./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/array-fpi/eqn3.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 35987657 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/array-fpi/eqn3.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 b0fb0070f46fa34e60f2a21833c13b7b67c557f142ffbdfed9bc8ff3d84f7456 --- Real Ultimate output --- This is Ultimate 0.2.2-?-3598765 [2022-07-20 22:02:38,691 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-07-20 22:02:38,692 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-07-20 22:02:38,722 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-07-20 22:02:38,724 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-07-20 22:02:38,725 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-07-20 22:02:38,728 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-07-20 22:02:38,732 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-07-20 22:02:38,733 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-07-20 22:02:38,735 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-07-20 22:02:38,736 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-07-20 22:02:38,737 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-07-20 22:02:38,737 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-07-20 22:02:38,738 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-07-20 22:02:38,740 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-07-20 22:02:38,741 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-07-20 22:02:38,742 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-07-20 22:02:38,743 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-07-20 22:02:38,746 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-07-20 22:02:38,749 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-07-20 22:02:38,751 INFO L181 SettingsManager]: Resetting HornVerifier preferences to default values [2022-07-20 22:02:38,752 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-07-20 22:02:38,753 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-07-20 22:02:38,753 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-07-20 22:02:38,754 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-07-20 22:02:38,760 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-07-20 22:02:38,761 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-07-20 22:02:38,761 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-07-20 22:02:38,762 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-07-20 22:02:38,762 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-07-20 22:02:38,763 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-07-20 22:02:38,763 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-07-20 22:02:38,764 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-07-20 22:02:38,765 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-07-20 22:02:38,765 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-07-20 22:02:38,766 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-07-20 22:02:38,766 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-07-20 22:02:38,766 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-07-20 22:02:38,767 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-07-20 22:02:38,767 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-07-20 22:02:38,767 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-07-20 22:02:38,769 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-07-20 22:02:38,770 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2022-07-20 22:02:38,793 INFO L113 SettingsManager]: Loading preferences was successful [2022-07-20 22:02:38,794 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-07-20 22:02:38,795 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-07-20 22:02:38,795 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-07-20 22:02:38,795 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-07-20 22:02:38,795 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-07-20 22:02:38,796 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-07-20 22:02:38,796 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-07-20 22:02:38,796 INFO L138 SettingsManager]: * Use SBE=true [2022-07-20 22:02:38,797 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-07-20 22:02:38,797 INFO L138 SettingsManager]: * sizeof long=4 [2022-07-20 22:02:38,797 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-07-20 22:02:38,798 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-07-20 22:02:38,798 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-07-20 22:02:38,798 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-07-20 22:02:38,798 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-07-20 22:02:38,798 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-07-20 22:02:38,798 INFO L138 SettingsManager]: * sizeof long double=12 [2022-07-20 22:02:38,798 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-07-20 22:02:38,799 INFO L138 SettingsManager]: * Use constant arrays=true [2022-07-20 22:02:38,799 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-07-20 22:02:38,799 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-07-20 22:02:38,799 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-07-20 22:02:38,799 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-07-20 22:02:38,800 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-07-20 22:02:38,800 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-07-20 22:02:38,800 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-07-20 22:02:38,800 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-07-20 22:02:38,800 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2022-07-20 22:02:38,800 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-07-20 22:02:38,801 INFO L138 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2022-07-20 22:02:38,801 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2022-07-20 22:02:38,801 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-07-20 22:02:38,801 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> b0fb0070f46fa34e60f2a21833c13b7b67c557f142ffbdfed9bc8ff3d84f7456 [2022-07-20 22:02:38,954 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-07-20 22:02:38,978 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-07-20 22:02:38,980 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-07-20 22:02:38,981 INFO L271 PluginConnector]: Initializing CDTParser... [2022-07-20 22:02:38,981 INFO L275 PluginConnector]: CDTParser initialized [2022-07-20 22:02:38,982 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/array-fpi/eqn3.c [2022-07-20 22:02:39,043 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0ad6c60f1/3d23da270d1b4364a539b34188fadd9c/FLAG2b5062e49 [2022-07-20 22:02:39,383 INFO L306 CDTParser]: Found 1 translation units. [2022-07-20 22:02:39,384 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-fpi/eqn3.c [2022-07-20 22:02:39,387 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0ad6c60f1/3d23da270d1b4364a539b34188fadd9c/FLAG2b5062e49 [2022-07-20 22:02:39,833 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0ad6c60f1/3d23da270d1b4364a539b34188fadd9c [2022-07-20 22:02:39,835 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-07-20 22:02:39,836 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-07-20 22:02:39,837 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-07-20 22:02:39,838 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-07-20 22:02:39,840 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-07-20 22:02:39,840 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 10:02:39" (1/1) ... [2022-07-20 22:02:39,841 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5d6b62c3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:02:39, skipping insertion in model container [2022-07-20 22:02:39,841 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 10:02:39" (1/1) ... [2022-07-20 22:02:39,845 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-07-20 22:02:39,854 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-07-20 22:02:40,004 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/array-fpi/eqn3.c[587,600] [2022-07-20 22:02:40,030 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-07-20 22:02:40,036 INFO L203 MainTranslator]: Completed pre-run [2022-07-20 22:02:40,046 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/array-fpi/eqn3.c[587,600] [2022-07-20 22:02:40,055 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-07-20 22:02:40,065 INFO L208 MainTranslator]: Completed translation [2022-07-20 22:02:40,065 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:02:40 WrapperNode [2022-07-20 22:02:40,065 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-07-20 22:02:40,066 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-07-20 22:02:40,067 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-07-20 22:02:40,067 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-07-20 22:02:40,072 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:02:40" (1/1) ... [2022-07-20 22:02:40,077 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:02:40" (1/1) ... [2022-07-20 22:02:40,092 INFO L137 Inliner]: procedures = 16, calls = 26, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 79 [2022-07-20 22:02:40,092 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-07-20 22:02:40,093 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-07-20 22:02:40,093 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-07-20 22:02:40,093 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-07-20 22:02:40,099 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:02:40" (1/1) ... [2022-07-20 22:02:40,100 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:02:40" (1/1) ... [2022-07-20 22:02:40,101 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:02:40" (1/1) ... [2022-07-20 22:02:40,102 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:02:40" (1/1) ... [2022-07-20 22:02:40,105 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:02:40" (1/1) ... [2022-07-20 22:02:40,109 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:02:40" (1/1) ... [2022-07-20 22:02:40,110 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:02:40" (1/1) ... [2022-07-20 22:02:40,111 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-07-20 22:02:40,112 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-07-20 22:02:40,112 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-07-20 22:02:40,112 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-07-20 22:02:40,113 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:02:40" (1/1) ... [2022-07-20 22:02:40,120 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-07-20 22:02:40,128 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-20 22:02:40,139 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) [2022-07-20 22:02:40,141 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 [2022-07-20 22:02:40,173 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-07-20 22:02:40,173 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-07-20 22:02:40,173 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-07-20 22:02:40,174 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2022-07-20 22:02:40,174 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-07-20 22:02:40,174 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-07-20 22:02:40,174 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-07-20 22:02:40,219 INFO L234 CfgBuilder]: Building ICFG [2022-07-20 22:02:40,220 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-07-20 22:02:40,392 INFO L275 CfgBuilder]: Performing block encoding [2022-07-20 22:02:40,409 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-07-20 22:02:40,410 INFO L299 CfgBuilder]: Removed 3 assume(true) statements. [2022-07-20 22:02:40,411 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 10:02:40 BoogieIcfgContainer [2022-07-20 22:02:40,411 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-07-20 22:02:40,412 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-07-20 22:02:40,417 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-07-20 22:02:40,420 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-07-20 22:02:40,421 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 10:02:39" (1/3) ... [2022-07-20 22:02:40,421 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@77dbf5df and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 10:02:40, skipping insertion in model container [2022-07-20 22:02:40,425 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:02:40" (2/3) ... [2022-07-20 22:02:40,425 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@77dbf5df and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 10:02:40, skipping insertion in model container [2022-07-20 22:02:40,425 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 10:02:40" (3/3) ... [2022-07-20 22:02:40,426 INFO L111 eAbstractionObserver]: Analyzing ICFG eqn3.c [2022-07-20 22:02:40,439 INFO L201 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-07-20 22:02:40,439 INFO L160 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-07-20 22:02:40,468 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-07-20 22:02:40,472 INFO L357 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, mPorIndependenceSettings=de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings@554ea334, mLbeIndependenceSettings=de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings@3863637c [2022-07-20 22:02:40,472 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-07-20 22:02:40,475 INFO L276 IsEmpty]: Start isEmpty. Operand has 21 states, 19 states have (on average 1.5263157894736843) internal successors, (29), 20 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-20 