./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/loop-acceleration/functions_1-2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability 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/AutomizerReach.xml -i ../sv-benchmarks/c/loop-acceleration/functions_1-2.c -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 3c699f32b26271d9b8672d2685c3f1aa3d3ad54df32baf7d1d77d9a96ddd2517 --- Real Ultimate output --- This is Ultimate 0.2.2-dev-ae00767 [2021-12-27 23:58:51,065 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-12-27 23:58:51,068 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-12-27 23:58:51,098 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-12-27 23:58:51,098 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-12-27 23:58:51,101 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-12-27 23:58:51,102 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-12-27 23:58:51,109 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-12-27 23:58:51,110 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-12-27 23:58:51,114 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-12-27 23:58:51,114 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-12-27 23:58:51,117 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-12-27 23:58:51,118 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-12-27 23:58:51,119 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-12-27 23:58:51,120 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-12-27 23:58:51,123 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-12-27 23:58:51,123 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-12-27 23:58:51,124 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-12-27 23:58:51,125 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-12-27 23:58:51,128 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-12-27 23:58:51,130 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-12-27 23:58:51,131 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-12-27 23:58:51,132 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-12-27 23:58:51,133 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-12-27 23:58:51,140 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-12-27 23:58:51,140 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-12-27 23:58:51,140 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-12-27 23:58:51,141 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-12-27 23:58:51,141 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-12-27 23:58:51,141 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-12-27 23:58:51,142 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-12-27 23:58:51,142 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-12-27 23:58:51,143 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-12-27 23:58:51,144 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-12-27 23:58:51,144 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-12-27 23:58:51,145 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-12-27 23:58:51,145 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-12-27 23:58:51,145 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-12-27 23:58:51,145 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-12-27 23:58:51,146 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-12-27 23:58:51,147 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-12-27 23:58:51,148 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2021-12-27 23:58:51,166 INFO L113 SettingsManager]: Loading preferences was successful [2021-12-27 23:58:51,166 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-12-27 23:58:51,166 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-12-27 23:58:51,166 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-12-27 23:58:51,167 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-12-27 23:58:51,167 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-12-27 23:58:51,167 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-12-27 23:58:51,168 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-12-27 23:58:51,169 INFO L138 SettingsManager]: * Use SBE=true [2021-12-27 23:58:51,169 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-12-27 23:58:51,169 INFO L138 SettingsManager]: * sizeof long=4 [2021-12-27 23:58:51,170 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-12-27 23:58:51,170 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-12-27 23:58:51,170 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-12-27 23:58:51,170 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-12-27 23:58:51,170 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-12-27 23:58:51,170 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-12-27 23:58:51,170 INFO L138 SettingsManager]: * sizeof long double=12 [2021-12-27 23:58:51,171 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-12-27 23:58:51,171 INFO L138 SettingsManager]: * Use constant arrays=true [2021-12-27 23:58:51,171 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-12-27 23:58:51,171 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-12-27 23:58:51,171 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-12-27 23:58:51,171 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-12-27 23:58:51,172 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-27 23:58:51,177 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-12-27 23:58:51,178 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-12-27 23:58:51,178 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-12-27 23:58:51,178 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-12-27 23:58:51,178 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-12-27 23:58:51,178 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-12-27 23:58:51,178 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-12-27 23:58:51,179 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-12-27 23:58:51,179 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 3c699f32b26271d9b8672d2685c3f1aa3d3ad54df32baf7d1d77d9a96ddd2517 [2021-12-27 23:58:51,412 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-12-27 23:58:51,426 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-12-27 23:58:51,428 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-12-27 23:58:51,428 INFO L271 PluginConnector]: Initializing CDTParser... [2021-12-27 23:58:51,429 INFO L275 PluginConnector]: CDTParser initialized [2021-12-27 23:58:51,430 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/loop-acceleration/functions_1-2.c [2021-12-27 23:58:51,475 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/656c1dfba/3220e51a6f9d4066aa98380b1faaebd1/FLAG7e6abfa8f [2021-12-27 23:58:51,820 INFO L306 CDTParser]: Found 1 translation units. [2021-12-27 23:58:51,821 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/loop-acceleration/functions_1-2.c [2021-12-27 23:58:51,825 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/656c1dfba/3220e51a6f9d4066aa98380b1faaebd1/FLAG7e6abfa8f [2021-12-27 23:58:52,251 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/656c1dfba/3220e51a6f9d4066aa98380b1faaebd1 [2021-12-27 23:58:52,252 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-12-27 23:58:52,253 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-12-27 23:58:52,254 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-12-27 23:58:52,254 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-12-27 23:58:52,257 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-12-27 23:58:52,258 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.12 11:58:52" (1/1) ... [2021-12-27 