./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/recursive-simple/sum_20x0-1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 20ed64ec 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/recursive-simple/sum_20x0-1.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 d709c141e865b9e316ae50970f4a7a44b0dfd8eb ...................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE --- Real Ultimate output --- This is Ultimate 0.2.1-dev-20ed64e [2021-08-26 09:01:32,970 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-08-26 09:01:32,973 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-08-26 09:01:33,011 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-08-26 09:01:33,012 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-08-26 09:01:33,014 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-08-26 09:01:33,016 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-08-26 09:01:33,021 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-08-26 09:01:33,026 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-08-26 09:01:33,031 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-08-26 09:01:33,032 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-08-26 09:01:33,033 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-08-26 09:01:33,033 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-08-26 09:01:33,036 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-08-26 09:01:33,037 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-08-26 09:01:33,041 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-08-26 09:01:33,042 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-08-26 09:01:33,043 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-08-26 09:01:33,045 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-08-26 09:01:33,053 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-08-26 09:01:33,054 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-08-26 09:01:33,056 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-08-26 09:01:33,058 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-08-26 09:01:33,058 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-08-26 09:01:33,064 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-08-26 09:01:33,065 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-08-26 09:01:33,065 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-08-26 09:01:33,066 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-08-26 09:01:33,067 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-08-26 09:01:33,067 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-08-26 09:01:33,068 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-08-26 09:01:33,068 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-08-26 09:01:33,070 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-08-26 09:01:33,070 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-08-26 09:01:33,071 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-08-26 09:01:33,071 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-08-26 09:01:33,072 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-08-26 09:01:33,072 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-08-26 09:01:33,072 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-08-26 09:01:33,074 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-08-26 09:01:33,074 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-08-26 09:01:33,075 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2021-08-26 09:01:33,113 INFO L113 SettingsManager]: Loading preferences was successful [2021-08-26 09:01:33,114 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-08-26 09:01:33,115 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-08-26 09:01:33,115 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-08-26 09:01:33,117 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-08-26 09:01:33,117 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-08-26 09:01:33,117 INFO L138 SettingsManager]: * Use SBE=true [2021-08-26 09:01:33,117 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-08-26 09:01:33,117 INFO L138 SettingsManager]: * sizeof long=4 [2021-08-26 09:01:33,118 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-08-26 09:01:33,118 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-08-26 09:01:33,118 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-08-26 09:01:33,119 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-08-26 09:01:33,119 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-08-26 09:01:33,119 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-08-26 09:01:33,119 INFO L138 SettingsManager]: * sizeof long double=12 [2021-08-26 09:01:33,119 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-08-26 09:01:33,119 INFO L138 SettingsManager]: * Use constant arrays=true [2021-08-26 09:01:33,119 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-08-26 09:01:33,120 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-08-26 09:01:33,120 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-08-26 09:01:33,120 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-08-26 09:01:33,120 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-08-26 09:01:33,126 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-08-26 09:01:33,126 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-08-26 09:01:33,126 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-08-26 09:01:33,127 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-08-26 09:01:33,127 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-08-26 09:01:33,127 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-08-26 09:01:33,127 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-08-26 09:01:33,127 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> d709c141e865b9e316ae50970f4a7a44b0dfd8eb [2021-08-26 09:01:33,445 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-08-26 09:01:33,465 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-08-26 09:01:33,467 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-08-26 09:01:33,468 INFO L271 PluginConnector]: Initializing CDTParser... [2021-08-26 09:01:33,470 INFO L275 PluginConnector]: CDTParser initialized [2021-08-26 09:01:33,470 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/recursive-simple/sum_20x0-1.c [2021-08-26 09:01:33,540 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/dcda30be3/914b7e8ed88f48c581c36494ea38dd6b/FLAGd2cd2addb [2021-08-26 09:01:33,962 INFO L306 CDTParser]: Found 1 translation units. [2021-08-26 09:01:33,962 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/recursive-simple/sum_20x0-1.c [2021-08-26 09:01:33,967 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/dcda30be3/914b7e8ed88f48c581c36494ea38dd6b/FLAGd2cd2addb [2021-08-26 09:01:34,368 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/dcda30be3/914b7e8ed88f48c581c36494ea38dd6b [2021-08-26 09:01:34,370 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-08-26 09:01:34,371 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-08-26 09:01:34,372 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-08-26 09:01:34,373 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-08-26 09:01:34,375 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-08-26 09:01:34,376 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.08 09:01:34" (1/1) ... [2021-08-26 09:01:34,377 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2ea98091 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 09:01:34, skipping insertion in model container [2021-08-26 09:01:34,377 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.08 09:01:34" (1/1) ... [2021-08-26 09:01:34,383 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-08-26 09:01:34,391 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-08-26 09:01:34,529 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/recursive-simple/sum_20x0-1.c[481,494] [2021-08-26 09:01:34,531 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-08-26 09:01:34,539 INFO L203 MainTranslator]: Completed pre-run [2021-08-26 09:01:34,550 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/recursive-simple/sum_20x0-1.c[481,494] [2021-08-26 09:01:34,550 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-08-26 09:01:34,561 INFO L208 MainTranslator]: Completed translation [2021-08-26 09:01:34,562 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 09:01:34 WrapperNode [2021-08-26 09:01:34,563 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-08-26 09:01:34,565 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-08-26 09:01:34,565 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-08-26 09:01:34,565 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-08-26 09:01:34,570 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 09:01:34" (1/1) ... [2021-08-26 09:01:34,576 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 09:01:34" (1/1) ... [2021-08-26 09:01:34,589 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-08-26 09:01:34,590 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-08-26 09:01:34,590 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-08-26 09:01:34,590 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-08-26 09:01:34,596 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 09:01:34" (1/1) ... [2021-08-26 09:01:34,596 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 09:01:34" (1/1) ... [2021-08-26 09:01:34,597 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 09:01:34" (1/1) ... [2021-08-26 09:01:34,597 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 09:01:34" (1/1) ... [2021-08-26 09:01:34,601 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 09:01:34" (1/1) ... [2021-08-26 09:01:34,602 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 09:01:34" (1/1) ... [2021-08-26 09:01:34,606 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 09:01:34" (1/1) ... [2021-08-26 09:01:34,607 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-08-26 09:01:34,608 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-08-26 09:01:34,609 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-08-26 09:01:34,609 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-08-26 09:01:34,609 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 09:01:34" (1/1) ... [2021-08-26 09:01:34,615 INFO L170 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-08-26 09:01:34,620 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-26 09:01:34,642 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) [2021-08-26 09:01:34,663 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 [2021-08-26 09:01:34,678 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-08-26 09:01:34,678 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-08-26 09:01:34,679 INFO L130 BoogieDeclarations]: Found specification of procedure sum [2021-08-26 09:01:34,679 INFO L138 BoogieDeclarations]: Found implementation of procedure sum [2021-08-26 09:01:34,679 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-08-26 09:01:34,679 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-08-26 09:01:34,921 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-08-26 09:01:34,921 INFO L299 CfgBuilder]: Removed 4 assume(true) statements. [2021-08-26 09:01:34,922 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.08 09:01:34 BoogieIcfgContainer [2021-08-26 09:01:34,923 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-08-26 09:01:34,924 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-08-26 09:01:34,924 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-08-26 09:01:34,927 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-08-26 09:01:34,927 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 26.08 09:01:34" (1/3) ... [2021-08-26 09:01:34,927 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@44d81a8a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.08 09:01:34, skipping insertion in model container [2021-08-26 09:01:34,927 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 09:01:34" (2/3) ... [2021-08-26 09:01:34,928 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@44d81a8a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.08 09:01:34, skipping insertion in model container [2021-08-26 09:01:34,928 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.08 09:01:34" (3/3) ... [2021-08-26 09:01:34,929 INFO L111 eAbstractionObserver]: Analyzing ICFG sum_20x0-1.c [2021-08-26 09:01:34,945 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-08-26 09:01:34,945 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-08-26 09:01:35,027 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-08-26 09:01:35,032 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, mConcurrency=FINITE_AUTOMATA, 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 [2021-08-26 09:01:35,033 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-08-26 09:01:35,044 INFO L276 IsEmpty]: Start isEmpty. Operand has 16 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 12 states have internal predecessors, (14), 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) [2021-08-26 09:01:35,048 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-08-26 09:01:35,048 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 09:01:35,049 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 09:01:35,049 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 09:01:35,053 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 09:01:35,054 INFO L82 PathProgramCache]: Analyzing trace with hash -358017204, now seen corresponding path program 1 times [2021-08-26 09:01:35,061 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 09:01:35,062 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2041438006] [2021-08-26 09:01:35,062 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 09:01:35,063 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 09:01:35,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:35,229 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:35,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:35,300 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-26 09:01:35,301 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 09:01:35,301 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2041438006] [2021-08-26 09:01:35,302 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2041438006] provided 1 perfect and 0 imperfect interpolant sequences [2021-08-26 09:01:35,303 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-08-26 09:01:35,303 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-08-26 09:01:35,306 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1002692217] [2021-08-26 09:01:35,311 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-08-26 09:01:35,312 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 09:01:35,323 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-08-26 09:01:35,324 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-08-26 09:01:35,326 INFO L87 Difference]: Start difference. First operand has 16 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 12 states have internal predecessors, (14), 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 5 states, 4 states have (on average 2.0) internal successors, (8), 5 states have internal predecessors, (8), 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) [2021-08-26 09:01:35,407 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 09:01:35,407 INFO L93 Difference]: Finished difference Result 25 states and 28 transitions. [2021-08-26 09:01:35,408 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-08-26 09:01:35,410 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.0) internal successors, (8), 5 states have internal predecessors, (8), 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 10 [2021-08-26 09:01:35,410 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 09:01:35,417 INFO L225 Difference]: With dead ends: 25 [2021-08-26 09:01:35,418 INFO L226 Difference]: Without dead ends: 15 [2021-08-26 09:01:35,423 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 44.0ms TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-08-26 09:01:35,434 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2021-08-26 09:01:35,450 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2021-08-26 09:01:35,451 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 10 states have (on average 1.1) internal successors, (11), 11 states have internal predecessors, (11), 2 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-08-26 09:01:35,452 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2021-08-26 09:01:35,453 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 10 [2021-08-26 09:01:35,454 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 09:01:35,454 INFO L470 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2021-08-26 09:01:35,455 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 2.0) internal successors, (8), 5 states have internal predecessors, (8), 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) [2021-08-26 09:01:35,455 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2021-08-26 09:01:35,456 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-08-26 09:01:35,456 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 09:01:35,456 INFO L512 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 09:01:35,461 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-08-26 09:01:35,462 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 09:01:35,462 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 09:01:35,463 INFO L82 PathProgramCache]: Analyzing trace with hash 679465686, now seen corresponding path program 1 times [2021-08-26 09:01:35,463 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 09:01:35,463 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1233001441] [2021-08-26 09:01:35,463 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 09:01:35,464 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 09:01:35,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:35,515 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:35,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:35,573 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:35,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:35,626 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-08-26 09:01:35,626 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 09:01:35,627 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1233001441] [2021-08-26 09:01:35,627 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1233001441] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:01:35,627 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [321338611] [2021-08-26 09:01:35,628 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 09:01:35,628 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 09:01:35,628 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-26 09:01:35,631 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) [2021-08-26 09:01:35,632 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-08-26 09:01:35,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:35,689 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 6 conjunts are in the unsatisfiable core [2021-08-26 09:01:35,693 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-26 09:01:35,823 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-08-26 09:01:35,829 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [321338611] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:01:35,829 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-26 09:01:35,830 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 7 [2021-08-26 09:01:35,831 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [858841198] [2021-08-26 09:01:35,832 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-08-26 09:01:35,832 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 09:01:35,833 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-08-26 09:01:35,834 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-08-26 09:01:35,835 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand has 7 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 7 states have internal predecessors, (14), 3 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-08-26 09:01:35,914 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 09:01:35,915 INFO L93 Difference]: Finished difference Result 22 states and 23 transitions. [2021-08-26 09:01:35,915 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-08-26 09:01:35,916 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 7 states have internal predecessors, (14), 3 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) Word has length 16 [2021-08-26 09:01:35,916 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 09:01:35,917 INFO L225 Difference]: With dead ends: 22 [2021-08-26 09:01:35,917 INFO L226 Difference]: Without dead ends: 18 [2021-08-26 09:01:35,918 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 56.0ms TimeCoverageRelationStatistics Valid=25, Invalid=47, Unknown=0, NotChecked=0, Total=72 [2021-08-26 09:01:35,918 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2021-08-26 09:01:35,925 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2021-08-26 09:01:35,926 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 12 states have (on average 1.0833333333333333) internal successors, (13), 13 states have internal predecessors, (13), 2 states have call successors, (2), 1 states have call predecessors, (2), 3 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2021-08-26 09:01:35,926 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2021-08-26 09:01:35,926 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 16 [2021-08-26 09:01:35,927 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 09:01:35,927 INFO L470 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2021-08-26 09:01:35,927 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 7 states have internal predecessors, (14), 3 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-08-26 09:01:35,927 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2021-08-26 09:01:35,928 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-08-26 09:01:35,928 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 09:01:35,928 INFO L512 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 09:01:35,948 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-08-26 09:01:36,138 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 [2021-08-26 09:01:36,138 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 09:01:36,139 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 09:01:36,139 INFO L82 PathProgramCache]: Analyzing trace with hash -41010676, now seen corresponding path program 2 times [2021-08-26 09:01:36,139 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 09:01:36,139 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [802068127] [2021-08-26 09:01:36,139 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 09:01:36,140 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 09:01:36,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:36,184 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:36,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:36,224 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:36,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:36,270 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:36,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:36,295 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-08-26 09:01:36,295 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 09:01:36,295 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [802068127] [2021-08-26 09:01:36,295 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [802068127] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:01:36,295 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [112609233] [2021-08-26 09:01:36,296 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-08-26 09:01:36,296 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 09:01:36,296 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-26 09:01:36,301 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) [2021-08-26 09:01:36,319 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-08-26 09:01:36,363 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-08-26 09:01:36,363 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-08-26 09:01:36,364 INFO L263 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 8 conjunts are in the unsatisfiable core [2021-08-26 09:01:36,365 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-26 09:01:36,526 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-08-26 09:01:36,527 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [112609233] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:01:36,527 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-26 09:01:36,527 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 8 [2021-08-26 09:01:36,527 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [596007812] [2021-08-26 09:01:36,528 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-08-26 09:01:36,528 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 09:01:36,528 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-08-26 09:01:36,529 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-08-26 09:01:36,529 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand has 8 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 8 states have internal predecessors, (16), 3 states have call successors, (3), 1 states have call predecessors, (3), 3 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-08-26 09:01:36,573 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 09:01:36,573 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2021-08-26 09:01:36,573 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-08-26 09:01:36,574 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 8 states have internal predecessors, (16), 3 states have call successors, (3), 1 states have call predecessors, (3), 3 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) Word has length 22 [2021-08-26 09:01:36,574 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 09:01:36,574 INFO L225 Difference]: With dead ends: 25 [2021-08-26 09:01:36,575 INFO L226 Difference]: Without dead ends: 21 [2021-08-26 09:01:36,575 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 48.0ms TimeCoverageRelationStatistics Valid=38, Invalid=72, Unknown=0, NotChecked=0, Total=110 [2021-08-26 09:01:36,575 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-08-26 09:01:36,578 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2021-08-26 09:01:36,579 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 14 states have (on average 1.0714285714285714) internal successors, (15), 15 states have internal predecessors, (15), 2 states have call successors, (2), 1 states have call predecessors, (2), 4 states have return successors, (5), 4 states have call predecessors, (5), 2 states have call successors, (5) [2021-08-26 09:01:36,579 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2021-08-26 09:01:36,579 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 22 [2021-08-26 09:01:36,579 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 09:01:36,580 INFO L470 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2021-08-26 09:01:36,580 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 8 states have internal predecessors, (16), 3 states have call successors, (3), 1 states have call predecessors, (3), 3 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-08-26 09:01:36,580 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2021-08-26 09:01:36,580 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-08-26 09:01:36,581 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 09:01:36,581 INFO L512 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 09:01:36,608 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-08-26 09:01:36,796 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 [2021-08-26 09:01:36,797 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 09:01:36,797 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 09:01:36,798 INFO L82 PathProgramCache]: Analyzing trace with hash 1769866774, now seen corresponding path program 3 times [2021-08-26 09:01:36,798 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 09:01:36,798 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1489879730] [2021-08-26 09:01:36,798 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 09:01:36,798 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 09:01:36,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:36,841 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:36,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:36,878 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:36,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:36,898 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:36,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:36,914 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:36,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:36,928 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-08-26 09:01:36,929 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 09:01:36,929 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1489879730] [2021-08-26 09:01:36,929 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1489879730] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:01:36,929 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1836464954] [2021-08-26 09:01:36,929 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-08-26 09:01:36,929 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 09:01:36,929 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-26 09:01:36,933 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) [2021-08-26 09:01:36,952 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-08-26 09:01:37,001 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-08-26 09:01:37,001 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-08-26 09:01:37,002 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 20 conjunts are in the unsatisfiable core [2021-08-26 09:01:37,004 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-26 09:01:37,323 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-08-26 09:01:37,323 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1836464954] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:01:37,323 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-26 09:01:37,323 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 13] total 18 [2021-08-26 09:01:37,324 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [286002849] [2021-08-26 09:01:37,325 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-08-26 09:01:37,325 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 09:01:37,326 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-08-26 09:01:37,327 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=256, Unknown=0, NotChecked=0, Total=306 [2021-08-26 09:01:37,327 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand has 18 states, 17 states have (on average 1.588235294117647) internal successors, (27), 14 states have internal predecessors, (27), 3 states have call successors, (3), 1 states have call predecessors, (3), 8 states have return successors, (8), 8 states have call predecessors, (8), 3 states have call successors, (8) [2021-08-26 09:01:37,550 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 09:01:37,550 INFO L93 Difference]: Finished difference Result 28 states and 29 transitions. [2021-08-26 09:01:37,551 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-08-26 09:01:37,551 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 1.588235294117647) internal successors, (27), 14 states have internal predecessors, (27), 3 states have call successors, (3), 1 states have call predecessors, (3), 8 states have return successors, (8), 8 states have call predecessors, (8), 3 states have call successors, (8) Word has length 28 [2021-08-26 09:01:37,551 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 09:01:37,552 INFO L225 Difference]: With dead ends: 28 [2021-08-26 09:01:37,552 INFO L226 Difference]: Without dead ends: 24 [2021-08-26 09:01:37,553 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 92 ImplicationChecksByTransitivity, 257.0ms TimeCoverageRelationStatistics Valid=130, Invalid=520, Unknown=0, NotChecked=0, Total=650 [2021-08-26 09:01:37,553 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-08-26 09:01:37,556 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2021-08-26 09:01:37,556 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 16 states have (on average 1.0625) internal successors, (17), 17 states have internal predecessors, (17), 2 states have call successors, (2), 1 states have call predecessors, (2), 5 states have return successors, (6), 5 states have call predecessors, (6), 2 states have call successors, (6) [2021-08-26 09:01:37,557 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2021-08-26 09:01:37,557 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 28 [2021-08-26 09:01:37,557 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 09:01:37,557 INFO L470 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2021-08-26 09:01:37,557 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 17 states have (on average 1.588235294117647) internal successors, (27), 14 states have internal predecessors, (27), 3 states have call successors, (3), 1 states have call predecessors, (3), 8 states have return successors, (8), 8 states have call predecessors, (8), 3 states have call successors, (8) [2021-08-26 09:01:37,558 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2021-08-26 09:01:37,558 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-08-26 09:01:37,558 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 09:01:37,558 INFO L512 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 09:01:37,575 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-08-26 09:01:37,768 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 [2021-08-26 09:01:37,769 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 09:01:37,769 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 09:01:37,769 INFO L82 PathProgramCache]: Analyzing trace with hash 371264716, now seen corresponding path program 4 times [2021-08-26 09:01:37,769 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 09:01:37,769 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [607165146] [2021-08-26 09:01:37,769 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 09:01:37,769 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 09:01:37,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:37,814 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:37,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:37,856 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:37,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:37,897 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:37,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:37,914 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:37,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:37,931 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:37,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:37,951 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-08-26 09:01:37,952 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 09:01:37,952 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [607165146] [2021-08-26 09:01:37,952 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [607165146] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:01:37,952 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1480034017] [2021-08-26 09:01:37,952 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-08-26 09:01:37,953 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 09:01:37,953 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-26 09:01:37,956 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) [2021-08-26 09:01:37,958 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-08-26 09:01:38,047 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-08-26 09:01:38,047 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-08-26 09:01:38,048 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 12 conjunts are in the unsatisfiable core [2021-08-26 09:01:38,050 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-26 09:01:38,257 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-08-26 09:01:38,258 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1480034017] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:01:38,258 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-26 09:01:38,258 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 10 [2021-08-26 09:01:38,258 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1655874749] [2021-08-26 09:01:38,258 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-08-26 09:01:38,258 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 09:01:38,259 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-08-26 09:01:38,259 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2021-08-26 09:01:38,259 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand has 10 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 10 states have internal predecessors, (20), 3 states have call successors, (3), 1 states have call predecessors, (3), 5 states have return successors, (9), 5 states have call predecessors, (9), 3 states have call successors, (9) [2021-08-26 09:01:38,329 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 09:01:38,329 INFO L93 Difference]: Finished difference Result 31 states and 32 transitions. [2021-08-26 09:01:38,329 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-08-26 09:01:38,330 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 10 states have internal predecessors, (20), 3 states have call successors, (3), 1 states have call predecessors, (3), 5 states have return successors, (9), 5 states have call predecessors, (9), 3 states have call successors, (9) Word has length 34 [2021-08-26 09:01:38,330 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 09:01:38,330 INFO L225 Difference]: With dead ends: 31 [2021-08-26 09:01:38,331 INFO L226 Difference]: Without dead ends: 27 [2021-08-26 09:01:38,331 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 87.7ms TimeCoverageRelationStatistics Valid=73, Invalid=137, Unknown=0, NotChecked=0, Total=210 [2021-08-26 09:01:38,331 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-08-26 09:01:38,334 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2021-08-26 09:01:38,335 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 18 states have (on average 1.0555555555555556) internal successors, (19), 19 states have internal predecessors, (19), 2 states have call successors, (2), 1 states have call predecessors, (2), 6 states have return successors, (7), 6 states have call predecessors, (7), 2 states have call successors, (7) [2021-08-26 09:01:38,339 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2021-08-26 09:01:38,339 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 34 [2021-08-26 09:01:38,340 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 09:01:38,340 INFO L470 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2021-08-26 09:01:38,340 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 10 states have internal predecessors, (20), 3 states have call successors, (3), 1 states have call predecessors, (3), 5 states have return successors, (9), 5 states have call predecessors, (9), 3 states have call successors, (9) [2021-08-26 09:01:38,340 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2021-08-26 09:01:38,341 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-08-26 09:01:38,341 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 09:01:38,341 INFO L512 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 09:01:38,368 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-08-26 09:01:38,557 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 09:01:38,557 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 09:01:38,557 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 09:01:38,557 INFO L82 PathProgramCache]: Analyzing trace with hash -886339242, now seen corresponding path program 5 times [2021-08-26 09:01:38,558 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 09:01:38,558 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1664520384] [2021-08-26 09:01:38,558 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 09:01:38,558 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 09:01:38,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:38,590 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:38,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:38,624 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:38,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:38,659 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:38,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:38,685 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:38,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:38,707 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:38,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:38,735 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:38,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:38,749 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-08-26 09:01:38,750 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 09:01:38,750 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1664520384] [2021-08-26 09:01:38,750 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1664520384] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:01:38,750 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1380304276] [2021-08-26 09:01:38,750 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-08-26 09:01:38,750 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 09:01:38,751 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-26 09:01:38,751 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) [2021-08-26 09:01:38,773 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-08-26 09:01:38,874 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-08-26 09:01:38,874 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-08-26 09:01:38,875 INFO L263 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 14 conjunts are in the unsatisfiable core [2021-08-26 09:01:38,878 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-26 09:01:39,076 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-08-26 09:01:39,076 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1380304276] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:01:39,076 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-26 09:01:39,076 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 11 [2021-08-26 09:01:39,077 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1925276152] [2021-08-26 09:01:39,078 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-08-26 09:01:39,078 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 09:01:39,078 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-08-26 09:01:39,079 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=75, Unknown=0, NotChecked=0, Total=110 [2021-08-26 09:01:39,079 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand has 11 states, 10 states have (on average 2.2) internal successors, (22), 11 states have internal predecessors, (22), 3 states have call successors, (3), 1 states have call predecessors, (3), 6 states have return successors, (11), 6 states have call predecessors, (11), 3 states have call successors, (11) [2021-08-26 09:01:39,171 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 09:01:39,172 INFO L93 Difference]: Finished difference Result 34 states and 35 transitions. [2021-08-26 09:01:39,172 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-08-26 09:01:39,172 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 2.2) internal successors, (22), 11 states have internal predecessors, (22), 3 states have call successors, (3), 1 states have call predecessors, (3), 6 states have return successors, (11), 6 states have call predecessors, (11), 3 states have call successors, (11) Word has length 40 [2021-08-26 09:01:39,172 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 09:01:39,173 INFO L225 Difference]: With dead ends: 34 [2021-08-26 09:01:39,174 INFO L226 Difference]: Without dead ends: 30 [2021-08-26 09:01:39,174 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 92.6ms TimeCoverageRelationStatistics Valid=95, Invalid=177, Unknown=0, NotChecked=0, Total=272 [2021-08-26 09:01:39,175 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-08-26 09:01:39,184 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2021-08-26 09:01:39,185 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 20 states have (on average 1.05) internal successors, (21), 21 states have internal predecessors, (21), 2 states have call successors, (2), 1 states have call predecessors, (2), 7 states have return successors, (8), 7 states have call predecessors, (8), 2 states have call successors, (8) [2021-08-26 09:01:39,186 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2021-08-26 09:01:39,186 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 40 [2021-08-26 09:01:39,187 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 09:01:39,187 INFO L470 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2021-08-26 09:01:39,188 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 2.2) internal successors, (22), 11 states have internal predecessors, (22), 3 states have call successors, (3), 1 states have call predecessors, (3), 6 states have return successors, (11), 6 states have call predecessors, (11), 3 states have call successors, (11) [2021-08-26 09:01:39,188 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2021-08-26 09:01:39,189 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-08-26 09:01:39,189 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 09:01:39,189 INFO L512 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 09:01:39,214 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-08-26 09:01:39,412 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 09:01:39,412 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 09:01:39,412 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 09:01:39,412 INFO L82 PathProgramCache]: Analyzing trace with hash -918712436, now seen corresponding path program 6 times [2021-08-26 09:01:39,413 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 09:01:39,413 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [893686109] [2021-08-26 09:01:39,413 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 09:01:39,413 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 09:01:39,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:39,439 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:39,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:39,471 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:39,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:39,493 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:39,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:39,527 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:39,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:39,549 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:39,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:39,570 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:39,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:39,590 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:39,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:39,613 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-08-26 09:01:39,614 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 09:01:39,614 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [893686109] [2021-08-26 09:01:39,614 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [893686109] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:01:39,617 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1508454553] [2021-08-26 09:01:39,617 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-08-26 09:01:39,617 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 09:01:39,618 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-26 09:01:39,621 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) [2021-08-26 09:01:39,648 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-08-26 09:01:39,753 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2021-08-26 09:01:39,753 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-08-26 09:01:39,754 INFO L263 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 32 conjunts are in the unsatisfiable core [2021-08-26 09:01:39,756 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-26 09:01:40,186 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-08-26 09:01:40,186 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1508454553] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:01:40,186 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-26 09:01:40,186 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 19] total 27 [2021-08-26 09:01:40,186 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1976753719] [2021-08-26 09:01:40,187 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-08-26 09:01:40,187 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 09:01:40,187 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-08-26 09:01:40,188 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=592, Unknown=0, NotChecked=0, Total=702 [2021-08-26 09:01:40,188 INFO L87 Difference]: Start difference. First operand 30 states and 31 transitions. Second operand has 27 states, 26 states have (on average 1.5) internal successors, (39), 20 states have internal predecessors, (39), 3 states have call successors, (3), 1 states have call predecessors, (3), 14 states have return successors, (14), 14 states have call predecessors, (14), 3 states have call successors, (14) [2021-08-26 09:01:40,507 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 09:01:40,507 INFO L93 Difference]: Finished difference Result 37 states and 38 transitions. [2021-08-26 09:01:40,508 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-08-26 09:01:40,508 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 26 states have (on average 1.5) internal successors, (39), 20 states have internal predecessors, (39), 3 states have call successors, (3), 1 states have call predecessors, (3), 14 states have return successors, (14), 14 states have call predecessors, (14), 3 states have call successors, (14) Word has length 46 [2021-08-26 09:01:40,508 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 09:01:40,509 INFO L225 Difference]: With dead ends: 37 [2021-08-26 09:01:40,509 INFO L226 Difference]: Without dead ends: 33 [2021-08-26 09:01:40,510 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 290 ImplicationChecksByTransitivity, 487.6ms TimeCoverageRelationStatistics Valid=313, Invalid=1327, Unknown=0, NotChecked=0, Total=1640 [2021-08-26 09:01:40,510 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-08-26 09:01:40,513 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2021-08-26 09:01:40,513 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 22 states have (on average 1.0454545454545454) internal successors, (23), 23 states have internal predecessors, (23), 2 states have call successors, (2), 1 states have call predecessors, (2), 8 states have return successors, (9), 8 states have call predecessors, (9), 2 states have call successors, (9) [2021-08-26 09:01:40,514 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2021-08-26 09:01:40,514 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 46 [2021-08-26 09:01:40,514 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 09:01:40,514 INFO L470 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2021-08-26 09:01:40,514 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 26 states have (on average 1.5) internal successors, (39), 20 states have internal predecessors, (39), 3 states have call successors, (3), 1 states have call predecessors, (3), 14 states have return successors, (14), 14 states have call predecessors, (14), 3 states have call successors, (14) [2021-08-26 09:01:40,514 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2021-08-26 09:01:40,515 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-08-26 09:01:40,515 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 09:01:40,515 INFO L512 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 09:01:40,541 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-08-26 09:01:40,740 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 09:01:40,741 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 09:01:40,741 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 09:01:40,741 INFO L82 PathProgramCache]: Analyzing trace with hash -626238314, now seen corresponding path program 7 times [2021-08-26 09:01:40,741 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 09:01:40,741 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1343432004] [2021-08-26 09:01:40,741 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 09:01:40,742 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 09:01:40,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:40,768 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:40,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:40,791 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:40,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:40,811 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:40,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:40,832 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:40,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:40,851 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:40,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:40,867 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:40,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:40,885 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:40,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:40,901 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:40,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:40,917 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-08-26 09:01:40,918 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 09:01:40,918 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1343432004] [2021-08-26 09:01:40,918 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1343432004] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:01:40,918 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1051524699] [2021-08-26 09:01:40,918 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-08-26 09:01:40,919 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 09:01:40,919 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-26 09:01:40,920 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-26 09:01:40,928 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-08-26 09:01:41,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:41,073 INFO L263 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 18 conjunts are in the unsatisfiable core [2021-08-26 09:01:41,084 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-26 09:01:41,267 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-08-26 09:01:41,267 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1051524699] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:01:41,267 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-26 09:01:41,267 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 13 [2021-08-26 09:01:41,267 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [256288219] [2021-08-26 09:01:41,268 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-08-26 09:01:41,268 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 09:01:41,268 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-08-26 09:01:41,268 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=104, Unknown=0, NotChecked=0, Total=156 [2021-08-26 09:01:41,269 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand has 13 states, 12 states have (on average 2.1666666666666665) internal successors, (26), 13 states have internal predecessors, (26), 3 states have call successors, (3), 1 states have call predecessors, (3), 8 states have return successors, (15), 8 states have call predecessors, (15), 3 states have call successors, (15) [2021-08-26 09:01:41,360 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 09:01:41,360 INFO L93 Difference]: Finished difference Result 40 states and 41 transitions. [2021-08-26 09:01:41,361 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-08-26 09:01:41,361 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 2.1666666666666665) internal successors, (26), 13 states have internal predecessors, (26), 3 states have call successors, (3), 1 states have call predecessors, (3), 8 states have return successors, (15), 8 states have call predecessors, (15), 3 states have call successors, (15) Word has length 52 [2021-08-26 09:01:41,361 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 09:01:41,362 INFO L225 Difference]: With dead ends: 40 [2021-08-26 09:01:41,362 INFO L226 Difference]: Without dead ends: 36 [2021-08-26 09:01:41,362 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 67 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 118.1ms TimeCoverageRelationStatistics Valid=148, Invalid=272, Unknown=0, NotChecked=0, Total=420 [2021-08-26 09:01:41,362 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-08-26 09:01:41,365 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2021-08-26 09:01:41,365 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 24 states have (on average 1.0416666666666667) internal successors, (25), 25 states have internal predecessors, (25), 2 states have call successors, (2), 1 states have call predecessors, (2), 9 states have return successors, (10), 9 states have call predecessors, (10), 2 states have call successors, (10) [2021-08-26 09:01:41,366 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2021-08-26 09:01:41,366 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 52 [2021-08-26 09:01:41,366 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 09:01:41,366 INFO L470 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2021-08-26 09:01:41,366 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 12 states have (on average 2.1666666666666665) internal successors, (26), 13 states have internal predecessors, (26), 3 states have call successors, (3), 1 states have call predecessors, (3), 8 states have return successors, (15), 8 states have call predecessors, (15), 3 states have call successors, (15) [2021-08-26 09:01:41,366 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2021-08-26 09:01:41,367 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-08-26 09:01:41,367 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 09:01:41,367 INFO L512 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 09:01:41,393 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-08-26 09:01:41,588 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 09:01:41,589 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 09:01:41,589 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 09:01:41,589 INFO L82 PathProgramCache]: Analyzing trace with hash -960511412, now seen corresponding path program 8 times [2021-08-26 09:01:41,589 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 09:01:41,590 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1983590827] [2021-08-26 09:01:41,590 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 09:01:41,590 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 09:01:41,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:41,615 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:41,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:41,640 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:41,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:41,661 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:41,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:41,681 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:41,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:41,701 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:41,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:41,719 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:41,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:41,737 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:41,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:41,755 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:41,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:41,772 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:41,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:41,789 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-08-26 09:01:41,789 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 09:01:41,789 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1983590827] [2021-08-26 09:01:41,789 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1983590827] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:01:41,789 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1931325052] [2021-08-26 09:01:41,789 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-08-26 09:01:41,790 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 09:01:41,790 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-26 09:01:41,790 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-26 09:01:41,823 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-08-26 09:01:41,959 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-08-26 09:01:41,959 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-08-26 09:01:41,960 INFO L263 TraceCheckSpWp]: Trace formula consists of 202 conjuncts, 20 conjunts are in the unsatisfiable core [2021-08-26 09:01:41,962 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-26 09:01:42,232 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-08-26 09:01:42,232 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1931325052] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:01:42,232 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-26 09:01:42,233 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 14 [2021-08-26 09:01:42,235 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [493864861] [2021-08-26 09:01:42,235 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-08-26 09:01:42,235 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 09:01:42,236 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-08-26 09:01:42,236 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=120, Unknown=0, NotChecked=0, Total=182 [2021-08-26 09:01:42,237 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand has 14 states, 13 states have (on average 2.1538461538461537) internal successors, (28), 14 states have internal predecessors, (28), 3 states have call successors, (3), 1 states have call predecessors, (3), 9 states have return successors, (17), 9 states have call predecessors, (17), 3 states have call successors, (17) [2021-08-26 09:01:42,355 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 09:01:42,355 INFO L93 Difference]: Finished difference Result 43 states and 44 transitions. [2021-08-26 09:01:42,356 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-08-26 09:01:42,356 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 2.1538461538461537) internal successors, (28), 14 states have internal predecessors, (28), 3 states have call successors, (3), 1 states have call predecessors, (3), 9 states have return successors, (17), 9 states have call predecessors, (17), 3 states have call successors, (17) Word has length 58 [2021-08-26 09:01:42,357 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 09:01:42,357 INFO L225 Difference]: With dead ends: 43 [2021-08-26 09:01:42,357 INFO L226 Difference]: Without dead ends: 39 [2021-08-26 09:01:42,358 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 75 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 72 ImplicationChecksByTransitivity, 138.4ms TimeCoverageRelationStatistics Valid=179, Invalid=327, Unknown=0, NotChecked=0, Total=506 [2021-08-26 09:01:42,358 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2021-08-26 09:01:42,361 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2021-08-26 09:01:42,361 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 26 states have (on average 1.0384615384615385) internal successors, (27), 27 states have internal predecessors, (27), 2 states have call successors, (2), 1 states have call predecessors, (2), 10 states have return successors, (11), 10 states have call predecessors, (11), 2 states have call successors, (11) [2021-08-26 09:01:42,361 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2021-08-26 09:01:42,362 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 58 [2021-08-26 09:01:42,362 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 09:01:42,362 INFO L470 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2021-08-26 09:01:42,362 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 13 states have (on average 2.1538461538461537) internal successors, (28), 14 states have internal predecessors, (28), 3 states have call successors, (3), 1 states have call predecessors, (3), 9 states have return successors, (17), 9 states have call predecessors, (17), 3 states have call successors, (17) [2021-08-26 09:01:42,362 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2021-08-26 09:01:42,363 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-08-26 09:01:42,363 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 09:01:42,363 INFO L512 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 09:01:42,385 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-08-26 09:01:42,585 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2021-08-26 09:01:42,585 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 09:01:42,586 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 09:01:42,586 INFO L82 PathProgramCache]: Analyzing trace with hash -366706730, now seen corresponding path program 9 times [2021-08-26 09:01:42,586 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 09:01:42,586 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [136473571] [2021-08-26 09:01:42,586 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 09:01:42,586 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 09:01:42,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:42,613 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:42,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:42,641 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:42,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:42,669 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:42,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:42,691 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:42,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:42,711 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:42,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:42,731 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:42,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:42,756 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:42,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:42,775 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:42,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:42,793 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:42,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:42,811 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:42,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:42,830 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2021-08-26 09:01:42,830 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 09:01:42,830 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [136473571] [2021-08-26 09:01:42,831 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [136473571] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:01:42,831 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1146414476] [2021-08-26 09:01:42,831 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-08-26 09:01:42,831 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 09:01:42,831 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-26 09:01:42,833 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-26 09:01:42,834 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-08-26 09:01:43,044 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2021-08-26 09:01:43,045 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-08-26 09:01:43,046 INFO L263 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 44 conjunts are in the unsatisfiable core [2021-08-26 09:01:43,049 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-26 09:01:43,713 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2021-08-26 09:01:43,713 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1146414476] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:01:43,713 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-26 09:01:43,713 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 25] total 36 [2021-08-26 09:01:43,713 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [480079751] [2021-08-26 09:01:43,714 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-08-26 09:01:43,714 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 09:01:43,714 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-08-26 09:01:43,715 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=197, Invalid=1063, Unknown=0, NotChecked=0, Total=1260 [2021-08-26 09:01:43,715 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand has 36 states, 35 states have (on average 1.457142857142857) internal successors, (51), 26 states have internal predecessors, (51), 3 states have call successors, (3), 1 states have call predecessors, (3), 20 states have return successors, (20), 20 states have call predecessors, (20), 3 states have call successors, (20) [2021-08-26 09:01:44,155 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 09:01:44,155 INFO L93 Difference]: Finished difference Result 46 states and 47 transitions. [2021-08-26 09:01:44,155 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-08-26 09:01:44,155 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 35 states have (on average 1.457142857142857) internal successors, (51), 26 states have internal predecessors, (51), 3 states have call successors, (3), 1 states have call predecessors, (3), 20 states have return successors, (20), 20 states have call predecessors, (20), 3 states have call successors, (20) Word has length 64 [2021-08-26 09:01:44,155 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 09:01:44,156 INFO L225 Difference]: With dead ends: 46 [2021-08-26 09:01:44,156 INFO L226 Difference]: Without dead ends: 42 [2021-08-26 09:01:44,157 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 62 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 596 ImplicationChecksByTransitivity, 766.9ms TimeCoverageRelationStatistics Valid=577, Invalid=2503, Unknown=0, NotChecked=0, Total=3080 [2021-08-26 09:01:44,157 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-08-26 09:01:44,160 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2021-08-26 09:01:44,160 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 28 states have (on average 1.0357142857142858) internal successors, (29), 29 states have internal predecessors, (29), 2 states have call successors, (2), 1 states have call predecessors, (2), 11 states have return successors, (12), 11 states have call predecessors, (12), 2 states have call successors, (12) [2021-08-26 09:01:44,161 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 43 transitions. [2021-08-26 09:01:44,161 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 43 transitions. Word has length 64 [2021-08-26 09:01:44,161 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 09:01:44,161 INFO L470 AbstractCegarLoop]: Abstraction has 42 states and 43 transitions. [2021-08-26 09:01:44,161 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 35 states have (on average 1.457142857142857) internal successors, (51), 26 states have internal predecessors, (51), 3 states have call successors, (3), 1 states have call predecessors, (3), 20 states have return successors, (20), 20 states have call predecessors, (20), 3 states have call successors, (20) [2021-08-26 09:01:44,161 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 43 transitions. [2021-08-26 09:01:44,162 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-08-26 09:01:44,162 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 09:01:44,162 INFO L512 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 09:01:44,186 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-08-26 09:01:44,386 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-08-26 09:01:44,386 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 09:01:44,386 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 09:01:44,386 INFO L82 PathProgramCache]: Analyzing trace with hash -1719425780, now seen corresponding path program 10 times [2021-08-26 09:01:44,387 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 09:01:44,387 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1643777388] [2021-08-26 09:01:44,387 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 09:01:44,387 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 09:01:44,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:44,414 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:44,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:44,439 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:44,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:44,461 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:44,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:44,484 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:44,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:44,505 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:44,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:44,531 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:44,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:44,549 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:44,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:44,567 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:44,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:44,585 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:44,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:44,602 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:44,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:44,619 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:44,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:44,636 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2021-08-26 09:01:44,636 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 09:01:44,636 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1643777388] [2021-08-26 09:01:44,637 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1643777388] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:01:44,637 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [151238000] [2021-08-26 09:01:44,637 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-08-26 09:01:44,637 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 09:01:44,637 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-26 09:01:44,641 INFO L229 MonitoredProcess]: Starting monitored process 11 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-26 09:01:44,673 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-08-26 09:01:44,878 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-08-26 09:01:44,878 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-08-26 09:01:44,879 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 24 conjunts are in the unsatisfiable core [2021-08-26 09:01:44,886 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-26 09:01:45,140 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2021-08-26 09:01:45,140 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [151238000] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:01:45,140 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-26 09:01:45,140 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 16 [2021-08-26 09:01:45,140 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [256687829] [2021-08-26 09:01:45,141 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-08-26 09:01:45,141 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 09:01:45,141 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-08-26 09:01:45,142 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=155, Unknown=0, NotChecked=0, Total=240 [2021-08-26 09:01:45,142 INFO L87 Difference]: Start difference. First operand 42 states and 43 transitions. Second operand has 16 states, 15 states have (on average 2.1333333333333333) internal successors, (32), 16 states have internal predecessors, (32), 3 states have call successors, (3), 1 states have call predecessors, (3), 11 states have return successors, (21), 11 states have call predecessors, (21), 3 states have call successors, (21) [2021-08-26 09:01:45,268 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 09:01:45,268 INFO L93 Difference]: Finished difference Result 49 states and 50 transitions. [2021-08-26 09:01:45,269 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-08-26 09:01:45,269 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 2.1333333333333333) internal successors, (32), 16 states have internal predecessors, (32), 3 states have call successors, (3), 1 states have call predecessors, (3), 11 states have return successors, (21), 11 states have call predecessors, (21), 3 states have call successors, (21) Word has length 70 [2021-08-26 09:01:45,269 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 09:01:45,270 INFO L225 Difference]: With dead ends: 49 [2021-08-26 09:01:45,270 INFO L226 Difference]: Without dead ends: 45 [2021-08-26 09:01:45,270 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 91 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 110 ImplicationChecksByTransitivity, 162.4ms TimeCoverageRelationStatistics Valid=250, Invalid=452, Unknown=0, NotChecked=0, Total=702 [2021-08-26 09:01:45,271 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-08-26 09:01:45,273 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2021-08-26 09:01:45,274 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 30 states have (on average 1.0333333333333334) internal successors, (31), 31 states have internal predecessors, (31), 2 states have call successors, (2), 1 states have call predecessors, (2), 12 states have return successors, (13), 12 states have call predecessors, (13), 2 states have call successors, (13) [2021-08-26 09:01:45,274 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 46 transitions. [2021-08-26 09:01:45,274 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 46 transitions. Word has length 70 [2021-08-26 09:01:45,274 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 09:01:45,274 INFO L470 AbstractCegarLoop]: Abstraction has 45 states and 46 transitions. [2021-08-26 09:01:45,275 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 15 states have (on average 2.1333333333333333) internal successors, (32), 16 states have internal predecessors, (32), 3 states have call successors, (3), 1 states have call predecessors, (3), 11 states have return successors, (21), 11 states have call predecessors, (21), 3 states have call successors, (21) [2021-08-26 09:01:45,275 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 46 transitions. [2021-08-26 09:01:45,275 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-08-26 09:01:45,275 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 09:01:45,276 INFO L512 BasicCegarLoop]: trace histogram [12, 12, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 09:01:45,296 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-08-26 09:01:45,489 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-08-26 09:01:45,489 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 09:01:45,489 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 09:01:45,489 INFO L82 PathProgramCache]: Analyzing trace with hash 1354232598, now seen corresponding path program 11 times [2021-08-26 09:01:45,489 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 09:01:45,489 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1369601438] [2021-08-26 09:01:45,490 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 09:01:45,490 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 09:01:45,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:45,533 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:45,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:45,562 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:45,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:45,586 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:45,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:45,611 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:45,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:45,632 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:45,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:45,654 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:45,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:45,674 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:45,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:45,695 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:45,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:45,714 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:45,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:45,733 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:45,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:45,752 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:45,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:45,771 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:45,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:45,790 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2021-08-26 09:01:45,791 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 09:01:45,791 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1369601438] [2021-08-26 09:01:45,791 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1369601438] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:01:45,791 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1811711191] [2021-08-26 09:01:45,791 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-08-26 09:01:45,791 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 09:01:45,791 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-26 09:01:45,792 INFO L229 MonitoredProcess]: Starting monitored process 12 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-26 09:01:45,793 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-08-26 09:01:46,082 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2021-08-26 09:01:46,082 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-08-26 09:01:46,083 INFO L263 TraceCheckSpWp]: Trace formula consists of 256 conjuncts, 26 conjunts are in the unsatisfiable core [2021-08-26 09:01:46,085 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-26 09:01:46,351 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2021-08-26 09:01:46,351 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1811711191] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:01:46,351 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-26 09:01:46,352 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 17 [2021-08-26 09:01:46,352 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [444729890] [2021-08-26 09:01:46,352 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-08-26 09:01:46,352 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 09:01:46,353 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-08-26 09:01:46,353 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=174, Unknown=0, NotChecked=0, Total=272 [2021-08-26 09:01:46,353 INFO L87 Difference]: Start difference. First operand 45 states and 46 transitions. Second operand has 17 states, 16 states have (on average 2.125) internal successors, (34), 17 states have internal predecessors, (34), 3 states have call successors, (3), 1 states have call predecessors, (3), 12 states have return successors, (23), 12 states have call predecessors, (23), 3 states have call successors, (23) [2021-08-26 09:01:46,503 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 09:01:46,504 INFO L93 Difference]: Finished difference Result 52 states and 53 transitions. [2021-08-26 09:01:46,504 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-08-26 09:01:46,504 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 2.125) internal successors, (34), 17 states have internal predecessors, (34), 3 states have call successors, (3), 1 states have call predecessors, (3), 12 states have return successors, (23), 12 states have call predecessors, (23), 3 states have call successors, (23) Word has length 76 [2021-08-26 09:01:46,505 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 09:01:46,505 INFO L225 Difference]: With dead ends: 52 [2021-08-26 09:01:46,505 INFO L226 Difference]: Without dead ends: 48 [2021-08-26 09:01:46,506 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 99 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 132 ImplicationChecksByTransitivity, 192.3ms TimeCoverageRelationStatistics Valid=290, Invalid=522, Unknown=0, NotChecked=0, Total=812 [2021-08-26 09:01:46,506 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-08-26 09:01:46,509 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2021-08-26 09:01:46,509 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 32 states have (on average 1.03125) internal successors, (33), 33 states have internal predecessors, (33), 2 states have call successors, (2), 1 states have call predecessors, (2), 13 states have return successors, (14), 13 states have call predecessors, (14), 2 states have call successors, (14) [2021-08-26 09:01:46,510 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 49 transitions. [2021-08-26 09:01:46,510 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 49 transitions. Word has length 76 [2021-08-26 09:01:46,510 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 09:01:46,510 INFO L470 AbstractCegarLoop]: Abstraction has 48 states and 49 transitions. [2021-08-26 09:01:46,511 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 16 states have (on average 2.125) internal successors, (34), 17 states have internal predecessors, (34), 3 states have call successors, (3), 1 states have call predecessors, (3), 12 states have return successors, (23), 12 states have call predecessors, (23), 3 states have call successors, (23) [2021-08-26 09:01:46,511 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 49 transitions. [2021-08-26 09:01:46,511 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-08-26 09:01:46,512 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 09:01:46,512 INFO L512 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 09:01:46,530 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-08-26 09:01:46,720 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-08-26 09:01:46,721 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 09:01:46,721 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 09:01:46,721 INFO L82 PathProgramCache]: Analyzing trace with hash 1734686668, now seen corresponding path program 12 times [2021-08-26 09:01:46,721 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 09:01:46,721 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [329223103] [2021-08-26 09:01:46,721 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 09:01:46,721 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 09:01:46,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:46,751 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:46,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:46,780 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:46,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:46,815 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:46,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:46,851 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:46,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:46,875 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:46,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:46,899 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:46,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:46,920 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:46,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:46,940 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:46,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:46,959 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:46,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:46,983 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:46,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:47,002 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:47,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:47,021 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:47,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:47,073 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:47,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:47,092 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2021-08-26 09:01:47,092 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 09:01:47,092 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [329223103] [2021-08-26 09:01:47,093 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [329223103] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:01:47,093 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2261204] [2021-08-26 09:01:47,093 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-08-26 09:01:47,093 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 09:01:47,093 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-26 09:01:47,094 INFO L229 MonitoredProcess]: Starting monitored process 13 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-26 09:01:47,123 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-08-26 09:01:47,438 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2021-08-26 09:01:47,438 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-08-26 09:01:47,440 INFO L263 TraceCheckSpWp]: Trace formula consists of 274 conjuncts, 28 conjunts are in the unsatisfiable core [2021-08-26 09:01:47,441 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-26 09:01:47,745 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2021-08-26 09:01:47,745 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2261204] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:01:47,745 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-26 09:01:47,746 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 18 [2021-08-26 09:01:47,746 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1103005614] [2021-08-26 09:01:47,746 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-08-26 09:01:47,751 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 09:01:47,752 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-08-26 09:01:47,752 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=194, Unknown=0, NotChecked=0, Total=306 [2021-08-26 09:01:47,752 INFO L87 Difference]: Start difference. First operand 48 states and 49 transitions. Second operand has 18 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 18 states have internal predecessors, (36), 3 states have call successors, (3), 1 states have call predecessors, (3), 13 states have return successors, (25), 13 states have call predecessors, (25), 3 states have call successors, (25) [2021-08-26 09:01:47,891 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 09:01:47,891 INFO L93 Difference]: Finished difference Result 55 states and 56 transitions. [2021-08-26 09:01:47,891 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-08-26 09:01:47,891 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 18 states have internal predecessors, (36), 3 states have call successors, (3), 1 states have call predecessors, (3), 13 states have return successors, (25), 13 states have call predecessors, (25), 3 states have call successors, (25) Word has length 82 [2021-08-26 09:01:47,892 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 09:01:47,892 INFO L225 Difference]: With dead ends: 55 [2021-08-26 09:01:47,892 INFO L226 Difference]: Without dead ends: 51 [2021-08-26 09:01:47,893 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 107 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 156 ImplicationChecksByTransitivity, 205.9ms TimeCoverageRelationStatistics Valid=333, Invalid=597, Unknown=0, NotChecked=0, Total=930 [2021-08-26 09:01:47,893 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-08-26 09:01:47,903 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2021-08-26 09:01:47,903 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 34 states have (on average 1.0294117647058822) internal successors, (35), 35 states have internal predecessors, (35), 2 states have call successors, (2), 1 states have call predecessors, (2), 14 states have return successors, (15), 14 states have call predecessors, (15), 2 states have call successors, (15) [2021-08-26 09:01:47,904 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 52 transitions. [2021-08-26 09:01:47,904 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 52 transitions. Word has length 82 [2021-08-26 09:01:47,904 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 09:01:47,904 INFO L470 AbstractCegarLoop]: Abstraction has 51 states and 52 transitions. [2021-08-26 09:01:47,905 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 18 states have internal predecessors, (36), 3 states have call successors, (3), 1 states have call predecessors, (3), 13 states have return successors, (25), 13 states have call predecessors, (25), 3 states have call successors, (25) [2021-08-26 09:01:47,905 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 52 transitions. [2021-08-26 09:01:47,905 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-08-26 09:01:47,907 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 09:01:47,907 INFO L512 BasicCegarLoop]: trace histogram [14, 14, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 09:01:47,932 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-08-26 09:01:48,131 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-08-26 09:01:48,132 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 09:01:48,132 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 09:01:48,132 INFO L82 PathProgramCache]: Analyzing trace with hash -1433749930, now seen corresponding path program 13 times [2021-08-26 09:01:48,132 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 09:01:48,132 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [239256092] [2021-08-26 09:01:48,132 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 09:01:48,132 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 09:01:48,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:48,165 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:48,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:48,195 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:48,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:48,223 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:48,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:48,248 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:48,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:48,272 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:48,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:48,297 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:48,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:48,321 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:48,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:48,343 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:48,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:48,371 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:48,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:48,392 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:48,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:48,413 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:48,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:48,434 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:48,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:48,454 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:48,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:48,475 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:48,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:48,497 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2021-08-26 09:01:48,497 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 09:01:48,497 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [239256092] [2021-08-26 09:01:48,498 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [239256092] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:01:48,498 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [74457495] [2021-08-26 09:01:48,498 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-08-26 09:01:48,498 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 09:01:48,498 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-26 09:01:48,499 INFO L229 MonitoredProcess]: Starting monitored process 14 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-26 09:01:48,500 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-08-26 09:01:48,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:48,857 INFO L263 TraceCheckSpWp]: Trace formula consists of 292 conjuncts, 30 conjunts are in the unsatisfiable core [2021-08-26 09:01:48,861 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-26 09:01:49,160 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2021-08-26 09:01:49,160 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [74457495] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:01:49,160 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-26 09:01:49,161 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 19 [2021-08-26 09:01:49,161 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1660935470] [2021-08-26 09:01:49,161 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-08-26 09:01:49,161 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 09:01:49,162 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-08-26 09:01:49,162 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=127, Invalid=215, Unknown=0, NotChecked=0, Total=342 [2021-08-26 09:01:49,162 INFO L87 Difference]: Start difference. First operand 51 states and 52 transitions. Second operand has 19 states, 18 states have (on average 2.111111111111111) internal successors, (38), 19 states have internal predecessors, (38), 3 states have call successors, (3), 1 states have call predecessors, (3), 14 states have return successors, (27), 14 states have call predecessors, (27), 3 states have call successors, (27) [2021-08-26 09:01:49,343 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 09:01:49,343 INFO L93 Difference]: Finished difference Result 58 states and 59 transitions. [2021-08-26 09:01:49,343 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-08-26 09:01:49,344 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 2.111111111111111) internal successors, (38), 19 states have internal predecessors, (38), 3 states have call successors, (3), 1 states have call predecessors, (3), 14 states have return successors, (27), 14 states have call predecessors, (27), 3 states have call successors, (27) Word has length 88 [2021-08-26 09:01:49,344 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 09:01:49,344 INFO L225 Difference]: With dead ends: 58 [2021-08-26 09:01:49,344 INFO L226 Difference]: Without dead ends: 54 [2021-08-26 09:01:49,345 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 115 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 182 ImplicationChecksByTransitivity, 286.5ms TimeCoverageRelationStatistics Valid=379, Invalid=677, Unknown=0, NotChecked=0, Total=1056 [2021-08-26 09:01:49,345 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-08-26 09:01:49,347 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2021-08-26 09:01:49,348 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 36 states have (on average 1.0277777777777777) internal successors, (37), 37 states have internal predecessors, (37), 2 states have call successors, (2), 1 states have call predecessors, (2), 15 states have return successors, (16), 15 states have call predecessors, (16), 2 states have call successors, (16) [2021-08-26 09:01:49,348 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 55 transitions. [2021-08-26 09:01:49,348 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 55 transitions. Word has length 88 [2021-08-26 09:01:49,348 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 09:01:49,348 INFO L470 AbstractCegarLoop]: Abstraction has 54 states and 55 transitions. [2021-08-26 09:01:49,348 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 18 states have (on average 2.111111111111111) internal successors, (38), 19 states have internal predecessors, (38), 3 states have call successors, (3), 1 states have call predecessors, (3), 14 states have return successors, (27), 14 states have call predecessors, (27), 3 states have call successors, (27) [2021-08-26 09:01:49,349 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 55 transitions. [2021-08-26 09:01:49,349 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-08-26 09:01:49,349 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 09:01:49,349 INFO L512 BasicCegarLoop]: trace histogram [15, 15, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 09:01:49,367 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-08-26 09:01:49,556 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-08-26 09:01:49,557 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 09:01:49,557 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 09:01:49,557 INFO L82 PathProgramCache]: Analyzing trace with hash -1321174388, now seen corresponding path program 14 times [2021-08-26 09:01:49,557 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 09:01:49,557 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [971326791] [2021-08-26 09:01:49,557 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 09:01:49,558 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 09:01:49,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:49,605 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:49,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:49,662 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:49,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:49,689 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:49,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:49,714 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:49,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:49,744 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:49,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:49,770 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:49,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:49,794 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:49,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:49,817 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:49,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:49,846 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:49,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:49,871 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:49,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:49,893 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:49,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:49,914 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:49,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:49,943 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:49,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:49,964 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:49,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:49,984 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:49,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:50,006 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 301 trivial. 0 not checked. [2021-08-26 09:01:50,007 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 09:01:50,007 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [971326791] [2021-08-26 09:01:50,007 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [971326791] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:01:50,007 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1999682706] [2021-08-26 09:01:50,007 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-08-26 09:01:50,007 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 09:01:50,008 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-26 09:01:50,009 INFO L229 MonitoredProcess]: Starting monitored process 15 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-26 09:01:50,039 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-08-26 09:01:50,399 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-08-26 09:01:50,400 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-08-26 09:01:50,401 INFO L263 TraceCheckSpWp]: Trace formula consists of 310 conjuncts, 32 conjunts are in the unsatisfiable core [2021-08-26 09:01:50,403 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-26 09:01:50,729 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 301 trivial. 0 not checked. [2021-08-26 09:01:50,729 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1999682706] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:01:50,729 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-26 09:01:50,729 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 20 [2021-08-26 09:01:50,729 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [282002236] [2021-08-26 09:01:50,730 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-08-26 09:01:50,730 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 09:01:50,730 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-08-26 09:01:50,731 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=237, Unknown=0, NotChecked=0, Total=380 [2021-08-26 09:01:50,731 INFO L87 Difference]: Start difference. First operand 54 states and 55 transitions. Second operand has 20 states, 19 states have (on average 2.1052631578947367) internal successors, (40), 20 states have internal predecessors, (40), 3 states have call successors, (3), 1 states have call predecessors, (3), 15 states have return successors, (29), 15 states have call predecessors, (29), 3 states have call successors, (29) [2021-08-26 09:01:50,899 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 09:01:50,899 INFO L93 Difference]: Finished difference Result 61 states and 62 transitions. [2021-08-26 09:01:50,899 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-08-26 09:01:50,900 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 19 states have (on average 2.1052631578947367) internal successors, (40), 20 states have internal predecessors, (40), 3 states have call successors, (3), 1 states have call predecessors, (3), 15 states have return successors, (29), 15 states have call predecessors, (29), 3 states have call successors, (29) Word has length 94 [2021-08-26 09:01:50,900 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 09:01:50,900 INFO L225 Difference]: With dead ends: 61 [2021-08-26 09:01:50,900 INFO L226 Difference]: Without dead ends: 57 [2021-08-26 09:01:50,901 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 123 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 210 ImplicationChecksByTransitivity, 261.0ms TimeCoverageRelationStatistics Valid=428, Invalid=762, Unknown=0, NotChecked=0, Total=1190 [2021-08-26 09:01:50,901 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-08-26 09:01:50,904 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2021-08-26 09:01:50,904 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 38 states have (on average 1.0263157894736843) internal successors, (39), 39 states have internal predecessors, (39), 2 states have call successors, (2), 1 states have call predecessors, (2), 16 states have return successors, (17), 16 states have call predecessors, (17), 2 states have call successors, (17) [2021-08-26 09:01:50,904 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 58 transitions. [2021-08-26 09:01:50,904 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 58 transitions. Word has length 94 [2021-08-26 09:01:50,905 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 09:01:50,905 INFO L470 AbstractCegarLoop]: Abstraction has 57 states and 58 transitions. [2021-08-26 09:01:50,905 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 19 states have (on average 2.1052631578947367) internal successors, (40), 20 states have internal predecessors, (40), 3 states have call successors, (3), 1 states have call predecessors, (3), 15 states have return successors, (29), 15 states have call predecessors, (29), 3 states have call successors, (29) [2021-08-26 09:01:50,905 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 58 transitions. [2021-08-26 09:01:50,906 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2021-08-26 09:01:50,906 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 09:01:50,906 INFO L512 BasicCegarLoop]: trace histogram [16, 16, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 09:01:50,925 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-08-26 09:01:51,116 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 09:01:51,117 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 09:01:51,117 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 09:01:51,117 INFO L82 PathProgramCache]: Analyzing trace with hash 415287702, now seen corresponding path program 15 times [2021-08-26 09:01:51,117 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 09:01:51,117 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2064824714] [2021-08-26 09:01:51,117 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 09:01:51,117 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 09:01:51,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:51,162 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:51,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:51,195 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:51,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:51,225 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:51,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:51,257 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:51,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:51,286 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:51,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:51,312 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:51,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:51,337 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:51,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:51,361 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:51,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:51,396 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:51,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:51,419 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:51,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:51,442 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:51,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:51,465 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:51,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:51,489 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:51,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:51,515 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:51,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:51,537 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:51,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:51,559 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:51,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:51,593 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2021-08-26 09:01:51,593 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 09:01:51,593 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2064824714] [2021-08-26 09:01:51,593 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2064824714] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:01:51,594 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1057590466] [2021-08-26 09:01:51,594 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-08-26 09:01:51,594 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 09:01:51,594 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-26 09:01:51,595 INFO L229 MonitoredProcess]: Starting monitored process 16 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-26 09:01:51,629 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-08-26 09:01:52,024 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2021-08-26 09:01:52,024 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-08-26 09:01:52,026 INFO L263 TraceCheckSpWp]: Trace formula consists of 328 conjuncts, 34 conjunts are in the unsatisfiable core [2021-08-26 09:01:52,029 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-26 09:01:52,355 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2021-08-26 09:01:52,355 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1057590466] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:01:52,355 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-26 09:01:52,355 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 21 [2021-08-26 09:01:52,355 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1410733664] [2021-08-26 09:01:52,356 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-08-26 09:01:52,356 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 09:01:52,356 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-08-26 09:01:52,356 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=160, Invalid=260, Unknown=0, NotChecked=0, Total=420 [2021-08-26 09:01:52,357 INFO L87 Difference]: Start difference. First operand 57 states and 58 transitions. Second operand has 21 states, 20 states have (on average 2.1) internal successors, (42), 21 states have internal predecessors, (42), 3 states have call successors, (3), 1 states have call predecessors, (3), 16 states have return successors, (31), 16 states have call predecessors, (31), 3 states have call successors, (31) [2021-08-26 09:01:52,565 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 09:01:52,565 INFO L93 Difference]: Finished difference Result 64 states and 65 transitions. [2021-08-26 09:01:52,566 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-08-26 09:01:52,566 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 2.1) internal successors, (42), 21 states have internal predecessors, (42), 3 states have call successors, (3), 1 states have call predecessors, (3), 16 states have return successors, (31), 16 states have call predecessors, (31), 3 states have call successors, (31) Word has length 100 [2021-08-26 09:01:52,566 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 09:01:52,566 INFO L225 Difference]: With dead ends: 64 [2021-08-26 09:01:52,566 INFO L226 Difference]: Without dead ends: 60 [2021-08-26 09:01:52,567 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 131 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 240 ImplicationChecksByTransitivity, 301.7ms TimeCoverageRelationStatistics Valid=480, Invalid=852, Unknown=0, NotChecked=0, Total=1332 [2021-08-26 09:01:52,567 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-08-26 09:01:52,570 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2021-08-26 09:01:52,570 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 40 states have (on average 1.025) internal successors, (41), 41 states have internal predecessors, (41), 2 states have call successors, (2), 1 states have call predecessors, (2), 17 states have return successors, (18), 17 states have call predecessors, (18), 2 states have call successors, (18) [2021-08-26 09:01:52,570 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 61 transitions. [2021-08-26 09:01:52,570 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 61 transitions. Word has length 100 [2021-08-26 09:01:52,571 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 09:01:52,571 INFO L470 AbstractCegarLoop]: Abstraction has 60 states and 61 transitions. [2021-08-26 09:01:52,571 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 20 states have (on average 2.1) internal successors, (42), 21 states have internal predecessors, (42), 3 states have call successors, (3), 1 states have call predecessors, (3), 16 states have return successors, (31), 16 states have call predecessors, (31), 3 states have call successors, (31) [2021-08-26 09:01:52,571 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 61 transitions. [2021-08-26 09:01:52,572 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2021-08-26 09:01:52,572 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 09:01:52,572 INFO L512 BasicCegarLoop]: trace histogram [17, 17, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 09:01:52,611 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-08-26 09:01:52,796 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-08-26 09:01:52,797 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 09:01:52,797 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 09:01:52,797 INFO L82 PathProgramCache]: Analyzing trace with hash 317812044, now seen corresponding path program 16 times [2021-08-26 09:01:52,797 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 09:01:52,797 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1618983258] [2021-08-26 09:01:52,797 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 09:01:52,797 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 09:01:52,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:52,835 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:52,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:52,869 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:52,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:52,911 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:52,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:52,942 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:52,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:52,970 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:52,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:53,003 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:53,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:53,030 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:53,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:53,056 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:53,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:53,081 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:53,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:53,106 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:53,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:53,131 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:53,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:53,155 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:53,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:53,177 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:53,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:53,202 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:53,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:53,224 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:53,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:53,247 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:53,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:53,279 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:53,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:53,301 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2021-08-26 09:01:53,302 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 09:01:53,302 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1618983258] [2021-08-26 09:01:53,302 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1618983258] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:01:53,302 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1575767416] [2021-08-26 09:01:53,302 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-08-26 09:01:53,302 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 09:01:53,303 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-26 09:01:53,305 INFO L229 MonitoredProcess]: Starting monitored process 17 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-26 09:01:53,316 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-08-26 09:01:53,734 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-08-26 09:01:53,734 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-08-26 09:01:53,736 INFO L263 TraceCheckSpWp]: Trace formula consists of 346 conjuncts, 36 conjunts are in the unsatisfiable core [2021-08-26 09:01:53,737 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-26 09:01:54,094 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2021-08-26 09:01:54,095 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1575767416] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:01:54,095 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-26 09:01:54,095 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21] total 22 [2021-08-26 09:01:54,095 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [608823424] [2021-08-26 09:01:54,096 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-08-26 09:01:54,096 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 09:01:54,096 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-08-26 09:01:54,096 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=178, Invalid=284, Unknown=0, NotChecked=0, Total=462 [2021-08-26 09:01:54,097 INFO L87 Difference]: Start difference. First operand 60 states and 61 transitions. Second operand has 22 states, 21 states have (on average 2.0952380952380953) internal successors, (44), 22 states have internal predecessors, (44), 3 states have call successors, (3), 1 states have call predecessors, (3), 17 states have return successors, (33), 17 states have call predecessors, (33), 3 states have call successors, (33) [2021-08-26 09:01:54,299 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 09:01:54,299 INFO L93 Difference]: Finished difference Result 67 states and 68 transitions. [2021-08-26 09:01:54,300 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-08-26 09:01:54,300 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 2.0952380952380953) internal successors, (44), 22 states have internal predecessors, (44), 3 states have call successors, (3), 1 states have call predecessors, (3), 17 states have return successors, (33), 17 states have call predecessors, (33), 3 states have call successors, (33) Word has length 106 [2021-08-26 09:01:54,300 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 09:01:54,301 INFO L225 Difference]: With dead ends: 67 [2021-08-26 09:01:54,301 INFO L226 Difference]: Without dead ends: 63 [2021-08-26 09:01:54,302 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 139 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 272 ImplicationChecksByTransitivity, 317.9ms TimeCoverageRelationStatistics Valid=535, Invalid=947, Unknown=0, NotChecked=0, Total=1482 [2021-08-26 09:01:54,302 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-08-26 09:01:54,304 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2021-08-26 09:01:54,304 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 42 states have (on average 1.0238095238095237) internal successors, (43), 43 states have internal predecessors, (43), 2 states have call successors, (2), 1 states have call predecessors, (2), 18 states have return successors, (19), 18 states have call predecessors, (19), 2 states have call successors, (19) [2021-08-26 09:01:54,305 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 64 transitions. [2021-08-26 09:01:54,305 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 64 transitions. Word has length 106 [2021-08-26 09:01:54,308 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 09:01:54,308 INFO L470 AbstractCegarLoop]: Abstraction has 63 states and 64 transitions. [2021-08-26 09:01:54,308 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 21 states have (on average 2.0952380952380953) internal successors, (44), 22 states have internal predecessors, (44), 3 states have call successors, (3), 1 states have call predecessors, (3), 17 states have return successors, (33), 17 states have call predecessors, (33), 3 states have call successors, (33) [2021-08-26 09:01:54,309 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 64 transitions. [2021-08-26 09:01:54,310 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-08-26 09:01:54,310 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 09:01:54,310 INFO L512 BasicCegarLoop]: trace histogram [18, 18, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 09:01:54,328 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-08-26 09:01:54,521 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-08-26 09:01:54,521 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 09:01:54,522 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 09:01:54,522 INFO L82 PathProgramCache]: Analyzing trace with hash -2122437418, now seen corresponding path program 17 times [2021-08-26 09:01:54,522 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 09:01:54,522 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1901574997] [2021-08-26 09:01:54,522 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 09:01:54,522 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 09:01:54,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:54,560 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:54,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:54,603 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:54,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:54,638 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:54,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:54,671 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:54,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:54,701 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:54,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:54,735 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:54,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:54,764 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:54,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:54,792 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:54,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:54,827 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:54,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:54,853 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:54,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:54,884 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:54,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:54,912 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:54,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:54,937 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:54,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:54,963 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:54,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:54,988 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:54,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:55,012 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:55,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:55,037 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:55,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:55,061 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:55,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:55,087 INFO L134 CoverageAnalysis]: Checked inductivity of 884 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2021-08-26 09:01:55,087 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 09:01:55,088 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1901574997] [2021-08-26 09:01:55,088 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1901574997] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:01:55,088 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1565877342] [2021-08-26 09:01:55,088 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-08-26 09:01:55,088 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 09:01:55,088 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-26 09:01:55,089 INFO L229 MonitoredProcess]: Starting monitored process 18 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-26 09:01:55,090 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-08-26 09:01:55,603 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2021-08-26 09:01:55,603 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-08-26 09:01:55,604 INFO L263 TraceCheckSpWp]: Trace formula consists of 364 conjuncts, 38 conjunts are in the unsatisfiable core [2021-08-26 09:01:55,606 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-26 09:01:56,009 INFO L134 CoverageAnalysis]: Checked inductivity of 884 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2021-08-26 09:01:56,010 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1565877342] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:01:56,010 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-26 09:01:56,010 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 23 [2021-08-26 09:01:56,010 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1836680840] [2021-08-26 09:01:56,011 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-08-26 09:01:56,011 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 09:01:56,011 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-08-26 09:01:56,011 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=197, Invalid=309, Unknown=0, NotChecked=0, Total=506 [2021-08-26 09:01:56,012 INFO L87 Difference]: Start difference. First operand 63 states and 64 transitions. Second operand has 23 states, 22 states have (on average 2.090909090909091) internal successors, (46), 23 states have internal predecessors, (46), 3 states have call successors, (3), 1 states have call predecessors, (3), 18 states have return successors, (35), 18 states have call predecessors, (35), 3 states have call successors, (35) [2021-08-26 09:01:56,229 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 09:01:56,230 INFO L93 Difference]: Finished difference Result 70 states and 71 transitions. [2021-08-26 09:01:56,237 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-08-26 09:01:56,237 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 22 states have (on average 2.090909090909091) internal successors, (46), 23 states have internal predecessors, (46), 3 states have call successors, (3), 1 states have call predecessors, (3), 18 states have return successors, (35), 18 states have call predecessors, (35), 3 states have call successors, (35) Word has length 112 [2021-08-26 09:01:56,237 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 09:01:56,238 INFO L225 Difference]: With dead ends: 70 [2021-08-26 09:01:56,238 INFO L226 Difference]: Without dead ends: 66 [2021-08-26 09:01:56,239 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 186 GetRequests, 147 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 306 ImplicationChecksByTransitivity, 360.0ms TimeCoverageRelationStatistics Valid=593, Invalid=1047, Unknown=0, NotChecked=0, Total=1640 [2021-08-26 09:01:56,239 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2021-08-26 09:01:56,241 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 66. [2021-08-26 09:01:56,242 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 44 states have (on average 1.0227272727272727) internal successors, (45), 45 states have internal predecessors, (45), 2 states have call successors, (2), 1 states have call predecessors, (2), 19 states have return successors, (20), 19 states have call predecessors, (20), 2 states have call successors, (20) [2021-08-26 09:01:56,242 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 67 transitions. [2021-08-26 09:01:56,242 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 67 transitions. Word has length 112 [2021-08-26 09:01:56,243 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 09:01:56,243 INFO L470 AbstractCegarLoop]: Abstraction has 66 states and 67 transitions. [2021-08-26 09:01:56,243 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 22 states have (on average 2.090909090909091) internal successors, (46), 23 states have internal predecessors, (46), 3 states have call successors, (3), 1 states have call predecessors, (3), 18 states have return successors, (35), 18 states have call predecessors, (35), 3 states have call successors, (35) [2021-08-26 09:01:56,243 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 67 transitions. [2021-08-26 09:01:56,244 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2021-08-26 09:01:56,244 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 09:01:56,244 INFO L512 BasicCegarLoop]: trace histogram [19, 19, 18, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 09:01:56,270 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-08-26 09:01:56,460 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-08-26 09:01:56,461 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 09:01:56,461 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 09:01:56,461 INFO L82 PathProgramCache]: Analyzing trace with hash 55840780, now seen corresponding path program 18 times [2021-08-26 09:01:56,461 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 09:01:56,461 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [493011433] [2021-08-26 09:01:56,461 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 09:01:56,461 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 09:01:56,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:56,500 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:56,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:56,536 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:56,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:56,580 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:56,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:56,612 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:56,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:56,643 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:56,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:56,676 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:56,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:56,708 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:56,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:56,738 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:56,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:56,765 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:56,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:56,792 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:56,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:56,817 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:56,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:56,843 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:56,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:56,871 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:56,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:56,895 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:56,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:56,925 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:56,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:56,951 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:56,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:56,974 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:56,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:56,998 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:57,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:57,021 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:57,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:57,046 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 495 trivial. 0 not checked. [2021-08-26 09:01:57,047 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 09:01:57,047 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [493011433] [2021-08-26 09:01:57,047 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [493011433] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:01:57,047 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [152930933] [2021-08-26 09:01:57,047 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-08-26 09:01:57,048 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 09:01:57,048 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-26 09:01:57,049 INFO L229 MonitoredProcess]: Starting monitored process 19 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-26 09:01:57,050 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-08-26 09:01:57,614 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 19 check-sat command(s) [2021-08-26 09:01:57,614 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-08-26 09:01:57,616 INFO L263 TraceCheckSpWp]: Trace formula consists of 382 conjuncts, 40 conjunts are in the unsatisfiable core [2021-08-26 09:01:57,618 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-26 09:01:57,974 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 495 trivial. 0 not checked. [2021-08-26 09:01:57,975 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [152930933] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:01:57,975 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-26 09:01:57,975 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23] total 24 [2021-08-26 09:01:57,975 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [958028120] [2021-08-26 09:01:57,976 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-08-26 09:01:57,976 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 09:01:57,976 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-08-26 09:01:57,976 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=217, Invalid=335, Unknown=0, NotChecked=0, Total=552 [2021-08-26 09:01:57,977 INFO L87 Difference]: Start difference. First operand 66 states and 67 transitions. Second operand has 24 states, 23 states have (on average 2.0869565217391304) internal successors, (48), 24 states have internal predecessors, (48), 3 states have call successors, (3), 1 states have call predecessors, (3), 19 states have return successors, (37), 19 states have call predecessors, (37), 3 states have call successors, (37) [2021-08-26 09:01:58,197 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 09:01:58,197 INFO L93 Difference]: Finished difference Result 73 states and 74 transitions. [2021-08-26 09:01:58,198 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-08-26 09:01:58,198 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 2.0869565217391304) internal successors, (48), 24 states have internal predecessors, (48), 3 states have call successors, (3), 1 states have call predecessors, (3), 19 states have return successors, (37), 19 states have call predecessors, (37), 3 states have call successors, (37) Word has length 118 [2021-08-26 09:01:58,198 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 09:01:58,199 INFO L225 Difference]: With dead ends: 73 [2021-08-26 09:01:58,199 INFO L226 Difference]: Without dead ends: 69 [2021-08-26 09:01:58,200 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 155 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 342 ImplicationChecksByTransitivity, 379.7ms TimeCoverageRelationStatistics Valid=654, Invalid=1152, Unknown=0, NotChecked=0, Total=1806 [2021-08-26 09:01:58,200 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2021-08-26 09:01:58,202 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2021-08-26 09:01:58,202 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 46 states have (on average 1.0217391304347827) internal successors, (47), 47 states have internal predecessors, (47), 2 states have call successors, (2), 1 states have call predecessors, (2), 20 states have return successors, (21), 20 states have call predecessors, (21), 2 states have call successors, (21) [2021-08-26 09:01:58,203 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 70 transitions. [2021-08-26 09:01:58,203 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 70 transitions. Word has length 118 [2021-08-26 09:01:58,203 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 09:01:58,203 INFO L470 AbstractCegarLoop]: Abstraction has 69 states and 70 transitions. [2021-08-26 09:01:58,204 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 23 states have (on average 2.0869565217391304) internal successors, (48), 24 states have internal predecessors, (48), 3 states have call successors, (3), 1 states have call predecessors, (3), 19 states have return successors, (37), 19 states have call predecessors, (37), 3 states have call successors, (37) [2021-08-26 09:01:58,204 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 70 transitions. [2021-08-26 09:01:58,204 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2021-08-26 09:01:58,204 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 09:01:58,205 INFO L512 BasicCegarLoop]: trace histogram [20, 20, 19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 09:01:58,226 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-08-26 09:01:58,405 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,19 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 09:01:58,405 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 09:01:58,406 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 09:01:58,406 INFO L82 PathProgramCache]: Analyzing trace with hash -806952938, now seen corresponding path program 19 times [2021-08-26 09:01:58,406 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 09:01:58,406 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [161523185] [2021-08-26 09:01:58,406 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 09:01:58,406 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 09:01:58,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:58,443 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:58,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:58,480 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:58,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:58,517 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:58,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:58,551 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:58,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:58,583 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:58,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:58,629 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:58,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:58,659 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:58,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:58,687 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:58,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:58,714 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:58,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:58,741 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:58,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:58,767 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:58,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:58,793 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:58,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:58,818 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:58,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:58,844 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:58,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:58,869 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:58,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:58,893 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:58,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:58,920 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:58,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:58,946 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:58,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:58,970 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:58,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:58,995 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:58,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:59,023 INFO L134 CoverageAnalysis]: Checked inductivity of 1102 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 551 trivial. 0 not checked. [2021-08-26 09:01:59,023 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 09:01:59,024 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [161523185] [2021-08-26 09:01:59,024 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [161523185] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:01:59,024 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1519704595] [2021-08-26 09:01:59,024 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-08-26 09:01:59,024 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 09:01:59,024 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-26 09:01:59,025 INFO L229 MonitoredProcess]: Starting monitored process 20 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-26 09:01:59,049 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-08-26 09:01:59,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:59,598 INFO L263 TraceCheckSpWp]: Trace formula consists of 400 conjuncts, 42 conjunts are in the unsatisfiable core [2021-08-26 09:01:59,599 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-26 09:01:59,995 INFO L134 CoverageAnalysis]: Checked inductivity of 1102 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 551 trivial. 0 not checked. [2021-08-26 09:01:59,995 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1519704595] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:01:59,996 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-26 09:01:59,996 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24] total 25 [2021-08-26 09:01:59,996 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [390725672] [2021-08-26 09:01:59,996 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-08-26 09:01:59,996 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 09:01:59,996 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-08-26 09:01:59,997 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=238, Invalid=362, Unknown=0, NotChecked=0, Total=600 [2021-08-26 09:01:59,997 INFO L87 Difference]: Start difference. First operand 69 states and 70 transitions. Second operand has 25 states, 24 states have (on average 2.0833333333333335) internal successors, (50), 25 states have internal predecessors, (50), 3 states have call successors, (3), 1 states have call predecessors, (3), 20 states have return successors, (39), 20 states have call predecessors, (39), 3 states have call successors, (39) [2021-08-26 09:02:00,235 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 09:02:00,235 INFO L93 Difference]: Finished difference Result 76 states and 77 transitions. [2021-08-26 09:02:00,236 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-08-26 09:02:00,236 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 24 states have (on average 2.0833333333333335) internal successors, (50), 25 states have internal predecessors, (50), 3 states have call successors, (3), 1 states have call predecessors, (3), 20 states have return successors, (39), 20 states have call predecessors, (39), 3 states have call successors, (39) Word has length 124 [2021-08-26 09:02:00,236 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 09:02:00,237 INFO L225 Difference]: With dead ends: 76 [2021-08-26 09:02:00,237 INFO L226 Difference]: Without dead ends: 72 [2021-08-26 09:02:00,237 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 206 GetRequests, 163 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 380 ImplicationChecksByTransitivity, 415.6ms TimeCoverageRelationStatistics Valid=718, Invalid=1262, Unknown=0, NotChecked=0, Total=1980 [2021-08-26 09:02:00,238 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2021-08-26 09:02:00,240 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 72. [2021-08-26 09:02:00,240 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 48 states have (on average 1.0208333333333333) internal successors, (49), 49 states have internal predecessors, (49), 2 states have call successors, (2), 1 states have call predecessors, (2), 21 states have return successors, (22), 21 states have call predecessors, (22), 2 states have call successors, (22) [2021-08-26 09:02:00,240 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 73 transitions. [2021-08-26 09:02:00,240 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 73 transitions. Word has length 124 [2021-08-26 09:02:00,241 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 09:02:00,241 INFO L470 AbstractCegarLoop]: Abstraction has 72 states and 73 transitions. [2021-08-26 09:02:00,241 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 24 states have (on average 2.0833333333333335) internal successors, (50), 25 states have internal predecessors, (50), 3 states have call successors, (3), 1 states have call predecessors, (3), 20 states have return successors, (39), 20 states have call predecessors, (39), 3 states have call successors, (39) [2021-08-26 09:02:00,241 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 73 transitions. [2021-08-26 09:02:00,242 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2021-08-26 09:02:00,242 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 09:02:00,242 INFO L512 BasicCegarLoop]: trace histogram [21, 21, 20, 20, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 09:02:00,266 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-08-26 09:02:00,448 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,20 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 09:02:00,449 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 09:02:00,450 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 09:02:00,450 INFO L82 PathProgramCache]: Analyzing trace with hash -1807457588, now seen corresponding path program 20 times [2021-08-26 09:02:00,450 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 09:02:00,450 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2131955247] [2021-08-26 09:02:00,450 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 09:02:00,450 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 09:02:00,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-08-26 09:02:00,478 INFO L354 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-08-26 09:02:00,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-08-26 09:02:00,540 INFO L133 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-08-26 09:02:00,540 INFO L626 BasicCegarLoop]: Counterexample is feasible [2021-08-26 09:02:00,542 INFO L764 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION [2021-08-26 09:02:00,544 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2021-08-26 09:02:00,554 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2021-08-26 09:02:00,635 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 26.08 09:02:00 BoogieIcfgContainer [2021-08-26 09:02:00,635 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-08-26 09:02:00,635 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-08-26 09:02:00,635 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-08-26 09:02:00,636 INFO L275 PluginConnector]: Witness Printer initialized [2021-08-26 09:02:00,636 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.08 09:01:34" (3/4) ... [2021-08-26 09:02:00,638 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2021-08-26 09:02:00,708 INFO L141 WitnessManager]: Wrote witness to /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/witness.graphml [2021-08-26 09:02:00,708 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-08-26 09:02:00,710 INFO L168 Benchmark]: Toolchain (without parser) took 26337.58 ms. Allocated memory was 50.3 MB in the beginning and 394.3 MB in the end (delta: 343.9 MB). Free memory was 27.8 MB in the beginning and 246.9 MB in the end (delta: -219.1 MB). Peak memory consumption was 124.9 MB. Max. memory is 16.1 GB. [2021-08-26 09:02:00,710 INFO L168 Benchmark]: CDTParser took 0.16 ms. Allocated memory is still 50.3 MB. Free memory was 32.3 MB in the beginning and 32.3 MB in the end (delta: 37.6 kB). There was no memory consumed. Max. memory is 16.1 GB. [2021-08-26 09:02:00,710 INFO L168 Benchmark]: CACSL2BoogieTranslator took 191.39 ms. Allocated memory is still 50.3 MB. Free memory was 27.6 MB in the beginning and 30.0 MB in the end (delta: -2.3 MB). Peak memory consumption was 7.3 MB. Max. memory is 16.1 GB. [2021-08-26 09:02:00,711 INFO L168 Benchmark]: Boogie Procedure Inliner took 24.25 ms. Allocated memory is still 50.3 MB. Free memory was 30.0 MB in the beginning and 28.6 MB in the end (delta: 1.3 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-08-26 09:02:00,711 INFO L168 Benchmark]: Boogie Preprocessor took 17.73 ms. Allocated memory is still 50.3 MB. Free memory was 28.6 MB in the beginning and 27.7 MB in the end (delta: 947.5 kB). There was no memory consumed. Max. memory is 16.1 GB. [2021-08-26 09:02:00,711 INFO L168 Benchmark]: RCFGBuilder took 314.43 ms. Allocated memory was 50.3 MB in the beginning and 60.8 MB in the end (delta: 10.5 MB). Free memory was 27.7 MB in the beginning and 38.1 MB in the end (delta: -10.5 MB). Peak memory consumption was 7.4 MB. Max. memory is 16.1 GB. [2021-08-26 09:02:00,712 INFO L168 Benchmark]: TraceAbstraction took 25710.81 ms. Allocated memory was 60.8 MB in the beginning and 394.3 MB in the end (delta: 333.4 MB). Free memory was 37.7 MB in the beginning and 253.2 MB in the end (delta: -215.5 MB). Peak memory consumption was 118.6 MB. Max. memory is 16.1 GB. [2021-08-26 09:02:00,712 INFO L168 Benchmark]: Witness Printer took 72.98 ms. Allocated memory is still 394.3 MB. Free memory was 253.2 MB in the beginning and 246.9 MB in the end (delta: 6.3 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. [2021-08-26 09:02:00,713 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.16 ms. Allocated memory is still 50.3 MB. Free memory was 32.3 MB in the beginning and 32.3 MB in the end (delta: 37.6 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 191.39 ms. Allocated memory is still 50.3 MB. Free memory was 27.6 MB in the beginning and 30.0 MB in the end (delta: -2.3 MB). Peak memory consumption was 7.3 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 24.25 ms. Allocated memory is still 50.3 MB. Free memory was 30.0 MB in the beginning and 28.6 MB in the end (delta: 1.3 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 17.73 ms. Allocated memory is still 50.3 MB. Free memory was 28.6 MB in the beginning and 27.7 MB in the end (delta: 947.5 kB). There was no memory consumed. Max. memory is 16.1 GB. * RCFGBuilder took 314.43 ms. Allocated memory was 50.3 MB in the beginning and 60.8 MB in the end (delta: 10.5 MB). Free memory was 27.7 MB in the beginning and 38.1 MB in the end (delta: -10.5 MB). Peak memory consumption was 7.4 MB. Max. memory is 16.1 GB. * TraceAbstraction took 25710.81 ms. Allocated memory was 60.8 MB in the beginning and 394.3 MB in the end (delta: 333.4 MB). Free memory was 37.7 MB in the beginning and 253.2 MB in the end (delta: -215.5 MB). Peak memory consumption was 118.6 MB. Max. memory is 16.1 GB. * Witness Printer took 72.98 ms. Allocated memory is still 394.3 MB. Free memory was 253.2 MB in the beginning and 246.9 MB in the end (delta: 6.3 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0ms ErrorAutomatonConstructionTimeTotal, 0.0ms FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0ms ErrorAutomatonConstructionTimeAvg, 0.0ms ErrorAutomatonDifferenceTimeAvg, 0.0ms ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - CounterExampleResult [Line: 18]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L14] int a = 20; [L15] int b = 0; [L16] CALL, EXPR sum(a, b) VAL [\old(m)=0, \old(n)=20] [L6] COND FALSE !(n <= 0) VAL [\old(m)=0, \old(n)=20, m=0, n=20] [L9] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=1, \old(n)=19] [L6] COND FALSE !(n <= 0) VAL [\old(m)=1, \old(n)=19, m=1, n=19] [L9] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=2, \old(n)=18] [L6] COND FALSE !(n <= 0) VAL [\old(m)=2, \old(n)=18, m=2, n=18] [L9] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=3, \old(n)=17] [L6] COND FALSE !(n <= 0) VAL [\old(m)=3, \old(n)=17, m=3, n=17] [L9] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=4, \old(n)=16] [L6] COND FALSE !(n <= 0) VAL [\old(m)=4, \old(n)=16, m=4, n=16] [L9] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=5, \old(n)=15] [L6] COND FALSE !(n <= 0) VAL [\old(m)=5, \old(n)=15, m=5, n=15] [L9] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=6, \old(n)=14] [L6] COND FALSE !(n <= 0) VAL [\old(m)=6, \old(n)=14, m=6, n=14] [L9] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=7, \old(n)=13] [L6] COND FALSE !(n <= 0) VAL [\old(m)=7, \old(n)=13, m=7, n=13] [L9] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=8, \old(n)=12] [L6] COND FALSE !(n <= 0) VAL [\old(m)=8, \old(n)=12, m=8, n=12] [L9] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=9, \old(n)=11] [L6] COND FALSE !(n <= 0) VAL [\old(m)=9, \old(n)=11, m=9, n=11] [L9] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=10, \old(n)=10] [L6] COND FALSE !(n <= 0) VAL [\old(m)=10, \old(n)=10, m=10, n=10] [L9] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=11, \old(n)=9] [L6] COND FALSE !(n <= 0) VAL [\old(m)=11, \old(n)=9, m=11, n=9] [L9] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=12, \old(n)=8] [L6] COND FALSE !(n <= 0) VAL [\old(m)=12, \old(n)=8, m=12, n=8] [L9] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=13, \old(n)=7] [L6] COND FALSE !(n <= 0) VAL [\old(m)=13, \old(n)=7, m=13, n=7] [L9] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=14, \old(n)=6] [L6] COND FALSE !(n <= 0) VAL [\old(m)=14, \old(n)=6, m=14, n=6] [L9] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=15, \old(n)=5] [L6] COND FALSE !(n <= 0) VAL [\old(m)=15, \old(n)=5, m=15, n=5] [L9] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=16, \old(n)=4] [L6] COND FALSE !(n <= 0) VAL [\old(m)=16, \old(n)=4, m=16, n=4] [L9] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=17, \old(n)=3] [L6] COND FALSE !(n <= 0) VAL [\old(m)=17, \old(n)=3, m=17, n=3] [L9] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=18, \old(n)=2] [L6] COND FALSE !(n <= 0) VAL [\old(m)=18, \old(n)=2, m=18, n=2] [L9] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=19, \old(n)=1] [L6] COND FALSE !(n <= 0) VAL [\old(m)=19, \old(n)=1, m=19, n=1] [L9] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=20, \old(n)=0] [L6] COND TRUE n <= 0 [L7] return m + n; VAL [\old(m)=20, \old(n)=0, \result=20, m=20, n=0] [L9] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=19, \old(n)=1, m=19, n=1, sum(n - 1, m + 1)=20] [L9] return sum(n - 1, m + 1); [L9] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=18, \old(n)=2, m=18, n=2, sum(n - 1, m + 1)=20] [L9] return sum(n - 1, m + 1); [L9] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=17, \old(n)=3, m=17, n=3, sum(n - 1, m + 1)=20] [L9] return sum(n - 1, m + 1); [L9] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=16, \old(n)=4, m=16, n=4, sum(n - 1, m + 1)=20] [L9] return sum(n - 1, m + 1); [L9] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=15, \old(n)=5, m=15, n=5, sum(n - 1, m + 1)=20] [L9] return sum(n - 1, m + 1); [L9] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=14, \old(n)=6, m=14, n=6, sum(n - 1, m + 1)=20] [L9] return sum(n - 1, m + 1); [L9] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=13, \old(n)=7, m=13, n=7, sum(n - 1, m + 1)=20] [L9] return sum(n - 1, m + 1); [L9] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=12, \old(n)=8, m=12, n=8, sum(n - 1, m + 1)=20] [L9] return sum(n - 1, m + 1); [L9] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=11, \old(n)=9, m=11, n=9, sum(n - 1, m + 1)=20] [L9] return sum(n - 1, m + 1); [L9] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=10, \old(n)=10, m=10, n=10, sum(n - 1, m + 1)=20] [L9] return sum(n - 1, m + 1); [L9] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=9, \old(n)=11, m=9, n=11, sum(n - 1, m + 1)=20] [L9] return sum(n - 1, m + 1); [L9] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=8, \old(n)=12, m=8, n=12, sum(n - 1, m + 1)=20] [L9] return sum(n - 1, m + 1); [L9] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=7, \old(n)=13, m=7, n=13, sum(n - 1, m + 1)=20] [L9] return sum(n - 1, m + 1); [L9] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=6, \old(n)=14, m=6, n=14, sum(n - 1, m + 1)=20] [L9] return sum(n - 1, m + 1); [L9] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=5, \old(n)=15, m=5, n=15, sum(n - 1, m + 1)=20] [L9] return sum(n - 1, m + 1); [L9] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=4, \old(n)=16, m=4, n=16, sum(n - 1, m + 1)=20] [L9] return sum(n - 1, m + 1); [L9] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=3, \old(n)=17, m=3, n=17, sum(n - 1, m + 1)=20] [L9] return sum(n - 1, m + 1); [L9] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=2, \old(n)=18, m=2, n=18, sum(n - 1, m + 1)=20] [L9] return sum(n - 1, m + 1); [L9] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=1, \old(n)=19, m=1, n=19, sum(n - 1, m + 1)=20] [L9] return sum(n - 1, m + 1); [L9] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=0, \old(n)=20, m=0, n=20, sum(n - 1, m + 1)=20] [L9] return sum(n - 1, m + 1); [L16] RET, EXPR sum(a, b) [L16] int result = sum(a, b); [L17] COND TRUE result == a + b [L18] reach_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 2 procedures, 16 locations, 1 error locations. Started 1 CEGAR loops. OverallTime: 25543.5ms, OverallIterations: 21, TraceHistogramMax: 21, EmptinessCheckTime: 23.7ms, AutomataDifference: 3503.7ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 8.3ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 179 SDtfs, 842 SDslu, 987 SDs, 0 SdLazy, 1120 SolverSat, 290 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 891.6ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 2232 GetRequests, 1687 SyntacticMatches, 0 SemanticMatches, 545 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3494 ImplicationChecksByTransitivity, 4980.4ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=72occurred in iteration=20, InterpolantAutomatonStates: 308, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 112.0ms AutomataMinimizationTime, 20 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 228.5ms SsaConstructionTime, 860.3ms SatisfiabilityAnalysisTime, 11956.8ms InterpolantComputationTime, 2800 NumberOfCodeBlocks, 2800 NumberOfCodeBlocksAsserted, 142 NumberOfCheckSat, 2631 ConstructedInterpolants, 0 QuantifiedInterpolants, 6899 SizeOfPredicates, 221 NumberOfNonLiveVariables, 4522 ConjunctsInSsa, 504 ConjunctsInUnsatCore, 39 InterpolantComputations, 1 PerfectInterpolantSequences, 7600/15200 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! [2021-08-26 09:02:00,754 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 0 Received shutdown request...