22:02:40,479 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-07-20 22:02:40,479 INFO L187 NwaCegarLoop]: Found error trace [2022-07-20 22:02:40,479 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-20 22:02:40,480 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-07-20 22:02:40,483 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-20 22:02:40,483 INFO L85 PathProgramCache]: Analyzing trace with hash -1828546148, now seen corresponding path program 1 times [2022-07-20 22:02:40,489 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-20 22:02:40,489 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [105986892] [2022-07-20 22:02:40,489 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-20 22:02:40,490 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-20 22:02:40,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-20 22:02:40,574 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-20 22:02:40,574 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-20 22:02:40,574 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [105986892] [2022-07-20 22:02:40,575 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [105986892] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-20 22:02:40,575 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-20 22:02:40,575 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-07-20 22:02:40,576 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [158752875] [2022-07-20 22:02:40,577 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-20 22:02:40,579 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2022-07-20 22:02:40,579 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-20 22:02:40,594 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2022-07-20 22:02:40,595 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-07-20 22:02:40,596 INFO L87 Difference]: Start difference. First operand has 21 states, 19 states have (on average 1.5263157894736843) internal successors, (29), 20 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 2 states, 2 states have (on average 6.0) internal successors, (12), 2 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-20 22:02:40,604 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-20 22:02:40,605 INFO L93 Difference]: Finished difference Result 38 states and 52 transitions. [2022-07-20 22:02:40,605 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2022-07-20 22:02:40,606 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 6.0) internal successors, (12), 2 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2022-07-20 22:02:40,606 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-20 22:02:40,610 INFO L225 Difference]: With dead ends: 38 [2022-07-20 22:02:40,610 INFO L226 Difference]: Without dead ends: 17 [2022-07-20 22:02:40,612 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-07-20 22:02:40,614 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 0 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 0 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 0 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-07-20 22:02:40,615 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-07-20 22:02:40,625 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2022-07-20 22:02:40,631 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2022-07-20 22:02:40,632 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 16 states have (on average 1.1875) internal successors, (19), 16 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-20 22:02:40,632 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2022-07-20 22:02:40,633 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 12 [2022-07-20 22:02:40,633 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-20 22:02:40,634 INFO L495 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2022-07-20 22:02:40,634 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 6.0) internal successors, (12), 2 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-20 22:02:40,634 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2022-07-20 22:02:40,634 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-07-20 22:02:40,634 INFO L187 NwaCegarLoop]: Found error trace [2022-07-20 22:02:40,634 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-20 22:02:40,635 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-07-20 22:02:40,635 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-07-20 22:02:40,635 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-20 22:02:40,636 INFO L85 PathProgramCache]: Analyzing trace with hash -1148487778, now seen corresponding path program 1 times [2022-07-20 22:02:40,636 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-20 22:02:40,636 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1401900820] [2022-07-20 22:02:40,636 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-20 22:02:40,636 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-20 22:02:40,656 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-07-20 22:02:40,658 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [725838565] [2022-07-20 22:02:40,658 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-20 22:02:40,658 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-20 22:02:40,658 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-20 22:02:40,688 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) [2022-07-20 22:02:40,689 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-07-20 22:02:40,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-20 22:02:40,765 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 11 conjunts are in the unsatisfiable core [2022-07-20 22:02:40,770 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-20 22:02:40,836 INFO L356 Elim1Store]: treesize reduction 26, result has 42.2 percent of original size [2022-07-20 22:02:40,844 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 36 treesize of output 74 [2022-07-20 22:02:40,860 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2022-07-20 22:02:40,875 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2022-07-20 22:02:41,006 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2022-07-20 22:02:41,099 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-20 22:02:41,099 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-07-20 22:02:41,099 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-20 22:02:41,099 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1401900820] [2022-07-20 22:02:41,100 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-07-20 22:02:41,100 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [725838565] [2022-07-20 22:02:41,101 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [725838565] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-20 22:02:41,101 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-20 22:02:41,101 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-07-20 22:02:41,102 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1667850749] [2022-07-20 22:02:41,102 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-20 22:02:41,102 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-07-20 22:02:41,102 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-20 22:02:41,103 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-07-20 22:02:41,103 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-07-20 22:02:41,104 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand has 5 states, 5 states have (on average 2.4) internal successors, (12), 5 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-20 22:02:41,180 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-20 22:02:41,181 INFO L93 Difference]: Finished difference Result 34 states and 38 transitions. [2022-07-20 22:02:41,183 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-07-20 22:02:41,184 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 5 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2022-07-20 22:02:41,184 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-20 22:02:41,186 INFO L225 Difference]: With dead ends: 34 [2022-07-20 22:02:41,186 INFO L226 Difference]: Without dead ends: 32 [2022-07-20 22:02:41,187 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2022-07-20 22:02:41,189 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 12 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-07-20 22:02:41,191 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 56 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 33 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-07-20 22:02:41,193 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2022-07-20 22:02:41,201 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 23. [2022-07-20 22:02:41,203 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 22 states have (on average 1.2272727272727273) internal successors, (27), 22 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-20 22:02:41,204 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 27 transitions. [2022-07-20 22:02:41,204 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 27 transitions. Word has length 12 [2022-07-20 22:02:41,204 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-20 22:02:41,204 INFO L495 AbstractCegarLoop]: Abstraction has 23 states and 27 transitions. [2022-07-20 22:02:41,204 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 5 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-20 22:02:41,205 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 27 transitions. [2022-07-20 22:02:41,205 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-07-20 22:02:41,206 INFO L187 NwaCegarLoop]: Found error trace [2022-07-20 22:02:41,206 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-20 22:02:41,238 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2022-07-20 22:02:41,420 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-20 22:02:41,420 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-07-20 22:02:41,421 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-20 22:02:41,421 INFO L85 PathProgramCache]: Analyzing trace with hash 1755224028, now seen corresponding path program 1 times [2022-07-20 22:02:41,421 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-20 22:02:41,421 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1114747098] [2022-07-20 22:02:41,421 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-20 22:02:41,422 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-20 22:02:41,439 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-07-20 22:02:41,440 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1740882574] [2022-07-20 22:02:41,440 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-20 22:02:41,440 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-20 22:02:41,440 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-20 22:02:41,460 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) [2022-07-20 22:02:41,461 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-07-20 22:02:41,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-20 22:02:41,507 INFO L263 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 4 conjunts are in the unsatisfiable core [2022-07-20 22:02:41,508 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-20 22:02:41,537 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-20 22:02:41,537 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-07-20 22:02:41,537 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-20 22:02:41,537 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1114747098] [2022-07-20 22:02:41,537 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-07-20 22:02:41,538 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1740882574] [2022-07-20 22:02:41,538 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1740882574] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-20 22:02:41,538 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-20 22:02:41,538 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-07-20 22:02:41,538 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1073553149] [2022-07-20 22:02:41,538 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-20 22:02:41,539 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-07-20 22:02:41,539 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-20 22:02:41,539 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-07-20 22:02:41,539 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-07-20 22:02:41,539 INFO L87 Difference]: Start difference. First operand 23 states and 27 transitions. Second operand has 5 states, 5 states have (on average 2.8) internal successors, (14), 5 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-20 22:02:41,589 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-20 22:02:41,590 INFO L93 Difference]: Finished difference Result 49 states and 55 transitions. [2022-07-20 22:02:41,590 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-07-20 22:02:41,590 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 5 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2022-07-20 22:02:41,590 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-20 22:02:41,591 INFO L225 Difference]: With dead ends: 49 [2022-07-20 22:02:41,591 INFO L226 Difference]: Without dead ends: 40 [2022-07-20 22:02:41,591 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2022-07-20 22:02:41,592 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 26 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-07-20 22:02:41,592 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [26 Valid, 29 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-07-20 22:02:41,593 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2022-07-20 22:02:41,595 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 