23:58:52,258 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3992d353 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.12 11:58:52, skipping insertion in model container [2021-12-27 23:58:52,258 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.12 11:58:52" (1/1) ... [2021-12-27 23:58:52,263 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-12-27 23:58:52,271 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-12-27 23:58:52,377 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/loop-acceleration/functions_1-2.c[325,338] [2021-12-27 23:58:52,386 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-27 23:58:52,392 INFO L203 MainTranslator]: Completed pre-run [2021-12-27 23:58:52,400 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/loop-acceleration/functions_1-2.c[325,338] [2021-12-27 23:58:52,406 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-27 23:58:52,415 INFO L208 MainTranslator]: Completed translation [2021-12-27 23:58:52,415 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.12 11:58:52 WrapperNode [2021-12-27 23:58:52,416 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-12-27 23:58:52,416 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-12-27 23:58:52,416 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-12-27 23:58:52,417 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-12-27 23:58:52,421 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.12 11:58:52" (1/1) ... [2021-12-27 23:58:52,426 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.12 11:58:52" (1/1) ... [2021-12-27 23:58:52,479 INFO L137 Inliner]: procedures = 13, calls = 9, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 28 [2021-12-27 23:58:52,480 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-12-27 23:58:52,481 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-12-27 23:58:52,481 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-12-27 23:58:52,481 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-12-27 23:58:52,486 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.12 11:58:52" (1/1) ... [2021-12-27 23:58:52,487 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.12 11:58:52" (1/1) ... [2021-12-27 23:58:52,493 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.12 11:58:52" (1/1) ... [2021-12-27 23:58:52,493 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.12 11:58:52" (1/1) ... [2021-12-27 23:58:52,501 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.12 11:58:52" (1/1) ... [2021-12-27 23:58:52,504 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.12 11:58:52" (1/1) ... [2021-12-27 23:58:52,505 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.12 11:58:52" (1/1) ... [2021-12-27 23:58:52,505 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-12-27 23:58:52,506 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-12-27 23:58:52,506 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-12-27 23:58:52,506 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-12-27 23:58:52,507 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.12 11:58:52" (1/1) ... [2021-12-27 23:58:52,511 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-27 23:58:52,518 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-27 23:58:52,528 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) [2021-12-27 23:58:52,555 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 [2021-12-27 23:58:52,571 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-12-27 23:58:52,571 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-12-27 23:58:52,571 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-12-27 23:58:52,571 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-12-27 23:58:52,623 INFO L234 CfgBuilder]: Building ICFG [2021-12-27 23:58:52,624 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2021-12-27 23:58:52,712 INFO L275 CfgBuilder]: Performing block encoding [2021-12-27 23:58:52,716 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-12-27 23:58:52,716 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-12-27 23:58:52,717 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.12 11:58:52 BoogieIcfgContainer [2021-12-27 23:58:52,717 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-12-27 23:58:52,718 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-12-27 23:58:52,718 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-12-27 23:58:52,720 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-12-27 23:58:52,720 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 27.12 11:58:52" (1/3) ... [2021-12-27 23:58:52,735 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2da71943 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.12 11:58:52, skipping insertion in model container [2021-12-27 23:58:52,736 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.12 11:58:52" (2/3) ... [2021-12-27 23:58:52,736 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2da71943 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.12 11:58:52, skipping insertion in model container [2021-12-27 23:58:52,736 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.12 11:58:52" (3/3) ... [2021-12-27 23:58:52,737 INFO L111 eAbstractionObserver]: Analyzing ICFG functions_1-2.c [2021-12-27 23:58:52,740 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-12-27 23:58:52,741 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-12-27 23:58:52,769 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-12-27 23:58:52,773 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-12-27 23:58:52,779 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-12-27 23:58:52,799 INFO L276 IsEmpty]: Start isEmpty. Operand has 12 states, 10 states have (on average 1.4) internal successors, (14), 11 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-27 23:58:52,802 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-12-27 23:58:52,812 INFO L506 BasicCegarLoop]: Found error trace [2021-12-27 23:58:52,813 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-12-27 23:58:52,813 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-27 23:58:52,817 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-27 23:58:52,817 INFO L85 PathProgramCache]: Analyzing trace with hash 889635821, now seen corresponding path program 1 times [2021-12-27 23:58:52,838 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-27 23:58:52,838 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1848393215] [2021-12-27 23:58:52,839 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-27 23:58:52,839 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-27 23:58:52,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 23:58:53,029 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-27 23:58:53,030 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-27 23:58:53,031 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1848393215] [2021-12-27 23:58:53,032 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1848393215] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-27 23:58:53,032 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-27 23:58:53,032 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-12-27 23:58:53,034 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2096610194] [2021-12-27 23:58:53,034 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-27 23:58:53,037 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-27 23:58:53,038 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-27 23:58:53,061 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-27 23:58:53,062 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-27 23:58:53,064 INFO L87 Difference]: Start difference. First operand has 12 states, 10 states have (on average 1.4) internal successors, (14), 11 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-27 23:58:53,084 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-27 23:58:53,084 INFO L93 Difference]: Finished difference Result 22 states and 26 transitions. [2021-12-27 23:58:53,085 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-27 23:58:53,086 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2021-12-27 23:58:53,086 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-27 23:58:53,091 INFO L225 Difference]: With dead ends: 22 [2021-12-27 23:58:53,092 INFO L226 Difference]: Without dead ends: 10 [2021-12-27 23:58:53,097 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-27 23:58:53,102 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 1 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 5 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 18 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 [2021-12-27 23:58:53,103 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 18 Invalid, 5 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 5 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-27 23:58:53,114 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10 states. [2021-12-27 23:58:53,124 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10 to 9. [2021-12-27 23:58:53,125 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9 states, 8 states have (on average 1.125) internal successors, (9), 8 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-27 23:58:53,125 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 9 transitions. [2021-12-27 23:58:53,126 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 9 transitions. Word has length 6 [2021-12-27 23:58:53,126 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-27 23:58:53,126 INFO L470 AbstractCegarLoop]: Abstraction has 9 states and 9 transitions. [2021-12-27 23:58:53,127 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-27 23:58:53,127 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 9 transitions. [2021-12-27 23:58:53,127 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-12-27 23:58:53,127 INFO L506 BasicCegarLoop]: Found error trace [2021-12-27 23:58:53,128 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-12-27 23:58:53,128 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-12-27 23:58:53,129 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-27 23:58:53,130 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-27 23:58:53,131 INFO L85 PathProgramCache]: Analyzing trace with hash 294764431, now seen corresponding path program 1 times [2021-12-27 23:58:53,131 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-27 23:58:53,131 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [123410690] [2021-12-27 23:58:53,131 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-27 23:58:53,131 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-27 23:58:53,162 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 23:58:53,236 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-27 23:58:53,236 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-27 23:58:53,237 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [123410690] [2021-12-27 23:58:53,237 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [123410690] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-27 23:58:53,237 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [72844999] [2021-12-27 23:58:53,237 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-27 23:58:53,238 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-27 23:58:53,238 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-27 23:58:53,239 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) [2021-12-27 23:58:53,240 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-12-27 23:58:53,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 23:58:53,275 INFO L263 TraceCheckSpWp]: Trace formula consists of 44 conjuncts, 11 conjunts are in the unsatisfiable core [2021-12-27 23:58:53,278 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-27 23:58:53,361 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-27 23:58:53,361 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-27 23:58:53,403 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-27 23:58:53,403 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [72844999] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-27 23:58:53,404 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-27 23:58:53,404 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 9 [2021-12-27 23:58:53,404 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2019705386] [2021-12-27 23:58:53,405 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-27 23:58:53,405 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-12-27 23:58:53,405 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-27 23:58:53,406 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-12-27 23:58:53,406 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-12-27 23:58:53,406 INFO L87 Difference]: Start difference. First operand 9 states and 9 transitions. Second operand has 9 states, 9 states have (on average 1.5555555555555556) internal successors, (14), 9 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-27 23:58:53,469 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-27 23:58:53,470 INFO L93 Difference]: Finished difference Result 17 states and 18 transitions. [2021-12-27 23:58:53,470 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-12-27 23:58:53,470 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.5555555555555556) internal successors, (14), 9 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2021-12-27 23:58:53,470 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-27 23:58:53,471 INFO L225 Difference]: With dead ends: 17 [2021-12-27 23:58:53,471 INFO L226 Difference]: Without dead ends: 13 [2021-12-27 23:58:53,471 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 12 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=55, Invalid=101, Unknown=0, NotChecked=0, Total=156 [2021-12-27 23:58:53,472 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 1 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 27 SdHoareTripleChecker+Invalid, 38 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-27 23:58:53,473 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 27 Invalid, 38 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 30 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-27 23:58:53,473 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2021-12-27 23:58:53,475 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2021-12-27 23:58:53,476 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 12 states have (on average 1.0833333333333333) internal successors, (13), 12 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-27 23:58:53,476 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2021-12-27 23:58:53,476 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 8 [2021-12-27 23:58:53,476 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-27 23:58:53,476 INFO L470 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2021-12-27 23:58:53,477 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 1.5555555555555556) internal successors, (14), 9 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-27 23:58:53,477 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2021-12-27 23:58:53,477 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-12-27 23:58:53,477 INFO L506 BasicCegarLoop]: Found error trace [2021-12-27 23:58:53,477 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1] [2021-12-27 23:58:53,496 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-12-27 23:58:53,691 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-27 23:58:53,693 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-27 23:58:53,694 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-27 23:58:53,694 INFO L85 PathProgramCache]: Analyzing trace with hash 1489810771, now seen corresponding path program 2 times [2021-12-27 23:58:53,694 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-27 23:58:53,695 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [288801487] [2021-12-27 23:58:53,695 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-27 23:58:53,696 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-27 23:58:53,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 23:58:53,823 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-27 23:58:53,824 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-27 23:58:53,824 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [288801487] [2021-12-27 23:58:53,824 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [288801487] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-27 23:58:53,827 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [188975195] [2021-12-27 23:58:53,827 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-27 23:58:53,827 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-27 23:58:53,828 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-27 23:58:53,829 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) [2021-12-27 23:58:53,830 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-12-27 23:58:53,860 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-27 23:58:53,860 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-27 23:58:53,861 INFO L263 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 27 conjunts are in the unsatisfiable core [2021-12-27 23:58:53,862 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-27 23:58:53,953 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-27 23:58:53,953 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-27 23:58:54,070 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-27 23:58:54,071 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [188975195] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-27 23:58:54,071 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-27 23:58:54,071 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 17 [2021-12-27 23:58:54,071 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1295063047] [2021-12-27 23:58:54,072 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-27 23:58:54,072 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-12-27 23:58:54,073 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-27 23:58:54,073 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-12-27 23:58:54,074 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=208, Unknown=0, NotChecked=0, Total=272 [2021-12-27 23:58:54,074 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand has 17 states, 17 states have (on average 1.2941176470588236) internal successors, (22), 17 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-27 23:58:54,501 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-27 23:58:54,502 INFO L93 Difference]: Finished difference Result 25 states and 28 transitions. [2021-12-27 23:58:54,502 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-12-27 23:58:54,502 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.2941176470588236) internal successors, (22), 17 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2021-12-27 23:58:54,502 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-27 23:58:54,503 INFO L225 Difference]: With dead ends: 25 [2021-12-27 23:58:54,503 INFO L226 Difference]: Without dead ends: 21 [2021-12-27 23:58:54,503 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 99 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=223, Invalid=589, Unknown=0, NotChecked=0, Total=812 [2021-12-27 23:58:54,504 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 4 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 71 mSolverCounterSat, 36 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 107 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 36 IncrementalHoareTripleChecker+Valid, 71 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-27 23:58:54,504 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4 Valid, 36 Invalid, 107 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [36 Valid, 71 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-27 23:58:54,504 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-12-27 23:58:54,507 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2021-12-27 23:58:54,507 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 20 states have (on average 1.05) internal successors, (21), 20 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-27 23:58:54,508 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2021-12-27 23:58:54,508 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 12 [2021-12-27 23:58:54,508 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-27 23:58:54,508 INFO L470 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2021-12-27 23:58:54,508 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 1.2941176470588236) internal successors, (22), 17 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-27 23:58:54,508 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2021-12-27 23:58:54,509 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-12-27 23:58:54,509 INFO L506 BasicCegarLoop]: Found error trace [2021-12-27 23:58:54,509 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1] [2021-12-27 23:58:54,525 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2021-12-27 23:58:54,716 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,SelfDestructingSolverStorable2 [2021-12-27 23:58:54,717 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-27 23:58:54,717 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-27 23:58:54,717 INFO L85 PathProgramCache]: Analyzing trace with hash 1781144283, now seen corresponding path program 3 times [2021-12-27 23:58:54,717 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-27 23:58:54,717 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [805949089] [2021-12-27 23:58:54,717 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-27 23:58:54,717 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-27 23:58:54,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 23:58:54,951 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-27 23:58:54,951 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-27 23:58:54,951 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [805949089] [2021-12-27 23:58:54,951 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [805949089] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-27 23:58:54,951 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1753517215] [2021-12-27 23:58:54,951 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-27 23:58:54,951 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-27 23:58:54,951 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-27 23:58:54,953 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) [2021-12-27 23:58:54,977 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-12-27 23:58:55,013 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-12-27 