-28 06:01:15,756 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/list-simple/dll2c_remove_all_reverse.i [2021-12-28 06:01:15,814 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2b287c06d/42fe2a30250941749fb28b3ca58f291f/FLAG0a673848e [2021-12-28 06:01:16,357 INFO L306 CDTParser]: Found 1 translation units. [2021-12-28 06:01:16,360 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/list-simple/dll2c_remove_all_reverse.i [2021-12-28 06:01:16,374 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2b287c06d/42fe2a30250941749fb28b3ca58f291f/FLAG0a673848e [2021-12-28 06:01:16,650 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2b287c06d/42fe2a30250941749fb28b3ca58f291f [2021-12-28 06:01:16,653 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-12-28 06:01:16,655 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-12-28 06:01:16,659 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-12-28 06:01:16,660 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-12-28 06:01:16,663 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-12-28 06:01:16,664 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 28.12 06:01:16" (1/1) ... [2021-12-28 06:01:16,665 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3a14f89c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.12 06:01:16, skipping insertion in model container [2021-12-28 06:01:16,665 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 28.12 06:01:16" (1/1) ... [2021-12-28 06:01:16,672 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-12-28 06:01:16,700 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-12-28 06:01:16,990 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/list-simple/dll2c_remove_all_reverse.i[24177,24190] [2021-12-28 06:01:16,992 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-28 06:01:17,007 INFO L203 MainTranslator]: Completed pre-run [2021-12-28 06:01:17,059 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/list-simple/dll2c_remove_all_reverse.i[24177,24190] [2021-12-28 06:01:17,061 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-28 06:01:17,095 INFO L208 MainTranslator]: Completed translation [2021-12-28 06:01:17,096 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.12 06:01:17 WrapperNode [2021-12-28 06:01:17,097 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-12-28 06:01:17,098 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-12-28 06:01:17,099 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-12-28 06:01:17,099 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-12-28 06:01:17,105 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.12 06:01:17" (1/1) ... [2021-12-28 06:01:17,117 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.12 06:01:17" (1/1) ... [2021-12-28 06:01:17,141 INFO L137 Inliner]: procedures = 126, calls = 37, calls flagged for inlining = 5, calls inlined = 5, statements flattened = 111 [2021-12-28 06:01:17,145 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-12-28 06:01:17,146 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-12-28 06:01:17,146 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-12-28 06:01:17,146 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-12-28 06:01:17,153 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.12 06:01:17" (1/1) ... [2021-12-28 06:01:17,154 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.12 06:01:17" (1/1) ... [2021-12-28 06:01:17,157 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.12 06:01:17" (1/1) ... [2021-12-28 06:01:17,157 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.12 06:01:17" (1/1) ... [2021-12-28 06:01:17,164 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.12 06:01:17" (1/1) ... [2021-12-28 06:01:17,172 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.12 06:01:17" (1/1) ... [2021-12-28 06:01:17,175 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.12 06:01:17" (1/1) ... [2021-12-28 06:01:17,181 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-12-28 06:01:17,182 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-12-28 06:01:17,182 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-12-28 06:01:17,183 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-12-28 06:01:17,184 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.12 06:01:17" (1/1) ... [2021-12-28 06:01:17,189 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-28 06:01:17,201 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-28 06:01:17,213 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) [2021-12-28 06:01:17,215 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 [2021-12-28 06:01:17,243 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-12-28 06:01:17,243 INFO L130 BoogieDeclarations]: Found specification of procedure node_create [2021-12-28 06:01:17,244 INFO L138 BoogieDeclarations]: Found implementation of procedure node_create [2021-12-28 06:01:17,244 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-12-28 06:01:17,244 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-12-28 06:01:17,244 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-12-28 06:01:17,244 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-12-28 06:01:17,244 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-12-28 06:01:17,244 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-12-28 06:01:17,245 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2021-12-28 06:01:17,245 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-12-28 06:01:17,245 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-12-28 06:01:17,245 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-12-28 06:01:17,339 INFO L234 CfgBuilder]: Building ICFG [2021-12-28 06:01:17,355 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2021-12-28 06:01:17,746 INFO L275 CfgBuilder]: Performing block encoding [2021-12-28 06:01:17,755 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-12-28 06:01:17,755 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-12-28 06:01:17,758 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.12 06:01:17 BoogieIcfgContainer [2021-12-28 06:01:17,758 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-12-28 06:01:17,760 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-12-28 06:01:17,760 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-12-28 06:01:17,763 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-12-28 06:01:17,763 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 28.12 06:01:16" (1/3) ... [2021-12-28 06:01:17,764 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@485d043a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 28.12 06:01:17, skipping insertion in model container [2021-12-28 06:01:17,764 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.12 06:01:17" (2/3) ... [2021-12-28 06:01:17,765 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@485d043a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 28.12 06:01:17, skipping insertion in model container [2021-12-28 06:01:17,765 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.12 06:01:17" (3/3) ... [2021-12-28 06:01:17,766 INFO L111 eAbstractionObserver]: Analyzing ICFG dll2c_remove_all_reverse.i [2021-12-28 06:01:17,771 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-12-28 06:01:17,771 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 44 error locations. [2021-12-28 06:01:17,822 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-12-28 06:01:17,830 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=false, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, 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 [2021-12-28 06:01:17,831 INFO L340 AbstractCegarLoop]: Starting to check reachability of 44 error locations. [2021-12-28 06:01:17,848 INFO L276 IsEmpty]: Start isEmpty. Operand has 98 states, 50 states have (on average 2.04) internal successors, (102), 94 states have internal predecessors, (102), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-28 06:01:17,857 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-12-28 06:01:17,858 INFO L506 BasicCegarLoop]: Found error trace [2021-12-28 06:01:17,858 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-12-28 06:01:17,859 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting node_createErr0REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 40 more)] === [2021-12-28 06:01:17,863 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-28 06:01:17,864 INFO L85 PathProgramCache]: Analyzing trace with hash 893702386, now seen corresponding path program 1 times [2021-12-28 06:01:17,882 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-28 06:01:17,883 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [524886772] [2021-12-28 06:01:17,883 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-28 06:01:17,884 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-28 06:01:17,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-28 06:01:18,073 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-28 06:01:18,074 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-28 06:01:18,074 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [524886772] [2021-12-28 06:01:18,075 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [524886772] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-28 06:01:18,075 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-28 06:01:18,075 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-28 06:01:18,077 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1602206522] [2021-12-28 06:01:18,077 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-28 06:01:18,081 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-28 06:01:18,082 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-28 06:01:18,115 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-28 06:01:18,116 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-28 06:01:18,119 INFO L87 Difference]: Start difference. First operand has 98 states, 50 states have (on average 2.04) internal successors, (102), 94 states have internal predecessors, (102), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Second operand has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-28 06:01:18,261 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-28 06:01:18,261 INFO L93 Difference]: Finished difference Result 95 states and 100 transitions. [2021-12-28 06:01:18,263 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-28 06:01:18,264 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2021-12-28 06:01:18,265 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-28 06:01:18,276 INFO L225 Difference]: With dead ends: 95 [2021-12-28 06:01:18,276 INFO L226 Difference]: Without dead ends: 92 [2021-12-28 06:01:18,279 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 [2021-12-28 06:01:18,283 INFO L933 BasicCegarLoop]: 91 mSDtfsCounter, 10 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 50 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 138 SdHoareTripleChecker+Invalid, 52 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 50 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-28 06:01:18,284 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 138 Invalid, 52 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 50 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-28 06:01:18,299 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2021-12-28 06:01:18,323 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 92. [2021-12-28 06:01:18,324 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 48 states have (on average 1.9166666666666667) internal successors, (92), 88 states have internal predecessors, (92), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-28 06:01:18,328 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 96 transitions. [2021-12-28 06:01:18,329 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 96 transitions. Word has length 6 [2021-12-28 06:01:18,329 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-28 06:01:18,330 INFO L470 AbstractCegarLoop]: Abstraction has 92 states and 96 transitions. [2021-12-28 06:01:18,330 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-28 06:01:18,330 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 96 transitions. [2021-12-28 06:01:18,330 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-12-28 06:01:18,331 INFO L506 BasicCegarLoop]: Found error trace [2021-12-28 06:01:18,331 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-12-28 06:01:18,331 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-12-28 06:01:18,332 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting node_createErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 40 more)] === [2021-12-28 06:01:18,332 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-28 06:01:18,333 INFO L85 PathProgramCache]: Analyzing trace with hash 893702387, now seen corresponding path program 1 times [2021-12-28 06:01:18,333 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-28 06:01:18,333 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1218368464] [2021-12-28 06:01:18,333 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-28 06:01:18,334 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-28 06:01:18,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-28 06:01:18,414 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-28 06:01:18,415 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-28 06:01:18,415 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1218368464] [2021-12-28 06:01:18,415 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1218368464] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-28 06:01:18,415 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-28 06:01:18,416 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-28 06:01:18,416 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [732015715] [2021-12-28 06:01:18,416 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-28 06:01:18,417 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-28 06:01:18,417 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-28 06:01:18,419 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-28 06:01:18,419 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-28 06:01:18,419 INFO L87 Difference]: Start difference. First operand 92 states and 96 transitions. Second operand has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-28 06:01:18,483 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-28 06:01:18,484 INFO L93 Difference]: Finished difference Result 89 states and 93 transitions. [2021-12-28 06:01:18,484 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-28 06:01:18,484 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2021-12-28 06:01:18,485 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-28 06:01:18,487 INFO L225 Difference]: With dead ends: 89 [2021-12-28 06:01:18,487 INFO L226 Difference]: Without dead ends: 89 [2021-12-28 06:01:18,491 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 [2021-12-28 06:01:18,492 INFO L933 BasicCegarLoop]: 88 mSDtfsCounter, 5 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 140 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-28 06:01:18,493 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 140 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 39 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-28 06:01:18,496 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2021-12-28 06:01:18,500 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 89. [2021-12-28 06:01:18,501 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89 states, 48 states have (on average 1.8541666666666667) internal successors, (89), 85 states have internal predecessors, (89), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-28 06:01:18,502 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 93 transitions. [2021-12-28 06:01:18,503 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 93 transitions. Word has length 6 [2021-12-28 06:01:18,503 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-28 06:01:18,503 INFO L470 AbstractCegarLoop]: Abstraction has 89 states and 93 transitions. [2021-12-28 06:01:18,503 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-28 06:01:18,504 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 93 transitions. [2021-12-28 06:01:18,504 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-12-28 06:01:18,505 INFO L506 BasicCegarLoop]: Found error trace [2021-12-28 06:01:18,505 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-28 06:01:18,505 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-12-28 06:01:18,506 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 40 more)] === [2021-12-28 06:01:18,506 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-28 06:01:18,506 INFO L85 PathProgramCache]: Analyzing trace with hash -413883200, now seen corresponding path program 1 times [2021-12-28 06:01:18,507 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-28 06:01:18,508 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2087433578] [2021-12-28 06:01:18,508 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-28 06:01:18,508 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-28 06:01:18,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-28 06:01:18,572 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-28 06:01:18,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-28 06:01:18,628 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-28 06:01:18,629 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-28 06:01:18,629 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2087433578] [2021-12-28 06:01:18,629 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2087433578] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-28 06:01:18,631 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-28 06:01:18,631 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-12-28 06:01:18,631 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [312748356] [2021-12-28 06:01:18,631 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-28 06:01:18,632 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-12-28 06:01:18,632 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-28 06:01:18,633 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-12-28 06:01:18,633 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-12-28 06:01:18,633 INFO L87 Difference]: Start difference. First operand 89 states and 93 transitions. Second operand has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-28 06:01:18,736 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-28 06:01:18,737 INFO L93 Difference]: Finished difference Result 100 states and 106 transitions. [2021-12-28 06:01:18,737 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-12-28 06:01:18,737 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2021-12-28 06:01:18,738 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-28 06:01:18,738 INFO L225 Difference]: With dead ends: 100 [2021-12-28 06:01:18,739 INFO L226 Difference]: Without dead ends: 100 [2021-12-28 06:01:18,739 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-12-28 06:01:18,740 INFO L933 BasicCegarLoop]: 91 mSDtfsCounter, 10 mSDsluCounter, 118 mSDsCounter, 0 mSdLazyCounter, 67 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 209 SdHoareTripleChecker+Invalid, 69 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 67 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-28 06:01:18,740 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 209 Invalid, 69 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 67 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-28 06:01:18,742 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2021-12-28 06:01:18,755 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 90. [2021-12-28 06:01:18,758 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 49 states have (on average 1.836734693877551) internal successors, (90), 86 states have internal predecessors, (90), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-28 06:01:18,761 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 94 transitions. [2021-12-28 06:01:18,761 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 94 transitions. Word has length 14 [2021-12-28 06:01:18,761 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-28 06:01:18,761 INFO L470 AbstractCegarLoop]: Abstraction has 90 states and 94 transitions. [2021-12-28 06:01:18,762 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-28 06:01:18,762 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 94 transitions. [2021-12-28 06:01:18,766 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-12-28 06:01:18,767 INFO L506 BasicCegarLoop]: Found error trace [2021-12-28 06:01:18,767 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-28 06:01:18,767 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-12-28 06:01:18,767 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 40 more)] === [2021-12-28 06:01:18,768 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-28 06:01:18,768 INFO L85 PathProgramCache]: Analyzing trace with hash 1410538016, now seen corresponding path program 1 times [2021-12-28 06:01:18,768 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-28 06:01:18,768 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [837043564] [2021-12-28 06:01:18,769 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-28 06:01:18,769 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-28 06:01:18,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-28 06:01:18,831 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-28 06:01:18,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-28 06:01:18,854 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2021-12-28 06:01:18,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-28 06:01:18,902 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-28 06:01:18,902 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-28 06:01:18,902 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [837043564] [2021-12-28 06:01:18,903 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [837043564] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-28 06:01:18,904 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-28 06:01:18,904 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-12-28 06:01:18,904 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [515692720] [2021-12-28 06:01:18,904 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-28 06:01:18,905 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-12-28 06:01:18,905 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-28 06:01:18,905 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-12-28 06:01:18,906 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-12-28 06:01:18,906 INFO L87 Difference]: Start difference. First operand 90 states and 94 transitions. Second operand has 7 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-12-28 06:01:19,138 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-28 06:01:19,139 INFO L93 Difference]: Finished difference Result 127 states and 134 transitions. [2021-12-28 06:01:19,139 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-12-28 06:01:19,140 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 24 [2021-12-28 06:01:19,140 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-28 06:01:19,144 INFO L225 Difference]: With dead ends: 127 [2021-12-28 06:01:19,144 INFO L226 Difference]: Without dead ends: 127 [2021-12-28 06:01:19,144 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-12-28 06:01:19,154 INFO L933 BasicCegarLoop]: 62 mSDtfsCounter, 57 mSDsluCounter, 197 mSDsCounter, 0 mSdLazyCounter, 278 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 57 SdHoareTripleChecker+Valid, 259 SdHoareTripleChecker+Invalid, 279 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 278 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-28 06:01:19,155 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [57 Valid, 259 Invalid, 279 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 278 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-28 06:01:19,157 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2021-12-28 06:01:19,162 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 89. [2021-12-28 06:01:19,163 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89 states, 49 states have (on average 1.816326530612245) internal successors, (89), 85 states have internal predecessors, (89), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-28 06:01:19,165 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 93 transitions. [2021-12-28 06:01:19,166 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 93 transitions. Word has length 24 [2021-12-28 06:01:19,166 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-28 06:01:19,166 INFO L470 AbstractCegarLoop]: Abstraction has 89 states and 93 transitions. [2021-12-28 06:01:19,166 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-12-28 06:01:19,166 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 93 transitions. [2021-12-28 06:01:19,167 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-12-28 06:01:19,167 INFO L506 BasicCegarLoop]: Found error trace [2021-12-28 06:01:19,167 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-28 06:01:19,167 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-12-28 06:01:19,168 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 40 more)] === [2021-12-28 06:01:19,168 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-28 06:01:19,168 INFO L85 PathProgramCache]: Analyzing trace with hash 1410538017, now seen corresponding path program 1 times [2021-12-28 06:01:19,168 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-28 06:01:19,169 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [830308543] [2021-12-28 06:01:19,169 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-28 06:01:19,169 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-28 06:01:19,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-28 06:01:19,250 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-28 06:01:19,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-28 06:01:19,281 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2021-12-28 06:01:19,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-28 06:01:19,348 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-28 06:01:19,348 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-28 06:01:19,348 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [830308543] [2021-12-28 06:01:19,348 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [830308543] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-28 06:01:19,349 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-28 06:01:19,349 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-12-28 06:01:19,349 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [736717323] [2021-12-28 06:01:19,349 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-28 06:01:19,351 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-12-28 06:01:19,351 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-28 06:01:19,351 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-12-28 06:01:19,351 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-12-28 06:01:19,352 INFO L87 Difference]: Start difference. First operand 89 states and 93 transitions. Second operand has 7 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 5 states have internal predecessors, (20), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-12-28 06:01:19,520 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-28 06:01:19,520 INFO L93 Difference]: Finished difference Result 89 states and 94 transitions. [2021-12-28 06:01:19,521 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-12-28 06:01:19,521 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 5 states have internal predecessors, (20), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 24 [2021-12-28 06:01:19,522 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-28 06:01:19,522 INFO L225 Difference]: With dead ends: 89 [2021-12-28 06:01:19,522 INFO L226 Difference]: Without dead ends: 89 [2021-12-28 06:01:19,522 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-12-28 06:01:19,523 INFO L933 BasicCegarLoop]: 57 mSDtfsCounter, 78 mSDsluCounter, 184 mSDsCounter, 0 mSdLazyCounter, 232 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 78 SdHoareTripleChecker+Valid, 241 SdHoareTripleChecker+Invalid, 232 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 232 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-28 06:01:19,523 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [78 Valid, 241 Invalid, 232 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 232 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-28 06:01:19,524 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2021-12-28 06:01:19,526 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 88. [2021-12-28 06:01:19,527 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 49 states have (on average 1.7959183673469388) internal successors, (88), 84 states have internal predecessors, (88), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-28 06:01:19,527 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 92 transitions. [2021-12-28 06:01:19,527 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 92 transitions. Word has length 24 [2021-12-28 06:01:19,528 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-28 06:01:19,528 INFO L470 AbstractCegarLoop]: Abstraction has 88 states and 92 transitions. [2021-12-28 06:01:19,528 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 5 states have internal predecessors, (20), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-12-28 06:01:19,528 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 92 transitions. [2021-12-28 06:01:19,529 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-12-28 06:01:19,529 INFO L506 BasicCegarLoop]: Found error trace [2021-12-28 06:01:19,529 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-28 06:01:19,529 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-12-28 06:01:19,529 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 40 more)] === [2021-12-28 06:01:19,529 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-28 06:01:19,530 INFO L85 PathProgramCache]: Analyzing trace with hash -1682632447, now seen corresponding path program 1 times [2021-12-28 06:01:19,530 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-28 06:01:19,530 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [671017688] [2021-12-28 06:01:19,530 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-28 06:01:19,530 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-28 06:01:19,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-28 06:01:19,591 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-28 06:01:19,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-28 06:01:19,632 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2021-12-28 06:01:19,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-28 06:01:19,691 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-28 06:01:19,692 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-28 06:01:19,692 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [671017688] [2021-12-28 06:01:19,692 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [671017688] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-28 06:01:19,692 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2057592580] [2021-12-28 06:01:19,692 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-28 06:01:19,692 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-28 06:01:19,692 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-28 06:01:19,699 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) [2021-12-28 06:01:19,705 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-12-28 06:01:19,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-28 06:01:19,848 INFO L263 TraceCheckSpWp]: Trace formula consists of 245 conjuncts, 15 conjunts are in the unsatisfiable core [2021-12-28 06:01:19,853 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-28 06:01:19,909 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-28 06:01:20,088 INFO L353 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-12-28 06:01:20,089 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 17 treesize of output 21 [2021-12-28 06:01:20,101 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-28 06:01:20,101 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-28 06:01:20,154 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2057592580] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-28 06:01:20,154 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-28 06:01:20,154 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 10 [2021-12-28 06:01:20,154 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1663267959] [2021-12-28 06:01:20,155 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-28 06:01:20,155 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-12-28 06:01:20,155 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-28 06:01:20,156 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-12-28 06:01:20,156 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2021-12-28 06:01:20,156 INFO L87 Difference]: Start difference. First operand 88 states and 92 transitions. Second operand has 11 states, 10 states have (on average 3.2) internal successors, (32), 8 states have internal predecessors, (32), 2 states have call successors, (4), 3 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-12-28 06:01:20,448 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-28 06:01:20,448 INFO L93 Difference]: Finished difference Result 132 states and 140 transitions. [2021-12-28 06:01:20,448 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-12-28 06:01:20,449 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 3.2) internal successors, (32), 8 states have internal predecessors, (32), 2 states have call successors, (4), 3 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 26 [2021-12-28 06:01:20,449 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-28 06:01:20,449 INFO L225 Difference]: With dead ends: 132 [2021-12-28 06:01:20,450 INFO L226 Difference]: Without dead ends: 132 [2021-12-28 06:01:20,450 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=42, Invalid=140, Unknown=0, NotChecked=0, Total=182 [2021-12-28 06:01:20,450 INFO L933 BasicCegarLoop]: 61 mSDtfsCounter, 49 mSDsluCounter, 333 mSDsCounter, 0 mSdLazyCounter, 436 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 394 SdHoareTripleChecker+Invalid, 490 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 436 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 48 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-28 06:01:20,451 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [49 Valid, 394 Invalid, 490 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 436 Invalid, 0 Unknown, 48 Unchecked, 0.3s Time] [2021-12-28 06:01:20,451 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2021-12-28 06:01:20,454 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 93. [2021-12-28 06:01:20,454 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 53 states have (on average 1.7735849056603774) internal successors, (94), 88 states have internal predecessors, (94), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-12-28 06:01:20,455 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 100 transitions. [2021-12-28 06:01:20,455 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 100 transitions. Word has length 26 [2021-12-28 06:01:20,455 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-28 06:01:20,455 INFO L470 AbstractCegarLoop]: Abstraction has 93 states and 100 transitions. [2021-12-28 06:01:20,455 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 3.2) internal successors, (32), 8 states have internal predecessors, (32), 2 states have call successors, (4), 3 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-12-28 06:01:20,456 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 100 transitions. [2021-12-28 06:01:20,464 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-12-28 06:01:20,465 INFO L506 BasicCegarLoop]: Found error trace [2021-12-28 06:01:20,465 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-28 06:01:20,489 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2021-12-28 06:01:20,675 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-12-28 06:01:20,676 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 40 more)] === [2021-12-28 06:01:20,676 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-28 06:01:20,676 INFO L85 PathProgramCache]: Analyzing trace with hash -1682632446, now seen corresponding path program 1 times [2021-12-28 06:01:20,676 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-28 06:01:20,676 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1670252134] [2021-12-28 06:01:20,677 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-28 06:01:20,677 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-28 06:01:20,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-28 06:01:20,748 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-28 06:01:20,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-28 06:01:20,817 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2021-12-28 06:01:20,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-28 06:01:20,876 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-28 06:01:20,876 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-28 06:01:20,876 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1670252134] [2021-12-28 06:01:20,876 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1670252134] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-28 06:01:20,877 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [988908758] [2021-12-28 06:01:20,877 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-28 06:01:20,877 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-28 06:01:20,877 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-28 06:01:20,878 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) [2021-12-28 06:01:20,880 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-12-28 06:01:20,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-28 06:01:20,982 INFO L263 TraceCheckSpWp]: Trace formula consists of 245 conjuncts, 31 conjunts are in the unsatisfiable core [2021-12-28 06:01:20,984 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-28 06:01:20,994 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-28 06:01:21,250 INFO L353 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2021-12-28 06:01:21,250 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 16 treesize of output 15 [2021-12-28 06:01:21,268 INFO L353 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-28 06:01:21,269 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2021-12-28 06:01:21,324 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-28 06:01:21,324 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-28 06:01:21,448 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [988908758] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-28 06:01:21,448 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-28 06:01:21,449 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 11] total 19 [2021-12-28 06:01:21,449 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1430586023] [2021-12-28 06:01:21,449 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-28 06:01:21,449 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-12-28 06:01:21,449 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-28 06:01:21,449 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-12-28 06:01:21,450 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=397, Unknown=0, NotChecked=0, Total=462 [2021-12-28 06:01:21,450 INFO L87 Difference]: Start difference. First operand 93 states and 100 transitions. Second operand has 20 states, 19 states have (on average 2.0) internal successors, (38), 15 states have internal predecessors, (38), 3 states have call successors, (4), 3 states have call predecessors, (4), 4 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2021-12-28 06:01:21,830 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-28 06:01:21,831 INFO L93 Difference]: Finished difference Result 95 states and 101 transitions. [2021-12-28 06:01:21,831 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-12-28 06:01:21,831 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 19 states have (on average 2.0) internal successors, (38), 15 states have internal predecessors, (38), 3 states have call successors, (4), 3 states have call predecessors, (4), 4 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) Word has length 26 [2021-12-28 06:01:21,832 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-28 06:01:21,832 INFO L225 Difference]: With dead ends: 95 [2021-12-28 06:01:21,832 INFO L226 Difference]: Without dead ends: 95 [2021-12-28 06:01:21,833 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 20 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 114 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=91, Invalid=509, Unknown=0, NotChecked=0, Total=600 [2021-12-28 06:01:21,833 INFO L933 BasicCegarLoop]: 80 mSDtfsCounter, 19 mSDsluCounter, 315 mSDsCounter, 0 mSdLazyCounter, 526 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 395 SdHoareTripleChecker+Invalid, 538 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 526 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-28 06:01:21,833 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 395 Invalid, 538 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 526 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-12-28 06:01:21,834 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2021-12-28 06:01:21,836 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 93. [2021-12-28 06:01:21,836 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 53 states have (on average 1.7547169811320755) internal successors, (93), 88 states have internal predecessors, (93), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-12-28 06:01:21,837 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 99 transitions. [2021-12-28 06:01:21,837 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 99 transitions. Word has length 26 [2021-12-28 06:01:21,837 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-28 06:01:21,838 INFO L470 AbstractCegarLoop]: Abstraction has 93 states and 99 transitions. [2021-12-28 06:01:21,838 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 19 states have (on average 2.0) internal successors, (38), 15 states have internal predecessors, (38), 3 states have call successors, (4), 3 states have call predecessors, (4), 4 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2021-12-28 06:01:21,838 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 99 transitions. [2021-12-28 06:01:21,839 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-12-28 06:01:21,839 INFO L506 BasicCegarLoop]: Found error trace [2021-12-28 06:01:21,839 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-28 06:01:21,865 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-12-28 06:01:22,055 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,SelfDestructingSolverStorable6 [2021-12-28 06:01:22,056 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 40 more)] === [2021-12-28 06:01:22,056 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-28 06:01:22,056 INFO L85 PathProgramCache]: Analyzing trace with hash -2101924137, now seen corresponding path program 1 times [2021-12-28 06:01:22,056 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-28 06:01:22,056 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [283375726] [2021-12-28 06:01:22,056 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-28 06:01:22,057 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-28 06:01:22,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-28 06:01:22,109 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-28 06:01:22,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-28 06:01:22,143 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2021-12-28 06:01:22,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-28 06:01:22,154 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-28 06:01:22,154 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-28 06:01:22,154 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [283375726] [2021-12-28 06:01:22,155 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [283375726] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-28 06:01:22,155 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1478655566] [2021-12-28 06:01:22,155 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-28 06:01:22,155 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-28 06:01:22,155 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-28 06:01:22,157 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) [2021-12-28 06:01:22,161 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-12-28 06:01:22,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-28 06:01:22,277 INFO L263 TraceCheckSpWp]: Trace formula consists of 255 conjuncts, 9 conjunts are in the unsatisfiable core [2021-12-28 06:01:22,280 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-28 06:01:22,353 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-28 06:01:22,353 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-28 06:01:22,460 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-28 06:01:22,461 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1478655566] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-28 06:01:22,461 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-28 06:01:22,461 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 6] total 7 [2021-12-28 06:01:22,461 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [823674651] [2021-12-28 06:01:22,461 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-28 06:01:22,463 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-12-28 06:01:22,463 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-28 06:01:22,463 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-12-28 06:01:22,464 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-12-28 06:01:22,464 INFO L87 Difference]: Start difference. First operand 93 states and 99 transitions. Second operand has 7 states, 7 states have (on average 3.7142857142857144) internal successors, (26), 5 states have internal predecessors, (26), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-28 06:01:22,582 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-28 06:01:22,582 INFO L93 Difference]: Finished difference Result 94 states and 99 transitions. [2021-12-28 06:01:22,583 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-12-28 06:01:22,583 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.7142857142857144) internal successors, (26), 5 states have internal predecessors, (26), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 28 [2021-12-28 06:01:22,583 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-28 06:01:22,584 INFO L225 Difference]: With dead ends: 94 [2021-12-28 06:01:22,584 INFO L226 Difference]: Without dead ends: 94 [2021-12-28 06:01:22,584 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 53 SyntacticMatches, 5 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-12-28 06:01:22,585 INFO L933 BasicCegarLoop]: 82 mSDtfsCounter, 4 mSDsluCounter, 343 mSDsCounter, 0 mSdLazyCounter, 113 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 425 SdHoareTripleChecker+Invalid, 114 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 113 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-28 06:01:22,585 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4 Valid, 425 Invalid, 114 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 113 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-28 06:01:22,585 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2021-12-28 06:01:22,587 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 93. [2021-12-28 06:01:22,588 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 53 states have (on average 1.7358490566037736) internal successors, (92), 88 states have internal predecessors, (92), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-12-28 06:01:22,588 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 98 transitions. [2021-12-28 06:01:22,589 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 98 transitions. Word has length 28 [2021-12-28 06:01:22,589 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-28 06:01:22,589 INFO L470 AbstractCegarLoop]: Abstraction has 93 states and 98 transitions. [2021-12-28 06:01:22,589 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.7142857142857144) internal successors, (26), 5 states have internal predecessors, (26), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-28 06:01:22,589 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 98 transitions. [2021-12-28 06:01:22,590 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-12-28 06:01:22,590 INFO L506 BasicCegarLoop]: Found error trace [2021-12-28 06:01:22,590 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-28 06:01:22,618 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-12-28 06:01:22,799 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-28 06:01:22,800 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 40 more)] === [2021-12-28 06:01:22,800 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-28 06:01:22,800 INFO L85 PathProgramCache]: Analyzing trace with hash -739919470, now seen corresponding path program 1 times [2021-12-28 06:01:22,800 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-28 06:01:22,800 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [241011224] [2021-12-28 06:01:22,801 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-28 06:01:22,801 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-28 06:01:22,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-28 06:01:22,870 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-28 06:01:22,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-28 06:01:22,885 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2021-12-28 06:01:22,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-28 06:01:22,899 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-12-28 06:01:22,900 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-28 06:01:22,900 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [241011224] [2021-12-28 06:01:22,900 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [241011224] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-28 06:01:22,900 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2125846575] [2021-12-28 06:01:22,900 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-28 06:01:22,901 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-28 06:01:22,901 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-28 06:01:22,903 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) [2021-12-28 06:01:22,934 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-12-28 06:01:23,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-28 06:01:23,048 INFO L263 TraceCheckSpWp]: Trace formula consists of 268 conjuncts, 11 conjunts are in the unsatisfiable core [2021-12-28 06:01:23,049 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-28 06:01:23,094 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-12-28 06:01:23,095 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-28 06:01:23,112 INFO L353 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2021-12-28 06:01:23,113 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 12 treesize of output 11 [2021-12-28 06:01:23,153 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-12-28 06:01:23,153 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2125846575] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-28 06:01:23,153 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-28 06:01:23,153 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 3, 3] total 5 [2021-12-28 06:01:23,153 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1421562210] [2021-12-28 06:01:23,154 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-28 06:01:23,154 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-12-28 06:01:23,154 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-28 06:01:23,155 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-12-28 06:01:23,155 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-12-28 06:01:23,155 INFO L87 Difference]: Start difference. First operand 93 states and 98 transitions. Second operand has 6 states, 5 states have (on average 4.6) internal successors, (23), 5 states have internal predecessors, (23), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-12-28 06:01:23,297 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-28 06:01:23,298 INFO L93 Difference]: Finished difference Result 135 states and 144 transitions. [2021-12-28 06:01:23,298 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-12-28 06:01:23,298 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 4.6) internal successors, (23), 5 states have internal predecessors, (23), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 29 [2021-12-28 06:01:23,298 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-28 06:01:23,299 INFO L225 Difference]: With dead ends: 135 [2021-12-28 06:01:23,299 INFO L226 Difference]: Without dead ends: 135 [2021-12-28 06:01:23,299 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 60 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2021-12-28 06:01:23,300 INFO L933 BasicCegarLoop]: 69 mSDtfsCounter, 85 mSDsluCounter, 142 mSDsCounter, 0 mSdLazyCounter, 192 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 85 SdHoareTripleChecker+Valid, 211 SdHoareTripleChecker+Invalid, 197 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 192 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-28 06:01:23,300 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [85 Valid, 211 Invalid, 197 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 192 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-28 06:01:23,301 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2021-12-28 06:01:23,302 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 96. [2021-12-28 06:01:23,303 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 96 states, 56 states have (on average 1.7321428571428572) internal successors, (97), 91 states have internal predecessors, (97), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-12-28 06:01:23,303 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 103 transitions. [2021-12-28 06:01:23,303 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 103 transitions. Word has length 29 [2021-12-28 06:01:23,304 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-28 06:01:23,304 INFO L470 AbstractCegarLoop]: Abstraction has 96 states and 103 transitions. [2021-12-28 06:01:23,304 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 4.6) internal successors, (23), 5 states have internal predecessors, (23), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-12-28 06:01:23,304 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 103 transitions. [2021-12-28 06:01:23,304 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-12-28 06:01:23,304 INFO L506 BasicCegarLoop]: Found error trace [2021-12-28 06:01:23,305 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-28 06:01:23,332 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-12-28 06:01:23,505 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-28 06:01:23,505 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 40 more)] === [2021-12-28 06:01:23,505 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-28 06:01:23,506 INFO L85 PathProgramCache]: Analyzing trace with hash -739919469, now seen corresponding path program 1 times [2021-12-28 06:01:23,506 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-28 06:01:23,506 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1735858385] [2021-12-28 06:01:23,506 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-28 06:01:23,506 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-28 06:01:23,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-28 06:01:23,599 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-28 06:01:23,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-28 06:01:23,632 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2021-12-28 06:01:23,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-28 06:01:23,651 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-28 06:01:23,651 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-28 06:01:23,651 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1735858385] [2021-12-28 06:01:23,651 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1735858385] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-28 06:01:23,652 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2119035626] [2021-12-28 06:01:23,652 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-28 06:01:23,652 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-28 06:01:23,652 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-28 06:01:23,653 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-28 06:01:23,654 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-12-28 06:01:23,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-28 06:01:23,772 INFO L263 TraceCheckSpWp]: Trace formula consists of 268 conjuncts, 16 conjunts are in the unsatisfiable core [2021-12-28 06:01:23,774 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-28 06:01:23,935 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-28 06:01:23,935 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-28 06:01:23,973 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-28 06:01:23,973 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 20 treesize of output 24 [2021-12-28 06:01:24,161 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-28 06:01:24,162 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2119035626] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-28 06:01:24,162 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-28 06:01:24,162 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 6, 6] total 15 [2021-12-28 06:01:24,162 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [951019281] [2021-12-28 06:01:24,163 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-28 06:01:24,163 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-12-28 06:01:24,164 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-28 06:01:24,164 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-12-28 06:01:24,164 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=201, Unknown=0, NotChecked=0, Total=240 [2021-12-28 06:01:24,164 INFO L87 Difference]: Start difference. First operand 96 states and 103 transitions. Second operand has 16 states, 15 states have (on average 3.4) internal successors, (51), 13 states have internal predecessors, (51), 4 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (5), 5 states have call predecessors, (5), 4 states have call successors, (5) [2021-12-28 06:01:24,415 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-28 06:01:24,415 INFO L93 Difference]: Finished difference Result 160 states and 168 transitions. [2021-12-28 06:01:24,416 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-12-28 06:01:24,416 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 3.4) internal successors, (51), 13 states have internal predecessors, (51), 4 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (5), 5 states have call predecessors, (5), 4 states have call successors, (5) Word has length 29 [2021-12-28 06:01:24,416 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-28 06:01:24,417 INFO L225 Difference]: With dead ends: 160 [2021-12-28 06:01:24,417 INFO L226 Difference]: Without dead ends: 160 [2021-12-28 06:01:24,417 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=54, Invalid=252, Unknown=0, NotChecked=0, Total=306 [2021-12-28 06:01:24,418 INFO L933 BasicCegarLoop]: 60 mSDtfsCounter, 206 mSDsluCounter, 364 mSDsCounter, 0 mSdLazyCounter, 345 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 207 SdHoareTripleChecker+Valid, 424 SdHoareTripleChecker+Invalid, 349 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 345 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-28 06:01:24,418 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [207 Valid, 424 Invalid, 349 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 345 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-28 06:01:24,419 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2021-12-28 06:01:24,423 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 96. [2021-12-28 06:01:24,424 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 96 states, 56 states have (on average 1.7142857142857142) internal successors, (96), 91 states have internal predecessors, (96), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-12-28 06:01:24,424 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 102 transitions. [2021-12-28 06:01:24,424 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 102 transitions. Word has length 29 [2021-12-28 06:01:24,425 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-28 06:01:24,425 INFO L470 AbstractCegarLoop]: Abstraction has 96 states and 102 transitions. [2021-12-28 06:01:24,425 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 15 states have (on average 3.4) internal successors, (51), 13 states have internal predecessors, (51), 4 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (5), 5 states have call predecessors, (5), 4 states have call successors, (5) [2021-12-28 06:01:24,425 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 102 transitions. [2021-12-28 06:01:24,426 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-12-28 06:01:24,426 INFO L506 BasicCegarLoop]: Found error trace [2021-12-28 06:01:24,426 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-28 06:01:24,444 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-12-28 06:01:24,631 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-12-28 06:01:24,632 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr6REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 40 more)] === [2021-12-28 06:01:24,632 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-28 06:01:24,632 INFO L85 PathProgramCache]: Analyzing trace with hash -1462667085, now seen corresponding path program 1 times [2021-12-28 06:01:24,632 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-28 06:01:24,632 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1893514951] [2021-12-28 06:01:24,633 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-28 06:01:24,633 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-28 06:01:24,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-28 06:01:24,702 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-28 06:01:24,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-28 06:01:24,715 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2021-12-28 06:01:24,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-28 06:01:24,740 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-28 06:01:24,740 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-28 06:01:24,741 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1893514951] [2021-12-28 06:01:24,741 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1893514951] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-28 06:01:24,741 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-28 06:01:24,741 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-12-28 06:01:24,741 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1517529705] [2021-12-28 06:01:24,741 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-28 06:01:24,742 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-12-28 06:01:24,742 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-28 06:01:24,742 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-12-28 06:01:24,743 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-12-28 06:01:24,743 INFO L87 Difference]: Start difference. First operand 96 states and 102 transitions. Second operand has 8 states, 7 states have (on average 3.4285714285714284) internal successors, (24), 6 states have internal predecessors, (24), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-12-28 06:01:24,938 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-28 06:01:24,938 INFO L93 Difference]: Finished difference Result 133 states and 141 transitions. [2021-12-28 06:01:24,939 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-12-28 06:01:24,939 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 3.4285714285714284) internal successors, (24), 6 states have internal predecessors, (24), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 30 [2021-12-28 06:01:24,939 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-28 06:01:24,940 INFO L225 Difference]: With dead ends: 133 [2021-12-28 06:01:24,940 INFO L226 Difference]: Without dead ends: 133 [2021-12-28 06:01:24,940 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2021-12-28 06:01:24,941 INFO L933 BasicCegarLoop]: 60 mSDtfsCounter, 95 mSDsluCounter, 225 mSDsCounter, 0 mSdLazyCounter, 324 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 95 SdHoareTripleChecker+Valid, 285 SdHoareTripleChecker+Invalid, 327 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 324 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-28 06:01:24,941 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [95 Valid, 285 Invalid, 327 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 324 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-28 06:01:24,942 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2021-12-28 06:01:24,943 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 95. [2021-12-28 06:01:24,944 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 56 states have (on average 1.6964285714285714) internal successors, (95), 90 states have internal predecessors, (95), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-12-28 06:01:24,944 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 101 transitions. [2021-12-28 06:01:24,945 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 101 transitions. Word has length 30 [2021-12-28 06:01:24,945 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-28 06:01:24,945 INFO L470 AbstractCegarLoop]: Abstraction has 95 states and 101 transitions. [2021-12-28 06:01:24,945 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 3.4285714285714284) internal successors, (24), 6 states have internal predecessors, (24), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-12-28 06:01:24,945 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 101 transitions. [2021-12-28 06:01:24,946 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-12-28 06:01:24,946 INFO L506 BasicCegarLoop]: Found error trace [2021-12-28 06:01:24,946 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-28 06:01:24,946 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-12-28 06:01:24,946 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 40 more)] === [2021-12-28 06:01:24,947 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-28 06:01:24,947 INFO L85 PathProgramCache]: Analyzing trace with hash -1462667084, now seen corresponding path program 1 times [2021-12-28 06:01:24,947 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-28 06:01:24,947 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1649848055] [2021-12-28 06:01:24,947 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-28 06:01:24,948 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-28 06:01:24,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-28 06:01:25,009 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-28 06:01:25,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-28 06:01:25,017 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2021-12-28 06:01:25,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-28 06:01:25,046 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-28 06:01:25,047 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-28 06:01:25,047 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1649848055] [2021-12-28 06:01:25,047 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1649848055] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-28 06:01:25,047 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-28 06:01:25,047 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-12-28 06:01:25,048 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1301399108] [2021-12-28 06:01:25,048 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-28 06:01:25,048 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-12-28 06:01:25,048 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-28 06:01:25,049 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-12-28 06:01:25,049 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-12-28 06:01:25,049 INFO L87 Difference]: Start difference. First operand 95 states and 101 transitions. Second operand has 8 states, 7 states have (on average 3.7142857142857144) internal successors, (26), 6 states have internal predecessors, (26), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-12-28 06:01:25,207 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-28 06:01:25,207 INFO L93 Difference]: Finished difference Result 94 states and 100 transitions. [2021-12-28 06:01:25,207 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-12-28 06:01:25,208 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 3.7142857142857144) internal successors, (26), 6 states have internal predecessors, (26), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 30 [2021-12-28 06:01:25,208 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-28 06:01:25,208 INFO L225 Difference]: With dead ends: 94 [2021-12-28 06:01:25,209 INFO L226 Difference]: Without dead ends: 94 [2021-12-28 06:01:25,209 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2021-12-28 06:01:25,209 INFO L933 BasicCegarLoop]: 55 mSDtfsCounter, 138 mSDsluCounter, 181 mSDsCounter, 0 mSdLazyCounter, 251 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 138 SdHoareTripleChecker+Valid, 236 SdHoareTripleChecker+Invalid, 251 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 251 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-28 06:01:25,210 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [138 Valid, 236 Invalid, 251 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 251 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-28 06:01:25,210 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2021-12-28 06:01:25,212 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 94. [2021-12-28 06:01:25,212 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 94 states, 56 states have (on average 1.6785714285714286) internal successors, (94), 89 states have internal predecessors, (94), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-12-28 06:01:25,213 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 100 transitions. [2021-12-28 06:01:25,213 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 100 transitions. Word has length 30 [2021-12-28 06:01:25,218 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-28 06:01:25,218 INFO L470 AbstractCegarLoop]: Abstraction has 94 states and 100 transitions. [2021-12-28 06:01:25,218 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 3.7142857142857144) internal successors, (26), 6 states have internal predecessors, (26), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-12-28 06:01:25,218 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 100 transitions. [2021-12-28 06:01:25,219 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-12-28 06:01:25,219 INFO L506 BasicCegarLoop]: Found error trace [2021-12-28 06:01:25,219 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-28 06:01:25,219 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-12-28 06:01:25,219 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr8REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 40 more)] === [2021-12-28 06:01:25,223 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-28 06:01:25,223 INFO L85 PathProgramCache]: Analyzing trace with hash 2100539894, now seen corresponding path program 1 times [2021-12-28 06:01:25,224 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-28 06:01:25,224 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1078365043] [2021-12-28 06:01:25,224 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-28 06:01:25,224 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-28 06:01:25,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-28 06:01:25,308 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-28 06:01:25,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-28 06:01:25,363 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2021-12-28 06:01:25,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-28 06:01:25,401 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-12-28 06:01:25,402 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-28 06:01:25,402 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1078365043] [2021-12-28 06:01:25,402 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1078365043] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-28 06:01:25,402 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-28 06:01:25,402 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-12-28 06:01:25,403 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2071941150] [2021-12-28 06:01:25,403 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-28 06:01:25,403 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-12-28 06:01:25,403 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-28 06:01:25,404 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-12-28 06:01:25,404 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-12-28 06:01:25,404 INFO L87 Difference]: Start difference. First operand 94 states and 100 transitions. Second operand has 7 states, 6 states have (on average 3.8333333333333335) internal successors, (23), 6 states have internal predecessors, (23), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-12-28 06:01:25,572 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-28 06:01:25,573 INFO L93 Difference]: Finished difference Result 124 states and 132 transitions. [2021-12-28 06:01:25,573 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-12-28 06:01:25,573 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 3.8333333333333335) internal successors, (23), 6 states have internal predecessors, (23), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 34 [2021-12-28 06:01:25,573 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-28 06:01:25,574 INFO L225 Difference]: With dead ends: 124 [2021-12-28 06:01:25,574 INFO L226 Difference]: Without dead ends: 124 [2021-12-28 06:01:25,574 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-12-28 06:01:25,575 INFO L933 BasicCegarLoop]: 51 mSDtfsCounter, 111 mSDsluCounter, 151 mSDsCounter, 0 mSdLazyCounter, 263 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 111 SdHoareTripleChecker+Valid, 202 SdHoareTripleChecker+Invalid, 276 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 263 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-28 06:01:25,575 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [111 Valid, 202 Invalid, 276 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 263 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-28 06:01:25,576 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2021-12-28 06:01:25,577 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 94. [2021-12-28 06:01:25,578 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 94 states, 59 states have (on average 1.6440677966101696) internal successors, (97), 89 states have internal predecessors, (97), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-12-28 06:01:25,578 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 103 transitions. [2021-12-28 06:01:25,578 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 103 transitions. Word has length 34 [2021-12-28 06:01:25,578 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-28 06:01:25,578 INFO L470 AbstractCegarLoop]: Abstraction has 94 states and 103 transitions. [2021-12-28 06:01:25,578 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 3.8333333333333335) internal successors, (23), 6 states have internal predecessors, (23), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-12-28 06:01:25,579 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 103 transitions. [2021-12-28 06:01:25,579 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-12-28 06:01:25,579 INFO L506 BasicCegarLoop]: Found error trace [2021-12-28 06:01:25,579 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-28 06:01:25,580 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-12-28 06:01:25,580 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 40 more)] === [2021-12-28 06:01:25,580 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-28 06:01:25,580 INFO L85 PathProgramCache]: Analyzing trace with hash 2100539895, now seen corresponding path program 1 times [2021-12-28 06:01:25,580 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-28 06:01:25,581 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1223790466] [2021-12-28 06:01:25,581 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-28 06:01:25,581 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-28 06:01:25,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-28 06:01:25,671 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-28 06:01:25,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-28 06:01:25,714 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2021-12-28 06:01:25,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-28 06:01:25,734 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-12-28 06:01:25,735 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-28 06:01:25,735 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1223790466] [2021-12-28 06:01:25,735 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1223790466] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-28 06:01:25,735 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [951737172] [2021-12-28 06:01:25,735 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-28 06:01:25,735 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-28 06:01:25,736 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-28 06:01:25,737 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-28 06:01:25,762 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-12-28 06:01:25,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-28 06:01:25,917 INFO L263 TraceCheckSpWp]: Trace formula consists of 319 conjuncts, 22 conjunts are in the unsatisfiable core [2021-12-28 06:01:25,924 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-28 06:01:25,937 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-28 06:01:25,959 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2021-12-28 06:01:26,106 WARN L320 FreeRefinementEngine]: Global settings require throwing the following exception [2021-12-28 06:01:26,136 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-12-28 06:01:26,307 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-28 06:01:26,307 FATAL L? ?]: An unrecoverable error occured during an interaction with an SMT solver: de.uni_freiburg.informatik.ultimate.logic.SMTLIBException: line 93827 column 46: unknown constant v_#length_BEFORE_CALL_4 at de.uni_freiburg.informatik.ultimate.smtsolver.external.Parser$Action$.CUP$do_action(Parser.java:1458) at de.uni_freiburg.informatik.ultimate.smtsolver.external.Parser.do_action(Parser.java:658) at com.github.jhoenicke.javacup.runtime.LRParser.parse(LRParser.java:383) at de.uni_freiburg.informatik.ultimate.smtsolver.external.Executor.parse(Executor.java:239) at de.uni_freiburg.informatik.ultimate.smtsolver.external.Executor.parseSuccess(Executor.java:258) at de.uni_freiburg.informatik.ultimate.smtsolver.external.Scriptor.assertTerm(Scriptor.java:147) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.arrays.DiffWrapperScript$DiffTransformer.checkOrAddAxiom(DiffWrapperScript.java:161) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.arrays.DiffWrapperScript$DiffTransformer.convertApplicationTerm(DiffWrapperScript.java:171) at de.uni_freiburg.informatik.ultimate.logic.TermTransformer$BuildApplicationTerm.walk(TermTransformer.java:339) at de.uni_freiburg.informatik.ultimate.logic.NonRecursive.run(NonRecursive.java:115) at de.uni_freiburg.informatik.ultimate.logic.NonRecursive.run(NonRecursive.java:106) at de.uni_freiburg.informatik.ultimate.logic.TermTransformer.transform(TermTransformer.java:272) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.arrays.DiffWrapperScript.assertTerm(DiffWrapperScript.java:109) at de.uni_freiburg.informatik.ultimate.logic.WrapperScript.assertTerm(WrapperScript.java:158) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.ManagedScript.assertTerm(ManagedScript.java:134) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.MonolithicImplicationChecker.checkImplication(MonolithicImplicationChecker.java:83) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier$PredicateComparison.compare(PredicateUnifier.java:829) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier$PredicateComparison.(PredicateUnifier.java:773) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate(PredicateUnifier.java:345) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate(PredicateUnifier.java:305) at de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.singletracecheck.TraceCheckSpWp$UnifyPostprocessor.postprocess(TraceCheckSpWp.java:582) at de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.predicates.IterativePredicateTransformer.applyPostprocessors(IterativePredicateTransformer.java:420) at de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.predicates.IterativePredicateTransformer.computeStrongestPostconditionSequence(IterativePredicateTransformer.java:199) at de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.singletracecheck.TraceCheckSpWp.computeInterpolantsUsingUnsatCore(TraceCheckSpWp.java:299) at de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.singletracecheck.TraceCheckSpWp.computeInterpolants(TraceCheckSpWp.java:185) at de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.singletracecheck.TraceCheckSpWp.(TraceCheckSpWp.java:163) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSpWp.construct(IpTcStrategyModuleSpWp.java:108) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSpWp.construct(IpTcStrategyModuleSpWp.java:1) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-12-28 06:01:26,311 INFO L158 Benchmark]: Toolchain (without parser) took 9655.39ms. Allocated memory was 71.3MB in the beginning and 117.4MB in the end (delta: 46.1MB). Free memory was 52.5MB in the beginning and 76.6MB in the end (delta: -24.1MB). Peak memory consumption was 22.7MB. Max. memory is 16.1GB. [2021-12-28 06:01:26,311 INFO L158 Benchmark]: CDTParser took 0.20ms. Allocated memory is still 71.3MB. Free memory was 52.0MB in the beginning and 52.0MB in the end (delta: 49.4kB). There was no memory consumed. Max. memory is 16.1GB. [2021-12-28 06:01:26,311 INFO L158 Benchmark]: CACSL2BoogieTranslator took 438.39ms. Allocated memory is still 71.3MB. Free memory was 52.3MB in the beginning and 47.8MB in the end (delta: 4.5MB). Peak memory consumption was 12.6MB. Max. memory is 16.1GB. [2021-12-28 06:01:26,311 INFO L158 Benchmark]: Boogie Procedure Inliner took 46.55ms. Allocated memory is still 71.3MB. Free memory was 47.8MB in the beginning and 45.5MB in the end (delta: 2.3MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-12-28 06:01:26,312 INFO L158 Benchmark]: Boogie Preprocessor took 35.92ms. Allocated memory is still 71.3MB. Free memory was 45.5MB in the beginning and 43.9MB in the end (delta: 1.6MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-12-28 06:01:26,312 INFO L158 Benchmark]: RCFGBuilder took 575.95ms. Allocated memory is still 71.3MB. Free memory was 43.9MB in the beginning and 49.2MB in the end (delta: -5.2MB). Peak memory consumption was 18.9MB. Max. memory is 16.1GB. [2021-12-28 06:01:26,312 INFO L158 Benchmark]: TraceAbstraction took 8550.42ms. Allocated memory was 71.3MB in the beginning and 117.4MB in the end (delta: 46.1MB). Free memory was 48.9MB in the beginning and 76.6MB in the end (delta: -27.7MB). Peak memory consumption was 19.1MB. Max. memory is 16.1GB. [2021-12-28 06:01:26,314 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.20ms. Allocated memory is still 71.3MB. Free memory was 52.0MB in the beginning and 52.0MB in the end (delta: 49.4kB). There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 438.39ms. Allocated memory is still 71.3MB. Free memory was 52.3MB in the beginning and 47.8MB in the end (delta: 4.5MB). Peak memory consumption was 12.6MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 46.55ms. Allocated memory is still 71.3MB. Free memory was 47.8MB in the beginning and 45.5MB in the end (delta: 2.3MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Boogie Preprocessor took 35.92ms. Allocated memory is still 71.3MB. Free memory was 45.5MB in the beginning and 43.9MB in the end (delta: 1.6MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * RCFGBuilder took 575.95ms. Allocated memory is still 71.3MB. Free memory was 43.9MB in the beginning and 49.2MB in the end (delta: -5.2MB). Peak memory consumption was 18.9MB. Max. memory is 16.1GB. * TraceAbstraction took 8550.42ms. Allocated memory was 71.3MB in the beginning and 117.4MB in the end (delta: 46.1MB). Free memory was 48.9MB in the beginning and 76.6MB in the end (delta: -27.7MB). Peak memory consumption was 19.1MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - ExceptionOrErrorResult: SMTLIBException: line 93827 column 46: unknown constant v_#length_BEFORE_CALL_4 de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMTLIBException: line 93827 column 46: unknown constant v_#length_BEFORE_CALL_4: de.uni_freiburg.informatik.ultimate.smtsolver.external.Parser$Action$.CUP$do_action(Parser.java:1458) RESULT: Ultimate could not prove your program: Toolchain returned no result. [2021-12-28 06:01:26,327 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 1 Received shutdown request... --- End real Ultimate output --- Execution finished normally Using bit-precise analysis Retrying with bit-precise analysis ### Bit-precise run ### 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/AutomizerMemDerefMemtrack.xml -i ../sv-benchmarks/c/list-simple/dll2c_remove_all_reverse.i -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Bitvector.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 valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash a81d76a671fec08918102c7898e8919d02b265d05707efa1508363dab4714d44 --- Real Ultimate output --- This is Ultimate 0.2.2-dev-ae00767 [2021-12-28 06:01:28,218 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-12-28 06:01:28,221 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-12-28 06:01:28,260 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-12-28 06:01:28,261 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-12-28 06:01:28,264 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-12-28 06:01:28,266 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-12-28 06:01:28,270 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-12-28 06:01:28,273 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-12-28 06:01:28,277 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-12-28 06:01:28,278 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-12-28 06:01:28,280 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-12-28 06:01:28,285 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-12-28 06:01:28,288 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-12-28 06:01:28,289 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-12-28 06:01:28,294 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-12-28 06:01:28,295 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-12-28 06:01:28,295 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-12-28 06:01:28,297 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-12-28 06:01:28,303 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-12-28 06:01:28,304 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-12-28 06:01:28,305 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-12-28 06:01:28,307 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-12-28 06:01:28,308 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-12-28 06:01:28,314 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-12-28 06:01:28,315 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-12-28 06:01:28,315 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-12-28 06:01:28,317 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-12-28 06:01:28,317 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-12-28 06:01:28,318 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-12-28 06:01:28,318 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-12-28 06:01:28,319 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-12-28 06:01:28,320 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-12-28 06:01:28,321 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-12-28 06:01:28,323 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-12-28 06:01:28,323 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-12-28 06:01:28,324 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-12-28 06:01:28,324 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-12-28 06:01:28,324 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-12-28 06:01:28,326 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-12-28 06:01:28,327 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-12-28 06:01:28,331 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Bitvector.epf [2021-12-28 06:01:28,368 INFO L113 SettingsManager]: Loading preferences was successful [2021-12-28 06:01:28,369 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-12-28 06:01:28,370 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-12-28 06:01:28,370 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-12-28 06:01:28,371 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-12-28 06:01:28,371 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-12-28 06:01:28,372 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-12-28 06:01:28,373 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-12-28 06:01:28,373 INFO L138 SettingsManager]: * Use SBE=true [2021-12-28 06:01:28,373 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-12-28 06:01:28,374 INFO L138 SettingsManager]: * sizeof long=4 [2021-12-28 06:01:28,374 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-12-28 06:01:28,375 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-12-28 06:01:28,375 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-12-28 06:01:28,375 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-12-28 06:01:28,375 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-12-28 06:01:28,376 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-12-28 06:01:28,376 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-12-28 06:01:28,376 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-12-28 06:01:28,376 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-12-28 06:01:28,377 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-12-28 06:01:28,377 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-12-28 06:01:28,377 INFO L138 SettingsManager]: * sizeof long double=12 [2021-12-28 06:01:28,377 INFO L138 SettingsManager]: * Use constant arrays=true [2021-12-28 06:01:28,378 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-12-28 06:01:28,378 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-12-28 06:01:28,378 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-12-28 06:01:28,378 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-28 06:01:28,379 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-12-28 06:01:28,379 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-12-28 06:01:28,379 INFO L138 SettingsManager]: * Trace refinement strategy=WOLF [2021-12-28 06:01:28,379 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-12-28 06:01:28,380 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-12-28 06:01:28,380 INFO L138 SettingsManager]: * Logic for external solver=AUFBV 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> a81d76a671fec08918102c7898e8919d02b265d05707efa1508363dab4714d44 [2021-12-28 06:01:28,706 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-12-28 06:01:28,725 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-12-28 06:01:28,728 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-12-28 06:01:28,729 INFO L271 PluginConnector]: Initializing CDTParser... [2021-12-28 06:01:28,731 INFO L275 PluginConnector]: CDTParser initialized [2021-12-28 06:01:28,733 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/list-simple/dll2c_remove_all_reverse.i [2021-12-28 06:01:28,796 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/94e86fe6f/a2aa8490bab644dc87e44810c2219515/FLAGce5562c6c [2021-12-28 06:01:29,240 INFO L306 CDTParser]: Found 1 translation units. [2021-12-28 06:01:29,241 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/list-simple/dll2c_remove_all_reverse.i [2021-12-28 06:01:29,256 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/94e86fe6f/a2aa8490bab644dc87e44810c2219515/FLAGce5562c6c [2021-12-28 06:01:29,594 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/94e86fe6f/a2aa8490bab644dc87e44810c2219515 [2021-12-28 06:01:29,596 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-12-28 06:01:29,598 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-12-28 06:01:29,601 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-12-28 06:01:29,601 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-12-28 06:01:29,612 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-12-28 06:01:29,613 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 28.12 06:01:29" (1/1) ... [2021-12-28 06:01:29,615 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3e1df44f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.12 06:01:29, skipping insertion in model container [2021-12-28 06:01:29,615 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 28.12 06:01:29" (1/1) ... [2021-12-28 06:01:29,621 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-12-28 06:01:29,664 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-12-28 06:01:29,955 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/list-simple/dll2c_remove_all_reverse.i[24177,24190] [2021-12-28 06:01:29,968 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-28 06:01:29,983 INFO L203 MainTranslator]: Completed pre-run [2021-12-28 06:01:30,037 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/list-simple/dll2c_remove_all_reverse.i[24177,24190] [2021-12-28 06:01:30,040 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-28 06:01:30,077 INFO L208 MainTranslator]: Completed translation [2021-12-28 06:01:30,078 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.12 06:01:30 WrapperNode [2021-12-28 06:01:30,078 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-12-28 06:01:30,080 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-12-28 06:01:30,080 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-12-28 06:01:30,080 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-12-28 06:01:30,086 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.12 06:01:30" (1/1) ... [2021-12-28 06:01:30,120 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.12 06:01:30" (1/1) ... [2021-12-28 06:01:30,151 INFO L137 Inliner]: procedures = 129, calls = 37, calls flagged for inlining = 5, calls inlined = 5, statements flattened = 112 [2021-12-28 06:01:30,152 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-12-28 06:01:30,153 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-12-28 06:01:30,153 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-12-28 06:01:30,153 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-12-28 06:01:30,160 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.12 06:01:30" (1/1) ... [2021-12-28 06:01:30,161 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.12 06:01:30" (1/1) ... [2021-12-28 06:01:30,176 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.12 06:01:30" (1/1) ... [2021-12-28 06:01:30,177 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.12 06:01:30" (1/1) ... [2021-12-28 06:01:30,184 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.12 06:01:30" (1/1) ... [2021-12-28 06:01:30,196 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.12 06:01:30" (1/1) ... [2021-12-28 06:01:30,203 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.12 06:01:30" (1/1) ... [2021-12-28 06:01:30,213 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-12-28 06:01:30,214 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-12-28 06:01:30,215 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-12-28 06:01:30,216 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-12-28 06:01:30,216 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.12 06:01:30" (1/1) ... [2021-12-28 06:01:30,222 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-28 06:01:30,234 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-28 06:01:30,248 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) [2021-12-28 06:01:30,271 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 [2021-12-28 06:01:30,287 INFO L130 BoogieDeclarations]: Found specification of procedure node_create [2021-12-28 06:01:30,287 INFO L138 BoogieDeclarations]: Found implementation of procedure node_create [2021-12-28 06:01:30,287 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-12-28 06:01:30,287 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-12-28 06:01:30,288 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-12-28 06:01:30,288 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-12-28 06:01:30,288 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-12-28 06:01:30,288 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-12-28 06:01:30,289 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE4 [2021-12-28 06:01:30,290 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2021-12-28 06:01:30,290 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-12-28 06:01:30,290 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-12-28 06:01:30,290 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-12-28 06:01:30,419 INFO L234 CfgBuilder]: Building ICFG [2021-12-28 06:01:30,421 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2021-12-28 06:01:30,903 INFO L275 CfgBuilder]: Performing block encoding [2021-12-28 06:01:30,910 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-12-28 06:01:30,910 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-12-28 06:01:30,913 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.12 06:01:30 BoogieIcfgContainer [2021-12-28 06:01:30,913 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-12-28 06:01:30,915 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-12-28 06:01:30,915 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-12-28 06:01:30,918 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-12-28 06:01:30,918 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 28.12 06:01:29" (1/3) ... [2021-12-28 06:01:30,919 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5d7fda4d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 28.12 06:01:30, skipping insertion in model container [2021-12-28 06:01:30,919 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.12 06:01:30" (2/3) ... [2021-12-28 06:01:30,920 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5d7fda4d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 28.12 06:01:30, skipping insertion in model container [2021-12-28 06:01:30,920 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.12 06:01:30" (3/3) ... [2021-12-28 06:01:30,921 INFO L111 eAbstractionObserver]: Analyzing ICFG dll2c_remove_all_reverse.i [2021-12-28 06:01:30,932 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-12-28 06:01:30,933 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 44 error locations. [2021-12-28 06:01:30,970 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-12-28 06:01:30,975 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=false, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, 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 [2021-12-28 06:01:30,976 INFO L340 AbstractCegarLoop]: Starting to check reachability of 44 error locations. [2021-12-28 06:01:30,987 INFO L276 IsEmpty]: Start isEmpty. Operand has 98 states, 50 states have (on average 2.04) internal successors, (102), 94 states have internal predecessors, (102), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-28 06:01:30,993 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-12-28 06:01:30,993 INFO L506 BasicCegarLoop]: Found error trace [2021-12-28 06:01:30,994 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-12-28 06:01:30,994 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting node_createErr0REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 40 more)] === [2021-12-28 06:01:30,998 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-28 06:01:30,999 INFO L85 PathProgramCache]: Analyzing trace with hash 893702386, now seen corresponding path program 1 times [2021-12-28 06:01:31,007 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-28 06:01:31,008 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [833988203] [2021-12-28 06:01:31,008 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-28 06:01:31,009 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-28 06:01:31,009 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-28 06:01:31,011 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-28 06:01:31,013 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-12-28 06:01:31,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-28 06:01:31,099 INFO L263 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 3 conjunts are in the unsatisfiable core [2021-12-28 06:01:31,104 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-28 06:01:31,174 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-28 06:01:31,188 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-28 06:01:31,188 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-28 06:01:31,189 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-28 06:01:31,189 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [833988203] [2021-12-28 06:01:31,190 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [833988203] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-28 06:01:31,190 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-28 06:01:31,190 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-28 06:01:31,192 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [989677457] [2021-12-28 06:01:31,193 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-28 06:01:31,196 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-28 06:01:31,197 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-28 06:01:31,222 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-28 06:01:31,223 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-28 06:01:31,225 INFO L87 Difference]: Start difference. First operand has 98 states, 50 states have (on average 2.04) internal successors, (102), 94 states have internal predecessors, (102), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Second operand has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-28 06:01:31,424 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-28 06:01:31,425 INFO L93 Difference]: Finished difference Result 95 states and 100 transitions. [2021-12-28 06:01:31,427 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-28 06:01:31,428 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2021-12-28 06:01:31,428 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-28 06:01:31,435 INFO L225 Difference]: With dead ends: 95 [2021-12-28 06:01:31,435 INFO L226 Difference]: Without dead ends: 92 [2021-12-28 06:01:31,437 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-28 06:01:31,439 INFO L933 BasicCegarLoop]: 91 mSDtfsCounter, 10 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 50 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 138 SdHoareTripleChecker+Invalid, 52 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 50 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-28 06:01:31,440 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 138 Invalid, 52 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 50 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-28 06:01:31,455 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2021-12-28 06:01:31,479 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 92. [2021-12-28 06:01:31,480 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 48 states have (on average 1.9166666666666667) internal successors, (92), 88 states have internal predecessors, (92), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-28 06:01:31,484 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 96 transitions. [2021-12-28 06:01:31,485 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 96 transitions. Word has length 6 [2021-12-28 06:01:31,485 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-28 06:01:31,485 INFO L470 AbstractCegarLoop]: Abstraction has 92 states and 96 transitions. [2021-12-28 06:01:31,486 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-28 06:01:31,486 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 96 transitions. [2021-12-28 06:01:31,486 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-12-28 06:01:31,486 INFO L506 BasicCegarLoop]: Found error trace [2021-12-28 06:01:31,486 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-12-28 06:01:31,498 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-12-28 06:01:31,695 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-28 06:01:31,696 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting node_createErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 40 more)] === [2021-12-28 06:01:31,696 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-28 06:01:31,696 INFO L85 PathProgramCache]: Analyzing trace with hash 893702387, now seen corresponding path program 1 times [2021-12-28 06:01:31,697 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-28 06:01:31,697 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [270284535] [2021-12-28 06:01:31,697 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-28 06:01:31,697 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-28 06:01:31,697 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-28 06:01:31,698 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-28 06:01:31,700 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-12-28 06:01:31,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-28 06:01:31,765 INFO L263 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 4 conjunts are in the unsatisfiable core [2021-12-28 06:01:31,769 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-28 06:01:31,796 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-28 06:01:31,827 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-28 06:01:31,827 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-28 06:01:31,827 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-28 06:01:31,828 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [270284535] [2021-12-28 06:01:31,828 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [270284535] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-28 06:01:31,828 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-28 06:01:31,828 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-28 06:01:31,828 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [496085824] [2021-12-28 06:01:31,828 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-28 06:01:31,829 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-28 06:01:31,829 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-28 06:01:31,829 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-28 06:01:31,830 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-28 06:01:31,830 INFO L87 Difference]: Start difference. First operand 92 states and 96 transitions. Second operand has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-28 06:01:31,994 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-28 06:01:31,995 INFO L93 Difference]: Finished difference Result 89 states and 93 transitions. [2021-12-28 06:01:31,995 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-28 06:01:31,995 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2021-12-28 06:01:31,996 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-28 06:01:31,996 INFO L225 Difference]: With dead ends: 89 [2021-12-28 06:01:31,997 INFO L226 Difference]: Without dead ends: 89 [2021-12-28 06:01:31,997 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-28 06:01:31,998 INFO L933 BasicCegarLoop]: 88 mSDtfsCounter, 5 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 140 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-28 06:01:31,999 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 140 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 39 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-28 06:01:31,999 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2021-12-28 06:01:32,008 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 89. [2021-12-28 06:01:32,011 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89 states, 48 states have (on average 1.8541666666666667) internal successors, (89), 85 states have internal predecessors, (89), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-28 06:01:32,013 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 93 transitions. [2021-12-28 06:01:32,014 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 93 transitions. Word has length 6 [2021-12-28 06:01:32,014 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-28 06:01:32,015 INFO L470 AbstractCegarLoop]: Abstraction has 89 states and 93 transitions. [2021-12-28 06:01:32,015 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-28 06:01:32,016 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 93 transitions. [2021-12-28 06:01:32,017 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-12-28 06:01:32,017 INFO L506 BasicCegarLoop]: Found error trace [2021-12-28 06:01:32,017 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-28 06:01:32,024 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-12-28 06:01:32,218 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-28 06:01:32,218 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 40 more)] === [2021-12-28 06:01:32,219 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-28 06:01:32,219 INFO L85 PathProgramCache]: Analyzing trace with hash -413883200, now seen corresponding path program 1 times [2021-12-28 06:01:32,220 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-28 06:01:32,220 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [746216016] [2021-12-28 06:01:32,220 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-28 06:01:32,220 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-28 06:01:32,220 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-28 06:01:32,221 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-28 06:01:32,222 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-12-28 06:01:32,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-28 06:01:32,295 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 4 conjunts are in the unsatisfiable core [2021-12-28 06:01:32,296 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-28 06:01:32,329 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-28 06:01:32,329 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-28 06:01:32,329 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-28 06:01:32,330 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [746216016] [2021-12-28 06:01:32,330 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [746216016] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-28 06:01:32,330 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-28 06:01:32,330 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-12-28 06:01:32,331 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [792593351] [2021-12-28 06:01:32,331 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-28 06:01:32,331 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-28 06:01:32,331 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-28 06:01:32,332 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-28 06:01:32,332 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-28 06:01:32,332 INFO L87 Difference]: Start difference. First operand 89 states and 93 transitions. Second operand has 3 states, 3 states have (on average 4.0) internal successors, (12), 3 states have internal predecessors, (12), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-28 06:01:32,343 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-28 06:01:32,343 INFO L93 Difference]: Finished difference Result 100 states and 106 transitions. [2021-12-28 06:01:32,344 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-28 06:01:32,344 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 3 states have internal predecessors, (12), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2021-12-28 06:01:32,344 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-28 06:01:32,345 INFO L225 Difference]: With dead ends: 100 [2021-12-28 06:01:32,345 INFO L226 Difference]: Without dead ends: 100 [2021-12-28 06:01:32,346 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-28 06:01:32,347 INFO L933 BasicCegarLoop]: 92 mSDtfsCounter, 10 mSDsluCounter, 87 mSDsCounter, 0 mSdLazyCounter, 5 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 179 SdHoareTripleChecker+Invalid, 5 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 5 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-28 06:01:32,347 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 179 Invalid, 5 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 5 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-28 06:01:32,348 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2021-12-28 06:01:32,354 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 90. [2021-12-28 06:01:32,354 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 49 states have (on average 1.836734693877551) internal successors, (90), 86 states have internal predecessors, (90), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-28 06:01:32,355 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 94 transitions. [2021-12-28 06:01:32,356 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 94 transitions. Word has length 14 [2021-12-28 06:01:32,356 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-28 06:01:32,356 INFO L470 AbstractCegarLoop]: Abstraction has 90 states and 94 transitions. [2021-12-28 06:01:32,356 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 3 states have internal predecessors, (12), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-28 06:01:32,357 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 94 transitions. [2021-12-28 06:01:32,357 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-12-28 06:01:32,357 INFO L506 BasicCegarLoop]: Found error trace [2021-12-28 06:01:32,358 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-28 06:01:32,371 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-12-28 06:01:32,569 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-28 06:01:32,570 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 40 more)] === [2021-12-28 06:01:32,570 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-28 06:01:32,570 INFO L85 PathProgramCache]: Analyzing trace with hash 1410538016, now seen corresponding path program 1 times [2021-12-28 06:01:32,570 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-28 06:01:32,571 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [329998863] [2021-12-28 06:01:32,571 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-28 06:01:32,571 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-28 06:01:32,571 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-28 06:01:32,572 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-28 06:01:32,574 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-12-28 06:01:32,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-28 06:01:32,678 INFO L263 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 6 conjunts are in the unsatisfiable core [2021-12-28 06:01:32,680 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-28 06:01:32,718 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-28 06:01:32,771 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-28 06:01:32,771 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-28 06:01:32,771 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-28 06:01:32,776 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [329998863] [2021-12-28 06:01:32,777 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [329998863] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-28 06:01:32,777 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-28 06:01:32,777 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-12-28 06:01:32,777 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1822977795] [2021-12-28 06:01:32,777 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-28 06:01:32,778 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-12-28 06:01:32,778 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-28 06:01:32,779 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-12-28 06:01:32,780 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-12-28 06:01:32,780 INFO L87 Difference]: Start difference. First operand 90 states and 94 transitions. Second operand has 6 states, 5 states have (on average 4.0) internal successors, (20), 5 states have internal predecessors, (20), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-12-28 06:01:33,129 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-28 06:01:33,129 INFO L93 Difference]: Finished difference Result 127 states and 134 transitions. [2021-12-28 06:01:33,130 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-28 06:01:33,130 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 4.0) internal successors, (20), 5 states have internal predecessors, (20), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 24 [2021-12-28 06:01:33,130 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-28 06:01:33,132 INFO L225 Difference]: With dead ends: 127 [2021-12-28 06:01:33,132 INFO L226 Difference]: Without dead ends: 127 [2021-12-28 06:01:33,133 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-12-28 06:01:33,133 INFO L933 BasicCegarLoop]: 63 mSDtfsCounter, 56 mSDsluCounter, 169 mSDsCounter, 0 mSdLazyCounter, 213 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 56 SdHoareTripleChecker+Valid, 232 SdHoareTripleChecker+Invalid, 213 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 213 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-28 06:01:33,134 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [56 Valid, 232 Invalid, 213 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 213 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-12-28 06:01:33,135 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2021-12-28 06:01:33,139 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 89. [2021-12-28 06:01:33,139 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89 states, 49 states have (on average 1.816326530612245) internal successors, (89), 85 states have internal predecessors, (89), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-28 06:01:33,140 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 93 transitions. [2021-12-28 06:01:33,140 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 93 transitions. Word has length 24 [2021-12-28 06:01:33,141 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-28 06:01:33,141 INFO L470 AbstractCegarLoop]: Abstraction has 89 states and 93 transitions. [2021-12-28 06:01:33,141 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 4.0) internal successors, (20), 5 states have internal predecessors, (20), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-12-28 06:01:33,141 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 93 transitions. [2021-12-28 06:01:33,142 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-12-28 06:01:33,142 INFO L506 BasicCegarLoop]: Found error trace [2021-12-28 06:01:33,142 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-28 06:01:33,154 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2021-12-28 06:01:33,352 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-28 06:01:33,352 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 40 more)] === [2021-12-28 06:01:33,353 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-28 06:01:33,353 INFO L85 PathProgramCache]: Analyzing trace with hash 1410538017, now seen corresponding path program 1 times [2021-12-28 06:01:33,353 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-28 06:01:33,354 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1204282152] [2021-12-28 06:01:33,354 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-28 06:01:33,354 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-28 06:01:33,354 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-28 06:01:33,356 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-28 06:01:33,358 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-12-28 06:01:33,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-28 06:01:33,484 INFO L263 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 10 conjunts are in the unsatisfiable core [2021-12-28 06:01:33,488 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-28 06:01:33,530 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-28 06:01:33,635 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-28 06:01:33,635 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-28 06:01:33,636 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-28 06:01:33,636 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1204282152] [2021-12-28 06:01:33,636 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1204282152] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-28 06:01:33,636 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-28 06:01:33,636 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-12-28 06:01:33,636 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2114863080] [2021-12-28 06:01:33,637 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-28 06:01:33,637 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-12-28 06:01:33,637 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-28 06:01:33,638 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-12-28 06:01:33,638 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-12-28 06:01:33,638 INFO L87 Difference]: Start difference. First operand 89 states and 93 transitions. Second operand has 6 states, 5 states have (on average 4.0) internal successors, (20), 5 states have internal predecessors, (20), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-12-28 06:01:33,944 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-28 06:01:33,944 INFO L93 Difference]: Finished difference Result 89 states and 94 transitions. [2021-12-28 06:01:33,945 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-28 06:01:33,945 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 4.0) internal successors, (20), 5 states have internal predecessors, (20), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 24 [2021-12-28 06:01:33,945 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-28 06:01:33,946 INFO L225 Difference]: With dead ends: 89 [2021-12-28 06:01:33,946 INFO L226 Difference]: Without dead ends: 89 [2021-12-28 06:01:33,946 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-12-28 06:01:33,947 INFO L933 BasicCegarLoop]: 58 mSDtfsCounter, 78 mSDsluCounter, 156 mSDsCounter, 0 mSdLazyCounter, 168 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 78 SdHoareTripleChecker+Valid, 214 SdHoareTripleChecker+Invalid, 168 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 168 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-28 06:01:33,947 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [78 Valid, 214 Invalid, 168 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 168 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-12-28 06:01:33,948 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2021-12-28 06:01:33,951 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 88. [2021-12-28 06:01:33,952 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 49 states have (on average 1.7959183673469388) internal successors, (88), 84 states have internal predecessors, (88), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-28 06:01:33,952 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 92 transitions. [2021-12-28 06:01:33,953 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 92 transitions. Word has length 24 [2021-12-28 06:01:33,953 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-28 06:01:33,953 INFO L470 AbstractCegarLoop]: Abstraction has 88 states and 92 transitions. [2021-12-28 06:01:33,953 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 4.0) internal successors, (20), 5 states have internal predecessors, (20), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-12-28 06:01:33,953 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 92 transitions. [2021-12-28 06:01:33,954 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-12-28 06:01:33,954 INFO L506 BasicCegarLoop]: Found error trace [2021-12-28 06:01:33,954 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-28 06:01:33,981 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2021-12-28 06:01:34,162 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-28 06:01:34,162 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 40 more)] === [2021-12-28 06:01:34,163 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-28 06:01:34,163 INFO L85 PathProgramCache]: Analyzing trace with hash -1682632447, now seen corresponding path program 1 times [2021-12-28 06:01:34,163 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-28 06:01:34,163 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1329790267] [2021-12-28 06:01:34,163 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-28 06:01:34,164 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-28 06:01:34,164 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-28 06:01:34,165 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-28 06:01:34,167 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2021-12-28 06:01:34,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-28 06:01:34,303 INFO L263 TraceCheckSpWp]: Trace formula consists of 180 conjuncts, 10 conjunts are in the unsatisfiable core [2021-12-28 06:01:34,304 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-28 06:01:34,318 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-28 06:01:34,591 INFO L353 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2021-12-28 06:01:34,593 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 18 treesize of output 25 [2021-12-28 06:01:34,614 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-28 06:01:34,614 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-28 06:01:34,912 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-28 06:01:34,913 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-28 06:01:34,913 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1329790267] [2021-12-28 06:01:34,913 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1329790267] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-28 06:01:34,913 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-28 06:01:34,913 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2021-12-28 06:01:34,913 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [160460679] [2021-12-28 06:01:34,914 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-28 06:01:34,914 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-12-28 06:01:34,914 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-28 06:01:34,915 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-12-28 06:01:34,915 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-12-28 06:01:34,915 INFO L87 Difference]: Start difference. First operand 88 states and 92 transitions. Second operand has 9 states, 8 states have (on average 3.625) internal successors, (29), 7 states have internal predecessors, (29), 2 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-12-28 06:01:35,278 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-28 06:01:35,278 INFO L93 Difference]: Finished difference Result 132 states and 140 transitions. [2021-12-28 06:01:35,278 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-12-28 06:01:35,279 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 3.625) internal successors, (29), 7 states have internal predecessors, (29), 2 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 26 [2021-12-28 06:01:35,279 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-28 06:01:35,280 INFO L225 Difference]: With dead ends: 132 [2021-12-28 06:01:35,280 INFO L226 Difference]: Without dead ends: 132 [2021-12-28 06:01:35,280 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 40 SyntacticMatches, 3 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-12-28 06:01:35,281 INFO L933 BasicCegarLoop]: 61 mSDtfsCounter, 41 mSDsluCounter, 277 mSDsCounter, 0 mSdLazyCounter, 241 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 41 SdHoareTripleChecker+Valid, 338 SdHoareTripleChecker+Invalid, 387 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 241 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 142 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-28 06:01:35,281 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [41 Valid, 338 Invalid, 387 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 241 Invalid, 0 Unknown, 142 Unchecked, 0.3s Time] [2021-12-28 06:01:35,282 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2021-12-28 06:01:35,290 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 93. [2021-12-28 06:01:35,291 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 53 states have (on average 1.7735849056603774) internal successors, (94), 88 states have internal predecessors, (94), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-12-28 06:01:35,292 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 100 transitions. [2021-12-28 06:01:35,292 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 100 transitions. Word has length 26 [2021-12-28 06:01:35,292 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-28 06:01:35,292 INFO L470 AbstractCegarLoop]: Abstraction has 93 states and 100 transitions. [2021-12-28 06:01:35,292 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 3.625) internal successors, (29), 7 states have internal predecessors, (29), 2 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-12-28 06:01:35,292 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 100 transitions. [2021-12-28 06:01:35,293 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-12-28 06:01:35,293 INFO L506 BasicCegarLoop]: Found error trace [2021-12-28 06:01:35,293 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-28 06:01:35,331 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (7)] Forceful destruction successful, exit code 0 [2021-12-28 06:01:35,505 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-28 06:01:35,506 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 40 more)] === [2021-12-28 06:01:35,506 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-28 06:01:35,506 INFO L85 PathProgramCache]: Analyzing trace with hash -1682632446, now seen corresponding path program 1 times [2021-12-28 06:01:35,507 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-28 06:01:35,507 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1371671473] [2021-12-28 06:01:35,507 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-28 06:01:35,507 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-28 06:01:35,507 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-28 06:01:35,508 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-28 06:01:35,509 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2021-12-28 06:01:35,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-28 06:01:35,651 INFO L263 TraceCheckSpWp]: Trace formula consists of 180 conjuncts, 18 conjunts are in the unsatisfiable core [2021-12-28 06:01:35,654 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-28 06:01:35,670 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-28 06:01:35,677 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-28 06:01:36,002 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-28 06:01:36,005 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-28 06:01:36,016 INFO L353 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-28 06:01:36,016 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 12 treesize of output 12 [2021-12-28 06:01:36,056 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-28 06:01:36,057 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-28 06:01:36,291 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-28 06:01:36,292 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1371671473] [2021-12-28 06:01:36,292 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1371671473] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-28 06:01:36,292 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1240233742] [2021-12-28 06:01:36,292 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-28 06:01:36,292 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-28 06:01:36,292 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2021-12-28 06:01:36,295 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-12-28 06:01:36,298 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (9)] Waiting until timeout for monitored process [2021-12-28 06:01:36,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-28 06:01:36,491 INFO L263 TraceCheckSpWp]: Trace formula consists of 180 conjuncts, 18 conjunts are in the unsatisfiable core [2021-12-28 06:01:36,493 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-28 06:01:36,509 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-28 06:01:36,513 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-28 06:01:38,826 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-28 06:01:38,827 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-28 06:01:38,836 INFO L353 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-28 06:01:38,837 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 12 treesize of output 12 [2021-12-28 06:01:38,875 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-28 06:01:38,875 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-28 06:01:41,160 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1240233742] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-28 06:01:41,160 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-28 06:01:41,160 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 8 [2021-12-28 06:01:41,160 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1332028252] [2021-12-28 06:01:41,160 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-28 06:01:41,160 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-12-28 06:01:41,161 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-28 06:01:41,161 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-12-28 06:01:41,161 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2021-12-28 06:01:41,161 INFO L87 Difference]: Start difference. First operand 93 states and 100 transitions. Second operand has 9 states, 8 states have (on average 2.75) internal successors, (22), 7 states have internal predecessors, (22), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-28 06:01:41,676 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-28 06:01:41,677 INFO L93 Difference]: Finished difference Result 95 states and 101 transitions. [2021-12-28 06:01:41,677 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-12-28 06:01:41,677 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 2.75) internal successors, (22), 7 states have internal predecessors, (22), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 26 [2021-12-28 06:01:41,678 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-28 06:01:41,678 INFO L225 Difference]: With dead ends: 95 [2021-12-28 06:01:41,678 INFO L226 Difference]: Without dead ends: 95 [2021-12-28 06:01:41,678 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 49 SyntacticMatches, 2 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=31, Invalid=125, Unknown=0, NotChecked=0, Total=156 [2021-12-28 06:01:41,679 INFO L933 BasicCegarLoop]: 81 mSDtfsCounter, 3 mSDsluCounter, 208 mSDsCounter, 0 mSdLazyCounter, 271 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 289 SdHoareTripleChecker+Invalid, 331 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 271 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 56 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-12-28 06:01:41,679 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 289 Invalid, 331 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 271 Invalid, 0 Unknown, 56 Unchecked, 0.4s Time] [2021-12-28 06:01:41,680 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2021-12-28 06:01:41,683 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 93. [2021-12-28 06:01:41,684 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 53 states have (on average 1.7547169811320755) internal successors, (93), 88 states have internal predecessors, (93), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-12-28 06:01:41,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 99 transitions. [2021-12-28 06:01:41,684 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 99 transitions. Word has length 26 [2021-12-28 06:01:41,685 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-28 06:01:41,685 INFO L470 AbstractCegarLoop]: Abstraction has 93 states and 99 transitions. [2021-12-28 06:01:41,685 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 2.75) internal successors, (22), 7 states have internal predecessors, (22), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-28 06:01:41,685 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 99 transitions. [2021-12-28 06:01:41,685 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-12-28 06:01:41,685 INFO L506 BasicCegarLoop]: Found error trace [2021-12-28 06:01:41,686 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-28 06:01:41,694 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (9)] Forceful destruction successful, exit code 0 [2021-12-28 06:01:41,894 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (8)] Forceful destruction successful, exit code 0 [2021-12-28 06:01:42,086 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-28 06:01:42,087 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 40 more)] === [2021-12-28 06:01:42,087 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-28 06:01:42,087 INFO L85 PathProgramCache]: Analyzing trace with hash -2101924137, now seen corresponding path program 1 times [2021-12-28 06:01:42,088 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-28 06:01:42,088 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [768504734] [2021-12-28 06:01:42,088 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-28 06:01:42,088 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-28 06:01:42,088 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-28 06:01:42,089 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-28 06:01:42,090 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (10)] Waiting until timeout for monitored process [2021-12-28 06:01:42,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-28 06:01:42,194 INFO L263 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 5 conjunts are in the unsatisfiable core [2021-12-28 06:01:42,196 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-28 06:01:42,264 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-28 06:01:42,264 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-28 06:01:42,336 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-28 06:01:42,336 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-28 06:01:42,336 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [768504734] [2021-12-28 06:01:42,336 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [768504734] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-28 06:01:42,336 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-28 06:01:42,337 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 6 [2021-12-28 06:01:42,337 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1456377758] [2021-12-28 06:01:42,337 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-28 06:01:42,337 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-12-28 06:01:42,337 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-28 06:01:42,338 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-12-28 06:01:42,338 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-12-28 06:01:42,338 INFO L87 Difference]: Start difference. First operand 93 states and 99 transitions. Second operand has 6 states, 6 states have (on average 4.0) internal successors, (24), 5 states have internal predecessors, (24), 2 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-28 06:01:42,477 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-28 06:01:42,477 INFO L93 Difference]: Finished difference Result 94 states and 99 transitions. [2021-12-28 06:01:42,478 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-28 06:01:42,478 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.0) internal successors, (24), 5 states have internal predecessors, (24), 2 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 28 [2021-12-28 06:01:42,478 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-28 06:01:42,479 INFO L225 Difference]: With dead ends: 94 [2021-12-28 06:01:42,479 INFO L226 Difference]: Without dead ends: 94 [2021-12-28 06:01:42,479 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-12-28 06:01:42,480 INFO L933 BasicCegarLoop]: 83 mSDtfsCounter, 4 mSDsluCounter, 316 mSDsCounter, 0 mSdLazyCounter, 49 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 399 SdHoareTripleChecker+Invalid, 49 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 49 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-28 06:01:42,480 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4 Valid, 399 Invalid, 49 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 49 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-28 06:01:42,481 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2021-12-28 06:01:42,484 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 93. [2021-12-28 06:01:42,485 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 53 states have (on average 1.7358490566037736) internal successors, (92), 88 states have internal predecessors, (92), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-12-28 06:01:42,486 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 98 transitions. [2021-12-28 06:01:42,486 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 98 transitions. Word has length 28 [2021-12-28 06:01:42,486 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-28 06:01:42,486 INFO L470 AbstractCegarLoop]: Abstraction has 93 states and 98 transitions. [2021-12-28 06:01:42,487 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 4.0) internal successors, (24), 5 states have internal predecessors, (24), 2 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-28 06:01:42,487 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 98 transitions. [2021-12-28 06:01:42,487 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-12-28 06:01:42,488 INFO L506 BasicCegarLoop]: Found error trace [2021-12-28 06:01:42,488 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-28 06:01:42,502 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (10)] Forceful destruction successful, exit code 0 [2021-12-28 06:01:42,697 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-28 06:01:42,698 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 40 more)] === [2021-12-28 06:01:42,698 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-28 06:01:42,698 INFO L85 PathProgramCache]: Analyzing trace with hash -739919470, now seen corresponding path program 1 times [2021-12-28 06:01:42,698 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-28 06:01:42,698 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1227098257] [2021-12-28 06:01:42,698 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-28 06:01:42,699 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-28 06:01:42,699 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-28 06:01:42,700 INFO L229 MonitoredProcess]: Starting monitored process 11 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-28 06:01:42,703 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (11)] Waiting until timeout for monitored process [2021-12-28 06:01:42,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-28 06:01:42,809 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 3 conjunts are in the unsatisfiable core [2021-12-28 06:01:42,810 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-28 06:01:42,864 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-12-28 06:01:42,864 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-28 06:01:42,881 INFO L353 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2021-12-28 06:01:42,882 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 12 treesize of output 11 [2021-12-28 06:01:42,922 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-12-28 06:01:42,922 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-28 06:01:42,923 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1227098257] [2021-12-28 06:01:42,923 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1227098257] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-28 06:01:42,923 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-28 06:01:42,923 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3] total 3 [2021-12-28 06:01:42,923 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1841880179] [2021-12-28 06:01:42,923 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-28 06:01:42,924 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-12-28 06:01:42,925 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-28 06:01:42,925 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-12-28 06:01:42,925 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-12-28 06:01:42,925 INFO L87 Difference]: Start difference. First operand 93 states and 98 transitions. Second operand has 4 states, 3 states have (on average 6.0) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-28 06:01:43,155 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-28 06:01:43,155 INFO L93 Difference]: Finished difference Result 135 states and 144 transitions. [2021-12-28 06:01:43,156 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-12-28 06:01:43,156 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 6.0) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 29 [2021-12-28 06:01:43,156 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-28 06:01:43,157 INFO L225 Difference]: With dead ends: 135 [2021-12-28 06:01:43,157 INFO L226 Difference]: Without dead ends: 135 [2021-12-28 06:01:43,157 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-12-28 06:01:43,158 INFO L933 BasicCegarLoop]: 71 mSDtfsCounter, 45 mSDsluCounter, 103 mSDsCounter, 0 mSdLazyCounter, 101 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 174 SdHoareTripleChecker+Invalid, 102 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 101 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-28 06:01:43,158 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [45 Valid, 174 Invalid, 102 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 101 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-28 06:01:43,158 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2021-12-28 06:01:43,163 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 96. [2021-12-28 06:01:43,164 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 96 states, 56 states have (on average 1.7321428571428572) internal successors, (97), 91 states have internal predecessors, (97), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-12-28 06:01:43,165 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 103 transitions. [2021-12-28 06:01:43,165 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 103 transitions. Word has length 29 [2021-12-28 06:01:43,165 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-28 06:01:43,165 INFO L470 AbstractCegarLoop]: Abstraction has 96 states and 103 transitions. [2021-12-28 06:01:43,166 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 6.0) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-28 06:01:43,166 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 103 transitions. [2021-12-28 06:01:43,166 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-12-28 06:01:43,166 INFO L506 BasicCegarLoop]: Found error trace [2021-12-28 06:01:43,167 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-28 06:01:43,178 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (11)] Forceful destruction successful, exit code 0 [2021-12-28 06:01:43,375 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-28 06:01:43,375 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 40 more)] === [2021-12-28 06:01:43,376 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-28 06:01:43,376 INFO L85 PathProgramCache]: Analyzing trace with hash -739919469, now seen corresponding path program 1 times [2021-12-28 06:01:43,376 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-28 06:01:43,376 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1249705162] [2021-12-28 06:01:43,376 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-28 06:01:43,376 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-28 06:01:43,377 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-28 06:01:43,378 INFO L229 MonitoredProcess]: Starting monitored process 12 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-28 06:01:43,381 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (12)] Waiting until timeout for monitored process [2021-12-28 06:01:43,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-28 06:01:43,532 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 8 conjunts are in the unsatisfiable core [2021-12-28 06:01:43,534 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-28 06:01:43,672 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-28 06:01:43,672 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-28 06:01:43,745 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-28 06:01:43,746 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 22 treesize of output 26 [2021-12-28 06:01:44,221 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-28 06:01:44,222 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-28 06:01:44,222 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1249705162] [2021-12-28 06:01:44,222 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1249705162] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-28 06:01:44,222 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-28 06:01:44,222 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 11 [2021-12-28 06:01:44,222 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [488947729] [2021-12-28 06:01:44,223 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-28 06:01:44,223 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-12-28 06:01:44,223 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-28 06:01:44,224 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-12-28 06:01:44,224 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=106, Unknown=0, NotChecked=0, Total=132 [2021-12-28 06:01:44,224 INFO L87 Difference]: Start difference. First operand 96 states and 103 transitions. Second operand has 12 states, 11 states have (on average 3.727272727272727) internal successors, (41), 10 states have internal predecessors, (41), 3 states have call successors, (3), 1 states have call predecessors, (3), 3 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2021-12-28 06:01:45,162 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-28 06:01:45,162 INFO L93 Difference]: Finished difference Result 160 states and 168 transitions. [2021-12-28 06:01:45,163 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-12-28 06:01:45,164 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 3.727272727272727) internal successors, (41), 10 states have internal predecessors, (41), 3 states have call successors, (3), 1 states have call predecessors, (3), 3 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) Word has length 29 [2021-12-28 06:01:45,164 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-28 06:01:45,164 INFO L225 Difference]: With dead ends: 160 [2021-12-28 06:01:45,164 INFO L226 Difference]: Without dead ends: 160 [2021-12-28 06:01:45,165 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 46 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2021-12-28 06:01:45,165 INFO L933 BasicCegarLoop]: 61 mSDtfsCounter, 136 mSDsluCounter, 349 mSDsCounter, 0 mSdLazyCounter, 268 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 136 SdHoareTripleChecker+Valid, 410 SdHoareTripleChecker+Invalid, 269 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 268 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-12-28 06:01:45,165 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [136 Valid, 410 Invalid, 269 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 268 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-12-28 06:01:45,166 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2021-12-28 06:01:45,168 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 96. [2021-12-28 06:01:45,169 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 96 states, 56 states have (on average 1.7142857142857142) internal successors, (96), 91 states have internal predecessors, (96), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-12-28 06:01:45,169 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 102 transitions. [2021-12-28 06:01:45,169 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 102 transitions. Word has length 29 [2021-12-28 06:01:45,170 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-28 06:01:45,170 INFO L470 AbstractCegarLoop]: Abstraction has 96 states and 102 transitions. [2021-12-28 06:01:45,170 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 3.727272727272727) internal successors, (41), 10 states have internal predecessors, (41), 3 states have call successors, (3), 1 states have call predecessors, (3), 3 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2021-12-28 06:01:45,170 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 102 transitions. [2021-12-28 06:01:45,170 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-12-28 06:01:45,170 INFO L506 BasicCegarLoop]: Found error trace [2021-12-28 06:01:45,171 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-28 06:01:45,182 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (12)] Forceful destruction successful, exit code 0 [2021-12-28 06:01:45,379 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-28 06:01:45,380 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr6REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 40 more)] === [2021-12-28 06:01:45,380 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-28 06:01:45,380 INFO L85 PathProgramCache]: Analyzing trace with hash -1462667085, now seen corresponding path program 1 times [2021-12-28 06:01:45,380 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-28 06:01:45,381 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1663501276] [2021-12-28 06:01:45,381 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-28 06:01:45,381 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-28 06:01:45,381 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-28 06:01:45,382 INFO L229 MonitoredProcess]: Starting monitored process 13 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-28 06:01:45,383 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (13)] Waiting until timeout for monitored process [2021-12-28 06:01:45,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-28 06:01:45,531 INFO L263 TraceCheckSpWp]: Trace formula consists of 210 conjuncts, 7 conjunts are in the unsatisfiable core [2021-12-28 06:01:45,534 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-28 06:01:45,559 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-28 06:01:45,625 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-28 06:01:45,625 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-28 06:01:45,626 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-28 06:01:45,626 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1663501276] [2021-12-28 06:01:45,626 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1663501276] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-28 06:01:45,626 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-28 06:01:45,626 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-12-28 06:01:45,626 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [139649709] [2021-12-28 06:01:45,626 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-28 06:01:45,626 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-12-28 06:01:45,626 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-28 06:01:45,627 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-12-28 06:01:45,627 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-12-28 06:01:45,627 INFO L87 Difference]: Start difference. First operand 96 states and 102 transitions. Second operand has 7 states, 6 states have (on average 4.333333333333333) internal successors, (26), 6 states have internal predecessors, (26), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-12-28 06:01:46,053 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-28 06:01:46,054 INFO L93 Difference]: Finished difference Result 133 states and 141 transitions. [2021-12-28 06:01:46,054 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-12-28 06:01:46,054 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 4.333333333333333) internal successors, (26), 6 states have internal predecessors, (26), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 30 [2021-12-28 06:01:46,054 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-28 06:01:46,055 INFO L225 Difference]: With dead ends: 133 [2021-12-28 06:01:46,055 INFO L226 Difference]: Without dead ends: 133 [2021-12-28 06:01:46,056 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-12-28 06:01:46,056 INFO L933 BasicCegarLoop]: 61 mSDtfsCounter, 94 mSDsluCounter, 198 mSDsCounter, 0 mSdLazyCounter, 260 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 94 SdHoareTripleChecker+Valid, 259 SdHoareTripleChecker+Invalid, 262 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 260 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-12-28 06:01:46,057 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [94 Valid, 259 Invalid, 262 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 260 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-12-28 06:01:46,057 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2021-12-28 06:01:46,059 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 95. [2021-12-28 06:01:46,059 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 56 states have (on average 1.6964285714285714) internal successors, (95), 90 states have internal predecessors, (95), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-12-28 06:01:46,060 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 101 transitions. [2021-12-28 06:01:46,060 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 101 transitions. Word has length 30 [2021-12-28 06:01:46,061 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-28 06:01:46,061 INFO L470 AbstractCegarLoop]: Abstraction has 95 states and 101 transitions. [2021-12-28 06:01:46,061 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 4.333333333333333) internal successors, (26), 6 states have internal predecessors, (26), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-12-28 06:01:46,061 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 101 transitions. [2021-12-28 06:01:46,062 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-12-28 06:01:46,062 INFO L506 BasicCegarLoop]: Found error trace [2021-12-28 06:01:46,062 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-28 06:01:46,070 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (13)] Forceful destruction successful, exit code 0 [2021-12-28 06:01:46,267 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-28 06:01:46,267 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 40 more)] === [2021-12-28 06:01:46,268 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-28 06:01:46,268 INFO L85 PathProgramCache]: Analyzing trace with hash -1462667084, now seen corresponding path program 1 times [2021-12-28 06:01:46,269 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-28 06:01:46,269 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [863923633] [2021-12-28 06:01:46,269 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-28 06:01:46,269 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-28 06:01:46,269 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-28 06:01:46,270 INFO L229 MonitoredProcess]: Starting monitored process 14 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-28 06:01:46,272 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (14)] Waiting until timeout for monitored process [2021-12-28 06:01:46,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-28 06:01:46,402 INFO L263 TraceCheckSpWp]: Trace formula consists of 210 conjuncts, 12 conjunts are in the unsatisfiable core [2021-12-28 06:01:46,404 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-28 06:01:46,429 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-28 06:01:46,561 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-28 06:01:46,561 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-28 06:01:46,562 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-28 06:01:46,562 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [863923633] [2021-12-28 06:01:46,562 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [863923633] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-28 06:01:46,562 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-28 06:01:46,562 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-12-28 06:01:46,562 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1558331956] [2021-12-28 06:01:46,562 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-28 06:01:46,562 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-12-28 06:01:46,563 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-28 06:01:46,563 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-12-28 06:01:46,563 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-12-28 06:01:46,563 INFO L87 Difference]: Start difference. First operand 95 states and 101 transitions. Second operand has 7 states, 6 states have (on average 4.333333333333333) internal successors, (26), 6 states have internal predecessors, (26), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-12-28 06:01:46,927 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-28 06:01:46,927 INFO L93 Difference]: Finished difference Result 94 states and 100 transitions. [2021-12-28 06:01:46,927 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-12-28 06:01:46,928 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 4.333333333333333) internal successors, (26), 6 states have internal predecessors, (26), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 30 [2021-12-28 06:01:46,928 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-28 06:01:46,928 INFO L225 Difference]: With dead ends: 94 [2021-12-28 06:01:46,929 INFO L226 Difference]: Without dead ends: 94 [2021-12-28 06:01:46,929 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-12-28 06:01:46,929 INFO L933 BasicCegarLoop]: 56 mSDtfsCounter, 138 mSDsluCounter, 154 mSDsCounter, 0 mSdLazyCounter, 188 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 138 SdHoareTripleChecker+Valid, 210 SdHoareTripleChecker+Invalid, 188 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 188 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-28 06:01:46,929 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [138 Valid, 210 Invalid, 188 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 188 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-12-28 06:01:46,930 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2021-12-28 06:01:46,931 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 94. [2021-12-28 06:01:46,932 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 94 states, 56 states have (on average 1.6785714285714286) internal successors, (94), 89 states have internal predecessors, (94), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-12-28 06:01:46,932 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 100 transitions. [2021-12-28 06:01:46,932 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 100 transitions. Word has length 30 [2021-12-28 06:01:46,933 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-28 06:01:46,933 INFO L470 AbstractCegarLoop]: Abstraction has 94 states and 100 transitions. [2021-12-28 06:01:46,933 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 4.333333333333333) internal successors, (26), 6 states have internal predecessors, (26), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-12-28 06:01:46,933 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 100 transitions. [2021-12-28 06:01:46,934 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-12-28 06:01:46,934 INFO L506 BasicCegarLoop]: Found error trace [2021-12-28 06:01:46,934 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-28 06:01:46,950 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (14)] Forceful destruction successful, exit code 0 [2021-12-28 06:01:47,145 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-28 06:01:47,145 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr8REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 40 more)] === [2021-12-28 06:01:47,145 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-28 06:01:47,146 INFO L85 PathProgramCache]: Analyzing trace with hash 2100539894, now seen corresponding path program 1 times [2021-12-28 06:01:47,146 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-28 06:01:47,146 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [982024484] [2021-12-28 06:01:47,146 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-28 06:01:47,146 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-28 06:01:47,147 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-28 06:01:47,148 INFO L229 MonitoredProcess]: Starting monitored process 15 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-28 06:01:47,150 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (15)] Waiting until timeout for monitored process [2021-12-28 06:01:47,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-28 06:01:47,314 INFO L263 TraceCheckSpWp]: Trace formula consists of 233 conjuncts, 13 conjunts are in the unsatisfiable core [2021-12-28 06:01:47,316 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-28 06:01:47,322 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-28 06:01:47,448 INFO L353 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2021-12-28 06:01:47,448 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 18 treesize of output 25 [2021-12-28 06:01:49,511 INFO L353 Elim1Store]: treesize reduction 12, result has 40.0 percent of original size [2021-12-28 06:01:49,512 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 12 treesize of output 17 [2021-12-28 06:01:49,546 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 0 refuted. 7 times theorem prover too weak. 2 trivial. 0 not checked. [2021-12-28 06:01:49,546 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-28 06:01:49,863 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-12-28 06:01:49,863 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-28 06:01:49,863 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [982024484] [2021-12-28 06:01:49,863 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [982024484] provided 1 perfect and 1 imperfect interpolant sequences [2021-12-28 06:01:49,863 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-12-28 06:01:49,863 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [6] total 7 [2021-12-28 06:01:49,864 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1431254014] [2021-12-28 06:01:49,864 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-28 06:01:49,864 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-12-28 06:01:49,864 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-28 06:01:49,864 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-12-28 06:01:49,864 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=39, Unknown=1, NotChecked=0, Total=56 [2021-12-28 06:01:49,865 INFO L87 Difference]: Start difference. First operand 94 states and 100 transitions. Second operand has 5 states, 4 states have (on average 5.75) internal successors, (23), 5 states have internal predecessors, (23), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-12-28 06:01:50,050 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-28 06:01:50,050 INFO L93 Difference]: Finished difference Result 124 states and 132 transitions. [2021-12-28 06:01:50,051 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-28 06:01:50,051 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 5.75) internal successors, (23), 5 states have internal predecessors, (23), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 34 [2021-12-28 06:01:50,051 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-28 06:01:50,052 INFO L225 Difference]: With dead ends: 124 [2021-12-28 06:01:50,052 INFO L226 Difference]: Without dead ends: 124 [2021-12-28 06:01:50,052 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 53 SyntacticMatches, 7 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=20, Invalid=51, Unknown=1, NotChecked=0, Total=72 [2021-12-28 06:01:50,052 INFO L933 BasicCegarLoop]: 53 mSDtfsCounter, 105 mSDsluCounter, 84 mSDsCounter, 0 mSdLazyCounter, 92 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 105 SdHoareTripleChecker+Valid, 137 SdHoareTripleChecker+Invalid, 163 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 92 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 61 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-28 06:01:50,053 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [105 Valid, 137 Invalid, 163 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 92 Invalid, 0 Unknown, 61 Unchecked, 0.2s Time] [2021-12-28 06:01:50,053 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2021-12-28 06:01:50,055 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 94. [2021-12-28 06:01:50,056 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 94 states, 59 states have (on average 1.6440677966101696) internal successors, (97), 89 states have internal predecessors, (97), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-12-28 06:01:50,056 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 103 transitions. [2021-12-28 06:01:50,056 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 103 transitions. Word has length 34 [2021-12-28 06:01:50,057 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-28 06:01:50,057 INFO L470 AbstractCegarLoop]: Abstraction has 94 states and 103 transitions. [2021-12-28 06:01:50,057 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 5.75) internal successors, (23), 5 states have internal predecessors, (23), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-12-28 06:01:50,057 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 103 transitions. [2021-12-28 06:01:50,058 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-12-28 06:01:50,058 INFO L506 BasicCegarLoop]: Found error trace [2021-12-28 06:01:50,058 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-28 06:01:50,067 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (15)] Forceful destruction successful, exit code 0 [2021-12-28 06:01:50,263 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-28 06:01:50,263 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 40 more)] === [2021-12-28 06:01:50,264 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-28 06:01:50,264 INFO L85 PathProgramCache]: Analyzing trace with hash 2100539895, now seen corresponding path program 1 times [2021-12-28 06:01:50,264 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-28 06:01:50,264 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1822897121] [2021-12-28 06:01:50,264 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-28 06:01:50,264 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-28 06:01:50,264 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-28 06:01:50,265 INFO L229 MonitoredProcess]: Starting monitored process 16 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-28 06:01:50,266 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (16)] Waiting until timeout for monitored process [2021-12-28 06:01:50,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-28 06:01:50,460 INFO L263 TraceCheckSpWp]: Trace formula consists of 233 conjuncts, 20 conjunts are in the unsatisfiable core [2021-12-28 06:01:50,462 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-28 06:01:50,472 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-28 06:01:50,478 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-28 06:01:52,647 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-28 06:01:52,649 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-28 06:01:52,658 INFO L353 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-28 06:01:52,658 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 12 treesize of output 12 [2021-12-28 06:01:54,750 INFO L353 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-28 06:01:54,750 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 12 treesize of output 18 [2021-12-28 06:01:55,043 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-28 06:01:55,043 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-28 06:01:55,458 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-28 06:01:55,458 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1822897121] [2021-12-28 06:01:55,458 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1822897121] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-28 06:01:55,458 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1869200948] [2021-12-28 06:01:55,458 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-28 06:01:55,458 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-28 06:01:55,458 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2021-12-28 06:01:55,459 INFO L229 MonitoredProcess]: Starting monitored process 17 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-12-28 06:01:55,483 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (17)] Waiting until timeout for monitored process [2021-12-28 06:01:55,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-28 06:01:55,747 INFO L263 TraceCheckSpWp]: Trace formula consists of 233 conjuncts, 17 conjunts are in the unsatisfiable core [2021-12-28 06:01:55,748 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-28 06:01:55,762 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-28 06:01:55,800 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2021-12-28 06:01:55,984 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-28 06:01:55,985 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-28 06:01:56,074 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2021-12-28 06:01:58,306 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-28 06:01:58,308 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-28 06:01:58,579 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-12-28 06:01:58,579 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-28 06:01:58,822 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1869200948] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-28 06:01:58,822 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-28 06:01:58,822 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 16 [2021-12-28 06:01:58,824 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1954798407] [2021-12-28 06:01:58,824 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-28 06:01:58,824 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-12-28 06:01:58,825 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-28 06:01:58,825 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-12-28 06:01:58,825 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=350, Unknown=3, NotChecked=0, Total=420 [2021-12-28 06:01:58,826 INFO L87 Difference]: Start difference. First operand 94 states and 103 transitions. Second operand has 17 states, 14 states have (on average 3.7857142857142856) internal successors, (53), 13 states have internal predecessors, (53), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-12-28 06:02:01,245 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-28 06:02:01,245 INFO L93 Difference]: Finished difference Result 134 states and 151 transitions. [2021-12-28 06:02:01,246 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-12-28 06:02:01,246 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 14 states have (on average 3.7857142857142856) internal successors, (53), 13 states have internal predecessors, (53), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 34 [2021-12-28 06:02:01,246 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-28 06:02:01,247 INFO L225 Difference]: With dead ends: 134 [2021-12-28 06:02:01,248 INFO L226 Difference]: Without dead ends: 134 [2021-12-28 06:02:01,248 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 73 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 8.9s TimeCoverageRelationStatistics Valid=105, Invalid=593, Unknown=4, NotChecked=0, Total=702 [2021-12-28 06:02:01,248 INFO L933 BasicCegarLoop]: 73 mSDtfsCounter, 19 mSDsluCounter, 488 mSDsCounter, 0 mSdLazyCounter, 103 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 561 SdHoareTripleChecker+Invalid, 307 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 103 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 201 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-28 06:02:01,249 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 561 Invalid, 307 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 103 Invalid, 0 Unknown, 201 Unchecked, 0.2s Time] [2021-12-28 06:02:01,249 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2021-12-28 06:02:01,252 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 123. [2021-12-28 06:02:01,253 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 123 states, 85 states have (on average 1.5294117647058822) internal successors, (130), 115 states have internal predecessors, (130), 4 states have call successors, (4), 3 states have call predecessors, (4), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-12-28 06:02:01,253 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 138 transitions. [2021-12-28 06:02:01,254 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 138 transitions. Word has length 34 [2021-12-28 06:02:01,254 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-28 06:02:01,254 INFO L470 AbstractCegarLoop]: Abstraction has 123 states and 138 transitions. [2021-12-28 06:02:01,254 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 14 states have (on average 3.7857142857142856) internal successors, (53), 13 states have internal predecessors, (53), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-12-28 06:02:01,254 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 138 transitions. [2021-12-28 06:02:01,255 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-12-28 06:02:01,255 INFO L506 BasicCegarLoop]: Found error trace [2021-12-28 06:02:01,255 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-28 06:02:01,263 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (17)] Forceful destruction successful, exit code 0 [2021-12-28 06:02:01,468 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (16)] Forceful destruction successful, exit code 0 [2021-12-28 06:02:01,660 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt,16 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-28 06:02:01,660 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr35REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 40 more)] === [2021-12-28 06:02:01,661 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-28 06:02:01,661 INFO L85 PathProgramCache]: Analyzing trace with hash 2100539891, now seen corresponding path program 1 times [2021-12-28 06:02:01,661 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-28 06:02:01,661 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1090854523] [2021-12-28 06:02:01,661 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-28 06:02:01,661 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-28 06:02:01,661 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-28 06:02:01,662 INFO L229 MonitoredProcess]: Starting monitored process 18 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-28 06:02:01,664 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (18)] Waiting until timeout for monitored process [2021-12-28 06:02:01,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-28 06:02:01,807 INFO L263 TraceCheckSpWp]: Trace formula consists of 229 conjuncts, 3 conjunts are in the unsatisfiable core [2021-12-28 06:02:01,808 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-28 06:02:01,872 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-12-28 06:02:01,873 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-28 06:02:01,873 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-28 06:02:01,873 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1090854523] [2021-12-28 06:02:01,873 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1090854523] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-28 06:02:01,873 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-28 06:02:01,873 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-12-28 06:02:01,873 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [831846782] [2021-12-28 06:02:01,873 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-28 06:02:01,874 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-12-28 06:02:01,874 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-28 06:02:01,874 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-12-28 06:02:01,874 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-12-28 06:02:01,874 INFO L87 Difference]: Start difference. First operand 123 states and 138 transitions. Second operand has 4 states, 4 states have (on average 5.75) internal successors, (23), 4 states have internal predecessors, (23), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-12-28 06:02:01,893 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-28 06:02:01,894 INFO L93 Difference]: Finished difference Result 166 states and 178 transitions. [2021-12-28 06:02:01,894 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-12-28 06:02:01,894 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 5.75) internal successors, (23), 4 states have internal predecessors, (23), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 34 [2021-12-28 06:02:01,895 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-28 06:02:01,895 INFO L225 Difference]: With dead ends: 166 [2021-12-28 06:02:01,896 INFO L226 Difference]: Without dead ends: 166 [2021-12-28 06:02:01,896 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-12-28 06:02:01,896 INFO L933 BasicCegarLoop]: 84 mSDtfsCounter, 108 mSDsluCounter, 89 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 108 SdHoareTripleChecker+Valid, 173 SdHoareTripleChecker+Invalid, 10 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 9 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-28 06:02:01,897 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [108 Valid, 173 Invalid, 10 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 9 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-28 06:02:01,897 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2021-12-28 06:02:01,900 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 122. [2021-12-28 06:02:01,900 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 122 states, 84 states have (on average 1.5) internal successors, (126), 114 states have internal predecessors, (126), 4 states have call successors, (4), 3 states have call predecessors, (4), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-12-28 06:02:01,901 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 134 transitions. [2021-12-28 06:02:01,901 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 134 transitions. Word has length 34 [2021-12-28 06:02:01,901 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-28 06:02:01,901 INFO L470 AbstractCegarLoop]: Abstraction has 122 states and 134 transitions. [2021-12-28 06:02:01,902 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 5.75) internal successors, (23), 4 states have internal predecessors, (23), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-12-28 06:02:01,902 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 134 transitions. [2021-12-28 06:02:01,902 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-12-28 06:02:01,902 INFO L506 BasicCegarLoop]: Found error trace [2021-12-28 06:02:01,902 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-28 06:02:01,914 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (18)] Forceful destruction successful, exit code 0 [2021-12-28 06:02:02,111 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-28 06:02:02,111 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr10REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 40 more)] === [2021-12-28 06:02:02,112 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-28 06:02:02,112 INFO L85 PathProgramCache]: Analyzing trace with hash 692227296, now seen corresponding path program 1 times [2021-12-28 06:02:02,112 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-28 06:02:02,112 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1917542806] [2021-12-28 06:02:02,112 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-28 06:02:02,112 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-28 06:02:02,112 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-28 06:02:02,113 INFO L229 MonitoredProcess]: Starting monitored process 19 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-28 06:02:02,114 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (19)] Waiting until timeout for monitored process [2021-12-28 06:02:02,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-28 06:02:02,251 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 14 conjunts are in the unsatisfiable core [2021-12-28 06:02:02,252 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-28 06:02:02,274 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-28 06:02:02,364 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 9 [2021-12-28 06:02:02,376 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-28 06:02:02,376 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-28 06:02:02,376 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-28 06:02:02,376 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1917542806] [2021-12-28 06:02:02,376 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1917542806] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-28 06:02:02,376 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-28 06:02:02,376 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2021-12-28 06:02:02,377 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1258999089] [2021-12-28 06:02:02,377 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-28 06:02:02,377 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-12-28 06:02:02,377 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-28 06:02:02,378 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-12-28 06:02:02,378 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2021-12-28 06:02:02,378 INFO L87 Difference]: Start difference. First operand 122 states and 134 transitions. Second operand has 11 states, 10 states have (on average 3.1) internal successors, (31), 10 states have internal predecessors, (31), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-12-28 06:02:03,150 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-28 06:02:03,150 INFO L93 Difference]: Finished difference Result 149 states and 161 transitions. [2021-12-28 06:02:03,151 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-12-28 06:02:03,151 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 3.1) internal successors, (31), 10 states have internal predecessors, (31), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 35 [2021-12-28 06:02:03,151 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-28 06:02:03,155 INFO L225 Difference]: With dead ends: 149 [2021-12-28 06:02:03,156 INFO L226 Difference]: Without dead ends: 149 [2021-12-28 06:02:03,156 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2021-12-28 06:02:03,157 INFO L933 BasicCegarLoop]: 60 mSDtfsCounter, 151 mSDsluCounter, 337 mSDsCounter, 0 mSdLazyCounter, 457 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 151 SdHoareTripleChecker+Valid, 397 SdHoareTripleChecker+Invalid, 460 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 457 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-12-28 06:02:03,157 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [151 Valid, 397 Invalid, 460 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 457 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-12-28 06:02:03,157 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2021-12-28 06:02:03,160 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 123. [2021-12-28 06:02:03,160 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 123 states, 85 states have (on average 1.5058823529411764) internal successors, (128), 115 states have internal predecessors, (128), 4 states have call successors, (4), 3 states have call predecessors, (4), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-12-28 06:02:03,161 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 136 transitions. [2021-12-28 06:02:03,161 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 136 transitions. Word has length 35 [2021-12-28 06:02:03,161 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-28 06:02:03,161 INFO L470 AbstractCegarLoop]: Abstraction has 123 states and 136 transitions. [2021-12-28 06:02:03,162 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 3.1) internal successors, (31), 10 states have internal predecessors, (31), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-12-28 06:02:03,162 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 136 transitions. [2021-12-28 06:02:03,162 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-12-28 06:02:03,163 INFO L506 BasicCegarLoop]: Found error trace [2021-12-28 06:02:03,163 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-28 06:02:03,174 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (19)] Forceful destruction successful, exit code 0 [2021-12-28 06:02:03,371 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-28 06:02:03,371 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 40 more)] === [2021-12-28 06:02:03,372 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-28 06:02:03,372 INFO L85 PathProgramCache]: Analyzing trace with hash 692227297, now seen corresponding path program 1 times [2021-12-28 06:02:03,372 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-28 06:02:03,372 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [906530327] [2021-12-28 06:02:03,372 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-28 06:02:03,372 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-28 06:02:03,372 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-28 06:02:03,373 INFO L229 MonitoredProcess]: Starting monitored process 20 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-28 06:02:03,375 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (20)] Waiting until timeout for monitored process [2021-12-28 06:02:03,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-28 06:02:03,513 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 22 conjunts are in the unsatisfiable core [2021-12-28 06:02:03,515 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-28 06:02:03,538 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-28 06:02:03,724 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-12-28 06:02:03,727 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 9 [2021-12-28 06:02:03,747 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-28 06:02:03,747 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-28 06:02:03,747 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-28 06:02:03,748 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [906530327] [2021-12-28 06:02:03,748 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [906530327] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-28 06:02:03,748 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-28 06:02:03,748 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2021-12-28 06:02:03,748 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1429326142] [2021-12-28 06:02:03,748 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-28 06:02:03,748 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-12-28 06:02:03,748 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-28 06:02:03,749 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-12-28 06:02:03,749 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2021-12-28 06:02:03,749 INFO L87 Difference]: Start difference. First operand 123 states and 136 transitions. Second operand has 11 states, 10 states have (on average 3.1) internal successors, (31), 10 states have internal predecessors, (31), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-12-28 06:02:04,671 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-28 06:02:04,671 INFO L93 Difference]: Finished difference Result 155 states and 167 transitions. [2021-12-28 06:02:04,672 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-12-28 06:02:04,673 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 3.1) internal successors, (31), 10 states have internal predecessors, (31), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 35 [2021-12-28 06:02:04,673 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-28 06:02:04,673 INFO L225 Difference]: With dead ends: 155 [2021-12-28 06:02:04,673 INFO L226 Difference]: Without dead ends: 155 [2021-12-28 06:02:04,674 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2021-12-28 06:02:04,674 INFO L933 BasicCegarLoop]: 49 mSDtfsCounter, 355 mSDsluCounter, 267 mSDsCounter, 0 mSdLazyCounter, 372 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 355 SdHoareTripleChecker+Valid, 316 SdHoareTripleChecker+Invalid, 378 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 372 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-12-28 06:02:04,674 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [355 Valid, 316 Invalid, 378 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 372 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-12-28 06:02:04,675 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2021-12-28 06:02:04,677 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 123. [2021-12-28 06:02:04,678 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 123 states, 85 states have (on average 1.4941176470588236) internal successors, (127), 115 states have internal predecessors, (127), 4 states have call successors, (4), 3 states have call predecessors, (4), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-12-28 06:02:04,678 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 135 transitions. [2021-12-28 06:02:04,678 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 135 transitions. Word has length 35 [2021-12-28 06:02:04,679 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-28 06:02:04,679 INFO L470 AbstractCegarLoop]: Abstraction has 123 states and 135 transitions. [2021-12-28 06:02:04,679 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 3.1) internal successors, (31), 10 states have internal predecessors, (31), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-12-28 06:02:04,679 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 135 transitions. [2021-12-28 06:02:04,680 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-12-28 06:02:04,680 INFO L506 BasicCegarLoop]: Found error trace [2021-12-28 06:02:04,680 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-28 06:02:04,689 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (20)] Ended with exit code 0 [2021-12-28 06:02:04,887 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-28 06:02:04,887 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 40 more)] === [2021-12-28 06:02:04,888 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-28 06:02:04,888 INFO L85 PathProgramCache]: Analyzing trace with hash -489498622, now seen corresponding path program 1 times [2021-12-28 06:02:04,888 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-28 06:02:04,888 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2021082983] [2021-12-28 06:02:04,888 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-28 06:02:04,888 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-28 06:02:04,888 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-28 06:02:04,889 INFO L229 MonitoredProcess]: Starting monitored process 21 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-28 06:02:04,890 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (21)] Waiting until timeout for monitored process [2021-12-28 06:02:05,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-28 06:02:05,039 INFO L263 TraceCheckSpWp]: Trace formula consists of 247 conjuncts, 5 conjunts are in the unsatisfiable core [2021-12-28 06:02:05,040 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-28 06:02:05,123 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-12-28 06:02:05,123 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-28 06:02:05,123 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-28 06:02:05,123 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2021082983] [2021-12-28 06:02:05,124 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2021082983] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-28 06:02:05,124 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-28 06:02:05,124 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-12-28 06:02:05,124 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1124689611] [2021-12-28 06:02:05,124 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-28 06:02:05,125 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-12-28 06:02:05,125 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-28 06:02:05,125 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-12-28 06:02:05,125 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-12-28 06:02:05,126 INFO L87 Difference]: Start difference. First operand 123 states and 135 transitions. Second operand has 5 states, 4 states have (on average 6.5) internal successors, (26), 5 states have internal predecessors, (26), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-12-28 06:02:05,270 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-28 06:02:05,270 INFO L93 Difference]: Finished difference Result 118 states and 130 transitions. [2021-12-28 06:02:05,271 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-28 06:02:05,271 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 6.5) internal successors, (26), 5 states have internal predecessors, (26), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 37 [2021-12-28 06:02:05,271 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-28 06:02:05,272 INFO L225 Difference]: With dead ends: 118 [2021-12-28 06:02:05,272 INFO L226 Difference]: Without dead ends: 118 [2021-12-28 06:02:05,272 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-12-28 06:02:05,273 INFO L933 BasicCegarLoop]: 60 mSDtfsCounter, 104 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 104 SdHoareTripleChecker+Valid, 117 SdHoareTripleChecker+Invalid, 45 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-28 06:02:05,273 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [104 Valid, 117 Invalid, 45 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-28 06:02:05,274 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2021-12-28 06:02:05,276 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 118. [2021-12-28 06:02:05,276 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 118 states, 85 states have (on average 1.4352941176470588) internal successors, (122), 110 states have internal predecessors, (122), 4 states have call successors, (4), 3 states have call predecessors, (4), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-12-28 06:02:05,277 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 130 transitions. [2021-12-28 06:02:05,277 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 130 transitions. Word has length 37 [2021-12-28 06:02:05,277 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-28 06:02:05,277 INFO L470 AbstractCegarLoop]: Abstraction has 118 states and 130 transitions. [2021-12-28 06:02:05,277 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 6.5) internal successors, (26), 5 states have internal predecessors, (26), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-12-28 06:02:05,277 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 130 transitions. [2021-12-28 06:02:05,278 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-12-28 06:02:05,278 INFO L506 BasicCegarLoop]: Found error trace [2021-12-28 06:02:05,278 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-28 06:02:05,290 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (21)] Forceful destruction successful, exit code 0 [2021-12-28 06:02:05,487 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-28 06:02:05,487 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr21REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 40 more)] === [2021-12-28 06:02:05,488 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-28 06:02:05,488 INFO L85 PathProgramCache]: Analyzing trace with hash 2038227298, now seen corresponding path program 1 times [2021-12-28 06:02:05,488 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-28 06:02:05,488 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1043331279] [2021-12-28 06:02:05,489 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-28 06:02:05,489 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-28 06:02:05,489 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-28 06:02:05,490 INFO L229 MonitoredProcess]: Starting monitored process 22 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-28 06:02:05,492 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (22)] Waiting until timeout for monitored process [2021-12-28 06:02:05,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-28 06:02:05,658 INFO L263 TraceCheckSpWp]: Trace formula consists of 254 conjuncts, 27 conjunts are in the unsatisfiable core [2021-12-28 06:02:05,660 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-28 06:02:05,806 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-12-28 06:02:05,903 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-12-28 06:02:05,956 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-28 06:02:05,957 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-12-28 06:02:06,001 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-12-28 06:02:06,001 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-28 06:02:06,145 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 23 [2021-12-28 06:02:06,390 INFO L353 Elim1Store]: treesize reduction 13, result has 62.9 percent of original size [2021-12-28 06:02:06,390 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 164 treesize of output 161 [2021-12-28 06:02:06,524 INFO L353 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2021-12-28 06:02:06,525 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 16 treesize of output 15 [2021-12-28 06:02:06,608 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-12-28 06:02:06,609 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-28 06:02:06,609 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1043331279] [2021-12-28 06:02:06,609 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1043331279] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-28 06:02:06,609 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-28 06:02:06,609 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 10] total 22 [2021-12-28 06:02:06,609 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1016552420] [2021-12-28 06:02:06,609 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-28 06:02:06,610 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-12-28 06:02:06,610 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-28 06:02:06,610 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-12-28 06:02:06,610 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=454, Unknown=0, NotChecked=0, Total=506 [2021-12-28 06:02:06,610 INFO L87 Difference]: Start difference. First operand 118 states and 130 transitions. Second operand has 23 states, 22 states have (on average 2.227272727272727) internal successors, (49), 21 states have internal predecessors, (49), 2 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-12-28 06:02:08,222 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-28 06:02:08,222 INFO L93 Difference]: Finished difference Result 135 states and 148 transitions. [2021-12-28 06:02:08,223 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-12-28 06:02:08,223 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 22 states have (on average 2.227272727272727) internal successors, (49), 21 states have internal predecessors, (49), 2 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) Word has length 39 [2021-12-28 06:02:08,224 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-28 06:02:08,226 INFO L225 Difference]: With dead ends: 135 [2021-12-28 06:02:08,226 INFO L226 Difference]: Without dead ends: 135 [2021-12-28 06:02:08,226 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 54 SyntacticMatches, 1 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 134 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=192, Invalid=1068, Unknown=0, NotChecked=0, Total=1260 [2021-12-28 06:02:08,227 INFO L933 BasicCegarLoop]: 54 mSDtfsCounter, 65 mSDsluCounter, 587 mSDsCounter, 0 mSdLazyCounter, 546 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 641 SdHoareTripleChecker+Invalid, 731 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 546 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 181 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-12-28 06:02:08,227 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [65 Valid, 641 Invalid, 731 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 546 Invalid, 0 Unknown, 181 Unchecked, 0.8s Time] [2021-12-28 06:02:08,228 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2021-12-28 06:02:08,232 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 121. [2021-12-28 06:02:08,232 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 121 states, 89 states have (on average 1.4269662921348314) internal successors, (127), 113 states have internal predecessors, (127), 4 states have call successors, (4), 3 states have call predecessors, (4), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-12-28 06:02:08,233 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 135 transitions. [2021-12-28 06:02:08,233 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 135 transitions. Word has length 39 [2021-12-28 06:02:08,233 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-28 06:02:08,234 INFO L470 AbstractCegarLoop]: Abstraction has 121 states and 135 transitions. [2021-12-28 06:02:08,234 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 22 states have (on average 2.227272727272727) internal successors, (49), 21 states have internal predecessors, (49), 2 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-12-28 06:02:08,234 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 135 transitions. [2021-12-28 06:02:08,237 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-12-28 06:02:08,237 INFO L506 BasicCegarLoop]: Found error trace [2021-12-28 06:02:08,237 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-28 06:02:08,251 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (22)] Forceful destruction successful, exit code 0 [2021-12-28 06:02:08,447 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-28 06:02:08,448 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr22REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 40 more)] === [2021-12-28 06:02:08,448 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-28 06:02:08,448 INFO L85 PathProgramCache]: Analyzing trace with hash 2038227299, now seen corresponding path program 1 times [2021-12-28 06:02:08,448 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-28 06:02:08,448 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [634339240] [2021-12-28 06:02:08,448 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-28 06:02:08,449 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-28 06:02:08,449 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-28 06:02:08,449 INFO L229 MonitoredProcess]: Starting monitored process 23 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-28 06:02:08,450 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (23)] Waiting until timeout for monitored process [2021-12-28 06:02:08,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-28 06:02:08,649 INFO L263 TraceCheckSpWp]: Trace formula consists of 254 conjuncts, 33 conjunts are in the unsatisfiable core [2021-12-28 06:02:08,651 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-28 06:02:08,861 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-12-28 06:02:08,871 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-12-28 06:02:09,086 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-28 06:02:09,113 INFO L353 Elim1Store]: treesize reduction 12, result has 64.7 percent of original size [2021-12-28 06:02:09,114 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 59 treesize of output 53 [2021-12-28 06:02:09,130 INFO L353 Elim1Store]: treesize reduction 30, result has 9.1 percent of original size [2021-12-28 06:02:09,130 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 46 treesize of output 32 [2021-12-28 06:02:09,234 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-12-28 06:02:09,234 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-28 06:02:10,437 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-28 06:02:10,519 INFO L353 Elim1Store]: treesize reduction 27, result has 57.1 percent of original size [2021-12-28 06:02:10,519 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 450 treesize of output 417 [2021-12-28 06:02:11,074 INFO L353 Elim1Store]: treesize reduction 37, result has 66.7 percent of original size [2021-12-28 06:02:11,075 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 6 new quantified variables, introduced 10 case distinctions, treesize of input 1088 treesize of output 983 [2021-12-28 06:02:12,904 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-28 06:02:12,905 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 24 treesize of output 28 [2021-12-28 06:02:13,626 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-28 06:02:13,626 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-28 06:02:13,626 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [634339240] [2021-12-28 06:02:13,626 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [634339240] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-28 06:02:13,626 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-28 06:02:13,626 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 13] total 28 [2021-12-28 06:02:13,627 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1626914122] [2021-12-28 06:02:13,627 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-28 06:02:13,627 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-12-28 06:02:13,628 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-28 06:02:13,628 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-12-28 06:02:13,628 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=740, Unknown=0, NotChecked=0, Total=812 [2021-12-28 06:02:13,629 INFO L87 Difference]: Start difference. First operand 121 states and 135 transitions. Second operand has 29 states, 28 states have (on average 2.1785714285714284) internal successors, (61), 26 states have internal predecessors, (61), 3 states have call successors, (3), 1 states have call predecessors, (3), 3 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2021-12-28 06:02:16,061 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-28 06:02:16,061 INFO L93 Difference]: Finished difference Result 153 states and 168 transitions. [2021-12-28 06:02:16,062 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-12-28 06:02:16,062 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 28 states have (on average 2.1785714285714284) internal successors, (61), 26 states have internal predecessors, (61), 3 states have call successors, (3), 1 states have call predecessors, (3), 3 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) Word has length 39 [2021-12-28 06:02:16,063 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-28 06:02:16,063 INFO L225 Difference]: With dead ends: 153 [2021-12-28 06:02:16,063 INFO L226 Difference]: Without dead ends: 153 [2021-12-28 06:02:16,064 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 137 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=162, Invalid=1170, Unknown=0, NotChecked=0, Total=1332 [2021-12-28 06:02:16,064 INFO L933 BasicCegarLoop]: 47 mSDtfsCounter, 78 mSDsluCounter, 681 mSDsCounter, 0 mSdLazyCounter, 683 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 79 SdHoareTripleChecker+Valid, 728 SdHoareTripleChecker+Invalid, 849 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 683 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 160 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2021-12-28 06:02:16,065 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [79 Valid, 728 Invalid, 849 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 683 Invalid, 0 Unknown, 160 Unchecked, 1.8s Time] [2021-12-28 06:02:16,065 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 153 states. [2021-12-28 06:02:16,067 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 153 to 133. [2021-12-28 06:02:16,067 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 101 states have (on average 1.386138613861386) internal successors, (140), 125 states have internal predecessors, (140), 4 states have call successors, (4), 3 states have call predecessors, (4), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-12-28 06:02:16,068 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 148 transitions. [2021-12-28 06:02:16,068 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 148 transitions. Word has length 39 [2021-12-28 06:02:16,068 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-28 06:02:16,068 INFO L470 AbstractCegarLoop]: Abstraction has 133 states and 148 transitions. [2021-12-28 06:02:16,069 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 28 states have (on average 2.1785714285714284) internal successors, (61), 26 states have internal predecessors, (61), 3 states have call successors, (3), 1 states have call predecessors, (3), 3 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2021-12-28 06:02:16,069 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 148 transitions. [2021-12-28 06:02:16,069 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-12-28 06:02:16,069 INFO L506 BasicCegarLoop]: Found error trace [2021-12-28 06:02:16,069 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-28 06:02:16,082 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (23)] Forceful destruction successful, exit code 0 [2021-12-28 06:02:16,280 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-28 06:02:16,280 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr16ASSERT_VIOLATIONMEMORY_FREE === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 40 more)] === [2021-12-28 06:02:16,280 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-28 06:02:16,280 INFO L85 PathProgramCache]: Analyzing trace with hash -1239477056, now seen corresponding path program 1 times [2021-12-28 06:02:16,281 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-28 06:02:16,281 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [776643297] [2021-12-28 06:02:16,281 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-28 06:02:16,281 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-28 06:02:16,281 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-28 06:02:16,282 INFO L229 MonitoredProcess]: Starting monitored process 24 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-28 06:02:16,287 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (24)] Waiting until timeout for monitored process [2021-12-28 06:02:16,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-28 06:02:16,445 INFO L263 TraceCheckSpWp]: Trace formula consists of 261 conjuncts, 39 conjunts are in the unsatisfiable core [2021-12-28 06:02:16,447 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-28 06:02:16,458 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-28 06:02:16,600 INFO L353 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-28 06:02:16,600 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 14 treesize of output 14 [2021-12-28 06:02:16,702 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-12-28 06:02:16,825 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-12-28 06:02:16,956 INFO L353 Elim1Store]: treesize reduction 3, result has 75.0 percent of original size [2021-12-28 06:02:16,956 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 23 [2021-12-28 06:02:16,988 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-28 06:02:16,988 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-28 06:02:17,231 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 23 [2021-12-28 06:02:17,443 INFO L353 Elim1Store]: treesize reduction 13, result has 62.9 percent of original size [2021-12-28 06:02:17,444 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 183 treesize of output 172 [2021-12-28 06:02:17,983 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-28 06:02:17,983 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-28 06:02:17,983 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [776643297] [2021-12-28 06:02:17,983 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [776643297] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-28 06:02:17,983 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-28 06:02:17,983 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 36 [2021-12-28 06:02:17,983 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [688525628] [2021-12-28 06:02:17,984 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-28 06:02:17,984 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-12-28 06:02:17,984 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-28 06:02:17,984 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-12-28 06:02:17,985 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=1175, Unknown=0, NotChecked=0, Total=1260 [2021-12-28 06:02:17,985 INFO L87 Difference]: Start difference. First operand 133 states and 148 transitions. Second operand has 36 states, 36 states have (on average 1.8333333333333333) internal successors, (66), 30 states have internal predecessors, (66), 2 states have call successors, (3), 3 states have call predecessors, (3), 4 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4)