23. [2022-07-20 22:02:41,595 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 22 states have (on average 1.1818181818181819) internal successors, (26), 22 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-20 22:02:41,596 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 26 transitions. [2022-07-20 22:02:41,596 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 26 transitions. Word has length 14 [2022-07-20 22:02:41,596 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-20 22:02:41,596 INFO L495 AbstractCegarLoop]: Abstraction has 23 states and 26 transitions. [2022-07-20 22:02:41,596 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 5 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-20 22:02:41,597 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 26 transitions. [2022-07-20 22:02:41,597 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-07-20 22:02:41,597 INFO L187 NwaCegarLoop]: Found error trace [2022-07-20 22:02:41,597 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-20 22:02:41,622 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-07-20 22:02:41,809 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2022-07-20 22:02:41,810 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-07-20 22:02:41,810 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-20 22:02:41,810 INFO L85 PathProgramCache]: Analyzing trace with hash -1842440164, now seen corresponding path program 1 times [2022-07-20 22:02:41,810 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-20 22:02:41,810 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2111664910] [2022-07-20 22:02:41,811 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-20 22:02:41,811 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-20 22:02:41,829 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-07-20 22:02:41,830 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [695580364] [2022-07-20 22:02:41,830 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-20 22:02:41,830 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-20 22:02:41,830 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-20 22:02:41,831 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) [2022-07-20 22:02:41,833 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-07-20 22:02:41,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-20 22:02:41,896 INFO L263 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 4 conjunts are in the unsatisfiable core [2022-07-20 22:02:41,902 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-20 22:02:41,921 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-20 22:02:41,921 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-20 22:02:41,933 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-20 22:02:41,934 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-20 22:02:41,934 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2111664910] [2022-07-20 22:02:41,934 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-07-20 22:02:41,934 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [695580364] [2022-07-20 22:02:41,934 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [695580364] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-20 22:02:41,934 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-20 22:02:41,934 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2022-07-20 22:02:41,934 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2099057179] [2022-07-20 22:02:41,935 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-20 22:02:41,935 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-07-20 22:02:41,935 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-20 22:02:41,935 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-07-20 22:02:41,936 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-07-20 22:02:41,936 INFO L87 Difference]: Start difference. First operand 23 states and 26 transitions. Second operand has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 6 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-20 22:02:42,005 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-20 22:02:42,006 INFO L93 Difference]: Finished difference Result 44 states and 48 transitions. [2022-07-20 22:02:42,006 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-07-20 22:02:42,006 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 6 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2022-07-20 22:02:42,006 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-20 22:02:42,007 INFO L225 Difference]: With dead ends: 44 [2022-07-20 22:02:42,007 INFO L226 Difference]: Without dead ends: 37 [2022-07-20 22:02:42,007 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=54, Unknown=0, NotChecked=0, Total=90 [2022-07-20 22:02:42,008 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 23 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 60 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 46 SdHoareTripleChecker+Invalid, 72 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 60 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-07-20 22:02:42,008 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [23 Valid, 46 Invalid, 72 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 60 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-07-20 22:02:42,008 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2022-07-20 22:02:42,010 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 24. [2022-07-20 22:02:42,011 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 23 states have (on average 1.173913043478261) internal successors, (27), 23 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-20 22:02:42,011 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 27 transitions. [2022-07-20 22:02:42,011 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 27 transitions. Word has length 14 [2022-07-20 22:02:42,011 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-20 22:02:42,012 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 27 transitions. [2022-07-20 22:02:42,012 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 6 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-20 22:02:42,012 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 27 transitions. [2022-07-20 22:02:42,012 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2022-07-20 22:02:42,012 INFO L187 NwaCegarLoop]: Found error trace [2022-07-20 22:02:42,012 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-20 22:02:42,041 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-07-20 22:02:42,242 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-20 22:02:42,242 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-07-20 22:02:42,242 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-20 22:02:42,243 INFO L85 PathProgramCache]: Analyzing trace with hash -1667884396, now seen corresponding path program 1 times [2022-07-20 22:02:42,243 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-20 22:02:42,243 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [877065917] [2022-07-20 22:02:42,243 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-20 22:02:42,243 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-20 22:02:42,255 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-07-20 22:02:42,256 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [315899943] [2022-07-20 22:02:42,256 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-20 22:02:42,256 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-20 22:02:42,256 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-20 22:02:42,257 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) [2022-07-20 22:02:42,258 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-07-20 22:02:42,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-20 22:02:42,300 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 5 conjunts are in the unsatisfiable core [2022-07-20 22:02:42,301 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-20 22:02:42,333 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-20 22:02:42,333 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-07-20 22:02:42,333 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-20 22:02:42,333 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [877065917] [2022-07-20 22:02:42,334 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-07-20 22:02:42,334 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [315899943] [2022-07-20 22:02:42,334 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [315899943] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-20 22:02:42,334 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-20 22:02:42,334 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-07-20 22:02:42,334 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [206963652] [2022-07-20 22:02:42,334 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-20 22:02:42,335 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-07-20 22:02:42,335 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-20 22:02:42,335 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-07-20 22:02:42,335 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2022-07-20 22:02:42,335 INFO L87 Difference]: Start difference. First operand 24 states and 27 transitions. Second operand has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 6 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-20 22:02:42,389 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-20 22:02:42,389 INFO L93 Difference]: Finished difference Result 41 states and 44 transitions. [2022-07-20 22:02:42,390 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-07-20 22:02:42,390 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 6 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2022-07-20 22:02:42,390 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-20 22:02:42,390 INFO L225 Difference]: With dead ends: 41 [2022-07-20 22:02:42,390 INFO L226 Difference]: Without dead ends: 27 [2022-07-20 22:02:42,391 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2022-07-20 22:02:42,391 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 18 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 44 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 32 SdHoareTripleChecker+Invalid, 52 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 44 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-07-20 22:02:42,392 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 32 Invalid, 52 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 44 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-07-20 22:02:42,392 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2022-07-20 22:02:42,393 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 19. [2022-07-20 22:02:42,394 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 18 states have (on average 1.1666666666666667) internal successors, (21), 18 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-20 22:02:42,394 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2022-07-20 22:02:42,394 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 16 [2022-07-20 22:02:42,394 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-20 22:02:42,394 INFO L495 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2022-07-20 22:02:42,395 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 6 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-20 22:02:42,395 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2022-07-20 22:02:42,395 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2022-07-20 22:02:42,395 INFO L187 NwaCegarLoop]: Found error trace [2022-07-20 22:02:42,395 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-20 22:02:42,414 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-07-20 22:02:42,609 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-20 22:02:42,609 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-07-20 22:02:42,610 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-20 22:02:42,610 INFO L85 PathProgramCache]: Analyzing trace with hash 586911962, now seen corresponding path program 1 times [2022-07-20 22:02:42,610 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-20 22:02:42,610 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [661307814] [2022-07-20 22:02:42,610 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-20 22:02:42,610 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-20 22:02:42,629 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-07-20 22:02:42,630 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [53471847] [2022-07-20 22:02:42,631 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-20 22:02:42,631 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-20 22:02:42,631 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-20 22:02:42,641 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) [2022-07-20 22:02:42,643 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-07-20 22:02:42,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-20 22:02:42,697 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 22 conjunts are in the unsatisfiable core [2022-07-20 22:02:42,700 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-20 22:02:42,707 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2022-07-20 22:02:42,710 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 22:02:42,711 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 14 [2022-07-20 22:02:42,713 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2022-07-20 22:02:42,722 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 16 [2022-07-20 22:02:42,746 INFO L356 Elim1Store]: treesize reduction 21, result has 25.0 percent of original size [2022-07-20 22:02:42,746 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 20 [2022-07-20 22:02:42,778 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-20 22:02:42,778 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-20 22:02:42,910 WARN L833 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_147 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~a~0#1.base| v_ArrVal_147) |c_ULTIMATE.start_main_~b~0#1.base|) |c_ULTIMATE.start_main_~b~0#1.offset|) 1)) is different from false [2022-07-20 22:02:42,918 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 1 not checked. [2022-07-20 22:02:42,918 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-20 22:02:42,918 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [661307814] [2022-07-20 22:02:42,918 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-07-20 22:02:42,918 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [53471847] [2022-07-20 22:02:42,919 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [53471847] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-20 22:02:42,919 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-20 22:02:42,919 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2022-07-20 22:02:42,919 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1456090407] [2022-07-20 22:02:42,919 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-20 22:02:42,919 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-07-20 22:02:42,919 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-20 22:02:42,920 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-07-20 22:02:42,920 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=52, Unknown=1, NotChecked=14, Total=90 [2022-07-20 22:02:42,920 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand has 10 states, 10 states have (on average 2.2) internal successors, (22), 10 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-20 22:02:43,017 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-20 22:02:43,018 INFO L93 Difference]: Finished difference Result 35 states and 38 transitions. [2022-07-20 22:02:43,018 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-07-20 22:02:43,018 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.2) internal successors, (22), 10 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2022-07-20 22:02:43,019 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-20 22:02:43,019 INFO L225 Difference]: With dead ends: 35 [2022-07-20 22:02:43,019 INFO L226 Difference]: Without dead ends: 33 [2022-07-20 22:02:43,019 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 21 SyntacticMatches, 2 SemanticMatches, 12 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=110, Unknown=1, NotChecked=22, Total=182 [2022-07-20 22:02:43,020 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 31 mSDsluCounter, 49 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 65 SdHoareTripleChecker+Invalid, 86 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 36 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-07-20 22:02:43,020 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [31 Valid, 65 Invalid, 86 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 42 Invalid, 0 Unknown, 36 Unchecked, 0.1s Time] [2022-07-20 22:02:43,020 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2022-07-20 22:02:43,022 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 24. [2022-07-20 22:02:43,022 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 23 states have (on average 1.173913043478261) internal successors, (27), 23 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-20 22:02:43,022 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 27 transitions. [2022-07-20 22:02:43,023 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 27 transitions. Word has length 16 [2022-07-20 22:02:43,023 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-20 22:02:43,023 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 27 transitions. [2022-07-20 22:02:43,023 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.2) internal successors, (22), 10 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-20 22:02:43,023 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 27 transitions. [2022-07-20 22:02:43,023 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2022-07-20 22:02:43,023 INFO L187 NwaCegarLoop]: Found error trace [2022-07-20 22:02:43,024 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-20 22:02:43,042 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-07-20 22:02:43,240 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-20 22:02:43,240 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-07-20 22:02:43,241 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-20 22:02:43,241 INFO L85 PathProgramCache]: Analyzing trace with hash -1267903976, now seen corresponding path program 2 times [2022-07-20 22:02:43,241 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-20 22:02:43,241 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [959855117] [2022-07-20 22:02:43,241 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-20 22:02:43,241 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-20 22:02:43,263 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-07-20 22:02:43,264 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1820779870] [2022-07-20 22:02:43,268 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-07-20 22:02:43,269 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-20 22:02:43,269 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-20 22:02:43,277 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) [2022-07-20 22:02:43,278 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-07-20 22:02:43,328 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-07-20 22:02:43,328 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-20 22:02:43,329 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 6 conjunts are in the unsatisfiable core [2022-07-20 22:02:43,330 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-20 22:02:43,359 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-20 22:02:43,359 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-20 22:02:43,377 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-20 22:02:43,378 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-20 22:02:43,378 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [959855117] [2022-07-20 22:02:43,378 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-07-20 22:02:43,378 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1820779870] [2022-07-20 22:02:43,378 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1820779870] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-20 22:02:43,378 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-20 22:02:43,378 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 9 [2022-07-20 22:02:43,379 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [996628270] [2022-07-20 22:02:43,379 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-20 22:02:43,379 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-07-20 22:02:43,379 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-20 22:02:43,379 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-07-20 22:02:43,380 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2022-07-20 22:02:43,380 INFO L87 Difference]: Start difference. First operand 24 states and 27 transitions. Second operand has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 9 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-20 22:02:43,507 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-20 22:02:43,507 INFO L93 Difference]: Finished difference Result 60 states and 66 transitions. [2022-07-20 22:02:43,508 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-07-20 22:02:43,508 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 9 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2022-07-20 22:02:43,508 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-20 22:02:43,508 INFO L225 Difference]: With dead ends: 60 [2022-07-20 22:02:43,508 INFO L226 Difference]: Without dead ends: 51 [2022-07-20 22:02:43,509 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2022-07-20 22:02:43,509 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 37 mSDsluCounter, 26 mSDsCounter, 0 mSdLazyCounter, 53 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 77 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 53 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-07-20 22:02:43,509 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [37 Valid, 37 Invalid, 77 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 53 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-07-20 22:02:43,510 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2022-07-20 22:02:43,512 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 30. [2022-07-20 22:02:43,512 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 29 states have (on average 1.1724137931034482) internal successors, (34), 29 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-20 22:02:43,512 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 34 transitions. [2022-07-20 22:02:43,512 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 34 transitions. Word has length 18 [2022-07-20 22:02:43,512 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-20 22:02:43,512 INFO L495 AbstractCegarLoop]: Abstraction has 30 states and 34 transitions. [2022-07-20 22:02:43,513 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 9 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-20 22:02:43,513 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 34 transitions. [2022-07-20 22:02:43,513 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-07-20 22:02:43,513 INFO L187 NwaCegarLoop]: Found error trace [2022-07-20 22:02:43,513 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-20 22:02:43,545 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-07-20 22:02:43,713 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-20 22:02:43,713 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-07-20 22:02:43,714 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-20 22:02:43,714 INFO L85 PathProgramCache]: Analyzing trace with hash 798963152, now seen corresponding path program 1 times [2022-07-20 22:02:43,714 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-20 22:02:43,714 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1575422015] [2022-07-20 22:02:43,714 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-20 22:02:43,715 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-20 22:02:43,736 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-07-20 22:02:43,736 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [484292763] [2022-07-20 22:02:43,736 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-20 22:02:43,736 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-20 22:02:43,736 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-20 22:02:43,752 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) [2022-07-20 22:02:43,771 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-07-20 22:02:43,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-20 22:02:43,841 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 34 conjunts are in the unsatisfiable core [2022-07-20 22:02:43,844 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-20 22:02:43,866 INFO L356 Elim1Store]: treesize reduction 13, result has 58.1 percent of original size [2022-07-20 22:02:43,866 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 46 treesize of output 54 [2022-07-20 22:02:43,886 INFO L356 Elim1Store]: treesize reduction 35, result has 34.0 percent of original size [2022-07-20 22:02:43,887 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 46 treesize of output 71 [2022-07-20 22:02:43,895 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2022-07-20 22:02:43,910 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2022-07-20 22:02:43,935 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2022-07-20 22:02:43,946 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2022-07-20 22:02:43,957 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 5 [2022-07-20 22:02:43,959 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2022-07-20 22:02:43,978 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2022-07-20 22:02:44,009 INFO L356 Elim1Store]: treesize reduction 21, result has 25.0 percent of original size [2022-07-20 22:02:44,010 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 30 [2022-07-20 22:02:44,046 INFO L356 Elim1Store]: treesize reduction 23, result has 23.3 percent of original size [2022-07-20 22:02:44,047 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 38 treesize of output 32 [2022-07-20 22:02:44,148 INFO L356 Elim1Store]: treesize reduction 9, result has 10.0 percent of original size [2022-07-20 22:02:44,148 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 62 treesize of output 28 [2022-07-20 22:02:44,155 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-20 22:02:44,156 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-20 22:02:44,469 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-20 22:02:44,469 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-20 22:02:44,470 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1575422015] [2022-07-20 22:02:44,470 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-07-20 22:02:44,470 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [484292763] [2022-07-20 22:02:44,470 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [484292763] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-20 22:02:44,470 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-20 22:02:44,470 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 14 [2022-07-20 22:02:44,470 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [759314175] [2022-07-20 22:02:44,470 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-20 22:02:44,471 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-07-20 22:02:44,471 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-20 22:02:44,471 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-07-20 22:02:44,471 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=142, Unknown=0, NotChecked=0, Total=182 [2022-07-20 22:02:44,471 INFO L87 Difference]: Start difference. First operand 30 states and 34 transitions. Second operand has 14 states, 14 states have (on average 2.4285714285714284) internal successors, (34), 14 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-20 22:02:44,564 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-20 22:02:44,564 INFO L93 Difference]: Finished difference Result 39 states and 43 transitions. [2022-07-20 22:02:44,564 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-07-20 22:02:44,564 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.4285714285714284) internal successors, (34), 14 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2022-07-20 22:02:44,565 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-20 22:02:44,565 INFO L225 Difference]: With dead ends: 39 [2022-07-20 22:02:44,565 INFO L226 Difference]: Without dead ends: 37 [2022-07-20 22:02:44,565 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=60, Invalid=180, Unknown=0, NotChecked=0, Total=240 [2022-07-20 22:02:44,565 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 8 mSDsluCounter, 46 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 58 SdHoareTripleChecker+Invalid, 64 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 14 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-07-20 22:02:44,566 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 58 Invalid, 64 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 40 Invalid, 0 Unknown, 14 Unchecked, 0.1s Time] [2022-07-20 22:02:44,566 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2022-07-20 22:02:44,568 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2022-07-20 22:02:44,568 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 34 states have (on average 1.1470588235294117) internal successors, (39), 34 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-20 22:02:44,569 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2022-07-20 22:02:44,569 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 20 [2022-07-20 22:02:44,569 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-20 22:02:44,569 INFO L495 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2022-07-20 22:02:44,569 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.4285714285714284) internal successors, (34), 14 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-20 22:02:44,569 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2022-07-20 22:02:44,570 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-07-20 22:02:44,570 INFO L187 NwaCegarLoop]: Found error trace [2022-07-20 22:02:44,570 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-20 22:02:44,623 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-07-20 22:02:44,779 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-20 22:02:44,780 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-07-20 22:02:44,780 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-20 22:02:44,780 INFO L85 PathProgramCache]: Analyzing trace with hash -1786143722, now seen corresponding path program 3 times [2022-07-20 22:02:44,780 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-20 22:02:44,780 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1019975062] [2022-07-20 22:02:44,780 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-20 22:02:44,780 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-20 22:02:44,802 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-07-20 22:02:44,802 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [237988791] [2022-07-20 22:02:44,802 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-07-20 22:02:44,802 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-20 22:02:44,802 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-20 22:02:44,803 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) [2022-07-20 22:02:44,810 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-07-20 22:02:44,931 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-07-20 22:02:44,931 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-20 22:02:44,932 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 33 conjunts are in the unsatisfiable core [2022-07-20 22:02:44,934 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-20 22:02:44,940 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2022-07-20 22:02:44,945 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 22:02:44,946 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 14 [2022-07-20 22:02:44,949 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2022-07-20 22:02:44,960 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 16 [2022-07-20 22:02:44,974 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 16 [2022-07-20 22:02:45,012 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 22:02:45,013 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 24 [2022-07-20 22:02:45,034 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 22:02:45,035 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 20 [2022-07-20 22:02:45,059 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-20 22:02:45,059 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-20 22:02:45,282 WARN L833 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_270 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~a~0#1.base| v_ArrVal_270) |c_ULTIMATE.start_main_~b~0#1.base|) |c_ULTIMATE.start_main_~b~0#1.offset|) 1)) is different from false [2022-07-20 22:02:45,291 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 3 not checked. [2022-07-20 22:02:45,291 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-20 22:02:45,291 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1019975062] [2022-07-20 22:02:45,291 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-07-20 22:02:45,291 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [237988791] [2022-07-20 22:02:45,292 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [237988791] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-20 22:02:45,292 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-20 22:02:45,292 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 15 [2022-07-20 22:02:45,292 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [637542731] [2022-07-20 22:02:45,292 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-20 22:02:45,292 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-07-20 22:02:45,292 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-20 22:02:45,293 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-07-20 22:02:45,293 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=129, Unknown=1, NotChecked=24, Total=210 [2022-07-20 22:02:45,293 INFO L87 Difference]: Start difference. First operand 35 states and 39 transitions. Second operand has 15 states, 15 states have (on average 2.2666666666666666) internal successors, (34), 15 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-20 22:02:45,584 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-20 22:02:45,584 INFO L93 Difference]: Finished difference Result 98 states and 105 transitions. [2022-07-20 22:02:45,584 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-07-20 22:02:45,584 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.2666666666666666) internal successors, (34), 15 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2022-07-20 22:02:45,585 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-20 22:02:45,585 INFO L225 Difference]: With dead ends: 98 [2022-07-20 22:02:45,585 INFO L226 Difference]: Without dead ends: 96 [2022-07-20 22:02:45,586 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 26 SyntacticMatches, 3 SemanticMatches, 24 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 121 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=160, Invalid=443, Unknown=1, NotChecked=46, Total=650 [2022-07-20 22:02:45,586 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 114 mSDsluCounter, 107 mSDsCounter, 0 mSdLazyCounter, 109 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 114 SdHoareTripleChecker+Valid, 124 SdHoareTripleChecker+Invalid, 254 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 109 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 116 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-07-20 22:02:45,586 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [114 Valid, 124 Invalid, 254 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 109 Invalid, 0 Unknown, 116 Unchecked, 0.1s Time] [2022-07-20 22:02:45,587 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2022-07-20 22:02:45,590 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 39. [2022-07-20 22:02:45,590 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 38 states have (on average 1.1842105263157894) internal successors, (45), 38 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-20 22:02:45,590 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 45 transitions. [2022-07-20 22:02:45,591 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 45 transitions. Word has length 20 [2022-07-20 22:02:45,591 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-20 22:02:45,591 INFO L495 AbstractCegarLoop]: Abstraction has 39 states and 45 transitions. [2022-07-20 22:02:45,591 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 2.2666666666666666) internal successors, (34), 15 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-20 22:02:45,591 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 45 transitions. [2022-07-20 22:02:45,592 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-07-20 22:02:45,592 INFO L187 NwaCegarLoop]: Found error trace [2022-07-20 22:02:45,592 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-20 22:02:45,629 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-07-20 22:02:45,810 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2022-07-20 22:02:45,810 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-07-20 22:02:45,810 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-20 22:02:45,810 INFO L85 PathProgramCache]: Analyzing trace with hash 986773582, now seen corresponding path program 2 times [2022-07-20 22:02:45,811 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-20 22:02:45,811 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [228055934] [2022-07-20 22:02:45,811 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-20 22:02:45,811 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-20 22:02:45,827 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-07-20 22:02:45,827 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [973364175] [2022-07-20 22:02:45,827 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-07-20 22:02:45,827 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-20 22:02:45,828 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-20 22:02:45,829 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) [2022-07-20 22:02:45,860 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-07-20 22:02:45,911 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-07-20 22:02:45,911 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-20 22:02:45,924 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 6 conjunts are in the unsatisfiable core [2022-07-20 22:02:45,925 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-20 22:02:45,953 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-07-20 22:02:45,953 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-20 22:02:45,971 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-07-20 22:02:45,972 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-20 22:02:45,972 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [228055934] [2022-07-20 22:02:45,972 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-07-20 22:02:45,972 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [973364175] [2022-07-20 22:02:45,972 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [973364175] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-20 22:02:45,972 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-20 22:02:45,972 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 9 [2022-07-20 22:02:45,973 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1901422915] [2022-07-20 22:02:45,973 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-20 22:02:45,973 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-07-20 22:02:45,973 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-20 22:02:45,973 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-07-20 22:02:45,974 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2022-07-20 22:02:45,974 INFO L87 Difference]: Start difference. First operand 39 states and 45 transitions. Second operand has 9 states, 9 states have (on average 2.7777777777777777) internal successors, (25), 9 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-20 22:02:46,100 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-20 22:02:46,101 INFO L93 Difference]: Finished difference Result 68 states and 74 transitions. [2022-07-20 22:02:46,101 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-07-20 22:02:46,101 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.7777777777777777) internal successors, (25), 9 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2022-07-20 22:02:46,101 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-20 22:02:46,102 INFO L225 Difference]: With dead ends: 68 [2022-07-20 22:02:46,102 INFO L226 Difference]: Without dead ends: 59 [2022-07-20 22:02:46,102 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=68, Invalid=142, Unknown=0, NotChecked=0, Total=210 [2022-07-20 22:02:46,102 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 39 mSDsluCounter, 43 mSDsCounter, 0 mSdLazyCounter, 116 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 63 SdHoareTripleChecker+Invalid, 132 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 116 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-07-20 22:02:46,103 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [39 Valid, 63 Invalid, 132 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 116 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-07-20 22:02:46,103 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2022-07-20 22:02:46,106 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 39. [2022-07-20 22:02:46,106 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 38 states have (on average 1.1578947368421053) internal successors, (44), 38 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-20 22:02:46,107 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 44 transitions. [2022-07-20 22:02:46,107 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 44 transitions. Word has length 22 [2022-07-20 22:02:46,107 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-20 22:02:46,107 INFO L495 AbstractCegarLoop]: Abstraction has 39 states and 44 transitions. [2022-07-20 22:02:46,107 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.7777777777777777) internal successors, (25), 9 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-20 22:02:46,107 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 44 transitions. [2022-07-20 22:02:46,108 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-07-20 22:02:46,108 INFO L187 NwaCegarLoop]: Found error trace [2022-07-20 22:02:46,108 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-20 22:02:46,148 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-07-20 22:02:46,326 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-07-20 22:02:46,326 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-07-20 22:02:46,326 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-20 22:02:46,326 INFO L85 PathProgramCache]: Analyzing trace with hash 1197174726, now seen corresponding path program 3 times [2022-07-20 22:02:46,327 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-20 22:02:46,327 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [201978176] [2022-07-20 22:02:46,327 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-20 22:02:46,327 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-20 22:02:46,339 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-07-20 22:02:46,339 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [450459803] [2022-07-20 22:02:46,339 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-07-20 22:02:46,340 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-20 22:02:46,340 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-20 22:02:46,341 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) [2022-07-20 22:02:46,367 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-07-20 22:02:46,414 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-07-20 22:02:46,414 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-20 22:02:46,415 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 7 conjunts are in the unsatisfiable core [2022-07-20 22:02:46,416 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-20 22:02:46,461 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 8 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-07-20 22:02:46,461 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-20 22:02:46,490 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 8 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-07-20 22:02:46,491 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-20 22:02:46,491 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [201978176] [2022-07-20 22:02:46,491 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-07-20 22:02:46,491 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [450459803] [2022-07-20 22:02:46,491 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [450459803] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-20 22:02:46,491 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-20 22:02:46,491 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 11 [2022-07-20 22:02:46,492 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1118295310] [2022-07-20 22:02:46,492 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-20 22:02:46,492 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-07-20 22:02:46,492 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-20 22:02:46,492 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-07-20 22:02:46,493 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=75, Unknown=0, NotChecked=0, Total=110 [2022-07-20 22:02:46,493 INFO L87 Difference]: Start difference. First operand 39 states and 44 transitions. Second operand has 11 states, 11 states have (on average 3.090909090909091) internal successors, (34), 11 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-20 22:02:46,592 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-20 22:02:46,593 INFO L93 Difference]: Finished difference Result 63 states and 68 transitions. [2022-07-20 22:02:46,593 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-07-20 22:02:46,593 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 3.090909090909091) internal successors, (34), 11 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2022-07-20 22:02:46,593 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-20 22:02:46,593 INFO L225 Difference]: With dead ends: 63 [2022-07-20 22:02:46,594 INFO L226 Difference]: Without dead ends: 43 [2022-07-20 22:02:46,594 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=80, Invalid=160, Unknown=0, NotChecked=0, Total=240 [2022-07-20 22:02:46,594 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 29 mSDsluCounter, 43 mSDsCounter, 0 mSdLazyCounter, 75 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 58 SdHoareTripleChecker+Invalid, 99 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 75 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-07-20 22:02:46,595 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [29 Valid, 58 Invalid, 99 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 75 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-07-20 22:02:46,595 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2022-07-20 22:02:46,597 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 30. [2022-07-20 22:02:46,597 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 29 states have (on average 1.1724137931034482) internal successors, (34), 29 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-20 22:02:46,597 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 34 transitions. [2022-07-20 22:02:46,597 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 34 transitions. Word has length 24 [2022-07-20 22:02:46,598 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-20 22:02:46,598 INFO L495 AbstractCegarLoop]: Abstraction has 30 states and 34 transitions. [2022-07-20 22:02:46,598 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 3.090909090909091) internal successors, (34), 11 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-20 22:02:46,598 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 34 transitions. [2022-07-20 22:02:46,598 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-07-20 22:02:46,598 INFO L187 NwaCegarLoop]: Found error trace [2022-07-20 22:02:46,598 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-20 22:02:46,632 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-07-20 22:02:46,816 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2022-07-20 22:02:46,816 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-07-20 22:02:46,816 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-20 22:02:46,817 INFO L85 PathProgramCache]: Analyzing trace with hash 1232945932, now seen corresponding path program 4 times [2022-07-20 22:02:46,817 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-20 22:02:46,817 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1786801862] [2022-07-20 22:02:46,817 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-20 22:02:46,817 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-20 22:02:46,833 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-07-20 22:02:46,833 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [924066261] [2022-07-20 22:02:46,833 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-07-20 22:02:46,834 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-20 22:02:46,834 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-20 22:02:46,852 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) [2022-07-20 22:02:46,882 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-07-20 22:02:47,020 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-07-20 22:02:47,021 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-20 22:02:47,022 INFO L263 TraceCheckSpWp]: Trace formula consists of 140 conjuncts, 50 conjunts are in the unsatisfiable core [2022-07-20 22:02:47,024 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-20 22:02:47,033 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2022-07-20 22:02:47,036 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 22:02:47,038 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 23 [2022-07-20 22:02:47,041 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 20 [2022-07-20 22:02:47,044 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2022-07-20 22:02:47,047 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2022-07-20 22:02:47,077 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 22:02:47,079 INFO L356 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2022-07-20 22:02:47,079 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 32 treesize of output 34 [2022-07-20 22:02:47,102 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 22:02:47,102 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 22:02:47,103 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 22:02:47,119 INFO L356 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2022-07-20 22:02:47,120 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 36 treesize of output 41 [2022-07-20 22:02:47,217 INFO L356 Elim1Store]: treesize reduction 23, result has 17.9 percent of original size [2022-07-20 22:02:47,218 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 159 treesize of output 143 [2022-07-20 22:02:47,221 INFO L173 IndexEqualityManager]: detected equality via solver [2022-07-20 22:02:47,222 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 22:02:47,222 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 22:02:47,223 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 22:02:47,223 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 22:02:47,224 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 22:02:47,225 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 22:02:47,226 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 2 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 123 treesize of output 197 [2022-07-20 22:02:47,240 WARN L234 Elim1Store]: Array PQE input equivalent to false [2022-07-20 22:02:47,328 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 22:02:47,329 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 22:02:47,330 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 22:02:47,330 INFO L173 IndexEqualityManager]: detected equality via solver [2022-07-20 22:02:47,331 INFO L173 IndexEqualityManager]: detected equality via solver [2022-07-20 22:02:47,331 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 22:02:47,338 INFO L356 Elim1Store]: treesize reduction 35, result has 16.7 percent of original size [2022-07-20 22:02:47,338 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 3 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 11 case distinctions, treesize of input 68 treesize of output 65 [2022-07-20 22:02:47,490 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-20 22:02:47,490 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-20 22:02:50,406 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-20 22:02:50,406 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-20 22:02:50,406 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1786801862] [2022-07-20 22:02:50,406 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-07-20 22:02:50,406 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [924066261] [2022-07-20 22:02:50,407 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [924066261] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-20 22:02:50,407 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-20 22:02:50,407 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 22 [2022-07-20 22:02:50,407 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1991755001] [2022-07-20 22:02:50,407 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-20 22:02:50,407 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-07-20 22:02:50,407 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-20 22:02:50,408 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-07-20 22:02:50,408 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=367, Unknown=0, NotChecked=0, Total=462 [2022-07-20 22:02:50,408 INFO L87 Difference]: Start difference. First operand 30 states and 34 transitions. Second operand has 22 states, 22 states have (on average 1.9090909090909092) internal successors, (42), 22 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-20 22:03:05,129 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 12.51s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=true, quantifiers [] [2022-07-20 22:03:07,420 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-20 22:03:07,421 INFO L93 Difference]: Finished difference Result 63 states and 72 transitions. [2022-07-20 22:03:07,421 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-07-20 22:03:07,421 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.9090909090909092) internal successors, (42), 22 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2022-07-20 22:03:07,421 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-20 22:03:07,422 INFO L225 Difference]: With dead ends: 63 [2022-07-20 22:03:07,422 INFO L226 Difference]: Without dead ends: 61 [2022-07-20 22:03:07,423 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 222 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=194, Invalid=798, Unknown=0, NotChecked=0, Total=992 [2022-07-20 22:03:07,428 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 12 mSDsluCounter, 68 mSDsCounter, 0 mSdLazyCounter, 122 mSolverCounterSat, 28 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 13.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 78 SdHoareTripleChecker+Invalid, 193 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 122 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 42 IncrementalHoareTripleChecker+Unchecked, 13.7s IncrementalHoareTripleChecker+Time [2022-07-20 22:03:07,429 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 78 Invalid, 193 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 122 Invalid, 1 Unknown, 42 Unchecked, 13.7s Time] [2022-07-20 22:03:07,429 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2022-07-20 22:03:07,438 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 53. [2022-07-20 22:03:07,438 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 52 states have (on average 1.1923076923076923) internal successors, (62), 52 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-20 22:03:07,440 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 62 transitions. [2022-07-20 22:03:07,441 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 62 transitions. Word has length 24 [2022-07-20 22:03:07,441 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-20 22:03:07,441 INFO L495 AbstractCegarLoop]: Abstraction has 53 states and 62 transitions. [2022-07-20 22:03:07,441 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 1.9090909090909092) internal successors, (42), 22 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-20 22:03:07,441 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 62 transitions. [2022-07-20 22:03:07,443 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-07-20 22:03:07,443 INFO L187 NwaCegarLoop]: Found error trace [2022-07-20 22:03:07,443 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-20 22:03:07,461 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-07-20 22:03:07,661 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2022-07-20 22:03:07,661 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-07-20 22:03:07,661 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-20 22:03:07,661 INFO L85 PathProgramCache]: Analyzing trace with hash -900609774, now seen corresponding path program 4 times [2022-07-20 22:03:07,662 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-20 22:03:07,662 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1107261775] [2022-07-20 22:03:07,662 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-20 22:03:07,662 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-20 22:03:07,694 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-07-20 22:03:07,700 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1764025817] [2022-07-20 22:03:07,701 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-07-20 22:03:07,702 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-20 22:03:07,702 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-20 22:03:07,707 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) [2022-07-20 22:03:07,708 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-07-20 22:03:07,777 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-07-20 22:03:07,777 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-20 22:03:07,778 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 9 conjunts are in the unsatisfiable core [2022-07-20 22:03:07,779 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-20 22:03:07,835 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 16 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-20 22:03:07,835 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-20 22:03:07,887 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 16 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-20 22:03:07,887 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-20 22:03:07,887 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1107261775] [2022-07-20 22:03:07,887 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-07-20 22:03:07,888 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1764025817] [2022-07-20 22:03:07,888 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1764025817] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-20 22:03:07,888 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-20 22:03:07,888 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 16 [2022-07-20 22:03:07,888 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2120094684] [2022-07-20 22:03:07,888 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-20 22:03:07,888 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-07-20 22:03:07,889 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-20 22:03:07,889 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-07-20 22:03:07,889 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=171, Unknown=0, NotChecked=0, Total=240 [2022-07-20 22:03:07,889 INFO L87 Difference]: Start difference. First operand 53 states and 62 transitions. Second operand has 16 states, 16 states have (on average 2.25) internal successors, (36), 16 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-20 22:03:08,164 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-20 22:03:08,164 INFO L93 Difference]: Finished difference Result 133 states and 144 transitions. [2022-07-20 22:03:08,165 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-07-20 22:03:08,165 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.25) internal successors, (36), 16 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2022-07-20 22:03:08,165 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-20 22:03:08,165 INFO L225 Difference]: With dead ends: 133 [2022-07-20 22:03:08,165 INFO L226 Difference]: Without dead ends: 112 [2022-07-20 22:03:08,166 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 242 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=268, Invalid=724, Unknown=0, NotChecked=0, Total=992 [2022-07-20 22:03:08,166 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 137 mSDsluCounter, 79 mSDsCounter, 0 mSdLazyCounter, 140 mSolverCounterSat, 75 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 137 SdHoareTripleChecker+Valid, 96 SdHoareTripleChecker+Invalid, 215 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 75 IncrementalHoareTripleChecker+Valid, 140 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-07-20 22:03:08,166 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [137 Valid, 96 Invalid, 215 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [75 Valid, 140 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-07-20 22:03:08,167 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2022-07-20 22:03:08,171 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 66. [2022-07-20 22:03:08,171 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 65 states have (on average 1.1384615384615384) internal successors, (74), 65 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-20 22:03:08,175 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 74 transitions. [2022-07-20 22:03:08,175 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 74 transitions. Word has length 24 [2022-07-20 22:03:08,176 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-20 22:03:08,176 INFO L495 AbstractCegarLoop]: Abstraction has 66 states and 74 transitions. [2022-07-20 22:03:08,176 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 2.25) internal successors, (36), 16 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-20 22:03:08,176 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 74 transitions. [2022-07-20 22:03:08,176 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-07-20 22:03:08,176 INFO L187 NwaCegarLoop]: Found error trace [2022-07-20 22:03:08,176 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-20 22:03:08,193 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-07-20 22:03:08,385 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-07-20 22:03:08,385 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-07-20 22:03:08,385 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-20 22:03:08,386 INFO L85 PathProgramCache]: Analyzing trace with hash -55017726, now seen corresponding path program 5 times [2022-07-20 22:03:08,386 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-20 22:03:08,386 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2067225498] [2022-07-20 22:03:08,386 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-20 22:03:08,386 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-20 22:03:08,397 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-07-20 22:03:08,407 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1397953206] [2022-07-20 22:03:08,407 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2022-07-20 22:03:08,408 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-20 22:03:08,408 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-20 22:03:08,409 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) [2022-07-20 22:03:08,410 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-07-20 22:03:12,903 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2022-07-20 22:03:12,903 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-20 22:03:12,909 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 50 conjunts are in the unsatisfiable core [2022-07-20 22:03:12,912 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-20 22:03:12,939 INFO L356 Elim1Store]: treesize reduction 13, result has 58.1 percent of original size [2022-07-20 22:03:12,939 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 46 treesize of output 54 [2022-07-20 22:03:12,957 INFO L356 Elim1Store]: treesize reduction 35, result has 34.0 percent of original size [2022-07-20 22:03:12,958 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 46 treesize of output 71 [2022-07-20 22:03:12,964 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2022-07-20 22:03:12,985 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 2 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 45 treesize of output 59 [2022-07-20 22:03:12,994 INFO L173 IndexEqualityManager]: detected equality via solver [2022-07-20 22:03:12,994 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 3 [2022-07-20 22:03:13,017 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 23 [2022-07-20 22:03:13,034 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2022-07-20 22:03:13,047 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 5 [2022-07-20 22:03:13,049 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2022-07-20 22:03:13,071 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2022-07-20 22:03:13,109 INFO L356 Elim1Store]: treesize reduction 23, result has 17.9 percent of original size [2022-07-20 22:03:13,109 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 117 treesize of output 109 [2022-07-20 22:03:13,115 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 22:03:13,115 INFO L173 IndexEqualityManager]: detected equality via solver [2022-07-20 22:03:13,116 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 22:03:13,117 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 22:03:13,117 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 22:03:13,118 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 22:03:13,119 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 22:03:13,120 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 2 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 98 treesize of output 172 [2022-07-20 22:03:13,131 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 22:03:13,131 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 22:03:13,132 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 22:03:13,133 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 22:03:13,134 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 22:03:13,134 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 22:03:13,138 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 173 treesize of output 93 [2022-07-20 22:03:13,205 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 22:03:13,206 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 22:03:13,206 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 22:03:13,208 INFO L356 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2022-07-20 22:03:13,209 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 43 treesize of output 44 [2022-07-20 22:03:13,292 INFO L356 Elim1Store]: treesize reduction 23, result has 17.9 percent of original size [2022-07-20 22:03:13,293 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 177 treesize of output 161 [2022-07-20 22:03:13,298 INFO L173 IndexEqualityManager]: detected equality via solver [2022-07-20 22:03:13,299 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 22:03:13,299 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 22:03:13,300 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 22:03:13,301 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 22:03:13,301 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 22:03:13,302 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 22:03:13,303 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 2 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 123 treesize of output 197 [2022-07-20 22:03:13,418 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 22:03:13,419 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 22:03:13,420 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 22:03:13,420 INFO L173 IndexEqualityManager]: detected equality via solver [2022-07-20 22:03:13,421 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 22:03:13,423 INFO L356 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2022-07-20 22:03:13,423 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 72 treesize of output 58 [2022-07-20 22:03:13,670 INFO L356 Elim1Store]: treesize reduction 13, result has 23.5 percent of original size [2022-07-20 22:03:13,670 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 3 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 10 case distinctions, treesize of input 89 treesize of output 45 [2022-07-20 22:03:13,683 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-20 22:03:13,683 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-20 22:03:26,762 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-20 22:03:26,762 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-20 22:03:26,762 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2067225498] [2022-07-20 22:03:26,762 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-07-20 22:03:26,762 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1397953206] [2022-07-20 22:03:26,762 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1397953206] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-20 22:03:26,762 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-20 22:03:26,763 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14] total 24 [2022-07-20 22:03:26,763 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1103463714] [2022-07-20 22:03:26,763 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-20 22:03:26,763 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-07-20 22:03:26,763 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-20 22:03:26,763 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-07-20 22:03:26,764 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=455, Unknown=2, NotChecked=0, Total=552 [2022-07-20 22:03:26,764 INFO L87 Difference]: Start difference. First operand 66 states and 74 transitions. Second operand has 24 states, 24 states have (on average 2.0833333333333335) internal successors, (50), 24 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-20 22:03:27,896 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-20 22:03:27,897 INFO L93 Difference]: Finished difference Result 82 states and 89 transitions. [2022-07-20 22:03:27,897 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-07-20 22:03:27,897 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 2.0833333333333335) internal successors, (50), 24 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 28 [2022-07-20 22:03:27,899 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-20 22:03:27,899 INFO L225 Difference]: With dead ends: 82 [2022-07-20 22:03:27,899 INFO L226 Difference]: Without dead ends: 53 [2022-07-20 22:03:27,900 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 30 SyntacticMatches, 2 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 218 ImplicationChecksByTransitivity, 13.1s TimeCoverageRelationStatistics Valid=158, Invalid=710, Unknown=2, NotChecked=0, Total=870 [2022-07-20 22:03:27,900 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 14 mSDsluCounter, 97 mSDsCounter, 0 mSdLazyCounter, 124 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 108 SdHoareTripleChecker+Invalid, 213 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 124 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 73 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-07-20 22:03:27,901 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 108 Invalid, 213 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 124 Invalid, 0 Unknown, 73 Unchecked, 0.3s Time] [2022-07-20 22:03:27,901 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2022-07-20 22:03:27,906 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2022-07-20 22:03:27,906 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 52 states have (on average 1.1346153846153846) internal successors, (59), 52 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-20 22:03:27,906 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 59 transitions. [2022-07-20 22:03:27,906 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 59 transitions. Word has length 28 [2022-07-20 22:03:27,906 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-20 22:03:27,907 INFO L495 AbstractCegarLoop]: Abstraction has 53 states and 59 transitions. [2022-07-20 22:03:27,907 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 2.0833333333333335) internal successors, (50), 24 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-20 22:03:27,907 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 59 transitions. [2022-07-20 22:03:27,907 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-07-20 22:03:27,907 INFO L187 NwaCegarLoop]: Found error trace [2022-07-20 22:03:27,907 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-20 22:03:27,917 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-07-20 22:03:28,115 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-07-20 22:03:28,116 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-07-20 22:03:28,116 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-20 22:03:28,116 INFO L85 PathProgramCache]: Analyzing trace with hash 48972360, now seen corresponding path program 6 times [2022-07-20 22:03:28,116 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-20 22:03:28,117 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1261495515] [2022-07-20 22:03:28,117 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-20 22:03:28,117 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-20 22:03:28,139 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-07-20 22:03:28,142 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [450340130] [2022-07-20 22:03:28,142 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-07-20 22:03:28,142 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-20 22:03:28,142 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-20 22:03:28,143 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) [2022-07-20 22:03:28,152 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-07-20 22:03:28,610 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2022-07-20 22:03:28,610 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-20 22:03:28,613 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 60 conjunts are in the unsatisfiable core [2022-07-20 22:03:28,616 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-20 22:03:28,628 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2022-07-20 22:03:28,632 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 22:03:28,634 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 23 [2022-07-20 22:03:28,637 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 20 [2022-07-20 22:03:28,642 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2022-07-20 22:03:28,646 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2022-07-20 22:03:28,685 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 22:03:28,686 INFO L356 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2022-07-20 22:03:28,687 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 32 treesize of output 34 [2022-07-20 22:03:28,750 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 22:03:28,752 INFO L356 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2022-07-20 22:03:28,752 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 32 treesize of output 34 [2022-07-20 22:03:28,821 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 22:03:28,823 INFO L356 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2022-07-20 22:03:28,823 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 32 treesize of output 34 [2022-07-20 22:03:28,919 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 22:03:28,921 INFO L356 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2022-07-20 22:03:28,921 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 38 treesize of output 32 [2022-07-20 22:03:28,983 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-07-20 22:03:28,983 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 83 treesize of output 79 [2022-07-20 22:03:28,994 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 22:03:28,996 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 22:03:28,998 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 22:03:28,998 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 22:03:29,003 INFO L356 Elim1Store]: treesize reduction 70, result has 1.4 percent of original size [2022-07-20 22:03:29,003 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 2 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 62 treesize of output 107 [2022-07-20 22:03:29,008 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 22:03:29,010 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 1 [2022-07-20 22:03:29,188 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 119 treesize of output 113 [2022-07-20 22:03:29,205 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 22:03:29,207 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 22:03:29,208 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 22:03:29,210 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 22:03:29,211 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 22:03:29,212 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 22:03:29,218 INFO L356 Elim1Store]: treesize reduction 70, result has 1.4 percent of original size [2022-07-20 22:03:29,218 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 2 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 118 treesize of output 167 [2022-07-20 22:03:29,243 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-20 22:03:29,245 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 1 [2022-07-20 22:03:33,757 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-20 22:03:33,757 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-20 22:03:50,426 WARN L233 SmtUtils]: Spent 6.03s on a formula simplification that was a NOOP. DAG size: 50 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-07-20 22:05:46,125 WARN L233 SmtUtils]: Spent 1.74m on a formula simplification. DAG size of input: 128 DAG size of output: 67 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-07-20 22:06:08,209 WARN L233 SmtUtils]: Spent 5.26s on a formula simplification that was a NOOP. DAG size: 59 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-07-20 22:06:33,014 WARN L233 SmtUtils]: Spent 9.67s on a formula simplification that was a NOOP. DAG size: 94 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-07-20 22:06:43,813 WARN L233 SmtUtils]: Spent 8.37s on a formula simplification that was a NOOP. DAG size: 95 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-07-20 22:07:11,087 INFO L173 IndexEqualityManager]: detected equality via solver [2022-07-20 22:07:11,089 INFO L173 IndexEqualityManager]: detected equality via solver [2022-07-20 22:07:11,093 INFO L356 Elim1Store]: treesize reduction 15, result has 6.3 percent of original size [2022-07-20 22:07:11,093 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 144 treesize of output 1 [2022-07-20 22:07:11,095 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-20 22:07:11,095 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-20 22:07:11,096 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1261495515] [2022-07-20 22:07:11,096 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-07-20 22:07:11,096 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [450340130] [2022-07-20 22:07:11,096 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [450340130] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-20 22:07:11,096 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-20 22:07:11,096 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 20] total 36 [2022-07-20 22:07:11,096 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [8707234] [2022-07-20 22:07:11,096 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-20 22:07:11,097 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2022-07-20 22:07:11,097 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-20 22:07:11,097 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2022-07-20 22:07:11,097 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=214, Invalid=1019, Unknown=27, NotChecked=0, Total=1260 [2022-07-20 22:07:11,098 INFO L87 Difference]: Start difference. First operand 53 states and 59 transitions. Second operand has 36 states, 36 states have (on average 1.4722222222222223) internal successors, (53), 36 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)