23:58:55,013 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-27 23:58:55,014 WARN L261 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 59 conjunts are in the unsatisfiable core [2021-12-27 23:58:55,016 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-27 23:58:55,137 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-27 23:58:55,138 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-27 23:58:55,466 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-27 23:58:55,466 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1753517215] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-27 23:58:55,466 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-27 23:58:55,466 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 33 [2021-12-27 23:58:55,466 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [597745943] [2021-12-27 23:58:55,466 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-27 23:58:55,467 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2021-12-27 23:58:55,467 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-27 23:58:55,467 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-12-27 23:58:55,467 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=192, Invalid=864, Unknown=0, NotChecked=0, Total=1056 [2021-12-27 23:58:55,468 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand has 33 states, 33 states have (on average 1.1515151515151516) internal successors, (38), 33 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-27 23:59:02,959 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-27 23:59:02,959 INFO L93 Difference]: Finished difference Result 41 states and 48 transitions. [2021-12-27 23:59:02,959 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-12-27 23:59:02,959 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 1.1515151515151516) internal successors, (38), 33 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-12-27 23:59:02,960 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-27 23:59:02,960 INFO L225 Difference]: With dead ends: 41 [2021-12-27 23:59:02,960 INFO L226 Difference]: Without dead ends: 37 [2021-12-27 23:59:02,961 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 24 SyntacticMatches, 1 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 479 ImplicationChecksByTransitivity, 7.5s TimeCoverageRelationStatistics Valid=895, Invalid=2765, Unknown=0, NotChecked=0, Total=3660 [2021-12-27 23:59:02,962 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 6 mSDsluCounter, 69 mSDsCounter, 0 mSdLazyCounter, 281 mSolverCounterSat, 135 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 75 SdHoareTripleChecker+Invalid, 416 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 135 IncrementalHoareTripleChecker+Valid, 281 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-12-27 23:59:02,962 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 75 Invalid, 416 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [135 Valid, 281 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-12-27 23:59:02,963 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-12-27 23:59:02,967 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2021-12-27 23:59:02,967 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 36 states have (on average 1.0277777777777777) internal successors, (37), 36 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-27 23:59:02,968 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2021-12-27 23:59:02,968 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 20 [2021-12-27 23:59:02,968 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-27 23:59:02,968 INFO L470 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2021-12-27 23:59:02,969 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 1.1515151515151516) internal successors, (38), 33 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-27 23:59:02,969 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2021-12-27 23:59:02,969 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-12-27 23:59:02,969 INFO L506 BasicCegarLoop]: Found error trace [2021-12-27 23:59:02,970 INFO L514 BasicCegarLoop]: trace histogram [15, 15, 1, 1, 1, 1, 1, 1] [2021-12-27 23:59:02,986 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-12-27 23:59:03,170 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-27 23:59:03,171 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-27 23:59:03,171 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-27 23:59:03,172 INFO L85 PathProgramCache]: Analyzing trace with hash 685690347, now seen corresponding path program 4 times [2021-12-27 23:59:03,172 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-27 23:59:03,172 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1103365168] [2021-12-27 23:59:03,172 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-27 23:59:03,172 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-27 23:59:03,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 23:59:03,720 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-27 23:59:03,720 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-27 23:59:03,720 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1103365168] [2021-12-27 23:59:03,720 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1103365168] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-27 23:59:03,721 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [518672614] [2021-12-27 23:59:03,721 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-27 23:59:03,721 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-27 23:59:03,721 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-27 23:59:03,722 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) [2021-12-27 23:59:03,723 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-12-27 23:59:03,761 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-27 23:59:03,762 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-27 23:59:03,763 WARN L261 TraceCheckSpWp]: Trace formula consists of 170 conjuncts, 123 conjunts are in the unsatisfiable core [2021-12-27 23:59:03,766 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-27 23:59:03,942 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-27 23:59:03,942 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-27 23:59:05,217 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-27 23:59:05,218 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [518672614] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-27 23:59:05,218 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-27 23:59:05,218 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 65 [2021-12-27 23:59:05,218 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [586137111] [2021-12-27 23:59:05,218 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-27 23:59:05,218 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 65 states [2021-12-27 23:59:05,219 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-27 23:59:05,219 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2021-12-27 23:59:05,220 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=640, Invalid=3520, Unknown=0, NotChecked=0, Total=4160 [2021-12-27 23:59:05,221 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand has 65 states, 65 states have (on average 1.0769230769230769) internal successors, (70), 65 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-28 00:00:11,907 WARN L228 SmtUtils]: Spent 5.51s on a formula simplification. DAG size of input: 97 DAG size of output: 17 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate)