./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/recursive-simple/id_o20.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version ff03de63 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/id_o20.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 78daae7f2fbb1fbd12685beb952877b8686cc8bc3d2c7fcd55d0c5d2b019aa0d --- Real Ultimate output --- This is Ultimate 0.2.2-dev-ff03de6 [2021-12-21 13:20:04,686 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-12-21 13:20:04,696 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-12-21 13:20:04,743 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-12-21 13:20:04,744 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-12-21 13:20:04,747 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-12-21 13:20:04,749 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-12-21 13:20:04,751 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-12-21 13:20:04,753 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-12-21 13:20:04,756 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-12-21 13:20:04,756 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-12-21 13:20:04,757 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-12-21 13:20:04,758 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-12-21 13:20:04,759 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-12-21 13:20:04,760 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-12-21 13:20:04,761 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-12-21 13:20:04,762 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-12-21 13:20:04,763 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-12-21 13:20:04,766 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-12-21 13:20:04,770 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-12-21 13:20:04,771 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-12-21 13:20:04,771 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-12-21 13:20:04,772 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-12-21 13:20:04,773 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-12-21 13:20:04,777 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-12-21 13:20:04,778 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-12-21 13:20:04,778 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-12-21 13:20:04,779 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-12-21 13:20:04,779 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-12-21 13:20:04,780 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-12-21 13:20:04,780 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-12-21 13:20:04,780 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-12-21 13:20:04,781 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-12-21 13:20:04,782 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-12-21 13:20:04,783 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-12-21 13:20:04,783 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-12-21 13:20:04,783 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-12-21 13:20:04,784 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-12-21 13:20:04,784 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-12-21 13:20:04,784 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-12-21 13:20:04,785 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-12-21 13:20:04,786 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2021-12-21 13:20:04,809 INFO L113 SettingsManager]: Loading preferences was successful [2021-12-21 13:20:04,809 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-12-21 13:20:04,810 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-12-21 13:20:04,810 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-12-21 13:20:04,811 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-12-21 13:20:04,811 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-12-21 13:20:04,811 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-12-21 13:20:04,811 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-12-21 13:20:04,811 INFO L138 SettingsManager]: * Use SBE=true [2021-12-21 13:20:04,812 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-12-21 13:20:04,812 INFO L138 SettingsManager]: * sizeof long=4 [2021-12-21 13:20:04,812 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-12-21 13:20:04,813 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-12-21 13:20:04,813 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-12-21 13:20:04,813 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-12-21 13:20:04,813 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-12-21 13:20:04,813 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-12-21 13:20:04,813 INFO L138 SettingsManager]: * sizeof long double=12 [2021-12-21 13:20:04,813 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-12-21 13:20:04,814 INFO L138 SettingsManager]: * Use constant arrays=true [2021-12-21 13:20:04,814 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-12-21 13:20:04,814 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-12-21 13:20:04,814 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-12-21 13:20:04,814 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-12-21 13:20:04,814 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-21 13:20:04,814 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-12-21 13:20:04,815 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-12-21 13:20:04,815 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-12-21 13:20:04,815 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-12-21 13:20:04,815 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-12-21 13:20:04,815 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-12-21 13:20:04,815 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-12-21 13:20:04,815 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-12-21 13:20:04,816 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-12-21 13:20:04,816 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 78daae7f2fbb1fbd12685beb952877b8686cc8bc3d2c7fcd55d0c5d2b019aa0d [2021-12-21 13:20:05,024 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-12-21 13:20:05,040 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-12-21 13:20:05,042 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-12-21 13:20:05,043 INFO L271 PluginConnector]: Initializing CDTParser... [2021-12-21 13:20:05,043 INFO L275 PluginConnector]: CDTParser initialized [2021-12-21 13:20:05,044 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/recursive-simple/id_o20.c [2021-12-21 13:20:05,096 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/178ee1786/366e81e0efae483cbdcbc2e4e28b7a0c/FLAG90c9c968a [2021-12-21 13:20:05,440 INFO L306 CDTParser]: Found 1 translation units. [2021-12-21 13:20:05,441 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/recursive-simple/id_o20.c [2021-12-21 13:20:05,448 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/178ee1786/366e81e0efae483cbdcbc2e4e28b7a0c/FLAG90c9c968a [2021-12-21 13:20:05,459 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/178ee1786/366e81e0efae483cbdcbc2e4e28b7a0c [2021-12-21 13:20:05,461 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-12-21 13:20:05,462 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-12-21 13:20:05,465 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-12-21 13:20:05,465 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-12-21 13:20:05,468 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-12-21 13:20:05,468 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.12 01:20:05" (1/1) ... [2021-12-21 13:20:05,469 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@c0a201c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 01:20:05, skipping insertion in model container [2021-12-21 13:20:05,469 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.12 01:20:05" (1/1) ... [2021-12-21 13:20:05,473 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-12-21 13:20:05,484 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-12-21 13:20:05,596 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/recursive-simple/id_o20.c[516,529] [2021-12-21 13:20:05,599 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-21 13:20:05,610 INFO L203 MainTranslator]: Completed pre-run [2021-12-21 13:20:05,619 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/recursive-simple/id_o20.c[516,529] [2021-12-21 13:20:05,619 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-21 13:20:05,627 INFO L208 MainTranslator]: Completed translation [2021-12-21 13:20:05,628 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 01:20:05 WrapperNode [2021-12-21 13:20:05,628 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-12-21 13:20:05,629 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-12-21 13:20:05,629 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-12-21 13:20:05,629 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-12-21 13:20:05,634 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 01:20:05" (1/1) ... [2021-12-21 13:20:05,638 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 01:20:05" (1/1) ... [2021-12-21 13:20:05,648 INFO L137 Inliner]: procedures = 13, calls = 9, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 19 [2021-12-21 13:20:05,649 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-12-21 13:20:05,649 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-12-21 13:20:05,649 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-12-21 13:20:05,649 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-12-21 13:20:05,654 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 01:20:05" (1/1) ... [2021-12-21 13:20:05,655 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 01:20:05" (1/1) ... [2021-12-21 13:20:05,655 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 01:20:05" (1/1) ... [2021-12-21 13:20:05,656 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 01:20:05" (1/1) ... [2021-12-21 13:20:05,657 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 01:20:05" (1/1) ... [2021-12-21 13:20:05,658 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 01:20:05" (1/1) ... [2021-12-21 13:20:05,658 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 01:20:05" (1/1) ... [2021-12-21 13:20:05,659 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-12-21 13:20:05,660 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-12-21 13:20:05,660 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-12-21 13:20:05,660 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-12-21 13:20:05,661 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 01:20:05" (1/1) ... [2021-12-21 13:20:05,665 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-21 13:20:05,675 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 13:20:05,690 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-12-21 13:20:05,692 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-12-21 13:20:05,714 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-12-21 13:20:05,719 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-12-21 13:20:05,720 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-12-21 13:20:05,720 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-12-21 13:20:05,720 INFO L130 BoogieDeclarations]: Found specification of procedure id [2021-12-21 13:20:05,720 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2021-12-21 13:20:05,765 INFO L234 CfgBuilder]: Building ICFG [2021-12-21 13:20:05,766 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2021-12-21 13:20:05,862 INFO L275 CfgBuilder]: Performing block encoding [2021-12-21 13:20:05,867 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-12-21 13:20:05,868 INFO L299 CfgBuilder]: Removed 0 assume(true) statements. [2021-12-21 13:20:05,869 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.12 01:20:05 BoogieIcfgContainer [2021-12-21 13:20:05,869 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-12-21 13:20:05,870 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-12-21 13:20:05,870 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-12-21 13:20:05,873 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-12-21 13:20:05,873 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.12 01:20:05" (1/3) ... [2021-12-21 13:20:05,874 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2d0c2359 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.12 01:20:05, skipping insertion in model container [2021-12-21 13:20:05,874 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 01:20:05" (2/3) ... [2021-12-21 13:20:05,874 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2d0c2359 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.12 01:20:05, skipping insertion in model container [2021-12-21 13:20:05,875 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.12 01:20:05" (3/3) ... [2021-12-21 13:20:05,876 INFO L111 eAbstractionObserver]: Analyzing ICFG id_o20.c [2021-12-21 13:20:05,879 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-12-21 13:20:05,879 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-12-21 13:20:05,920 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-12-21 13:20:05,928 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-12-21 13:20:05,929 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-12-21 13:20:05,942 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) [2021-12-21 13:20:05,954 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-12-21 13:20:05,954 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 13:20:05,955 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 13:20:05,955 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 13:20:05,960 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 13:20:05,960 INFO L85 PathProgramCache]: Analyzing trace with hash -358017204, now seen corresponding path program 1 times [2021-12-21 13:20:05,965 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 13:20:05,966 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [884602907] [2021-12-21 13:20:05,966 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 13:20:05,967 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 13:20:06,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:20:06,118 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-21 13:20:06,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:20:06,186 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 13:20:06,187 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 13:20:06,187 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [884602907] [2021-12-21 13:20:06,188 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [884602907] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 13:20:06,188 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-21 13:20:06,188 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-12-21 13:20:06,189 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [988208216] [2021-12-21 13:20:06,190 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 13:20:06,193 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-12-21 13:20:06,193 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 13:20:06,218 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-12-21 13:20:06,219 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-12-21 13:20:06,220 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, 5 states have (on average 1.6) internal successors, (8), 4 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) [2021-12-21 13:20:06,249 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 13:20:06,249 INFO L93 Difference]: Finished difference Result 28 states and 30 transitions. [2021-12-21 13:20:06,250 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-12-21 13:20:06,251 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 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 [2021-12-21 13:20:06,251 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 13:20:06,256 INFO L225 Difference]: With dead ends: 28 [2021-12-21 13:20:06,256 INFO L226 Difference]: Without dead ends: 15 [2021-12-21 13:20:06,259 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-12-21 13:20:06,264 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 3 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 55 SdHoareTripleChecker+Invalid, 12 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-21 13:20:06,266 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 55 Invalid, 12 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-21 13:20:06,277 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2021-12-21 13:20:06,295 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2021-12-21 13:20:06,296 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) [2021-12-21 13:20:06,297 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2021-12-21 13:20:06,298 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 10 [2021-12-21 13:20:06,298 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 13:20:06,299 INFO L470 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2021-12-21 13:20:06,299 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 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) [2021-12-21 13:20:06,299 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2021-12-21 13:20:06,300 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-12-21 13:20:06,300 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 13:20:06,300 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 13:20:06,301 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-12-21 13:20:06,301 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 13:20:06,303 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 13:20:06,304 INFO L85 PathProgramCache]: Analyzing trace with hash 679465686, now seen corresponding path program 1 times [2021-12-21 13:20:06,304 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 13:20:06,304 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1842617146] [2021-12-21 13:20:06,304 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 13:20:06,305 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 13:20:06,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:20:06,389 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-21 13:20:06,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:20:06,429 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-21 13:20:06,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:20:06,453 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-12-21 13:20:06,454 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 13:20:06,454 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1842617146] [2021-12-21 13:20:06,454 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1842617146] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 13:20:06,454 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [546447689] [2021-12-21 13:20:06,454 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 13:20:06,454 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 13:20:06,455 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 13:20:06,456 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 13:20:06,470 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-12-21 13:20:06,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:20:06,504 INFO L263 TraceCheckSpWp]: Trace formula consists of 56 conjuncts, 12 conjunts are in the unsatisfiable core [2021-12-21 13:20:06,508 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 13:20:06,669 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-12-21 13:20:06,669 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 13:20:06,808 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-12-21 13:20:06,809 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [546447689] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 13:20:06,809 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 13:20:06,809 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 13 [2021-12-21 13:20:06,810 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1301675055] [2021-12-21 13:20:06,810 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 13:20:06,810 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-12-21 13:20:06,811 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 13:20:06,811 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-12-21 13:20:06,811 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2021-12-21 13:20:06,812 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand has 13 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 9 states have internal predecessors, (19), 1 states have call successors, (2), 1 states have call predecessors, (2), 4 states have return successors, (4), 4 states have call predecessors, (4), 1 states have call successors, (4) [2021-12-21 13:20:06,841 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 13:20:06,841 INFO L93 Difference]: Finished difference Result 27 states and 29 transitions. [2021-12-21 13:20:06,841 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-12-21 13:20:06,841 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 9 states have internal predecessors, (19), 1 states have call successors, (2), 1 states have call predecessors, (2), 4 states have return successors, (4), 4 states have call predecessors, (4), 1 states have call successors, (4) Word has length 16 [2021-12-21 13:20:06,842 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 13:20:06,842 INFO L225 Difference]: With dead ends: 27 [2021-12-21 13:20:06,842 INFO L226 Difference]: Without dead ends: 21 [2021-12-21 13:20:06,843 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 29 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2021-12-21 13:20:06,844 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 0 mSDsluCounter, 87 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 101 SdHoareTripleChecker+Invalid, 31 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-21 13:20:06,845 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 101 Invalid, 31 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 29 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-21 13:20:06,847 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-12-21 13:20:06,850 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2021-12-21 13:20:06,851 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) [2021-12-21 13:20:06,852 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2021-12-21 13:20:06,852 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 16 [2021-12-21 13:20:06,853 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 13:20:06,853 INFO L470 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2021-12-21 13:20:06,854 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 9 states have internal predecessors, (19), 1 states have call successors, (2), 1 states have call predecessors, (2), 4 states have return successors, (4), 4 states have call predecessors, (4), 1 states have call successors, (4) [2021-12-21 13:20:06,854 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2021-12-21 13:20:06,855 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-12-21 13:20:06,855 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 13:20:06,855 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 13:20:06,875 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-12-21 13:20:07,070 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 13:20:07,070 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 13:20:07,071 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 13:20:07,071 INFO L85 PathProgramCache]: Analyzing trace with hash 1769866774, now seen corresponding path program 2 times [2021-12-21 13:20:07,071 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 13:20:07,072 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [220922728] [2021-12-21 13:20:07,072 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 13:20:07,073 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 13:20:07,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:20:07,155 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-21 13:20:07,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:20:07,192 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-21 13:20:07,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:20:07,247 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-21 13:20:07,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:20:07,285 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-21 13:20:07,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:20:07,311 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-12-21 13:20:07,311 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 13:20:07,311 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [220922728] [2021-12-21 13:20:07,312 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [220922728] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 13:20:07,314 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1797345638] [2021-12-21 13:20:07,315 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-21 13:20:07,315 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 13:20:07,315 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 13:20:07,316 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 13:20:07,317 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-12-21 13:20:07,348 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-21 13:20:07,348 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 13:20:07,349 INFO L263 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 20 conjunts are in the unsatisfiable core [2021-12-21 13:20:07,350 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 13:20:07,486 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-12-21 13:20:07,486 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 13:20:07,771 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-12-21 13:20:07,771 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1797345638] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 13:20:07,771 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 13:20:07,771 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 21 [2021-12-21 13:20:07,771 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1858324354] [2021-12-21 13:20:07,771 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 13:20:07,772 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-12-21 13:20:07,772 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 13:20:07,772 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-12-21 13:20:07,772 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=352, Unknown=0, NotChecked=0, Total=420 [2021-12-21 13:20:07,773 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand has 21 states, 21 states have (on average 1.2857142857142858) internal successors, (27), 13 states have internal predecessors, (27), 1 states have call successors, (2), 1 states have call predecessors, (2), 8 states have return successors, (8), 8 states have call predecessors, (8), 1 states have call successors, (8) [2021-12-21 13:20:07,915 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 13:20:07,915 INFO L93 Difference]: Finished difference Result 39 states and 43 transitions. [2021-12-21 13:20:07,916 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-12-21 13:20:07,917 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.2857142857142858) internal successors, (27), 13 states have internal predecessors, (27), 1 states have call successors, (2), 1 states have call predecessors, (2), 8 states have return successors, (8), 8 states have call predecessors, (8), 1 states have call successors, (8) Word has length 28 [2021-12-21 13:20:07,917 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 13:20:07,917 INFO L225 Difference]: With dead ends: 39 [2021-12-21 13:20:07,917 INFO L226 Difference]: Without dead ends: 33 [2021-12-21 13:20:07,918 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 53 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 47 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=102, Invalid=498, Unknown=0, NotChecked=0, Total=600 [2021-12-21 13:20:07,918 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 0 mSDsluCounter, 185 mSDsCounter, 0 mSdLazyCounter, 73 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 203 SdHoareTripleChecker+Invalid, 79 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 73 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 13:20:07,919 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 203 Invalid, 79 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 73 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 13:20:07,919 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-12-21 13:20:07,922 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2021-12-21 13:20:07,923 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) [2021-12-21 13:20:07,923 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2021-12-21 13:20:07,924 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 28 [2021-12-21 13:20:07,924 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 13:20:07,924 INFO L470 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2021-12-21 13:20:07,924 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 1.2857142857142858) internal successors, (27), 13 states have internal predecessors, (27), 1 states have call successors, (2), 1 states have call predecessors, (2), 8 states have return successors, (8), 8 states have call predecessors, (8), 1 states have call successors, (8) [2021-12-21 13:20:07,924 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2021-12-21 13:20:07,925 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-12-21 13:20:07,925 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 13:20:07,925 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 13:20:07,942 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2021-12-21 13:20:08,135 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-12-21 13:20:08,135 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 13:20:08,136 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 13:20:08,136 INFO L85 PathProgramCache]: Analyzing trace with hash -626238314, now seen corresponding path program 3 times [2021-12-21 13:20:08,136 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 13:20:08,136 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1395129280] [2021-12-21 13:20:08,136 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 13:20:08,136 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 13:20:08,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:20:08,197 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-21 13:20:08,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:20:08,255 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-21 13:20:08,263 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:20:08,287 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-21 13:20:08,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:20:08,324 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-21 13:20:08,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:20:08,362 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-21 13:20:08,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:20:08,409 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-21 13:20:08,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:20:08,445 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-21 13:20:08,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:20:08,481 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-21 13:20:08,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:20:08,501 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-12-21 13:20:08,502 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 13:20:08,502 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1395129280] [2021-12-21 13:20:08,502 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1395129280] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 13:20:08,502 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [530349079] [2021-12-21 13:20:08,502 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-21 13:20:08,502 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 13:20:08,503 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 13:20:08,508 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 13:20:08,509 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-12-21 13:20:08,558 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-12-21 13:20:08,559 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 13:20:08,560 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 36 conjunts are in the unsatisfiable core [2021-12-21 13:20:08,561 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 13:20:08,728 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-12-21 13:20:08,728 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 13:20:09,490 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-12-21 13:20:09,490 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [530349079] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 13:20:09,490 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 13:20:09,490 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 37 [2021-12-21 13:20:09,490 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [761878780] [2021-12-21 13:20:09,490 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 13:20:09,491 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2021-12-21 13:20:09,491 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 13:20:09,491 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-12-21 13:20:09,492 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=188, Invalid=1144, Unknown=0, NotChecked=0, Total=1332 [2021-12-21 13:20:09,492 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand has 37 states, 37 states have (on average 1.162162162162162) internal successors, (43), 21 states have internal predecessors, (43), 1 states have call successors, (2), 1 states have call predecessors, (2), 16 states have return successors, (16), 16 states have call predecessors, (16), 1 states have call successors, (16) [2021-12-21 13:20:12,200 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 13:20:12,200 INFO L93 Difference]: Finished difference Result 63 states and 71 transitions. [2021-12-21 13:20:12,203 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-12-21 13:20:12,203 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 1.162162162162162) internal successors, (43), 21 states have internal predecessors, (43), 1 states have call successors, (2), 1 states have call predecessors, (2), 16 states have return successors, (16), 16 states have call predecessors, (16), 1 states have call successors, (16) Word has length 52 [2021-12-21 13:20:12,204 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 13:20:12,205 INFO L225 Difference]: With dead ends: 63 [2021-12-21 13:20:12,205 INFO L226 Difference]: Without dead ends: 57 [2021-12-21 13:20:12,206 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 101 SyntacticMatches, 1 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 183 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=386, Invalid=1966, Unknown=0, NotChecked=0, Total=2352 [2021-12-21 13:20:12,206 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 0 mSDsluCounter, 399 mSDsCounter, 0 mSdLazyCounter, 222 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 425 SdHoareTripleChecker+Invalid, 236 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 222 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-21 13:20:12,207 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 425 Invalid, 236 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 222 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-21 13:20:12,207 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-12-21 13:20:12,211 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2021-12-21 13:20:12,212 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) [2021-12-21 13:20:12,212 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 58 transitions. [2021-12-21 13:20:12,213 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 58 transitions. Word has length 52 [2021-12-21 13:20:12,213 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 13:20:12,213 INFO L470 AbstractCegarLoop]: Abstraction has 57 states and 58 transitions. [2021-12-21 13:20:12,213 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 1.162162162162162) internal successors, (43), 21 states have internal predecessors, (43), 1 states have call successors, (2), 1 states have call predecessors, (2), 16 states have return successors, (16), 16 states have call predecessors, (16), 1 states have call successors, (16) [2021-12-21 13:20:12,213 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 58 transitions. [2021-12-21 13:20:12,215 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2021-12-21 13:20:12,215 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 13:20:12,215 INFO L514 BasicCegarLoop]: trace histogram [16, 16, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 13:20:12,234 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2021-12-21 13:20:12,431 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 13:20:12,431 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 13:20:12,432 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 13:20:12,432 INFO L85 PathProgramCache]: Analyzing trace with hash 415287702, now seen corresponding path program 4 times [2021-12-21 13:20:12,432 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 13:20:12,432 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [662140079] [2021-12-21 13:20:12,432 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 13:20:12,432 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 13:20:12,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:20:12,483 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-21 13:20:12,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:20:12,549 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-21 13:20:12,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:20:12,615 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-21 13:20:12,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:20:12,675 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-21 13:20:12,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:20:12,729 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-21 13:20:12,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:20:12,783 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-21 13:20:12,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:20:12,826 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-21 13:20:12,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:20:12,864 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-21 13:20:12,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:20:12,904 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-21 13:20:12,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:20:12,951 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-21 13:20:12,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:20:13,000 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-21 13:20:13,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:20:13,052 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-21 13:20:13,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:20:13,105 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-21 13:20:13,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:20:13,159 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-21 13:20:13,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:20:13,211 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-21 13:20:13,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:20:13,287 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-21 13:20:13,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:20:13,319 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2021-12-21 13:20:13,319 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 13:20:13,319 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [662140079] [2021-12-21 13:20:13,319 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [662140079] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 13:20:13,319 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [574997914] [2021-12-21 13:20:13,319 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-21 13:20:13,320 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 13:20:13,320 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 13:20:13,320 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 13:20:13,321 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-12-21 13:20:13,398 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-21 13:20:13,398 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 13:20:13,399 INFO L263 TraceCheckSpWp]: Trace formula consists of 224 conjuncts, 68 conjunts are in the unsatisfiable core [2021-12-21 13:20:13,402 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 13:20:13,673 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2021-12-21 13:20:13,673 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 13:20:16,168 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2021-12-21 13:20:16,168 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [574997914] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 13:20:16,169 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 13:20:16,169 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 69 [2021-12-21 13:20:16,169 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1634599034] [2021-12-21 13:20:16,169 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 13:20:16,169 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 69 states [2021-12-21 13:20:16,169 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 13:20:16,170 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2021-12-21 13:20:16,171 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=599, Invalid=4093, Unknown=0, NotChecked=0, Total=4692 [2021-12-21 13:20:16,171 INFO L87 Difference]: Start difference. First operand 57 states and 58 transitions. Second operand has 69 states, 69 states have (on average 1.0869565217391304) internal successors, (75), 37 states have internal predecessors, (75), 1 states have call successors, (2), 1 states have call predecessors, (2), 32 states have return successors, (32), 32 states have call predecessors, (32), 1 states have call successors, (32) [2021-12-21 13:20:29,710 WARN L227 SmtUtils]: Spent 9.65s on a formula simplification that was a NOOP. DAG size: 74 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-12-21 13:20:41,406 WARN L227 SmtUtils]: Spent 8.48s on a formula simplification that was a NOOP. DAG size: 72 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-12-21 13:20:51,541 WARN L227 SmtUtils]: Spent 6.57s on a formula simplification that was a NOOP. DAG size: 69 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate)