./Ultimate.py --spec ../sv-benchmarks/c/properties/valid-memsafety.prp --file ../sv-benchmarks/c/memsafety-ext2/length_test03-1.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version c3fed411 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx15G -Xms4m -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/AutomizerMemDerefMemtrack.xml -i ../sv-benchmarks/c/memsafety-ext2/length_test03-1.i -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 6e9221de91e231efa38b63f264828813e89f68c8ac306a629b3513c0e7bf1ed0 --- Real Ultimate output --- This is Ultimate 0.2.2-tmp.no-commuhash-c3fed41 [2021-12-18 20:45:58,969 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-12-18 20:45:58,971 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-12-18 20:45:59,017 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-12-18 20:45:59,017 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-12-18 20:45:59,018 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-12-18 20:45:59,019 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-12-18 20:45:59,021 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-12-18 20:45:59,022 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-12-18 20:45:59,023 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-12-18 20:45:59,024 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-12-18 20:45:59,025 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-12-18 20:45:59,025 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-12-18 20:45:59,026 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-12-18 20:45:59,027 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-12-18 20:45:59,028 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-12-18 20:45:59,029 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-12-18 20:45:59,030 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-12-18 20:45:59,031 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-12-18 20:45:59,033 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-12-18 20:45:59,034 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-12-18 20:45:59,035 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-12-18 20:45:59,037 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-12-18 20:45:59,037 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-12-18 20:45:59,040 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-12-18 20:45:59,040 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-12-18 20:45:59,040 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-12-18 20:45:59,041 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-12-18 20:45:59,042 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-12-18 20:45:59,042 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-12-18 20:45:59,043 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-12-18 20:45:59,043 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-12-18 20:45:59,044 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-12-18 20:45:59,045 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-12-18 20:45:59,046 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-12-18 20:45:59,046 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-12-18 20:45:59,046 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-12-18 20:45:59,047 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-12-18 20:45:59,047 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-12-18 20:45:59,048 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-12-18 20:45:59,049 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-12-18 20:45:59,049 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf [2021-12-18 20:45:59,069 INFO L113 SettingsManager]: Loading preferences was successful [2021-12-18 20:45:59,070 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-12-18 20:45:59,070 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-12-18 20:45:59,070 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-12-18 20:45:59,071 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-12-18 20:45:59,071 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-12-18 20:45:59,072 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-12-18 20:45:59,072 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-12-18 20:45:59,072 INFO L138 SettingsManager]: * Use SBE=true [2021-12-18 20:45:59,072 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-12-18 20:45:59,072 INFO L138 SettingsManager]: * sizeof long=4 [2021-12-18 20:45:59,073 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-12-18 20:45:59,073 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-12-18 20:45:59,073 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-12-18 20:45:59,073 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-12-18 20:45:59,073 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-12-18 20:45:59,073 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-12-18 20:45:59,074 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-12-18 20:45:59,074 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-12-18 20:45:59,074 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-12-18 20:45:59,074 INFO L138 SettingsManager]: * sizeof long double=12 [2021-12-18 20:45:59,074 INFO L138 SettingsManager]: * Use constant arrays=true [2021-12-18 20:45:59,075 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-12-18 20:45:59,075 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-12-18 20:45:59,075 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-12-18 20:45:59,075 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-18 20:45:59,075 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-12-18 20:45:59,076 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-12-18 20:45:59,076 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-12-18 20:45:59,076 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-12-18 20:45:59,076 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-12-18 20:45:59,076 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 6e9221de91e231efa38b63f264828813e89f68c8ac306a629b3513c0e7bf1ed0 [2021-12-18 20:45:59,315 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-12-18 20:45:59,337 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-12-18 20:45:59,339 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-12-18 20:45:59,340 INFO L271 PluginConnector]: Initializing CDTParser... [2021-12-18 20:45:59,341 INFO L275 PluginConnector]: CDTParser initialized [2021-12-18 20:45:59,342 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/memsafety-ext2/length_test03-1.i [2021-12-18 20:45:59,400 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/cc48091f0/607aa5cd63884112a426acb8adda999e/FLAG330f2a34e [2021-12-18 20:45:59,833 INFO L306 CDTParser]: Found 1 translation units. [2021-12-18 20:45:59,833 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/memsafety-ext2/length_test03-1.i [2021-12-18 20:45:59,852 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/cc48091f0/607aa5cd63884112a426acb8adda999e/FLAG330f2a34e [2021-12-18 20:46:00,200 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/cc48091f0/607aa5cd63884112a426acb8adda999e [2021-12-18 20:46:00,204 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-12-18 20:46:00,206 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-12-18 20:46:00,209 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-12-18 20:46:00,209 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-12-18 20:46:00,212 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-12-18 20:46:00,213 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.12 08:46:00" (1/1) ... [2021-12-18 20:46:00,214 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@402b9ed9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.12 08:46:00, skipping insertion in model container [2021-12-18 20:46:00,214 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.12 08:46:00" (1/1) ... [2021-12-18 20:46:00,219 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-12-18 20:46:00,263 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-12-18 20:46:00,558 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-18 20:46:00,567 INFO L203 MainTranslator]: Completed pre-run [2021-12-18 20:46:00,622 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-18 20:46:00,648 INFO L208 MainTranslator]: Completed translation [2021-12-18 20:46:00,648 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.12 08:46:00 WrapperNode [2021-12-18 20:46:00,648 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-12-18 20:46:00,649 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-12-18 20:46:00,649 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-12-18 20:46:00,651 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-12-18 20:46:00,657 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.12 08:46:00" (1/1) ... [2021-12-18 20:46:00,684 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.12 08:46:00" (1/1) ... [2021-12-18 20:46:00,714 INFO L137 Inliner]: procedures = 123, calls = 38, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 98 [2021-12-18 20:46:00,715 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-12-18 20:46:00,716 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-12-18 20:46:00,716 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-12-18 20:46:00,716 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-12-18 20:46:00,722 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.12 08:46:00" (1/1) ... [2021-12-18 20:46:00,722 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.12 08:46:00" (1/1) ... [2021-12-18 20:46:00,725 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.12 08:46:00" (1/1) ... [2021-12-18 20:46:00,725 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.12 08:46:00" (1/1) ... [2021-12-18 20:46:00,741 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.12 08:46:00" (1/1) ... [2021-12-18 20:46:00,745 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.12 08:46:00" (1/1) ... [2021-12-18 20:46:00,751 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.12 08:46:00" (1/1) ... [2021-12-18 20:46:00,757 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-12-18 20:46:00,758 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-12-18 20:46:00,758 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-12-18 20:46:00,758 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-12-18 20:46:00,761 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.12 08:46:00" (1/1) ... [2021-12-18 20:46:00,767 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-18 20:46:00,776 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-18 20:46:00,787 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-12-18 20:46:00,795 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-12-18 20:46:00,817 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-12-18 20:46:00,817 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-12-18 20:46:00,817 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-12-18 20:46:00,817 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-12-18 20:46:00,818 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-12-18 20:46:00,818 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-12-18 20:46:00,818 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-12-18 20:46:00,818 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-12-18 20:46:00,818 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-12-18 20:46:00,818 INFO L130 BoogieDeclarations]: Found specification of procedure append [2021-12-18 20:46:00,818 INFO L138 BoogieDeclarations]: Found implementation of procedure append [2021-12-18 20:46:00,898 INFO L236 CfgBuilder]: Building ICFG [2021-12-18 20:46:00,899 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-12-18 20:46:01,269 INFO L277 CfgBuilder]: Performing block encoding [2021-12-18 20:46:01,279 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-12-18 20:46:01,280 INFO L301 CfgBuilder]: Removed 4 assume(true) statements. [2021-12-18 20:46:01,281 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.12 08:46:01 BoogieIcfgContainer [2021-12-18 20:46:01,282 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-12-18 20:46:01,283 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-12-18 20:46:01,283 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-12-18 20:46:01,294 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-12-18 20:46:01,294 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.12 08:46:00" (1/3) ... [2021-12-18 20:46:01,295 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@321e4e70 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.12 08:46:01, skipping insertion in model container [2021-12-18 20:46:01,295 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.12 08:46:00" (2/3) ... [2021-12-18 20:46:01,295 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@321e4e70 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.12 08:46:01, skipping insertion in model container [2021-12-18 20:46:01,296 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.12 08:46:01" (3/3) ... [2021-12-18 20:46:01,297 INFO L111 eAbstractionObserver]: Analyzing ICFG length_test03-1.i [2021-12-18 20:46:01,300 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-12-18 20:46:01,300 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 59 error locations. [2021-12-18 20:46:01,339 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-12-18 20:46:01,347 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=false, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-12-18 20:46:01,347 INFO L340 AbstractCegarLoop]: Starting to check reachability of 59 error locations. [2021-12-18 20:46:01,371 INFO L276 IsEmpty]: Start isEmpty. Operand has 128 states, 65 states have (on average 2.0615384615384613) internal successors, (134), 124 states have internal predecessors, (134), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-18 20:46:01,386 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2021-12-18 20:46:01,391 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:46:01,392 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1] [2021-12-18 20:46:01,392 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 55 more)] === [2021-12-18 20:46:01,401 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:46:01,402 INFO L85 PathProgramCache]: Analyzing trace with hash 29857, now seen corresponding path program 1 times [2021-12-18 20:46:01,409 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-18 20:46:01,410 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1686716058] [2021-12-18 20:46:01,411 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:46:01,412 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-18 20:46:01,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:46:01,561 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 20:46:01,562 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-18 20:46:01,562 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1686716058] [2021-12-18 20:46:01,563 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1686716058] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-18 20:46:01,563 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-18 20:46:01,564 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-18 20:46:01,565 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [117120428] [2021-12-18 20:46:01,566 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-18 20:46:01,571 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-18 20:46:01,571 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-18 20:46:01,600 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-18 20:46:01,601 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-18 20:46:01,604 INFO L87 Difference]: Start difference. First operand has 128 states, 65 states have (on average 2.0615384615384613) internal successors, (134), 124 states have internal predecessors, (134), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Second operand has 3 states, 2 states have (on average 1.5) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-18 20:46:01,791 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:46:01,791 INFO L93 Difference]: Finished difference Result 165 states and 174 transitions. [2021-12-18 20:46:01,793 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-18 20:46:01,794 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 3 states have internal predecessors, (3), 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 3 [2021-12-18 20:46:01,794 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:46:01,801 INFO L225 Difference]: With dead ends: 165 [2021-12-18 20:46:01,801 INFO L226 Difference]: Without dead ends: 163 [2021-12-18 20:46:01,802 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-18 20:46:01,805 INFO L933 BasicCegarLoop]: 108 mSDtfsCounter, 53 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 77 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 170 SdHoareTripleChecker+Invalid, 80 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 77 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-18 20:46:01,806 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [53 Valid, 170 Invalid, 80 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 77 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-18 20:46:01,821 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 163 states. [2021-12-18 20:46:01,837 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 163 to 124. [2021-12-18 20:46:01,839 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 64 states have (on average 1.96875) internal successors, (126), 120 states have internal predecessors, (126), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-18 20:46:01,841 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 130 transitions. [2021-12-18 20:46:01,842 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 130 transitions. Word has length 3 [2021-12-18 20:46:01,842 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:46:01,842 INFO L470 AbstractCegarLoop]: Abstraction has 124 states and 130 transitions. [2021-12-18 20:46:01,842 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-18 20:46:01,843 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 130 transitions. [2021-12-18 20:46:01,843 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2021-12-18 20:46:01,843 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:46:01,843 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1] [2021-12-18 20:46:01,843 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-12-18 20:46:01,843 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 55 more)] === [2021-12-18 20:46:01,844 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:46:01,844 INFO L85 PathProgramCache]: Analyzing trace with hash 29858, now seen corresponding path program 1 times [2021-12-18 20:46:01,844 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-18 20:46:01,845 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1897327941] [2021-12-18 20:46:01,845 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:46:01,845 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-18 20:46:01,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:46:01,891 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 20:46:01,891 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-18 20:46:01,891 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1897327941] [2021-12-18 20:46:01,892 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1897327941] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-18 20:46:01,893 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-18 20:46:01,893 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-18 20:46:01,893 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1818974108] [2021-12-18 20:46:01,893 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-18 20:46:01,894 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-18 20:46:01,895 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-18 20:46:01,896 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-18 20:46:01,896 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-18 20:46:01,897 INFO L87 Difference]: Start difference. First operand 124 states and 130 transitions. Second operand has 3 states, 2 states have (on average 1.5) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-18 20:46:02,002 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:46:02,003 INFO L93 Difference]: Finished difference Result 124 states and 131 transitions. [2021-12-18 20:46:02,004 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-18 20:46:02,004 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 3 states have internal predecessors, (3), 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 3 [2021-12-18 20:46:02,004 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:46:02,009 INFO L225 Difference]: With dead ends: 124 [2021-12-18 20:46:02,009 INFO L226 Difference]: Without dead ends: 124 [2021-12-18 20:46:02,010 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-18 20:46:02,015 INFO L933 BasicCegarLoop]: 122 mSDtfsCounter, 10 mSDsluCounter, 69 mSDsCounter, 0 mSdLazyCounter, 56 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 191 SdHoareTripleChecker+Invalid, 58 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 56 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-18 20:46:02,016 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 191 Invalid, 58 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 56 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-18 20:46:02,019 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2021-12-18 20:46:02,026 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 122. [2021-12-18 20:46:02,031 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 122 states, 64 states have (on average 1.9375) internal successors, (124), 118 states have internal predecessors, (124), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-18 20:46:02,034 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 128 transitions. [2021-12-18 20:46:02,036 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 128 transitions. Word has length 3 [2021-12-18 20:46:02,036 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:46:02,036 INFO L470 AbstractCegarLoop]: Abstraction has 122 states and 128 transitions. [2021-12-18 20:46:02,037 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-18 20:46:02,037 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 128 transitions. [2021-12-18 20:46:02,038 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-12-18 20:46:02,039 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:46:02,039 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-12-18 20:46:02,039 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-12-18 20:46:02,039 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 55 more)] === [2021-12-18 20:46:02,040 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:46:02,041 INFO L85 PathProgramCache]: Analyzing trace with hash 889446152, now seen corresponding path program 1 times [2021-12-18 20:46:02,041 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-18 20:46:02,041 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [894533232] [2021-12-18 20:46:02,042 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:46:02,042 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-18 20:46:02,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:46:02,092 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 20:46:02,093 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-18 20:46:02,093 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [894533232] [2021-12-18 20:46:02,093 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [894533232] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-18 20:46:02,094 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-18 20:46:02,094 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-18 20:46:02,094 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [266017321] [2021-12-18 20:46:02,094 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-18 20:46:02,095 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-18 20:46:02,095 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-18 20:46:02,095 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-18 20:46:02,095 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-18 20:46:02,096 INFO L87 Difference]: Start difference. First operand 122 states and 128 transitions. Second operand has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-18 20:46:02,166 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:46:02,167 INFO L93 Difference]: Finished difference Result 139 states and 147 transitions. [2021-12-18 20:46:02,167 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-18 20:46:02,167 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2021-12-18 20:46:02,167 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:46:02,168 INFO L225 Difference]: With dead ends: 139 [2021-12-18 20:46:02,168 INFO L226 Difference]: Without dead ends: 139 [2021-12-18 20:46:02,169 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-18 20:46:02,170 INFO L933 BasicCegarLoop]: 114 mSDtfsCounter, 27 mSDsluCounter, 61 mSDsCounter, 0 mSdLazyCounter, 67 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 175 SdHoareTripleChecker+Invalid, 70 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 67 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-18 20:46:02,170 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 175 Invalid, 70 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 67 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-18 20:46:02,171 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2021-12-18 20:46:02,176 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 125. [2021-12-18 20:46:02,177 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 125 states, 69 states have (on average 1.8840579710144927) internal successors, (130), 121 states have internal predecessors, (130), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-18 20:46:02,178 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 134 transitions. [2021-12-18 20:46:02,179 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 134 transitions. Word has length 6 [2021-12-18 20:46:02,179 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:46:02,179 INFO L470 AbstractCegarLoop]: Abstraction has 125 states and 134 transitions. [2021-12-18 20:46:02,179 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-18 20:46:02,179 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 134 transitions. [2021-12-18 20:46:02,180 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-12-18 20:46:02,180 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:46:02,180 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-12-18 20:46:02,180 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-12-18 20:46:02,180 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 55 more)] === [2021-12-18 20:46:02,181 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:46:02,181 INFO L85 PathProgramCache]: Analyzing trace with hash 889446153, now seen corresponding path program 1 times [2021-12-18 20:46:02,181 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-18 20:46:02,181 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [372948024] [2021-12-18 20:46:02,182 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:46:02,182 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-18 20:46:02,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:46:02,221 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 20:46:02,222 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-18 20:46:02,222 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [372948024] [2021-12-18 20:46:02,222 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [372948024] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-18 20:46:02,222 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-18 20:46:02,223 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-18 20:46:02,223 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1390143208] [2021-12-18 20:46:02,223 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-18 20:46:02,223 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-18 20:46:02,224 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-18 20:46:02,224 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-18 20:46:02,224 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-18 20:46:02,224 INFO L87 Difference]: Start difference. First operand 125 states and 134 transitions. Second operand has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-18 20:46:02,287 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:46:02,287 INFO L93 Difference]: Finished difference Result 125 states and 135 transitions. [2021-12-18 20:46:02,288 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-18 20:46:02,288 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2021-12-18 20:46:02,288 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:46:02,289 INFO L225 Difference]: With dead ends: 125 [2021-12-18 20:46:02,289 INFO L226 Difference]: Without dead ends: 125 [2021-12-18 20:46:02,290 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-18 20:46:02,291 INFO L933 BasicCegarLoop]: 123 mSDtfsCounter, 4 mSDsluCounter, 69 mSDsCounter, 0 mSdLazyCounter, 54 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 192 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 54 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-18 20:46:02,291 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4 Valid, 192 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 54 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-18 20:46:02,292 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2021-12-18 20:46:02,296 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 123. [2021-12-18 20:46:02,296 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 123 states, 69 states have (on average 1.855072463768116) internal successors, (128), 119 states have internal predecessors, (128), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-18 20:46:02,297 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 132 transitions. [2021-12-18 20:46:02,298 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 132 transitions. Word has length 6 [2021-12-18 20:46:02,298 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:46:02,298 INFO L470 AbstractCegarLoop]: Abstraction has 123 states and 132 transitions. [2021-12-18 20:46:02,298 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-18 20:46:02,298 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 132 transitions. [2021-12-18 20:46:02,299 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-12-18 20:46:02,299 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:46:02,299 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 20:46:02,299 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-12-18 20:46:02,300 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting appendErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 55 more)] === [2021-12-18 20:46:02,300 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:46:02,300 INFO L85 PathProgramCache]: Analyzing trace with hash 1036550317, now seen corresponding path program 1 times [2021-12-18 20:46:02,300 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-18 20:46:02,301 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [413535315] [2021-12-18 20:46:02,301 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:46:02,301 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-18 20:46:02,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:46:02,356 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 20:46:02,356 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-18 20:46:02,357 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [413535315] [2021-12-18 20:46:02,357 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [413535315] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-18 20:46:02,357 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-18 20:46:02,357 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-18 20:46:02,357 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1565530418] [2021-12-18 20:46:02,358 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-18 20:46:02,358 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-18 20:46:02,358 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-18 20:46:02,359 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-18 20:46:02,359 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-18 20:46:02,359 INFO L87 Difference]: Start difference. First operand 123 states and 132 transitions. Second operand has 3 states, 2 states have (on average 5.5) internal successors, (11), 3 states have internal predecessors, (11), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-18 20:46:02,418 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:46:02,418 INFO L93 Difference]: Finished difference Result 118 states and 127 transitions. [2021-12-18 20:46:02,419 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-18 20:46:02,419 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 5.5) internal successors, (11), 3 states have internal predecessors, (11), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2021-12-18 20:46:02,419 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:46:02,420 INFO L225 Difference]: With dead ends: 118 [2021-12-18 20:46:02,420 INFO L226 Difference]: Without dead ends: 118 [2021-12-18 20:46:02,420 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-18 20:46:02,421 INFO L933 BasicCegarLoop]: 93 mSDtfsCounter, 43 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 147 SdHoareTripleChecker+Invalid, 51 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-18 20:46:02,422 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [43 Valid, 147 Invalid, 51 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 47 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-18 20:46:02,422 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2021-12-18 20:46:02,426 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 118. [2021-12-18 20:46:02,426 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 118 states, 69 states have (on average 1.7826086956521738) internal successors, (123), 114 states have internal predecessors, (123), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-18 20:46:02,427 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 127 transitions. [2021-12-18 20:46:02,427 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 127 transitions. Word has length 12 [2021-12-18 20:46:02,427 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:46:02,427 INFO L470 AbstractCegarLoop]: Abstraction has 118 states and 127 transitions. [2021-12-18 20:46:02,428 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 5.5) internal successors, (11), 3 states have internal predecessors, (11), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-18 20:46:02,428 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 127 transitions. [2021-12-18 20:46:02,428 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-12-18 20:46:02,428 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:46:02,428 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 20:46:02,429 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-12-18 20:46:02,429 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting appendErr0REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 55 more)] === [2021-12-18 20:46:02,429 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:46:02,429 INFO L85 PathProgramCache]: Analyzing trace with hash 1036550316, now seen corresponding path program 1 times [2021-12-18 20:46:02,430 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-18 20:46:02,430 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1579448644] [2021-12-18 20:46:02,430 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:46:02,430 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-18 20:46:02,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:46:02,471 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 20:46:02,472 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-18 20:46:02,472 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1579448644] [2021-12-18 20:46:02,472 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1579448644] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-18 20:46:02,472 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-18 20:46:02,472 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-18 20:46:02,473 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1296105668] [2021-12-18 20:46:02,473 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-18 20:46:02,473 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-18 20:46:02,473 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-18 20:46:02,474 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-18 20:46:02,474 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-18 20:46:02,474 INFO L87 Difference]: Start difference. First operand 118 states and 127 transitions. Second operand has 3 states, 2 states have (on average 5.5) internal successors, (11), 3 states have internal predecessors, (11), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-18 20:46:02,531 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:46:02,531 INFO L93 Difference]: Finished difference Result 113 states and 122 transitions. [2021-12-18 20:46:02,531 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-18 20:46:02,532 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 5.5) internal successors, (11), 3 states have internal predecessors, (11), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2021-12-18 20:46:02,532 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:46:02,533 INFO L225 Difference]: With dead ends: 113 [2021-12-18 20:46:02,533 INFO L226 Difference]: Without dead ends: 113 [2021-12-18 20:46:02,533 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-18 20:46:02,534 INFO L933 BasicCegarLoop]: 93 mSDtfsCounter, 38 mSDsluCounter, 45 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 138 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-18 20:46:02,534 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [38 Valid, 138 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 51 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-18 20:46:02,535 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2021-12-18 20:46:02,538 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 113. [2021-12-18 20:46:02,538 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 113 states, 69 states have (on average 1.710144927536232) internal successors, (118), 109 states have internal predecessors, (118), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-18 20:46:02,539 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 122 transitions. [2021-12-18 20:46:02,539 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 122 transitions. Word has length 12 [2021-12-18 20:46:02,539 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:46:02,539 INFO L470 AbstractCegarLoop]: Abstraction has 113 states and 122 transitions. [2021-12-18 20:46:02,539 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 5.5) internal successors, (11), 3 states have internal predecessors, (11), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-18 20:46:02,540 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 122 transitions. [2021-12-18 20:46:02,540 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-12-18 20:46:02,540 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:46:02,540 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 20:46:02,541 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-12-18 20:46:02,541 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting appendErr2REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 55 more)] === [2021-12-18 20:46:02,541 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:46:02,541 INFO L85 PathProgramCache]: Analyzing trace with hash 2068288823, now seen corresponding path program 1 times [2021-12-18 20:46:02,542 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-18 20:46:02,542 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [124078779] [2021-12-18 20:46:02,542 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:46:02,542 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-18 20:46:02,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:46:02,642 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 20:46:02,642 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-18 20:46:02,642 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [124078779] [2021-12-18 20:46:02,642 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [124078779] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-18 20:46:02,643 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-18 20:46:02,643 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-12-18 20:46:02,643 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [54716884] [2021-12-18 20:46:02,643 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-18 20:46:02,643 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-12-18 20:46:02,644 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-18 20:46:02,644 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-12-18 20:46:02,644 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-12-18 20:46:02,644 INFO L87 Difference]: Start difference. First operand 113 states and 122 transitions. Second operand has 7 states, 6 states have (on average 2.0) internal successors, (12), 6 states have internal predecessors, (12), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-18 20:46:02,826 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:46:02,827 INFO L93 Difference]: Finished difference Result 223 states and 240 transitions. [2021-12-18 20:46:02,830 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-12-18 20:46:02,831 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 2.0) internal successors, (12), 6 states have internal predecessors, (12), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2021-12-18 20:46:02,831 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:46:02,832 INFO L225 Difference]: With dead ends: 223 [2021-12-18 20:46:02,832 INFO L226 Difference]: Without dead ends: 223 [2021-12-18 20:46:02,832 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2021-12-18 20:46:02,833 INFO L933 BasicCegarLoop]: 58 mSDtfsCounter, 296 mSDsluCounter, 151 mSDsCounter, 0 mSdLazyCounter, 222 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 296 SdHoareTripleChecker+Valid, 209 SdHoareTripleChecker+Invalid, 248 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 222 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-18 20:46:02,833 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [296 Valid, 209 Invalid, 248 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 222 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-18 20:46:02,834 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 223 states. [2021-12-18 20:46:02,837 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 223 to 147. [2021-12-18 20:46:02,838 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 147 states, 108 states have (on average 1.6296296296296295) internal successors, (176), 142 states have internal predecessors, (176), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-18 20:46:02,838 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 180 transitions. [2021-12-18 20:46:02,839 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 180 transitions. Word has length 13 [2021-12-18 20:46:02,839 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:46:02,839 INFO L470 AbstractCegarLoop]: Abstraction has 147 states and 180 transitions. [2021-12-18 20:46:02,839 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 2.0) internal successors, (12), 6 states have internal predecessors, (12), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-18 20:46:02,839 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 180 transitions. [2021-12-18 20:46:02,840 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-12-18 20:46:02,840 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:46:02,840 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 20:46:02,840 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-12-18 20:46:02,840 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting appendErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 55 more)] === [2021-12-18 20:46:02,841 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:46:02,841 INFO L85 PathProgramCache]: Analyzing trace with hash 2068288824, now seen corresponding path program 1 times [2021-12-18 20:46:02,841 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-18 20:46:02,842 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1919935877] [2021-12-18 20:46:02,842 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:46:02,842 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-18 20:46:02,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:46:02,965 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 20:46:02,966 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-18 20:46:02,966 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1919935877] [2021-12-18 20:46:02,966 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1919935877] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-18 20:46:02,966 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-18 20:46:02,967 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-12-18 20:46:02,967 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1202978542] [2021-12-18 20:46:02,967 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-18 20:46:02,967 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-12-18 20:46:02,968 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-18 20:46:02,968 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-12-18 20:46:02,968 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-12-18 20:46:02,968 INFO L87 Difference]: Start difference. First operand 147 states and 180 transitions. Second operand has 8 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 7 states have internal predecessors, (12), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-18 20:46:03,188 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:46:03,189 INFO L93 Difference]: Finished difference Result 204 states and 230 transitions. [2021-12-18 20:46:03,189 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-12-18 20:46:03,190 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 7 states have internal predecessors, (12), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2021-12-18 20:46:03,190 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:46:03,191 INFO L225 Difference]: With dead ends: 204 [2021-12-18 20:46:03,191 INFO L226 Difference]: Without dead ends: 204 [2021-12-18 20:46:03,192 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2021-12-18 20:46:03,193 INFO L933 BasicCegarLoop]: 67 mSDtfsCounter, 119 mSDsluCounter, 257 mSDsCounter, 0 mSdLazyCounter, 303 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 119 SdHoareTripleChecker+Valid, 324 SdHoareTripleChecker+Invalid, 317 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 303 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-18 20:46:03,193 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [119 Valid, 324 Invalid, 317 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 303 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-18 20:46:03,196 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 204 states. [2021-12-18 20:46:03,200 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 204 to 174. [2021-12-18 20:46:03,202 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 174 states, 135 states have (on average 1.6) internal successors, (216), 169 states have internal predecessors, (216), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-18 20:46:03,203 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 174 states and 220 transitions. [2021-12-18 20:46:03,204 INFO L78 Accepts]: Start accepts. Automaton has 174 states and 220 transitions. Word has length 13 [2021-12-18 20:46:03,204 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:46:03,204 INFO L470 AbstractCegarLoop]: Abstraction has 174 states and 220 transitions. [2021-12-18 20:46:03,205 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 7 states have internal predecessors, (12), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-18 20:46:03,205 INFO L276 IsEmpty]: Start isEmpty. Operand 174 states and 220 transitions. [2021-12-18 20:46:03,205 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-12-18 20:46:03,205 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:46:03,207 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 20:46:03,207 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-12-18 20:46:03,207 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting appendErr22REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 55 more)] === [2021-12-18 20:46:03,208 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:46:03,208 INFO L85 PathProgramCache]: Analyzing trace with hash -203399961, now seen corresponding path program 1 times [2021-12-18 20:46:03,208 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-18 20:46:03,209 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [608683100] [2021-12-18 20:46:03,209 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:46:03,209 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-18 20:46:03,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:46:03,436 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 20:46:03,437 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-18 20:46:03,437 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [608683100] [2021-12-18 20:46:03,437 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [608683100] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-18 20:46:03,437 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-18 20:46:03,437 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-12-18 20:46:03,438 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1470974301] [2021-12-18 20:46:03,438 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-18 20:46:03,438 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-12-18 20:46:03,438 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-18 20:46:03,439 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-12-18 20:46:03,439 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-12-18 20:46:03,439 INFO L87 Difference]: Start difference. First operand 174 states and 220 transitions. Second operand has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 8 states have internal predecessors, (21), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-18 20:46:03,659 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:46:03,659 INFO L93 Difference]: Finished difference Result 193 states and 241 transitions. [2021-12-18 20:46:03,663 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-12-18 20:46:03,663 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 8 states have internal predecessors, (21), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-12-18 20:46:03,663 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:46:03,665 INFO L225 Difference]: With dead ends: 193 [2021-12-18 20:46:03,665 INFO L226 Difference]: Without dead ends: 193 [2021-12-18 20:46:03,665 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2021-12-18 20:46:03,666 INFO L933 BasicCegarLoop]: 93 mSDtfsCounter, 22 mSDsluCounter, 499 mSDsCounter, 0 mSdLazyCounter, 267 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 592 SdHoareTripleChecker+Invalid, 276 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 267 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-18 20:46:03,666 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [22 Valid, 592 Invalid, 276 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 267 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-18 20:46:03,666 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 193 states. [2021-12-18 20:46:03,670 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 193 to 181. [2021-12-18 20:46:03,670 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 181 states, 141 states have (on average 1.574468085106383) internal successors, (222), 175 states have internal predecessors, (222), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-12-18 20:46:03,671 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 181 states to 181 states and 228 transitions. [2021-12-18 20:46:03,671 INFO L78 Accepts]: Start accepts. Automaton has 181 states and 228 transitions. Word has length 22 [2021-12-18 20:46:03,672 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:46:03,672 INFO L470 AbstractCegarLoop]: Abstraction has 181 states and 228 transitions. [2021-12-18 20:46:03,672 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 8 states have internal predecessors, (21), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-18 20:46:03,672 INFO L276 IsEmpty]: Start isEmpty. Operand 181 states and 228 transitions. [2021-12-18 20:46:03,673 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-12-18 20:46:03,673 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:46:03,673 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 20:46:03,673 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-12-18 20:46:03,673 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting appendErr22REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 55 more)] === [2021-12-18 20:46:03,674 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:46:03,674 INFO L85 PathProgramCache]: Analyzing trace with hash 167434122, now seen corresponding path program 1 times [2021-12-18 20:46:03,674 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-18 20:46:03,674 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1975022730] [2021-12-18 20:46:03,674 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:46:03,675 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-18 20:46:03,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:46:03,960 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 20:46:03,960 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-18 20:46:03,960 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1975022730] [2021-12-18 20:46:03,960 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1975022730] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-18 20:46:03,960 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-18 20:46:03,960 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2021-12-18 20:46:03,960 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [738548422] [2021-12-18 20:46:03,960 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-18 20:46:03,961 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-12-18 20:46:03,961 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-18 20:46:03,961 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-12-18 20:46:03,961 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2021-12-18 20:46:03,961 INFO L87 Difference]: Start difference. First operand 181 states and 228 transitions. Second operand has 11 states, 11 states have (on average 2.090909090909091) internal successors, (23), 10 states have internal predecessors, (23), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-18 20:46:04,267 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:46:04,267 INFO L93 Difference]: Finished difference Result 231 states and 290 transitions. [2021-12-18 20:46:04,267 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-12-18 20:46:04,267 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.090909090909091) internal successors, (23), 10 states have internal predecessors, (23), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-12-18 20:46:04,268 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:46:04,269 INFO L225 Difference]: With dead ends: 231 [2021-12-18 20:46:04,269 INFO L226 Difference]: Without dead ends: 231 [2021-12-18 20:46:04,269 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=43, Invalid=139, Unknown=0, NotChecked=0, Total=182 [2021-12-18 20:46:04,270 INFO L933 BasicCegarLoop]: 77 mSDtfsCounter, 105 mSDsluCounter, 467 mSDsCounter, 0 mSdLazyCounter, 382 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 107 SdHoareTripleChecker+Valid, 544 SdHoareTripleChecker+Invalid, 402 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 382 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-18 20:46:04,270 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [107 Valid, 544 Invalid, 402 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 382 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-18 20:46:04,270 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 231 states. [2021-12-18 20:46:04,273 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 231 to 156. [2021-12-18 20:46:04,274 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 156 states, 117 states have (on average 1.4957264957264957) internal successors, (175), 150 states have internal predecessors, (175), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-12-18 20:46:04,274 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 181 transitions. [2021-12-18 20:46:04,275 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 181 transitions. Word has length 24 [2021-12-18 20:46:04,275 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:46:04,275 INFO L470 AbstractCegarLoop]: Abstraction has 156 states and 181 transitions. [2021-12-18 20:46:04,275 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 2.090909090909091) internal successors, (23), 10 states have internal predecessors, (23), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-18 20:46:04,275 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 181 transitions. [2021-12-18 20:46:04,276 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-12-18 20:46:04,276 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:46:04,276 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 20:46:04,276 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-12-18 20:46:04,277 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr10REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 55 more)] === [2021-12-18 20:46:04,277 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:46:04,277 INFO L85 PathProgramCache]: Analyzing trace with hash -1246065013, now seen corresponding path program 1 times [2021-12-18 20:46:04,277 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-18 20:46:04,277 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [364512031] [2021-12-18 20:46:04,278 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:46:04,278 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-18 20:46:04,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:46:04,319 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2021-12-18 20:46:04,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:46:04,331 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 20:46:04,331 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-18 20:46:04,331 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [364512031] [2021-12-18 20:46:04,332 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [364512031] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-18 20:46:04,332 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-18 20:46:04,332 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-12-18 20:46:04,332 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [863469573] [2021-12-18 20:46:04,332 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-18 20:46:04,332 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-12-18 20:46:04,333 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-18 20:46:04,333 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-12-18 20:46:04,333 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-12-18 20:46:04,333 INFO L87 Difference]: Start difference. First operand 156 states and 181 transitions. Second operand has 4 states, 4 states have (on average 7.25) internal successors, (29), 3 states have internal predecessors, (29), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-18 20:46:04,413 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:46:04,414 INFO L93 Difference]: Finished difference Result 148 states and 159 transitions. [2021-12-18 20:46:04,414 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-12-18 20:46:04,414 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 7.25) internal successors, (29), 3 states have internal predecessors, (29), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 31 [2021-12-18 20:46:04,415 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:46:04,416 INFO L225 Difference]: With dead ends: 148 [2021-12-18 20:46:04,416 INFO L226 Difference]: Without dead ends: 148 [2021-12-18 20:46:04,416 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-12-18 20:46:04,417 INFO L933 BasicCegarLoop]: 103 mSDtfsCounter, 12 mSDsluCounter, 141 mSDsCounter, 0 mSdLazyCounter, 75 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 244 SdHoareTripleChecker+Invalid, 79 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 75 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-18 20:46:04,417 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 244 Invalid, 79 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 75 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-18 20:46:04,417 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2021-12-18 20:46:04,420 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 135. [2021-12-18 20:46:04,420 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 135 states, 96 states have (on average 1.4479166666666667) internal successors, (139), 129 states have internal predecessors, (139), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-12-18 20:46:04,421 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 145 transitions. [2021-12-18 20:46:04,421 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 145 transitions. Word has length 31 [2021-12-18 20:46:04,421 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:46:04,421 INFO L470 AbstractCegarLoop]: Abstraction has 135 states and 145 transitions. [2021-12-18 20:46:04,421 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 7.25) internal successors, (29), 3 states have internal predecessors, (29), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-18 20:46:04,421 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 145 transitions. [2021-12-18 20:46:04,422 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-12-18 20:46:04,422 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:46:04,422 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 20:46:04,423 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-12-18 20:46:04,423 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting appendErr2REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 55 more)] === [2021-12-18 20:46:04,423 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:46:04,423 INFO L85 PathProgramCache]: Analyzing trace with hash 32633587, now seen corresponding path program 1 times [2021-12-18 20:46:04,423 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-18 20:46:04,423 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1187584500] [2021-12-18 20:46:04,424 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:46:04,424 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-18 20:46:04,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:46:04,522 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2021-12-18 20:46:04,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:46:04,588 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 20:46:04,589 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-18 20:46:04,589 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1187584500] [2021-12-18 20:46:04,589 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1187584500] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 20:46:04,589 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1639272739] [2021-12-18 20:46:04,589 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:46:04,589 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-18 20:46:04,589 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-18 20:46:04,591 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-18 20:46:04,619 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-12-18 20:46:04,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:46:04,767 INFO L263 TraceCheckSpWp]: Trace formula consists of 315 conjuncts, 18 conjunts are in the unsatisfiable core [2021-12-18 20:46:04,772 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:46:04,864 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:46:05,113 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-12-18 20:46:05,113 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 17 treesize of output 21 [2021-12-18 20:46:05,150 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-12-18 20:46:05,151 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 12 treesize of output 14 [2021-12-18 20:46:05,162 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 20:46:05,162 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 20:46:05,261 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1639272739] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 20:46:05,261 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-18 20:46:05,261 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 6] total 11 [2021-12-18 20:46:05,261 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1929846949] [2021-12-18 20:46:05,261 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-18 20:46:05,262 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-12-18 20:46:05,262 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-18 20:46:05,262 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-12-18 20:46:05,263 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=125, Unknown=0, NotChecked=0, Total=156 [2021-12-18 20:46:05,263 INFO L87 Difference]: Start difference. First operand 135 states and 145 transitions. Second operand has 12 states, 11 states have (on average 4.363636363636363) internal successors, (48), 9 states have internal predecessors, (48), 1 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-12-18 20:46:05,477 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:46:05,478 INFO L93 Difference]: Finished difference Result 172 states and 183 transitions. [2021-12-18 20:46:05,478 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-12-18 20:46:05,478 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 4.363636363636363) internal successors, (48), 9 states have internal predecessors, (48), 1 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 32 [2021-12-18 20:46:05,478 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:46:05,479 INFO L225 Difference]: With dead ends: 172 [2021-12-18 20:46:05,479 INFO L226 Difference]: Without dead ends: 172 [2021-12-18 20:46:05,480 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 38 SyntacticMatches, 3 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=50, Invalid=190, Unknown=0, NotChecked=0, Total=240 [2021-12-18 20:46:05,480 INFO L933 BasicCegarLoop]: 60 mSDtfsCounter, 192 mSDsluCounter, 280 mSDsCounter, 0 mSdLazyCounter, 317 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 192 SdHoareTripleChecker+Valid, 340 SdHoareTripleChecker+Invalid, 334 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 317 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 2 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-18 20:46:05,481 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [192 Valid, 340 Invalid, 334 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 317 Invalid, 0 Unknown, 2 Unchecked, 0.2s Time] [2021-12-18 20:46:05,481 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2021-12-18 20:46:05,483 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 135. [2021-12-18 20:46:05,484 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 135 states, 98 states have (on average 1.4387755102040816) internal successors, (141), 129 states have internal predecessors, (141), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-12-18 20:46:05,484 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 147 transitions. [2021-12-18 20:46:05,484 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 147 transitions. Word has length 32 [2021-12-18 20:46:05,485 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:46:05,485 INFO L470 AbstractCegarLoop]: Abstraction has 135 states and 147 transitions. [2021-12-18 20:46:05,485 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 4.363636363636363) internal successors, (48), 9 states have internal predecessors, (48), 1 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-12-18 20:46:05,485 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 147 transitions. [2021-12-18 20:46:05,486 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-12-18 20:46:05,486 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:46:05,486 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 20:46:05,515 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-12-18 20:46:05,699 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-12-18 20:46:05,699 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting appendErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 55 more)] === [2021-12-18 20:46:05,700 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:46:05,700 INFO L85 PathProgramCache]: Analyzing trace with hash 32633588, now seen corresponding path program 1 times [2021-12-18 20:46:05,700 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-18 20:46:05,700 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1091201293] [2021-12-18 20:46:05,700 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:46:05,700 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-18 20:46:05,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:46:05,856 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2021-12-18 20:46:05,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:46:05,912 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 20:46:05,913 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-18 20:46:05,913 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1091201293] [2021-12-18 20:46:05,913 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1091201293] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 20:46:05,913 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [271363578] [2021-12-18 20:46:05,913 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:46:05,914 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-18 20:46:05,914 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-18 20:46:05,915 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-18 20:46:05,916 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-12-18 20:46:06,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:46:06,043 INFO L263 TraceCheckSpWp]: Trace formula consists of 315 conjuncts, 33 conjunts are in the unsatisfiable core [2021-12-18 20:46:06,046 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:46:06,093 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:46:06,099 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:46:06,338 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:46:06,340 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-18 20:46:06,353 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-12-18 20:46:06,353 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 17 treesize of output 21 [2021-12-18 20:46:06,486 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:46:06,487 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-18 20:46:06,499 INFO L354 Elim1Store]: treesize reduction 8, result has 52.9 percent of original size [2021-12-18 20:46:06,500 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 2 case distinctions, treesize of input 16 treesize of output 18 [2021-12-18 20:46:06,507 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 20:46:06,508 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 20:46:06,825 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [271363578] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 20:46:06,826 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-18 20:46:06,826 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 7] total 15 [2021-12-18 20:46:06,826 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1589301296] [2021-12-18 20:46:06,826 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-18 20:46:06,826 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-12-18 20:46:06,827 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-18 20:46:06,827 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-12-18 20:46:06,827 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=321, Unknown=0, NotChecked=0, Total=380 [2021-12-18 20:46:06,827 INFO L87 Difference]: Start difference. First operand 135 states and 147 transitions. Second operand has 16 states, 15 states have (on average 3.6) internal successors, (54), 12 states have internal predecessors, (54), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-18 20:46:07,107 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:46:07,107 INFO L93 Difference]: Finished difference Result 198 states and 214 transitions. [2021-12-18 20:46:07,108 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-12-18 20:46:07,108 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 3.6) internal successors, (54), 12 states have internal predecessors, (54), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 32 [2021-12-18 20:46:07,108 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:46:07,109 INFO L225 Difference]: With dead ends: 198 [2021-12-18 20:46:07,109 INFO L226 Difference]: Without dead ends: 198 [2021-12-18 20:46:07,110 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 95 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=73, Invalid=389, Unknown=0, NotChecked=0, Total=462 [2021-12-18 20:46:07,110 INFO L933 BasicCegarLoop]: 87 mSDtfsCounter, 82 mSDsluCounter, 477 mSDsCounter, 0 mSdLazyCounter, 388 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 82 SdHoareTripleChecker+Valid, 564 SdHoareTripleChecker+Invalid, 538 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 388 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 129 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-18 20:46:07,111 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [82 Valid, 564 Invalid, 538 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 388 Invalid, 0 Unknown, 129 Unchecked, 0.2s Time] [2021-12-18 20:46:07,111 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 198 states. [2021-12-18 20:46:07,114 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 198 to 166. [2021-12-18 20:46:07,114 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 166 states, 125 states have (on average 1.384) internal successors, (173), 158 states have internal predecessors, (173), 5 states have call successors, (5), 4 states have call predecessors, (5), 4 states have return successors, (7), 3 states have call predecessors, (7), 5 states have call successors, (7) [2021-12-18 20:46:07,115 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 185 transitions. [2021-12-18 20:46:07,115 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 185 transitions. Word has length 32 [2021-12-18 20:46:07,115 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:46:07,115 INFO L470 AbstractCegarLoop]: Abstraction has 166 states and 185 transitions. [2021-12-18 20:46:07,116 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 15 states have (on average 3.6) internal successors, (54), 12 states have internal predecessors, (54), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-18 20:46:07,116 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 185 transitions. [2021-12-18 20:46:07,116 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-12-18 20:46:07,117 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:46:07,117 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 20:46:07,143 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-12-18 20:46:07,327 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-12-18 20:46:07,328 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting appendErr22REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 55 more)] === [2021-12-18 20:46:07,328 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:46:07,328 INFO L85 PathProgramCache]: Analyzing trace with hash 1429441119, now seen corresponding path program 1 times [2021-12-18 20:46:07,328 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-18 20:46:07,328 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [207355854] [2021-12-18 20:46:07,328 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:46:07,328 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-18 20:46:07,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:46:07,498 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2021-12-18 20:46:07,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:46:07,662 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 20:46:07,662 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-18 20:46:07,662 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [207355854] [2021-12-18 20:46:07,663 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [207355854] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 20:46:07,663 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [460010982] [2021-12-18 20:46:07,663 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:46:07,663 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-18 20:46:07,663 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-18 20:46:07,664 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-18 20:46:07,686 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-12-18 20:46:07,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:46:07,822 INFO L263 TraceCheckSpWp]: Trace formula consists of 369 conjuncts, 52 conjunts are in the unsatisfiable core [2021-12-18 20:46:07,827 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:46:07,835 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:46:07,873 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-12-18 20:46:07,874 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 17 treesize of output 21 [2021-12-18 20:46:08,121 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-12-18 20:46:08,177 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-18 20:46:08,177 INFO L388 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 16 treesize of output 22 [2021-12-18 20:46:08,187 INFO L388 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 7 treesize of output 3 [2021-12-18 20:46:08,273 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-18 20:46:08,273 INFO L388 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 20 treesize of output 26 [2021-12-18 20:46:08,400 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-18 20:46:08,407 INFO L354 Elim1Store]: treesize reduction 20, result has 33.3 percent of original size [2021-12-18 20:46:08,407 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 29 treesize of output 28 [2021-12-18 20:46:08,593 INFO L354 Elim1Store]: treesize reduction 54, result has 36.5 percent of original size [2021-12-18 20:46:08,593 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 28 treesize of output 45 [2021-12-18 20:46:08,661 INFO L388 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 38 treesize of output 36 [2021-12-18 20:46:08,857 INFO L388 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 38 treesize of output 36 [2021-12-18 20:46:08,950 INFO L388 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 38 treesize of output 36 [2021-12-18 20:46:09,012 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-18 20:46:09,012 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 13 [2021-12-18 20:46:09,039 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 20:46:09,040 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 20:46:09,325 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-18 20:46:09,325 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 33 treesize of output 34 [2021-12-18 20:46:09,334 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-18 20:46:09,334 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 170 treesize of output 122 [2021-12-18 20:46:09,341 INFO L388 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 44 treesize of output 40 [2021-12-18 20:46:09,346 INFO L388 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 82 treesize of output 74 [2021-12-18 20:46:10,014 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [460010982] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 20:46:10,014 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-18 20:46:10,014 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 13] total 27 [2021-12-18 20:46:10,014 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [870823751] [2021-12-18 20:46:10,014 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-18 20:46:10,015 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-12-18 20:46:10,015 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-18 20:46:10,015 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-12-18 20:46:10,016 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=938, Unknown=14, NotChecked=0, Total=1056 [2021-12-18 20:46:10,016 INFO L87 Difference]: Start difference. First operand 166 states and 185 transitions. Second operand has 28 states, 27 states have (on average 2.7037037037037037) internal successors, (73), 24 states have internal predecessors, (73), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-18 20:46:10,599 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:46:10,599 INFO L93 Difference]: Finished difference Result 182 states and 204 transitions. [2021-12-18 20:46:10,600 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-12-18 20:46:10,600 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 27 states have (on average 2.7037037037037037) internal successors, (73), 24 states have internal predecessors, (73), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 40 [2021-12-18 20:46:10,600 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:46:10,601 INFO L225 Difference]: With dead ends: 182 [2021-12-18 20:46:10,601 INFO L226 Difference]: Without dead ends: 182 [2021-12-18 20:46:10,602 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 40 SyntacticMatches, 7 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 446 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=171, Invalid=1375, Unknown=14, NotChecked=0, Total=1560 [2021-12-18 20:46:10,602 INFO L933 BasicCegarLoop]: 86 mSDtfsCounter, 106 mSDsluCounter, 991 mSDsCounter, 0 mSdLazyCounter, 545 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 106 SdHoareTripleChecker+Valid, 1077 SdHoareTripleChecker+Invalid, 740 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 545 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 186 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-18 20:46:10,603 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [106 Valid, 1077 Invalid, 740 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 545 Invalid, 0 Unknown, 186 Unchecked, 0.3s Time] [2021-12-18 20:46:10,603 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 182 states. [2021-12-18 20:46:10,606 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 182 to 178. [2021-12-18 20:46:10,606 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 178 states, 137 states have (on average 1.3722627737226278) internal successors, (188), 169 states have internal predecessors, (188), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (7), 3 states have call predecessors, (7), 5 states have call successors, (7) [2021-12-18 20:46:10,607 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 178 states to 178 states and 200 transitions. [2021-12-18 20:46:10,607 INFO L78 Accepts]: Start accepts. Automaton has 178 states and 200 transitions. Word has length 40 [2021-12-18 20:46:10,607 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:46:10,607 INFO L470 AbstractCegarLoop]: Abstraction has 178 states and 200 transitions. [2021-12-18 20:46:10,607 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 27 states have (on average 2.7037037037037037) internal successors, (73), 24 states have internal predecessors, (73), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-18 20:46:10,607 INFO L276 IsEmpty]: Start isEmpty. Operand 178 states and 200 transitions. [2021-12-18 20:46:10,608 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-12-18 20:46:10,608 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:46:10,608 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 20:46:10,634 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-12-18 20:46:10,827 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-18 20:46:10,827 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting appendErr23REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 55 more)] === [2021-12-18 20:46:10,828 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:46:10,828 INFO L85 PathProgramCache]: Analyzing trace with hash 1429441120, now seen corresponding path program 1 times [2021-12-18 20:46:10,828 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-18 20:46:10,828 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2106103966] [2021-12-18 20:46:10,828 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:46:10,828 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-18 20:46:10,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:46:11,043 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2021-12-18 20:46:11,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:46:11,232 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 20:46:11,232 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-18 20:46:11,232 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2106103966] [2021-12-18 20:46:11,233 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2106103966] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 20:46:11,233 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [185675903] [2021-12-18 20:46:11,233 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:46:11,233 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-18 20:46:11,233 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-18 20:46:11,234 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-18 20:46:11,235 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-12-18 20:46:11,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:46:11,361 INFO L263 TraceCheckSpWp]: Trace formula consists of 369 conjuncts, 71 conjunts are in the unsatisfiable core [2021-12-18 20:46:11,365 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:46:11,372 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:46:11,409 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-12-18 20:46:11,410 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 17 treesize of output 21 [2021-12-18 20:46:11,455 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:46:11,696 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-12-18 20:46:11,699 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-12-18 20:46:11,767 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-18 20:46:11,768 INFO L388 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 16 treesize of output 22 [2021-12-18 20:46:11,783 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-18 20:46:11,783 INFO L388 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 16 treesize of output 22 [2021-12-18 20:46:11,791 INFO L388 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 7 treesize of output 3 [2021-12-18 20:46:11,805 INFO L388 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 7 treesize of output 3 [2021-12-18 20:46:11,920 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-18 20:46:11,920 INFO L388 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 20 treesize of output 26 [2021-12-18 20:46:11,933 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-18 20:46:11,934 INFO L388 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 20 treesize of output 26 [2021-12-18 20:46:12,152 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-18 20:46:12,159 INFO L354 Elim1Store]: treesize reduction 20, result has 33.3 percent of original size [2021-12-18 20:46:12,159 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 29 treesize of output 28 [2021-12-18 20:46:12,347 INFO L354 Elim1Store]: treesize reduction 8, result has 65.2 percent of original size [2021-12-18 20:46:12,348 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 2 case distinctions, treesize of input 22 treesize of output 24 [2021-12-18 20:46:12,352 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 20 [2021-12-18 20:46:12,409 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 18 [2021-12-18 20:46:12,413 INFO L388 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 38 treesize of output 36 [2021-12-18 20:46:12,574 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 18 [2021-12-18 20:46:12,580 INFO L388 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 38 treesize of output 36 [2021-12-18 20:46:12,655 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 18 [2021-12-18 20:46:12,668 INFO L388 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 38 treesize of output 36 [2021-12-18 20:46:12,723 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-18 20:46:12,724 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 13 [2021-12-18 20:46:12,728 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-18 20:46:12,728 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 7 [2021-12-18 20:46:12,733 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 20:46:12,734 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 20:46:12,799 WARN L838 $PredicateComparison]: unable to prove that (and (forall ((v_ArrVal_1131 (Array Int Int)) (v_ArrVal_1130 (Array Int Int))) (let ((.cse0 (+ c_append_~head.offset 4))) (<= (+ (select (select (store |c_#memory_$Pointer$.offset| c_append_~node~0.base v_ArrVal_1130) c_append_~head.base) .cse0) 9) (select |c_#length| (select (select (store |c_#memory_$Pointer$.base| c_append_~node~0.base v_ArrVal_1131) c_append_~head.base) .cse0))))) (forall ((v_ArrVal_1130 (Array Int Int))) (<= 0 (+ (select (select (store |c_#memory_$Pointer$.offset| c_append_~node~0.base v_ArrVal_1130) c_append_~head.base) (+ c_append_~head.offset 4)) 5)))) is different from false [2021-12-18 20:46:15,191 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-18 20:46:15,191 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 85 treesize of output 86 [2021-12-18 20:46:15,196 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-18 20:46:15,203 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-18 20:46:15,204 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 129 treesize of output 129 [2021-12-18 20:46:15,212 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-18 20:46:15,212 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 125 treesize of output 105 [2021-12-18 20:46:15,216 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-18 20:46:15,224 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-18 20:46:15,225 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 164 treesize of output 152 [2021-12-18 20:46:15,237 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-18 20:46:15,238 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 376 treesize of output 372 [2021-12-18 20:46:15,247 INFO L388 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 372 treesize of output 320 [2021-12-18 20:46:15,264 INFO L388 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 320 treesize of output 284 [2021-12-18 20:46:16,733 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [185675903] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 20:46:16,733 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-18 20:46:16,733 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 25 [2021-12-18 20:46:16,733 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [152282405] [2021-12-18 20:46:16,733 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-18 20:46:16,734 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-12-18 20:46:16,734 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-18 20:46:16,734 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-12-18 20:46:16,735 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=834, Unknown=5, NotChecked=58, Total=992 [2021-12-18 20:46:16,735 INFO L87 Difference]: Start difference. First operand 178 states and 200 transitions. Second operand has 26 states, 25 states have (on average 2.88) internal successors, (72), 22 states have internal predecessors, (72), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-18 20:46:17,536 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:46:17,536 INFO L93 Difference]: Finished difference Result 183 states and 204 transitions. [2021-12-18 20:46:17,539 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-12-18 20:46:17,539 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 2.88) internal successors, (72), 22 states have internal predecessors, (72), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 40 [2021-12-18 20:46:17,540 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:46:17,540 INFO L225 Difference]: With dead ends: 183 [2021-12-18 20:46:17,541 INFO L226 Difference]: Without dead ends: 183 [2021-12-18 20:46:17,541 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 41 SyntacticMatches, 5 SemanticMatches, 38 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 378 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=166, Invalid=1315, Unknown=5, NotChecked=74, Total=1560 [2021-12-18 20:46:17,542 INFO L933 BasicCegarLoop]: 87 mSDtfsCounter, 88 mSDsluCounter, 1023 mSDsCounter, 0 mSdLazyCounter, 603 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 88 SdHoareTripleChecker+Valid, 1110 SdHoareTripleChecker+Invalid, 850 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 603 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 240 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-18 20:46:17,542 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [88 Valid, 1110 Invalid, 850 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 603 Invalid, 0 Unknown, 240 Unchecked, 0.3s Time] [2021-12-18 20:46:17,543 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 183 states. [2021-12-18 20:46:17,545 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 183 to 178. [2021-12-18 20:46:17,546 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 178 states, 137 states have (on average 1.364963503649635) internal successors, (187), 169 states have internal predecessors, (187), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (7), 3 states have call predecessors, (7), 5 states have call successors, (7) [2021-12-18 20:46:17,546 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 178 states to 178 states and 199 transitions. [2021-12-18 20:46:17,547 INFO L78 Accepts]: Start accepts. Automaton has 178 states and 199 transitions. Word has length 40 [2021-12-18 20:46:17,547 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:46:17,547 INFO L470 AbstractCegarLoop]: Abstraction has 178 states and 199 transitions. [2021-12-18 20:46:17,547 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 25 states have (on average 2.88) internal successors, (72), 22 states have internal predecessors, (72), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-18 20:46:17,547 INFO L276 IsEmpty]: Start isEmpty. Operand 178 states and 199 transitions. [2021-12-18 20:46:17,548 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-12-18 20:46:17,548 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:46:17,548 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 20:46:17,571 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-12-18 20:46:17,763 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-12-18 20:46:17,763 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting appendErr22REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 55 more)] === [2021-12-18 20:46:17,764 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:46:17,764 INFO L85 PathProgramCache]: Analyzing trace with hash 1618850475, now seen corresponding path program 1 times [2021-12-18 20:46:17,764 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-18 20:46:17,764 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1265715055] [2021-12-18 20:46:17,764 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:46:17,764 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-18 20:46:17,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:46:17,956 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2021-12-18 20:46:17,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:46:19,160 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 20:46:19,161 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-18 20:46:19,161 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1265715055] [2021-12-18 20:46:19,161 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1265715055] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 20:46:19,161 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [216796844] [2021-12-18 20:46:19,161 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:46:19,161 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-18 20:46:19,161 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-18 20:46:19,162 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-18 20:46:19,163 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-12-18 20:46:19,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:46:19,297 INFO L263 TraceCheckSpWp]: Trace formula consists of 375 conjuncts, 76 conjunts are in the unsatisfiable core [2021-12-18 20:46:19,306 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:46:19,311 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:46:19,332 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-12-18 20:46:19,333 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 17 treesize of output 21 [2021-12-18 20:46:19,378 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-12-18 20:46:19,383 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-12-18 20:46:19,422 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:46:19,423 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 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 [2021-12-18 20:46:19,436 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:46:19,437 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 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 [2021-12-18 20:46:20,470 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:46:20,473 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:46:20,474 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:46:20,475 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 28 [2021-12-18 20:46:20,480 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:46:20,484 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:46:20,485 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:46:20,486 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 28 [2021-12-18 20:46:20,508 INFO L354 Elim1Store]: treesize reduction 40, result has 32.2 percent of original size [2021-12-18 20:46:20,508 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 24 treesize of output 28 [2021-12-18 20:46:20,764 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-12-18 20:46:20,764 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 22 treesize of output 33 [2021-12-18 20:46:20,837 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 21 [2021-12-18 20:46:20,842 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 21 [2021-12-18 20:46:20,904 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 10 [2021-12-18 20:46:20,908 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 10 [2021-12-18 20:46:20,935 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 20:46:20,936 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 20:46:26,313 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [216796844] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 20:46:26,313 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-18 20:46:26,313 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 19] total 28 [2021-12-18 20:46:26,314 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2061729624] [2021-12-18 20:46:26,314 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-18 20:46:26,314 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-12-18 20:46:26,314 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-18 20:46:26,314 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-12-18 20:46:26,315 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=918, Unknown=13, NotChecked=0, Total=1056 [2021-12-18 20:46:26,315 INFO L87 Difference]: Start difference. First operand 178 states and 199 transitions. Second operand has 28 states, 28 states have (on average 2.0357142857142856) internal successors, (57), 24 states have internal predecessors, (57), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-18 20:46:26,906 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:46:26,906 INFO L93 Difference]: Finished difference Result 226 states and 250 transitions. [2021-12-18 20:46:26,907 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-12-18 20:46:26,907 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 2.0357142857142856) internal successors, (57), 24 states have internal predecessors, (57), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 41 [2021-12-18 20:46:26,907 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:46:26,908 INFO L225 Difference]: With dead ends: 226 [2021-12-18 20:46:26,908 INFO L226 Difference]: Without dead ends: 226 [2021-12-18 20:46:26,909 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 40 SyntacticMatches, 6 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 385 ImplicationChecksByTransitivity, 6.4s TimeCoverageRelationStatistics Valid=145, Invalid=1099, Unknown=16, NotChecked=0, Total=1260 [2021-12-18 20:46:26,909 INFO L933 BasicCegarLoop]: 85 mSDtfsCounter, 57 mSDsluCounter, 729 mSDsCounter, 0 mSdLazyCounter, 466 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 57 SdHoareTripleChecker+Valid, 814 SdHoareTripleChecker+Invalid, 560 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 466 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 79 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-12-18 20:46:26,909 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [57 Valid, 814 Invalid, 560 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 466 Invalid, 0 Unknown, 79 Unchecked, 0.5s Time] [2021-12-18 20:46:26,910 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 226 states. [2021-12-18 20:46:26,914 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 226 to 194. [2021-12-18 20:46:26,914 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 194 states, 151 states have (on average 1.3377483443708609) internal successors, (202), 183 states have internal predecessors, (202), 6 states have call successors, (6), 6 states have call predecessors, (6), 5 states have return successors, (8), 4 states have call predecessors, (8), 6 states have call successors, (8) [2021-12-18 20:46:26,915 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 194 states to 194 states and 216 transitions. [2021-12-18 20:46:26,915 INFO L78 Accepts]: Start accepts. Automaton has 194 states and 216 transitions. Word has length 41 [2021-12-18 20:46:26,915 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:46:26,915 INFO L470 AbstractCegarLoop]: Abstraction has 194 states and 216 transitions. [2021-12-18 20:46:26,916 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 2.0357142857142856) internal successors, (57), 24 states have internal predecessors, (57), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-18 20:46:26,916 INFO L276 IsEmpty]: Start isEmpty. Operand 194 states and 216 transitions. [2021-12-18 20:46:26,916 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-12-18 20:46:26,916 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:46:26,917 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 20:46:26,939 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2021-12-18 20:46:27,131 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-12-18 20:46:27,131 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting appendErr22REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 55 more)] === [2021-12-18 20:46:27,132 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:46:27,132 INFO L85 PathProgramCache]: Analyzing trace with hash 1664648962, now seen corresponding path program 1 times [2021-12-18 20:46:27,132 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-18 20:46:27,132 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2029359816] [2021-12-18 20:46:27,132 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:46:27,132 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-18 20:46:27,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:46:27,303 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2021-12-18 20:46:27,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:46:27,487 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 3 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 20:46:27,488 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-18 20:46:27,488 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2029359816] [2021-12-18 20:46:27,488 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2029359816] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 20:46:27,488 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1734986990] [2021-12-18 20:46:27,488 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:46:27,489 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-18 20:46:27,489 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-18 20:46:27,496 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-18 20:46:27,497 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-12-18 20:46:27,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:46:27,633 INFO L263 TraceCheckSpWp]: Trace formula consists of 378 conjuncts, 52 conjunts are in the unsatisfiable core [2021-12-18 20:46:27,637 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:46:27,643 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:46:27,682 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-12-18 20:46:27,683 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 17 treesize of output 21 [2021-12-18 20:46:27,860 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-12-18 20:46:27,900 INFO L354 Elim1Store]: treesize reduction 21, result has 25.0 percent of original size [2021-12-18 20:46:27,900 INFO L388 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 1 case distinctions, treesize of input 21 treesize of output 20 [2021-12-18 20:46:27,938 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-18 20:46:27,939 INFO L388 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 1 case distinctions, treesize of input 23 treesize of output 27 [2021-12-18 20:46:27,948 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:46:27,948 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 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 13 treesize of output 7 [2021-12-18 20:46:27,995 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-18 20:46:27,995 INFO L388 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 1 case distinctions, treesize of input 28 treesize of output 32 [2021-12-18 20:46:28,084 INFO L354 Elim1Store]: treesize reduction 4, result has 66.7 percent of original size [2021-12-18 20:46:28,084 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 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 15 treesize of output 15 [2021-12-18 20:46:28,178 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-18 20:46:28,178 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2021-12-18 20:46:28,215 INFO L388 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 36 treesize of output 32 [2021-12-18 20:46:28,260 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-18 20:46:28,261 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 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 35 treesize of output 15 [2021-12-18 20:46:28,283 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 5 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 20:46:28,284 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 20:46:28,316 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_1590 (Array Int Int))) (not (= (select (select (store |c_#memory_$Pointer$.base| c_append_~node~0.base v_ArrVal_1590) c_append_~head.base) c_append_~head.offset) 0))) is different from false [2021-12-18 20:46:28,327 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_append_~node~0.base_42 Int) (v_ArrVal_1590 (Array Int Int))) (or (not (= (select (select (store |c_#memory_$Pointer$.base| v_append_~node~0.base_42 v_ArrVal_1590) |c_append_#in~head.base|) |c_append_#in~head.offset|) 0)) (not (= 0 (select |c_#valid| v_append_~node~0.base_42))))) is different from false [2021-12-18 20:46:28,338 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_append_~node~0.base_42 Int) (v_ArrVal_1590 (Array Int Int))) (or (not (= (select (select (store |c_#memory_$Pointer$.base| v_append_~node~0.base_42 v_ArrVal_1590) |c_ULTIMATE.start_main_~list~0#1.base|) |c_ULTIMATE.start_main_~list~0#1.offset|) 0)) (not (= 0 (select |c_#valid| v_append_~node~0.base_42))))) is different from false [2021-12-18 20:46:28,440 INFO L354 Elim1Store]: treesize reduction 21, result has 47.5 percent of original size [2021-12-18 20:46:28,440 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 33 [2021-12-18 20:46:28,443 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-18 20:46:28,448 INFO L354 Elim1Store]: treesize reduction 9, result has 10.0 percent of original size [2021-12-18 20:46:28,448 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 72 treesize of output 34 [2021-12-18 20:46:28,452 INFO L388 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 20 treesize of output 18 [2021-12-18 20:46:28,458 INFO L354 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2021-12-18 20:46:28,459 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 12 [2021-12-18 20:46:28,663 INFO L354 Elim1Store]: treesize reduction 21, result has 47.5 percent of original size [2021-12-18 20:46:28,664 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 33 [2021-12-18 20:46:28,688 INFO L354 Elim1Store]: treesize reduction 10, result has 71.4 percent of original size [2021-12-18 20:46:28,688 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 75 treesize of output 85 [2021-12-18 20:46:28,693 INFO L388 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 52 treesize of output 48 [2021-12-18 20:46:28,697 INFO L388 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 48 treesize of output 46 [2021-12-18 20:46:29,115 INFO L354 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2021-12-18 20:46:29,116 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 12 [2021-12-18 20:46:29,287 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 3 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 4 not checked. [2021-12-18 20:46:29,287 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1734986990] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-18 20:46:29,287 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-18 20:46:29,288 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 15] total 38 [2021-12-18 20:46:29,288 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [959150973] [2021-12-18 20:46:29,288 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-18 20:46:29,288 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2021-12-18 20:46:29,288 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-18 20:46:29,289 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-12-18 20:46:29,289 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=1030, Unknown=6, NotChecked=204, Total=1406 [2021-12-18 20:46:29,289 INFO L87 Difference]: Start difference. First operand 194 states and 216 transitions. Second operand has 38 states, 38 states have (on average 2.4210526315789473) internal successors, (92), 32 states have internal predecessors, (92), 6 states have call successors, (6), 6 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-12-18 20:46:30,384 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:46:30,384 INFO L93 Difference]: Finished difference Result 211 states and 224 transitions. [2021-12-18 20:46:30,385 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-12-18 20:46:30,385 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 2.4210526315789473) internal successors, (92), 32 states have internal predecessors, (92), 6 states have call successors, (6), 6 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 42 [2021-12-18 20:46:30,385 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:46:30,386 INFO L225 Difference]: With dead ends: 211 [2021-12-18 20:46:30,386 INFO L226 Difference]: Without dead ends: 211 [2021-12-18 20:46:30,387 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 62 SyntacticMatches, 10 SemanticMatches, 48 ConstructedPredicates, 3 IntricatePredicates, 0 DeprecatedPredicates, 622 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=365, Invalid=1788, Unknown=21, NotChecked=276, Total=2450 [2021-12-18 20:46:30,387 INFO L933 BasicCegarLoop]: 65 mSDtfsCounter, 270 mSDsluCounter, 1093 mSDsCounter, 0 mSdLazyCounter, 981 mSolverCounterSat, 87 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 270 SdHoareTripleChecker+Valid, 1158 SdHoareTripleChecker+Invalid, 1576 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 87 IncrementalHoareTripleChecker+Valid, 981 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 508 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-12-18 20:46:30,388 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [270 Valid, 1158 Invalid, 1576 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [87 Valid, 981 Invalid, 0 Unknown, 508 Unchecked, 0.5s Time] [2021-12-18 20:46:30,388 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 211 states. [2021-12-18 20:46:30,394 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 211 to 177. [2021-12-18 20:46:30,394 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 177 states, 136 states have (on average 1.3308823529411764) internal successors, (181), 168 states have internal predecessors, (181), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (5), 3 states have call predecessors, (5), 5 states have call successors, (5) [2021-12-18 20:46:30,395 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 177 states to 177 states and 191 transitions. [2021-12-18 20:46:30,395 INFO L78 Accepts]: Start accepts. Automaton has 177 states and 191 transitions. Word has length 42 [2021-12-18 20:46:30,396 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:46:30,396 INFO L470 AbstractCegarLoop]: Abstraction has 177 states and 191 transitions. [2021-12-18 20:46:30,396 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 2.4210526315789473) internal successors, (92), 32 states have internal predecessors, (92), 6 states have call successors, (6), 6 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-12-18 20:46:30,396 INFO L276 IsEmpty]: Start isEmpty. Operand 177 states and 191 transitions. [2021-12-18 20:46:30,397 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-12-18 20:46:30,397 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:46:30,397 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 20:46:30,426 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-12-18 20:46:30,617 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-12-18 20:46:30,617 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting appendErr22REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 55 more)] === [2021-12-18 20:46:30,618 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:46:30,618 INFO L85 PathProgramCache]: Analyzing trace with hash -996553650, now seen corresponding path program 1 times [2021-12-18 20:46:30,618 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-18 20:46:30,618 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1171903605] [2021-12-18 20:46:30,618 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:46:30,618 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-18 20:46:30,647 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:46:30,858 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2021-12-18 20:46:30,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:46:32,246 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 20:46:32,246 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-18 20:46:32,246 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1171903605] [2021-12-18 20:46:32,246 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1171903605] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 20:46:32,247 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1110768064] [2021-12-18 20:46:32,247 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:46:32,247 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-18 20:46:32,247 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-18 20:46:32,248 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-18 20:46:32,248 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-12-18 20:46:32,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:46:32,396 INFO L263 TraceCheckSpWp]: Trace formula consists of 384 conjuncts, 66 conjunts are in the unsatisfiable core [2021-12-18 20:46:32,400 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:46:32,403 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:46:32,437 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-12-18 20:46:32,437 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 17 treesize of output 21 [2021-12-18 20:46:32,486 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-12-18 20:46:32,491 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-12-18 20:46:33,212 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:46:33,215 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:46:33,216 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:46:33,217 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 23 [2021-12-18 20:46:33,220 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:46:33,222 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:46:33,222 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:46:33,224 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 23 [2021-12-18 20:46:33,243 INFO L354 Elim1Store]: treesize reduction 40, result has 32.2 percent of original size [2021-12-18 20:46:33,244 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 24 treesize of output 28 [2021-12-18 20:46:33,450 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-12-18 20:46:33,451 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 22 treesize of output 33 [2021-12-18 20:46:33,513 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 18 [2021-12-18 20:46:33,517 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 18 [2021-12-18 20:46:33,589 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 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 11 treesize of output 7 [2021-12-18 20:46:33,620 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-12-18 20:46:33,622 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-12-18 20:46:33,677 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 20:46:33,677 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 20:46:40,026 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1110768064] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 20:46:40,026 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-18 20:46:40,026 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 32 [2021-12-18 20:46:40,027 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1157943832] [2021-12-18 20:46:40,027 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-18 20:46:40,027 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-12-18 20:46:40,027 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-18 20:46:40,027 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-12-18 20:46:40,028 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=1263, Unknown=14, NotChecked=0, Total=1406 [2021-12-18 20:46:40,028 INFO L87 Difference]: Start difference. First operand 177 states and 191 transitions. Second operand has 32 states, 32 states have (on average 1.96875) internal successors, (63), 28 states have internal predecessors, (63), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-18 20:46:40,801 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:46:40,801 INFO L93 Difference]: Finished difference Result 196 states and 206 transitions. [2021-12-18 20:46:40,802 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-12-18 20:46:40,802 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.96875) internal successors, (63), 28 states have internal predecessors, (63), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 43 [2021-12-18 20:46:40,802 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:46:40,803 INFO L225 Difference]: With dead ends: 196 [2021-12-18 20:46:40,803 INFO L226 Difference]: Without dead ends: 196 [2021-12-18 20:46:40,804 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 45 SyntacticMatches, 4 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 581 ImplicationChecksByTransitivity, 6.4s TimeCoverageRelationStatistics Valid=204, Invalid=1942, Unknown=16, NotChecked=0, Total=2162 [2021-12-18 20:46:40,804 INFO L933 BasicCegarLoop]: 83 mSDtfsCounter, 79 mSDsluCounter, 1249 mSDsCounter, 0 mSdLazyCounter, 610 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 79 SdHoareTripleChecker+Valid, 1332 SdHoareTripleChecker+Invalid, 905 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 610 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 280 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-12-18 20:46:40,804 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [79 Valid, 1332 Invalid, 905 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 610 Invalid, 0 Unknown, 280 Unchecked, 0.4s Time] [2021-12-18 20:46:40,805 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2021-12-18 20:46:40,807 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 169. [2021-12-18 20:46:40,807 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 169 states, 128 states have (on average 1.328125) internal successors, (170), 160 states have internal predecessors, (170), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (5), 3 states have call predecessors, (5), 5 states have call successors, (5) [2021-12-18 20:46:40,808 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 169 states to 169 states and 180 transitions. [2021-12-18 20:46:40,808 INFO L78 Accepts]: Start accepts. Automaton has 169 states and 180 transitions. Word has length 43 [2021-12-18 20:46:40,808 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:46:40,808 INFO L470 AbstractCegarLoop]: Abstraction has 169 states and 180 transitions. [2021-12-18 20:46:40,809 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 1.96875) internal successors, (63), 28 states have internal predecessors, (63), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-18 20:46:40,809 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 180 transitions. [2021-12-18 20:46:40,809 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-12-18 20:46:40,809 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:46:40,809 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 20:46:40,839 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-12-18 20:46:41,019 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-18 20:46:41,020 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 55 more)] === [2021-12-18 20:46:41,020 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:46:41,020 INFO L85 PathProgramCache]: Analyzing trace with hash -1373746221, now seen corresponding path program 1 times [2021-12-18 20:46:41,020 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-18 20:46:41,020 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [5259425] [2021-12-18 20:46:41,020 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:46:41,020 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-18 20:46:41,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:46:41,064 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2021-12-18 20:46:41,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:46:41,083 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 28 [2021-12-18 20:46:41,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:46:41,104 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-12-18 20:46:41,104 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-18 20:46:41,104 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [5259425] [2021-12-18 20:46:41,105 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [5259425] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 20:46:41,105 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1428423696] [2021-12-18 20:46:41,105 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:46:41,105 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-18 20:46:41,105 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-18 20:46:41,108 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-18 20:46:41,133 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-12-18 20:46:41,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:46:41,298 INFO L263 TraceCheckSpWp]: Trace formula consists of 404 conjuncts, 3 conjunts are in the unsatisfiable core [2021-12-18 20:46:41,299 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:46:41,357 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-12-18 20:46:41,357 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 20:46:41,412 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-12-18 20:46:41,412 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1428423696] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-18 20:46:41,413 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-18 20:46:41,413 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4, 4] total 8 [2021-12-18 20:46:41,413 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [183484195] [2021-12-18 20:46:41,413 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-18 20:46:41,413 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-12-18 20:46:41,413 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-18 20:46:41,414 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-12-18 20:46:41,414 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-12-18 20:46:41,414 INFO L87 Difference]: Start difference. First operand 169 states and 180 transitions. Second operand has 8 states, 8 states have (on average 4.625) internal successors, (37), 7 states have internal predecessors, (37), 4 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-12-18 20:46:41,501 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:46:41,501 INFO L93 Difference]: Finished difference Result 214 states and 228 transitions. [2021-12-18 20:46:41,501 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-12-18 20:46:41,502 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.625) internal successors, (37), 7 states have internal predecessors, (37), 4 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 46 [2021-12-18 20:46:41,502 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:46:41,503 INFO L225 Difference]: With dead ends: 214 [2021-12-18 20:46:41,503 INFO L226 Difference]: Without dead ends: 214 [2021-12-18 20:46:41,503 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 92 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-12-18 20:46:41,503 INFO L933 BasicCegarLoop]: 103 mSDtfsCounter, 81 mSDsluCounter, 254 mSDsCounter, 0 mSdLazyCounter, 95 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 83 SdHoareTripleChecker+Valid, 357 SdHoareTripleChecker+Invalid, 115 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 95 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-18 20:46:41,504 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [83 Valid, 357 Invalid, 115 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 95 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-18 20:46:41,504 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 214 states. [2021-12-18 20:46:41,507 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 214 to 199. [2021-12-18 20:46:41,507 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 199 states, 155 states have (on average 1.367741935483871) internal successors, (212), 187 states have internal predecessors, (212), 8 states have call successors, (8), 5 states have call predecessors, (8), 4 states have return successors, (8), 6 states have call predecessors, (8), 8 states have call successors, (8) [2021-12-18 20:46:41,508 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 199 states to 199 states and 228 transitions. [2021-12-18 20:46:41,508 INFO L78 Accepts]: Start accepts. Automaton has 199 states and 228 transitions. Word has length 46 [2021-12-18 20:46:41,508 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:46:41,508 INFO L470 AbstractCegarLoop]: Abstraction has 199 states and 228 transitions. [2021-12-18 20:46:41,509 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 4.625) internal successors, (37), 7 states have internal predecessors, (37), 4 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-12-18 20:46:41,509 INFO L276 IsEmpty]: Start isEmpty. Operand 199 states and 228 transitions. [2021-12-18 20:46:41,509 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-12-18 20:46:41,509 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:46:41,509 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 20:46:41,529 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2021-12-18 20:46:41,719 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-18 20:46:41,719 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting appendErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 55 more)] === [2021-12-18 20:46:41,720 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:46:41,720 INFO L85 PathProgramCache]: Analyzing trace with hash 1475627180, now seen corresponding path program 1 times [2021-12-18 20:46:41,720 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-18 20:46:41,720 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1932223638] [2021-12-18 20:46:41,720 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:46:41,720 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-18 20:46:41,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:46:41,817 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2021-12-18 20:46:41,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:46:41,830 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 28 [2021-12-18 20:46:41,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:46:41,894 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 17 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-18 20:46:41,894 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-18 20:46:41,894 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1932223638] [2021-12-18 20:46:41,894 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1932223638] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 20:46:41,895 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1646447738] [2021-12-18 20:46:41,895 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:46:41,895 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-18 20:46:41,895 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-18 20:46:41,896 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-18 20:46:41,897 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-12-18 20:46:42,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:46:42,072 INFO L263 TraceCheckSpWp]: Trace formula consists of 458 conjuncts, 26 conjunts are in the unsatisfiable core [2021-12-18 20:46:42,074 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:46:42,224 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:46:42,225 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-18 20:46:42,229 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-18 20:46:42,230 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2021-12-18 20:46:42,235 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 19 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-18 20:46:42,236 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 20:46:42,362 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-18 20:46:42,363 INFO L388 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 17 treesize of output 13 [2021-12-18 20:46:42,453 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-18 20:46:42,454 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 29 [2021-12-18 20:46:42,555 INFO L354 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2021-12-18 20:46:42,555 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 12 [2021-12-18 20:46:42,622 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 17 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-18 20:46:42,622 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1646447738] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-18 20:46:42,622 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-18 20:46:42,622 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 8, 8] total 19 [2021-12-18 20:46:42,622 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [131079176] [2021-12-18 20:46:42,623 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-18 20:46:42,623 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-12-18 20:46:42,623 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-18 20:46:42,623 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-12-18 20:46:42,624 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=322, Unknown=0, NotChecked=0, Total=380 [2021-12-18 20:46:42,624 INFO L87 Difference]: Start difference. First operand 199 states and 228 transitions. Second operand has 20 states, 19 states have (on average 4.315789473684211) internal successors, (82), 16 states have internal predecessors, (82), 5 states have call successors, (9), 5 states have call predecessors, (9), 3 states have return successors, (5), 5 states have call predecessors, (5), 2 states have call successors, (5) [2021-12-18 20:46:43,021 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:46:43,021 INFO L93 Difference]: Finished difference Result 255 states and 279 transitions. [2021-12-18 20:46:43,021 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-12-18 20:46:43,021 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 19 states have (on average 4.315789473684211) internal successors, (82), 16 states have internal predecessors, (82), 5 states have call successors, (9), 5 states have call predecessors, (9), 3 states have return successors, (5), 5 states have call predecessors, (5), 2 states have call successors, (5) Word has length 49 [2021-12-18 20:46:43,022 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:46:43,023 INFO L225 Difference]: With dead ends: 255 [2021-12-18 20:46:43,023 INFO L226 Difference]: Without dead ends: 255 [2021-12-18 20:46:43,023 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 93 SyntacticMatches, 2 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 104 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=111, Invalid=539, Unknown=0, NotChecked=0, Total=650 [2021-12-18 20:46:43,023 INFO L933 BasicCegarLoop]: 65 mSDtfsCounter, 391 mSDsluCounter, 561 mSDsCounter, 0 mSdLazyCounter, 609 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 391 SdHoareTripleChecker+Valid, 626 SdHoareTripleChecker+Invalid, 891 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 609 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 256 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-18 20:46:43,024 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [391 Valid, 626 Invalid, 891 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 609 Invalid, 0 Unknown, 256 Unchecked, 0.3s Time] [2021-12-18 20:46:43,024 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 255 states. [2021-12-18 20:46:43,035 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 255 to 220. [2021-12-18 20:46:43,036 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 220 states, 177 states have (on average 1.3276836158192091) internal successors, (235), 207 states have internal predecessors, (235), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (8), 6 states have call predecessors, (8), 8 states have call successors, (8) [2021-12-18 20:46:43,037 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 220 states to 220 states and 251 transitions. [2021-12-18 20:46:43,037 INFO L78 Accepts]: Start accepts. Automaton has 220 states and 251 transitions. Word has length 49 [2021-12-18 20:46:43,037 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:46:43,037 INFO L470 AbstractCegarLoop]: Abstraction has 220 states and 251 transitions. [2021-12-18 20:46:43,038 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 19 states have (on average 4.315789473684211) internal successors, (82), 16 states have internal predecessors, (82), 5 states have call successors, (9), 5 states have call predecessors, (9), 3 states have return successors, (5), 5 states have call predecessors, (5), 2 states have call successors, (5) [2021-12-18 20:46:43,038 INFO L276 IsEmpty]: Start isEmpty. Operand 220 states and 251 transitions. [2021-12-18 20:46:43,038 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-12-18 20:46:43,038 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:46:43,038 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 20:46:43,059 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2021-12-18 20:46:43,251 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-18 20:46:43,251 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting appendErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 55 more)] === [2021-12-18 20:46:43,252 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:46:43,252 INFO L85 PathProgramCache]: Analyzing trace with hash -2022121576, now seen corresponding path program 1 times [2021-12-18 20:46:43,252 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-18 20:46:43,252 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [772368336] [2021-12-18 20:46:43,252 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:46:43,252 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-18 20:46:43,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:46:43,376 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2021-12-18 20:46:43,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:46:43,449 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2021-12-18 20:46:43,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:46:43,507 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 17 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-18 20:46:43,507 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-18 20:46:43,507 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [772368336] [2021-12-18 20:46:43,507 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [772368336] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 20:46:43,507 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [237695995] [2021-12-18 20:46:43,507 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:46:43,508 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-18 20:46:43,508 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-18 20:46:43,512 INFO L229 MonitoredProcess]: Starting monitored process 11 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-18 20:46:43,543 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-12-18 20:46:43,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:46:43,715 INFO L263 TraceCheckSpWp]: Trace formula consists of 467 conjuncts, 37 conjunts are in the unsatisfiable core [2021-12-18 20:46:43,717 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:46:43,746 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:46:43,750 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:46:43,920 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:46:43,922 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-18 20:46:43,931 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-12-18 20:46:43,932 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 17 treesize of output 21 [2021-12-18 20:46:44,102 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:46:44,103 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-18 20:46:44,113 INFO L354 Elim1Store]: treesize reduction 8, result has 52.9 percent of original size [2021-12-18 20:46:44,114 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 2 case distinctions, treesize of input 16 treesize of output 18 [2021-12-18 20:46:44,150 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-18 20:46:44,150 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 12 treesize of output 18 [2021-12-18 20:46:44,178 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 2 proven. 15 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-18 20:46:44,178 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 20:46:44,448 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [237695995] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 20:46:44,448 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-18 20:46:44,448 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 9] total 19 [2021-12-18 20:46:44,449 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2118693888] [2021-12-18 20:46:44,449 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-18 20:46:44,449 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-12-18 20:46:44,449 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-18 20:46:44,449 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-12-18 20:46:44,449 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=466, Unknown=0, NotChecked=0, Total=552 [2021-12-18 20:46:44,450 INFO L87 Difference]: Start difference. First operand 220 states and 251 transitions. Second operand has 20 states, 19 states have (on average 4.631578947368421) internal successors, (88), 17 states have internal predecessors, (88), 5 states have call successors, (5), 3 states have call predecessors, (5), 4 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-12-18 20:46:44,790 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:46:44,791 INFO L93 Difference]: Finished difference Result 260 states and 297 transitions. [2021-12-18 20:46:44,791 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-12-18 20:46:44,791 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 19 states have (on average 4.631578947368421) internal successors, (88), 17 states have internal predecessors, (88), 5 states have call successors, (5), 3 states have call predecessors, (5), 4 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) Word has length 52 [2021-12-18 20:46:44,792 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:46:44,793 INFO L225 Difference]: With dead ends: 260 [2021-12-18 20:46:44,793 INFO L226 Difference]: Without dead ends: 260 [2021-12-18 20:46:44,793 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 54 SyntacticMatches, 1 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 195 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=147, Invalid=723, Unknown=0, NotChecked=0, Total=870 [2021-12-18 20:46:44,794 INFO L933 BasicCegarLoop]: 69 mSDtfsCounter, 82 mSDsluCounter, 640 mSDsCounter, 0 mSdLazyCounter, 469 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 82 SdHoareTripleChecker+Valid, 709 SdHoareTripleChecker+Invalid, 656 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 469 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 177 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-18 20:46:44,794 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [82 Valid, 709 Invalid, 656 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 469 Invalid, 0 Unknown, 177 Unchecked, 0.2s Time] [2021-12-18 20:46:44,794 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 260 states. [2021-12-18 20:46:44,798 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 260 to 228. [2021-12-18 20:46:44,799 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 228 states, 184 states have (on average 1.3206521739130435) internal successors, (243), 213 states have internal predecessors, (243), 9 states have call successors, (9), 7 states have call predecessors, (9), 5 states have return successors, (9), 7 states have call predecessors, (9), 9 states have call successors, (9) [2021-12-18 20:46:44,799 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 228 states to 228 states and 261 transitions. [2021-12-18 20:46:44,800 INFO L78 Accepts]: Start accepts. Automaton has 228 states and 261 transitions. Word has length 52 [2021-12-18 20:46:44,800 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:46:44,800 INFO L470 AbstractCegarLoop]: Abstraction has 228 states and 261 transitions. [2021-12-18 20:46:44,800 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 19 states have (on average 4.631578947368421) internal successors, (88), 17 states have internal predecessors, (88), 5 states have call successors, (5), 3 states have call predecessors, (5), 4 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-12-18 20:46:44,800 INFO L276 IsEmpty]: Start isEmpty. Operand 228 states and 261 transitions. [2021-12-18 20:46:44,801 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-12-18 20:46:44,801 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:46:44,801 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 20:46:44,825 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-12-18 20:46:45,015 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2021-12-18 20:46:45,015 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting appendErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 55 more)] === [2021-12-18 20:46:45,016 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:46:45,016 INFO L85 PathProgramCache]: Analyzing trace with hash 187494673, now seen corresponding path program 1 times [2021-12-18 20:46:45,016 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-18 20:46:45,016 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1553094711] [2021-12-18 20:46:45,016 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:46:45,016 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-18 20:46:45,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:46:45,151 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2021-12-18 20:46:45,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:46:45,227 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2021-12-18 20:46:45,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:46:45,287 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-18 20:46:45,287 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-18 20:46:45,287 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1553094711] [2021-12-18 20:46:45,287 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1553094711] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 20:46:45,287 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [443758679] [2021-12-18 20:46:45,287 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:46:45,287 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-18 20:46:45,288 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-18 20:46:45,288 INFO L229 MonitoredProcess]: Starting monitored process 12 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-18 20:46:45,289 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-12-18 20:46:45,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:46:45,504 INFO L263 TraceCheckSpWp]: Trace formula consists of 477 conjuncts, 33 conjunts are in the unsatisfiable core [2021-12-18 20:46:45,507 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:46:45,518 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:46:45,528 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:46:45,763 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:46:45,764 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-18 20:46:45,777 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-12-18 20:46:45,777 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 17 treesize of output 21 [2021-12-18 20:46:45,908 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:46:45,909 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-18 20:46:45,913 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-18 20:46:45,913 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2021-12-18 20:46:45,966 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-18 20:46:45,966 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 12 treesize of output 18 [2021-12-18 20:46:46,032 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-18 20:46:46,032 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 20:46:46,216 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [443758679] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 20:46:46,216 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-18 20:46:46,216 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 9] total 21 [2021-12-18 20:46:46,216 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1637621795] [2021-12-18 20:46:46,216 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-18 20:46:46,216 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-12-18 20:46:46,216 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-18 20:46:46,217 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-12-18 20:46:46,217 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=603, Unknown=0, NotChecked=0, Total=702 [2021-12-18 20:46:46,217 INFO L87 Difference]: Start difference. First operand 228 states and 261 transitions. Second operand has 22 states, 21 states have (on average 4.619047619047619) internal successors, (97), 18 states have internal predecessors, (97), 5 states have call successors, (5), 4 states have call predecessors, (5), 4 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2021-12-18 20:46:46,502 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:46:46,502 INFO L93 Difference]: Finished difference Result 259 states and 288 transitions. [2021-12-18 20:46:46,503 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-12-18 20:46:46,503 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 4.619047619047619) internal successors, (97), 18 states have internal predecessors, (97), 5 states have call successors, (5), 4 states have call predecessors, (5), 4 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) Word has length 55 [2021-12-18 20:46:46,504 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:46:46,505 INFO L225 Difference]: With dead ends: 259 [2021-12-18 20:46:46,505 INFO L226 Difference]: Without dead ends: 259 [2021-12-18 20:46:46,505 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 55 SyntacticMatches, 2 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 217 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=149, Invalid=781, Unknown=0, NotChecked=0, Total=930 [2021-12-18 20:46:46,506 INFO L933 BasicCegarLoop]: 52 mSDtfsCounter, 407 mSDsluCounter, 328 mSDsCounter, 0 mSdLazyCounter, 403 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 407 SdHoareTripleChecker+Valid, 380 SdHoareTripleChecker+Invalid, 496 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 403 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 64 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-18 20:46:46,506 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [407 Valid, 380 Invalid, 496 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 403 Invalid, 0 Unknown, 64 Unchecked, 0.2s Time] [2021-12-18 20:46:46,506 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 259 states. [2021-12-18 20:46:46,509 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 259 to 226. [2021-12-18 20:46:46,510 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 226 states, 184 states have (on average 1.309782608695652) internal successors, (241), 211 states have internal predecessors, (241), 9 states have call successors, (9), 7 states have call predecessors, (9), 5 states have return successors, (9), 7 states have call predecessors, (9), 9 states have call successors, (9) [2021-12-18 20:46:46,511 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 226 states to 226 states and 259 transitions. [2021-12-18 20:46:46,511 INFO L78 Accepts]: Start accepts. Automaton has 226 states and 259 transitions. Word has length 55 [2021-12-18 20:46:46,511 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:46:46,511 INFO L470 AbstractCegarLoop]: Abstraction has 226 states and 259 transitions. [2021-12-18 20:46:46,511 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 21 states have (on average 4.619047619047619) internal successors, (97), 18 states have internal predecessors, (97), 5 states have call successors, (5), 4 states have call predecessors, (5), 4 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2021-12-18 20:46:46,511 INFO L276 IsEmpty]: Start isEmpty. Operand 226 states and 259 transitions. [2021-12-18 20:46:46,512 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-12-18 20:46:46,512 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:46:46,512 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 20:46:46,539 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-12-18 20:46:46,739 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-12-18 20:46:46,739 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting appendErr15REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 55 more)] === [2021-12-18 20:46:46,740 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:46:46,740 INFO L85 PathProgramCache]: Analyzing trace with hash 1517374114, now seen corresponding path program 1 times [2021-12-18 20:46:46,740 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-18 20:46:46,740 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2047499250] [2021-12-18 20:46:46,740 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:46:46,740 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-18 20:46:46,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:46:46,877 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2021-12-18 20:46:46,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:46:46,939 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2021-12-18 20:46:46,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:46:46,992 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-18 20:46:46,992 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-18 20:46:46,992 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2047499250] [2021-12-18 20:46:46,992 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2047499250] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 20:46:46,992 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [709628013] [2021-12-18 20:46:46,993 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:46:46,993 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-18 20:46:46,993 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-18 20:46:46,994 INFO L229 MonitoredProcess]: Starting monitored process 13 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-18 20:46:47,012 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-12-18 20:46:47,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:46:47,209 INFO L263 TraceCheckSpWp]: Trace formula consists of 478 conjuncts, 33 conjunts are in the unsatisfiable core [2021-12-18 20:46:47,213 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:46:47,222 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:46:47,226 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:46:47,433 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:46:47,434 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-18 20:46:47,450 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-12-18 20:46:47,450 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 17 treesize of output 21 [2021-12-18 20:46:47,604 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:46:47,605 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-18 20:46:47,610 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-18 20:46:47,610 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2021-12-18 20:46:47,665 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-18 20:46:47,666 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 12 treesize of output 18 [2021-12-18 20:46:47,758 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-18 20:46:47,759 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 20:46:47,983 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [709628013] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 20:46:47,983 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-18 20:46:47,983 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 9] total 21 [2021-12-18 20:46:47,984 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [676969402] [2021-12-18 20:46:47,984 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-18 20:46:47,984 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-12-18 20:46:47,984 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-18 20:46:47,985 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-12-18 20:46:47,985 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=603, Unknown=0, NotChecked=0, Total=702 [2021-12-18 20:46:47,985 INFO L87 Difference]: Start difference. First operand 226 states and 259 transitions. Second operand has 22 states, 21 states have (on average 4.714285714285714) internal successors, (99), 18 states have internal predecessors, (99), 5 states have call successors, (5), 4 states have call predecessors, (5), 4 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2021-12-18 20:46:48,297 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:46:48,297 INFO L93 Difference]: Finished difference Result 261 states and 287 transitions. [2021-12-18 20:46:48,297 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-12-18 20:46:48,298 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 4.714285714285714) internal successors, (99), 18 states have internal predecessors, (99), 5 states have call successors, (5), 4 states have call predecessors, (5), 4 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) Word has length 56 [2021-12-18 20:46:48,298 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:46:48,299 INFO L225 Difference]: With dead ends: 261 [2021-12-18 20:46:48,299 INFO L226 Difference]: Without dead ends: 261 [2021-12-18 20:46:48,299 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 57 SyntacticMatches, 2 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 216 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=147, Invalid=783, Unknown=0, NotChecked=0, Total=930 [2021-12-18 20:46:48,300 INFO L933 BasicCegarLoop]: 57 mSDtfsCounter, 439 mSDsluCounter, 455 mSDsCounter, 0 mSdLazyCounter, 348 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 439 SdHoareTripleChecker+Valid, 512 SdHoareTripleChecker+Invalid, 500 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 348 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 126 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-18 20:46:48,300 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [439 Valid, 512 Invalid, 500 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 348 Invalid, 0 Unknown, 126 Unchecked, 0.2s Time] [2021-12-18 20:46:48,301 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 261 states. [2021-12-18 20:46:48,304 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 261 to 227. [2021-12-18 20:46:48,304 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 227 states, 185 states have (on average 1.308108108108108) internal successors, (242), 212 states have internal predecessors, (242), 9 states have call successors, (9), 7 states have call predecessors, (9), 5 states have return successors, (9), 7 states have call predecessors, (9), 9 states have call successors, (9) [2021-12-18 20:46:48,305 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 227 states to 227 states and 260 transitions. [2021-12-18 20:46:48,305 INFO L78 Accepts]: Start accepts. Automaton has 227 states and 260 transitions. Word has length 56 [2021-12-18 20:46:48,305 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:46:48,305 INFO L470 AbstractCegarLoop]: Abstraction has 227 states and 260 transitions. [2021-12-18 20:46:48,305 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 21 states have (on average 4.714285714285714) internal successors, (99), 18 states have internal predecessors, (99), 5 states have call successors, (5), 4 states have call predecessors, (5), 4 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2021-12-18 20:46:48,305 INFO L276 IsEmpty]: Start isEmpty. Operand 227 states and 260 transitions. [2021-12-18 20:46:48,306 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-12-18 20:46:48,306 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:46:48,306 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 20:46:48,332 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-12-18 20:46:48,506 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-12-18 20:46:48,507 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting appendErr22REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 55 more)] === [2021-12-18 20:46:48,507 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:46:48,507 INFO L85 PathProgramCache]: Analyzing trace with hash -1542173709, now seen corresponding path program 1 times [2021-12-18 20:46:48,507 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-18 20:46:48,507 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [366394252] [2021-12-18 20:46:48,507 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:46:48,507 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-18 20:46:48,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:46:48,712 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2021-12-18 20:46:48,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:46:48,768 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 28 [2021-12-18 20:46:48,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:46:48,989 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 2 proven. 25 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-18 20:46:48,989 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-18 20:46:48,989 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [366394252] [2021-12-18 20:46:48,990 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [366394252] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 20:46:48,990 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1432060813] [2021-12-18 20:46:48,990 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:46:48,990 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-18 20:46:48,990 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-18 20:46:48,991 INFO L229 MonitoredProcess]: Starting monitored process 14 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-18 20:46:48,993 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-12-18 20:46:49,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:46:49,209 INFO L263 TraceCheckSpWp]: Trace formula consists of 518 conjuncts, 54 conjunts are in the unsatisfiable core [2021-12-18 20:46:49,211 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:46:49,220 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:46:49,328 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-12-18 20:46:49,328 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 12 treesize of output 14 [2021-12-18 20:46:49,515 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-12-18 20:46:49,550 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-18 20:46:49,551 INFO L388 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 16 treesize of output 22 [2021-12-18 20:46:49,563 INFO L388 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 7 treesize of output 3 [2021-12-18 20:46:49,610 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-18 20:46:49,610 INFO L388 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 20 treesize of output 26 [2021-12-18 20:46:49,679 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-18 20:46:49,684 INFO L354 Elim1Store]: treesize reduction 20, result has 33.3 percent of original size [2021-12-18 20:46:49,685 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 29 treesize of output 28 [2021-12-18 20:46:49,803 INFO L354 Elim1Store]: treesize reduction 54, result has 36.5 percent of original size [2021-12-18 20:46:49,803 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 28 treesize of output 45 [2021-12-18 20:46:49,846 INFO L388 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 38 treesize of output 36 [2021-12-18 20:46:49,994 INFO L388 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 38 treesize of output 36 [2021-12-18 20:46:50,035 INFO L388 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 38 treesize of output 36 [2021-12-18 20:46:50,089 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-18 20:46:50,090 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 13 [2021-12-18 20:46:50,120 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 15 proven. 12 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-18 20:46:50,120 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 20:46:50,441 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-18 20:46:50,442 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 33 treesize of output 34 [2021-12-18 20:46:50,451 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-18 20:46:50,452 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 170 treesize of output 122 [2021-12-18 20:46:50,455 INFO L388 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 86 treesize of output 78 [2021-12-18 20:46:50,459 INFO L388 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 40 treesize of output 36 [2021-12-18 20:46:51,568 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1432060813] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 20:46:51,568 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-18 20:46:51,568 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 15] total 33 [2021-12-18 20:46:51,568 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [810191838] [2021-12-18 20:46:51,569 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-18 20:46:51,569 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-12-18 20:46:51,569 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-18 20:46:51,569 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-12-18 20:46:51,570 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=142, Invalid=1401, Unknown=17, NotChecked=0, Total=1560 [2021-12-18 20:46:51,570 INFO L87 Difference]: Start difference. First operand 227 states and 260 transitions. Second operand has 34 states, 33 states have (on average 3.1818181818181817) internal successors, (105), 30 states have internal predecessors, (105), 5 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2021-12-18 20:46:52,442 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:46:52,442 INFO L93 Difference]: Finished difference Result 262 states and 292 transitions. [2021-12-18 20:46:52,442 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-12-18 20:46:52,442 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 33 states have (on average 3.1818181818181817) internal successors, (105), 30 states have internal predecessors, (105), 5 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) Word has length 58 [2021-12-18 20:46:52,443 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:46:52,443 INFO L225 Difference]: With dead ends: 262 [2021-12-18 20:46:52,443 INFO L226 Difference]: Without dead ends: 262 [2021-12-18 20:46:52,444 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 52 SyntacticMatches, 8 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 691 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=293, Invalid=2139, Unknown=18, NotChecked=0, Total=2450 [2021-12-18 20:46:52,445 INFO L933 BasicCegarLoop]: 66 mSDtfsCounter, 398 mSDsluCounter, 959 mSDsCounter, 0 mSdLazyCounter, 946 mSolverCounterSat, 38 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 398 SdHoareTripleChecker+Valid, 1025 SdHoareTripleChecker+Invalid, 1315 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 38 IncrementalHoareTripleChecker+Valid, 946 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 331 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-12-18 20:46:52,445 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [398 Valid, 1025 Invalid, 1315 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [38 Valid, 946 Invalid, 0 Unknown, 331 Unchecked, 0.4s Time] [2021-12-18 20:46:52,445 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 262 states. [2021-12-18 20:46:52,452 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 262 to 227. [2021-12-18 20:46:52,452 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 227 states, 185 states have (on average 1.3027027027027027) internal successors, (241), 212 states have internal predecessors, (241), 9 states have call successors, (9), 7 states have call predecessors, (9), 5 states have return successors, (9), 7 states have call predecessors, (9), 9 states have call successors, (9) [2021-12-18 20:46:52,453 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 227 states to 227 states and 259 transitions. [2021-12-18 20:46:52,453 INFO L78 Accepts]: Start accepts. Automaton has 227 states and 259 transitions. Word has length 58 [2021-12-18 20:46:52,454 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:46:52,454 INFO L470 AbstractCegarLoop]: Abstraction has 227 states and 259 transitions. [2021-12-18 20:46:52,454 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 33 states have (on average 3.1818181818181817) internal successors, (105), 30 states have internal predecessors, (105), 5 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2021-12-18 20:46:52,454 INFO L276 IsEmpty]: Start isEmpty. Operand 227 states and 259 transitions. [2021-12-18 20:46:52,454 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-12-18 20:46:52,455 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:46:52,455 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 20:46:52,475 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-12-18 20:46:52,667 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-12-18 20:46:52,667 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting appendErr23REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 55 more)] === [2021-12-18 20:46:52,668 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:46:52,668 INFO L85 PathProgramCache]: Analyzing trace with hash -1542173708, now seen corresponding path program 1 times [2021-12-18 20:46:52,668 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-18 20:46:52,668 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [35250300] [2021-12-18 20:46:52,668 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:46:52,669 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-18 20:46:52,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:46:52,887 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2021-12-18 20:46:52,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:46:52,931 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 28 [2021-12-18 20:46:52,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:46:53,162 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 2 proven. 25 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-18 20:46:53,162 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-18 20:46:53,162 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [35250300] [2021-12-18 20:46:53,162 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [35250300] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 20:46:53,162 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1100943282] [2021-12-18 20:46:53,162 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:46:53,162 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-18 20:46:53,163 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-18 20:46:53,163 INFO L229 MonitoredProcess]: Starting monitored process 15 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-18 20:46:53,164 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-12-18 20:46:53,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:46:53,393 INFO L263 TraceCheckSpWp]: Trace formula consists of 518 conjuncts, 71 conjunts are in the unsatisfiable core [2021-12-18 20:46:53,397 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:46:53,407 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:46:53,507 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-12-18 20:46:53,508 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 12 treesize of output 14 [2021-12-18 20:46:53,552 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:46:53,737 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-12-18 20:46:53,740 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-12-18 20:46:53,796 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-18 20:46:53,797 INFO L388 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 16 treesize of output 22 [2021-12-18 20:46:53,809 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-18 20:46:53,809 INFO L388 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 16 treesize of output 22 [2021-12-18 20:46:53,814 INFO L388 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 7 treesize of output 3 [2021-12-18 20:46:53,824 INFO L388 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 7 treesize of output 3 [2021-12-18 20:46:53,915 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-18 20:46:53,915 INFO L388 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 20 treesize of output 26 [2021-12-18 20:46:53,925 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-18 20:46:53,925 INFO L388 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 20 treesize of output 26 [2021-12-18 20:46:54,101 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-18 20:46:54,107 INFO L354 Elim1Store]: treesize reduction 20, result has 33.3 percent of original size [2021-12-18 20:46:54,107 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 29 treesize of output 28 [2021-12-18 20:46:54,248 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:46:54,249 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 20 [2021-12-18 20:46:54,259 INFO L354 Elim1Store]: treesize reduction 8, result has 65.2 percent of original size [2021-12-18 20:46:54,259 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 2 case distinctions, treesize of input 22 treesize of output 24 [2021-12-18 20:46:54,308 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 18 [2021-12-18 20:46:54,311 INFO L388 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 38 treesize of output 36 [2021-12-18 20:46:54,434 INFO L388 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 38 treesize of output 36 [2021-12-18 20:46:54,436 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 18 [2021-12-18 20:46:54,503 INFO L388 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 38 treesize of output 36 [2021-12-18 20:46:54,506 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 18 [2021-12-18 20:46:54,551 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-18 20:46:54,552 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 13 [2021-12-18 20:46:54,554 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-18 20:46:54,555 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 7 [2021-12-18 20:46:54,580 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 15 proven. 12 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-18 20:46:54,580 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 20:46:54,646 WARN L838 $PredicateComparison]: unable to prove that (and (forall ((v_ArrVal_3781 (Array Int Int))) (<= 0 (+ (select (select (store |c_#memory_$Pointer$.offset| c_append_~node~0.base v_ArrVal_3781) c_append_~head.base) (+ c_append_~head.offset 4)) 5))) (forall ((v_ArrVal_3781 (Array Int Int)) (v_ArrVal_3782 (Array Int Int))) (let ((.cse0 (+ c_append_~head.offset 4))) (<= (+ (select (select (store |c_#memory_$Pointer$.offset| c_append_~node~0.base v_ArrVal_3781) c_append_~head.base) .cse0) 9) (select |c_#length| (select (select (store |c_#memory_$Pointer$.base| c_append_~node~0.base v_ArrVal_3782) c_append_~head.base) .cse0)))))) is different from false [2021-12-18 20:46:55,050 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-18 20:46:55,050 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 85 treesize of output 86 [2021-12-18 20:46:55,054 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-18 20:46:55,061 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-18 20:46:55,061 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 129 treesize of output 129 [2021-12-18 20:46:55,067 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-18 20:46:55,067 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 125 treesize of output 105 [2021-12-18 20:46:55,070 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-18 20:46:55,076 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-18 20:46:55,076 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 164 treesize of output 152 [2021-12-18 20:46:55,088 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-18 20:46:55,089 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 728 treesize of output 708 [2021-12-18 20:46:55,100 INFO L388 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 708 treesize of output 592 [2021-12-18 20:46:55,110 INFO L388 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 592 treesize of output 524 [2021-12-18 20:46:56,631 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1100943282] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 20:46:56,631 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-18 20:46:56,631 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 14] total 31 [2021-12-18 20:46:56,631 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1366527238] [2021-12-18 20:46:56,631 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-18 20:46:56,632 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-12-18 20:46:56,632 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-18 20:46:56,632 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-12-18 20:46:56,632 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=1211, Unknown=3, NotChecked=70, Total=1406 [2021-12-18 20:46:56,633 INFO L87 Difference]: Start difference. First operand 227 states and 259 transitions. Second operand has 32 states, 31 states have (on average 3.3870967741935485) internal successors, (105), 28 states have internal predecessors, (105), 5 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2021-12-18 20:46:58,172 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:46:58,172 INFO L93 Difference]: Finished difference Result 272 states and 322 transitions. [2021-12-18 20:46:58,172 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-12-18 20:46:58,172 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 31 states have (on average 3.3870967741935485) internal successors, (105), 28 states have internal predecessors, (105), 5 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) Word has length 58 [2021-12-18 20:46:58,173 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:46:58,173 INFO L225 Difference]: With dead ends: 272 [2021-12-18 20:46:58,174 INFO L226 Difference]: Without dead ends: 272 [2021-12-18 20:46:58,175 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 62 SyntacticMatches, 5 SemanticMatches, 56 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 779 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=356, Invalid=2837, Unknown=3, NotChecked=110, Total=3306 [2021-12-18 20:46:58,175 INFO L933 BasicCegarLoop]: 80 mSDtfsCounter, 135 mSDsluCounter, 1085 mSDsCounter, 0 mSdLazyCounter, 655 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 135 SdHoareTripleChecker+Valid, 1165 SdHoareTripleChecker+Invalid, 953 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 655 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 279 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-18 20:46:58,175 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [135 Valid, 1165 Invalid, 953 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 655 Invalid, 0 Unknown, 279 Unchecked, 0.3s Time] [2021-12-18 20:46:58,176 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 272 states. [2021-12-18 20:46:58,190 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 272 to 233. [2021-12-18 20:46:58,191 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 233 states, 191 states have (on average 1.293193717277487) internal successors, (247), 218 states have internal predecessors, (247), 9 states have call successors, (9), 7 states have call predecessors, (9), 5 states have return successors, (9), 7 states have call predecessors, (9), 9 states have call successors, (9) [2021-12-18 20:46:58,194 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 233 states to 233 states and 265 transitions. [2021-12-18 20:46:58,194 INFO L78 Accepts]: Start accepts. Automaton has 233 states and 265 transitions. Word has length 58 [2021-12-18 20:46:58,194 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:46:58,194 INFO L470 AbstractCegarLoop]: Abstraction has 233 states and 265 transitions. [2021-12-18 20:46:58,194 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 31 states have (on average 3.3870967741935485) internal successors, (105), 28 states have internal predecessors, (105), 5 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2021-12-18 20:46:58,194 INFO L276 IsEmpty]: Start isEmpty. Operand 233 states and 265 transitions. [2021-12-18 20:46:58,195 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-12-18 20:46:58,195 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:46:58,195 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 20:46:58,213 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2021-12-18 20:46:58,396 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-18 20:46:58,396 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting appendErr15REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 55 more)] === [2021-12-18 20:46:58,396 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:46:58,396 INFO L85 PathProgramCache]: Analyzing trace with hash -2098569697, now seen corresponding path program 2 times [2021-12-18 20:46:58,396 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-18 20:46:58,396 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [942630914] [2021-12-18 20:46:58,396 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:46:58,396 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-18 20:46:58,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:46:58,459 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2021-12-18 20:46:58,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:46:58,469 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2021-12-18 20:46:58,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:46:58,479 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 13 proven. 2 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-12-18 20:46:58,479 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-18 20:46:58,479 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [942630914] [2021-12-18 20:46:58,479 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [942630914] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 20:46:58,479 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1756296263] [2021-12-18 20:46:58,480 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-18 20:46:58,480 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-18 20:46:58,480 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-18 20:46:58,484 INFO L229 MonitoredProcess]: Starting monitored process 16 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-18 20:46:58,510 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-12-18 20:46:58,710 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2021-12-18 20:46:58,710 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-18 20:46:58,711 INFO L263 TraceCheckSpWp]: Trace formula consists of 186 conjuncts, 3 conjunts are in the unsatisfiable core [2021-12-18 20:46:58,712 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:46:58,815 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-12-18 20:46:58,815 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-18 20:46:58,816 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1756296263] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-18 20:46:58,816 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-12-18 20:46:58,816 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [6] total 7 [2021-12-18 20:46:58,816 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [771957797] [2021-12-18 20:46:58,816 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-18 20:46:58,816 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-18 20:46:58,816 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-18 20:46:58,817 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-18 20:46:58,817 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-12-18 20:46:58,817 INFO L87 Difference]: Start difference. First operand 233 states and 265 transitions. Second operand has 3 states, 2 states have (on average 20.5) internal successors, (41), 3 states have internal predecessors, (41), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-18 20:46:58,860 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:46:58,860 INFO L93 Difference]: Finished difference Result 229 states and 261 transitions. [2021-12-18 20:46:58,861 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-18 20:46:58,862 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 20.5) internal successors, (41), 3 states have internal predecessors, (41), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 58 [2021-12-18 20:46:58,862 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:46:58,863 INFO L225 Difference]: With dead ends: 229 [2021-12-18 20:46:58,863 INFO L226 Difference]: Without dead ends: 229 [2021-12-18 20:46:58,863 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 60 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-12-18 20:46:58,863 INFO L933 BasicCegarLoop]: 88 mSDtfsCounter, 15 mSDsluCounter, 55 mSDsCounter, 0 mSdLazyCounter, 35 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 143 SdHoareTripleChecker+Invalid, 39 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 35 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-18 20:46:58,864 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 143 Invalid, 39 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 35 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-18 20:46:58,864 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 229 states. [2021-12-18 20:46:58,867 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 229 to 228. [2021-12-18 20:46:58,868 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 228 states, 190 states have (on average 1.2736842105263158) internal successors, (242), 213 states have internal predecessors, (242), 9 states have call successors, (9), 7 states have call predecessors, (9), 5 states have return successors, (9), 7 states have call predecessors, (9), 9 states have call successors, (9) [2021-12-18 20:46:58,869 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 228 states to 228 states and 260 transitions. [2021-12-18 20:46:58,869 INFO L78 Accepts]: Start accepts. Automaton has 228 states and 260 transitions. Word has length 58 [2021-12-18 20:46:58,870 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:46:58,870 INFO L470 AbstractCegarLoop]: Abstraction has 228 states and 260 transitions. [2021-12-18 20:46:58,870 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 20.5) internal successors, (41), 3 states have internal predecessors, (41), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-18 20:46:58,870 INFO L276 IsEmpty]: Start isEmpty. Operand 228 states and 260 transitions. [2021-12-18 20:46:58,871 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-12-18 20:46:58,871 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:46:58,871 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 20:46:58,894 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-12-18 20:46:59,083 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2021-12-18 20:46:59,083 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting appendErr23REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 55 more)] === [2021-12-18 20:46:59,084 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:46:59,084 INFO L85 PathProgramCache]: Analyzing trace with hash 2096051095, now seen corresponding path program 1 times [2021-12-18 20:46:59,084 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-18 20:46:59,084 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2124931700] [2021-12-18 20:46:59,084 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:46:59,084 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-18 20:46:59,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:46:59,212 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2021-12-18 20:46:59,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:46:59,273 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 28 [2021-12-18 20:46:59,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:46:59,464 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 8 proven. 23 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-18 20:46:59,464 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-18 20:46:59,464 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2124931700] [2021-12-18 20:46:59,464 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2124931700] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 20:46:59,464 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2003432272] [2021-12-18 20:46:59,464 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:46:59,464 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-18 20:46:59,465 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-18 20:46:59,466 INFO L229 MonitoredProcess]: Starting monitored process 17 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-18 20:46:59,495 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-12-18 20:46:59,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:46:59,739 INFO L263 TraceCheckSpWp]: Trace formula consists of 527 conjuncts, 54 conjunts are in the unsatisfiable core [2021-12-18 20:46:59,741 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:46:59,749 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:46:59,836 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-12-18 20:46:59,837 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 12 treesize of output 14 [2021-12-18 20:46:59,982 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-12-18 20:47:00,017 INFO L354 Elim1Store]: treesize reduction 21, result has 25.0 percent of original size [2021-12-18 20:47:00,017 INFO L388 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 1 case distinctions, treesize of input 21 treesize of output 20 [2021-12-18 20:47:00,067 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-18 20:47:00,068 INFO L388 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 1 case distinctions, treesize of input 23 treesize of output 27 [2021-12-18 20:47:00,072 INFO L354 Elim1Store]: treesize reduction 9, result has 10.0 percent of original size [2021-12-18 20:47:00,072 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 7 [2021-12-18 20:47:00,129 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-18 20:47:00,129 INFO L388 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 1 case distinctions, treesize of input 28 treesize of output 32 [2021-12-18 20:47:00,199 INFO L354 Elim1Store]: treesize reduction 4, result has 66.7 percent of original size [2021-12-18 20:47:00,199 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 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 15 treesize of output 15 [2021-12-18 20:47:00,284 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-18 20:47:00,284 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2021-12-18 20:47:00,322 INFO L388 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 34 treesize of output 30 [2021-12-18 20:47:00,351 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-18 20:47:00,351 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 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 35 treesize of output 15 [2021-12-18 20:47:00,369 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 8 proven. 23 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-18 20:47:00,369 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 20:47:00,394 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_4359 (Array Int Int))) (not (= (select (select (store |c_#memory_$Pointer$.base| c_append_~node~0.base v_ArrVal_4359) c_append_~head.base) c_append_~head.offset) 0))) is different from false [2021-12-18 20:47:00,401 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_append_~node~0.base_86 Int) (v_ArrVal_4359 (Array Int Int))) (or (not (= 0 (select |c_#valid| v_append_~node~0.base_86))) (not (= (select (select (store |c_#memory_$Pointer$.base| v_append_~node~0.base_86 v_ArrVal_4359) |c_append_#in~head.base|) |c_append_#in~head.offset|) 0)))) is different from false [2021-12-18 20:47:00,408 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_append_~node~0.base_86 Int) (v_ArrVal_4359 (Array Int Int))) (or (not (= 0 (select |c_#valid| v_append_~node~0.base_86))) (not (= (select (select (store |c_#memory_$Pointer$.base| v_append_~node~0.base_86 v_ArrVal_4359) |c_ULTIMATE.start_main_~list2~0#1.base|) |c_ULTIMATE.start_main_~list2~0#1.offset|) 0)))) is different from false [2021-12-18 20:47:00,490 INFO L354 Elim1Store]: treesize reduction 21, result has 47.5 percent of original size [2021-12-18 20:47:00,491 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 33 [2021-12-18 20:47:00,494 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-18 20:47:00,497 INFO L354 Elim1Store]: treesize reduction 9, result has 10.0 percent of original size [2021-12-18 20:47:00,497 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 64 treesize of output 34 [2021-12-18 20:47:00,501 INFO L388 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 20 treesize of output 18 [2021-12-18 20:47:00,508 INFO L354 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2021-12-18 20:47:00,508 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 12 [2021-12-18 20:47:00,717 INFO L354 Elim1Store]: treesize reduction 21, result has 47.5 percent of original size [2021-12-18 20:47:00,718 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 33 [2021-12-18 20:47:00,742 INFO L354 Elim1Store]: treesize reduction 10, result has 71.4 percent of original size [2021-12-18 20:47:00,742 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 75 treesize of output 85 [2021-12-18 20:47:00,747 INFO L388 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 52 treesize of output 48 [2021-12-18 20:47:00,750 INFO L388 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 48 treesize of output 46 [2021-12-18 20:47:01,080 INFO L354 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2021-12-18 20:47:01,081 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 12 [2021-12-18 20:47:01,389 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 6 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 6 not checked. [2021-12-18 20:47:01,390 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2003432272] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-18 20:47:01,390 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-18 20:47:01,390 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 17, 16] total 43 [2021-12-18 20:47:01,390 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [868502759] [2021-12-18 20:47:01,390 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-18 20:47:01,390 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2021-12-18 20:47:01,390 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-18 20:47:01,391 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-12-18 20:47:01,391 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=191, Invalid=1374, Unknown=7, NotChecked=234, Total=1806 [2021-12-18 20:47:01,391 INFO L87 Difference]: Start difference. First operand 228 states and 260 transitions. Second operand has 43 states, 43 states have (on average 3.1627906976744184) internal successors, (136), 37 states have internal predecessors, (136), 7 states have call successors, (9), 7 states have call predecessors, (9), 6 states have return successors, (6), 6 states have call predecessors, (6), 4 states have call successors, (6) [2021-12-18 20:47:02,142 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:47:02,143 INFO L93 Difference]: Finished difference Result 273 states and 304 transitions. [2021-12-18 20:47:02,143 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-12-18 20:47:02,143 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 3.1627906976744184) internal successors, (136), 37 states have internal predecessors, (136), 7 states have call successors, (9), 7 states have call predecessors, (9), 6 states have return successors, (6), 6 states have call predecessors, (6), 4 states have call successors, (6) Word has length 60 [2021-12-18 20:47:02,144 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:47:02,144 INFO L225 Difference]: With dead ends: 273 [2021-12-18 20:47:02,144 INFO L226 Difference]: Without dead ends: 273 [2021-12-18 20:47:02,145 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 99 SyntacticMatches, 7 SemanticMatches, 55 ConstructedPredicates, 3 IntricatePredicates, 0 DeprecatedPredicates, 846 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=396, Invalid=2460, Unknown=18, NotChecked=318, Total=3192 [2021-12-18 20:47:02,146 INFO L933 BasicCegarLoop]: 72 mSDtfsCounter, 121 mSDsluCounter, 1287 mSDsCounter, 0 mSdLazyCounter, 650 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 121 SdHoareTripleChecker+Valid, 1359 SdHoareTripleChecker+Invalid, 1083 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 650 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 413 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-18 20:47:02,146 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [121 Valid, 1359 Invalid, 1083 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 650 Invalid, 0 Unknown, 413 Unchecked, 0.3s Time] [2021-12-18 20:47:02,146 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 273 states. [2021-12-18 20:47:02,150 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 273 to 238. [2021-12-18 20:47:02,150 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 238 states, 198 states have (on average 1.2626262626262625) internal successors, (250), 221 states have internal predecessors, (250), 10 states have call successors, (10), 8 states have call predecessors, (10), 6 states have return successors, (13), 8 states have call predecessors, (13), 10 states have call successors, (13) [2021-12-18 20:47:02,151 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 238 states to 238 states and 273 transitions. [2021-12-18 20:47:02,151 INFO L78 Accepts]: Start accepts. Automaton has 238 states and 273 transitions. Word has length 60 [2021-12-18 20:47:02,151 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:47:02,151 INFO L470 AbstractCegarLoop]: Abstraction has 238 states and 273 transitions. [2021-12-18 20:47:02,152 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 3.1627906976744184) internal successors, (136), 37 states have internal predecessors, (136), 7 states have call successors, (9), 7 states have call predecessors, (9), 6 states have return successors, (6), 6 states have call predecessors, (6), 4 states have call successors, (6) [2021-12-18 20:47:02,152 INFO L276 IsEmpty]: Start isEmpty. Operand 238 states and 273 transitions. [2021-12-18 20:47:02,152 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-12-18 20:47:02,152 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:47:02,152 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 20:47:02,177 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-12-18 20:47:02,377 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-12-18 20:47:02,377 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting appendErr22REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 55 more)] === [2021-12-18 20:47:02,377 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:47:02,378 INFO L85 PathProgramCache]: Analyzing trace with hash 115708675, now seen corresponding path program 1 times [2021-12-18 20:47:02,378 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-18 20:47:02,378 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [246948915] [2021-12-18 20:47:02,378 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:47:02,378 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-18 20:47:02,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:47:02,540 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2021-12-18 20:47:02,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:47:02,551 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2021-12-18 20:47:02,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:47:02,630 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 18 proven. 13 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-18 20:47:02,630 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-18 20:47:02,630 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [246948915] [2021-12-18 20:47:02,630 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [246948915] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 20:47:02,630 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [606332336] [2021-12-18 20:47:02,630 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:47:02,631 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-18 20:47:02,631 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-18 20:47:02,632 INFO L229 MonitoredProcess]: Starting monitored process 18 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-18 20:47:02,633 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-12-18 20:47:02,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:47:02,908 INFO L263 TraceCheckSpWp]: Trace formula consists of 521 conjuncts, 44 conjunts are in the unsatisfiable core [2021-12-18 20:47:02,909 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:47:02,956 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:47:03,103 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-12-18 20:47:03,268 INFO L354 Elim1Store]: treesize reduction 68, result has 31.3 percent of original size [2021-12-18 20:47:03,268 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 28 treesize of output 45 [2021-12-18 20:47:03,323 INFO L388 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 28 treesize of output 28 [2021-12-18 20:47:03,463 INFO L388 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 28 treesize of output 28 [2021-12-18 20:47:03,516 INFO L388 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 28 treesize of output 28 [2021-12-18 20:47:03,566 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-18 20:47:03,567 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 13 [2021-12-18 20:47:03,600 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 20 proven. 11 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-18 20:47:03,600 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 20:47:03,668 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_append_~node~0.base_95 Int) (v_ArrVal_4664 (Array Int Int))) (or (not (= 0 (select |c_#valid| v_append_~node~0.base_95))) (= (select (store |c_#valid| v_append_~node~0.base_95 1) (select (select (store |c_#memory_$Pointer$.base| v_append_~node~0.base_95 v_ArrVal_4664) |c_append_#in~head.base|) (+ |c_append_#in~head.offset| 4))) 1))) is different from false [2021-12-18 20:47:03,675 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_append_~node~0.base_95 Int) (v_ArrVal_4664 (Array Int Int))) (or (not (= 0 (select |c_#valid| v_append_~node~0.base_95))) (= (select (store |c_#valid| v_append_~node~0.base_95 1) (select (select (store |c_#memory_$Pointer$.base| v_append_~node~0.base_95 v_ArrVal_4664) |c_ULTIMATE.start_main_~list~0#1.base|) (+ |c_ULTIMATE.start_main_~list~0#1.offset| 4))) 1))) is different from false [2021-12-18 20:47:03,746 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-18 20:47:03,746 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 30 treesize of output 31 [2021-12-18 20:47:03,758 INFO L354 Elim1Store]: treesize reduction 9, result has 25.0 percent of original size [2021-12-18 20:47:03,758 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 84 treesize of output 57 [2021-12-18 20:47:03,791 INFO L354 Elim1Store]: treesize reduction 18, result has 70.5 percent of original size [2021-12-18 20:47:03,791 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 100 treesize of output 130 [2021-12-18 20:47:03,797 INFO L388 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 37 treesize of output 25 [2021-12-18 20:47:03,931 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-18 20:47:03,932 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 27 treesize of output 28 [2021-12-18 20:47:03,940 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-18 20:47:03,941 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 46 treesize of output 49 [2021-12-18 20:47:03,945 INFO L388 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 16 treesize of output 12 [2021-12-18 20:47:08,792 INFO L354 Elim1Store]: treesize reduction 24, result has 4.0 percent of original size [2021-12-18 20:47:08,792 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 56 treesize of output 1 [2021-12-18 20:47:08,830 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 14 proven. 11 refuted. 0 times theorem prover too weak. 3 trivial. 6 not checked. [2021-12-18 20:47:08,830 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [606332336] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-18 20:47:08,830 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-18 20:47:08,830 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 10, 10] total 30 [2021-12-18 20:47:08,830 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1264780336] [2021-12-18 20:47:08,830 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-18 20:47:08,830 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-12-18 20:47:08,830 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-18 20:47:08,831 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-12-18 20:47:08,831 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=100, Invalid=713, Unknown=7, NotChecked=110, Total=930 [2021-12-18 20:47:08,831 INFO L87 Difference]: Start difference. First operand 238 states and 273 transitions. Second operand has 31 states, 30 states have (on average 4.133333333333334) internal successors, (124), 27 states have internal predecessors, (124), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (5), 5 states have call predecessors, (5), 2 states have call successors, (5) [2021-12-18 20:47:09,315 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:47:09,315 INFO L93 Difference]: Finished difference Result 342 states and 400 transitions. [2021-12-18 20:47:09,315 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-12-18 20:47:09,315 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 30 states have (on average 4.133333333333334) internal successors, (124), 27 states have internal predecessors, (124), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (5), 5 states have call predecessors, (5), 2 states have call successors, (5) Word has length 60 [2021-12-18 20:47:09,315 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:47:09,316 INFO L225 Difference]: With dead ends: 342 [2021-12-18 20:47:09,317 INFO L226 Difference]: Without dead ends: 342 [2021-12-18 20:47:09,317 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 108 SyntacticMatches, 9 SemanticMatches, 37 ConstructedPredicates, 2 IntricatePredicates, 1 DeprecatedPredicates, 367 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=216, Invalid=1112, Unknown=12, NotChecked=142, Total=1482 [2021-12-18 20:47:09,318 INFO L933 BasicCegarLoop]: 70 mSDtfsCounter, 232 mSDsluCounter, 959 mSDsCounter, 0 mSdLazyCounter, 514 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 234 SdHoareTripleChecker+Valid, 1029 SdHoareTripleChecker+Invalid, 1040 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 514 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 509 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-18 20:47:09,318 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [234 Valid, 1029 Invalid, 1040 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 514 Invalid, 0 Unknown, 509 Unchecked, 0.2s Time] [2021-12-18 20:47:09,318 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 342 states. [2021-12-18 20:47:09,322 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 342 to 238. [2021-12-18 20:47:09,323 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 238 states, 198 states have (on average 1.2575757575757576) internal successors, (249), 221 states have internal predecessors, (249), 10 states have call successors, (10), 8 states have call predecessors, (10), 6 states have return successors, (13), 8 states have call predecessors, (13), 10 states have call successors, (13) [2021-12-18 20:47:09,324 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 238 states to 238 states and 272 transitions. [2021-12-18 20:47:09,324 INFO L78 Accepts]: Start accepts. Automaton has 238 states and 272 transitions. Word has length 60 [2021-12-18 20:47:09,324 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:47:09,324 INFO L470 AbstractCegarLoop]: Abstraction has 238 states and 272 transitions. [2021-12-18 20:47:09,324 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 30 states have (on average 4.133333333333334) internal successors, (124), 27 states have internal predecessors, (124), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (5), 5 states have call predecessors, (5), 2 states have call successors, (5) [2021-12-18 20:47:09,324 INFO L276 IsEmpty]: Start isEmpty. Operand 238 states and 272 transitions. [2021-12-18 20:47:09,325 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-12-18 20:47:09,325 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:47:09,325 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 20:47:09,350 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-12-18 20:47:09,543 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-12-18 20:47:09,543 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting appendErr23REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 55 more)] === [2021-12-18 20:47:09,544 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:47:09,544 INFO L85 PathProgramCache]: Analyzing trace with hash 115708676, now seen corresponding path program 1 times [2021-12-18 20:47:09,544 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-18 20:47:09,544 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1216999639] [2021-12-18 20:47:09,544 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:47:09,544 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-18 20:47:09,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:47:09,707 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2021-12-18 20:47:09,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:47:09,720 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2021-12-18 20:47:09,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:47:09,806 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 18 proven. 13 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-18 20:47:09,806 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-18 20:47:09,806 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1216999639] [2021-12-18 20:47:09,806 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1216999639] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 20:47:09,806 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1363065050] [2021-12-18 20:47:09,808 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:47:09,808 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-18 20:47:09,808 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-18 20:47:09,809 INFO L229 MonitoredProcess]: Starting monitored process 19 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-18 20:47:09,811 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-12-18 20:47:10,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:47:10,113 INFO L263 TraceCheckSpWp]: Trace formula consists of 521 conjuncts, 60 conjunts are in the unsatisfiable core [2021-12-18 20:47:10,116 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:47:10,172 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:47:10,176 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:47:10,375 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-12-18 20:47:10,377 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-12-18 20:47:10,537 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:47:10,538 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 20 [2021-12-18 20:47:10,548 INFO L354 Elim1Store]: treesize reduction 22, result has 40.5 percent of original size [2021-12-18 20:47:10,549 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 22 treesize of output 24 [2021-12-18 20:47:10,588 INFO L388 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 28 treesize of output 28 [2021-12-18 20:47:10,591 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 18 [2021-12-18 20:47:10,712 INFO L388 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 28 treesize of output 28 [2021-12-18 20:47:10,715 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 18 [2021-12-18 20:47:10,751 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 18 [2021-12-18 20:47:10,765 INFO L388 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 28 treesize of output 28 [2021-12-18 20:47:10,808 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-18 20:47:10,809 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 9 [2021-12-18 20:47:10,812 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-18 20:47:10,814 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-18 20:47:10,814 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 10 [2021-12-18 20:47:10,839 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 20 proven. 11 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-18 20:47:10,839 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 20:47:10,890 WARN L838 $PredicateComparison]: unable to prove that (and (forall ((v_ArrVal_4969 (Array Int Int))) (<= 0 (+ (select (select (store |c_#memory_$Pointer$.offset| c_append_~node~0.base v_ArrVal_4969) c_append_~head.base) (+ c_append_~head.offset 4)) 5))) (forall ((v_ArrVal_4968 (Array Int Int)) (v_ArrVal_4969 (Array Int Int))) (let ((.cse0 (+ c_append_~head.offset 4))) (<= (+ (select (select (store |c_#memory_$Pointer$.offset| c_append_~node~0.base v_ArrVal_4969) c_append_~head.base) .cse0) 9) (select |c_#length| (select (select (store |c_#memory_$Pointer$.base| c_append_~node~0.base v_ArrVal_4968) c_append_~head.base) .cse0)))))) is different from false [2021-12-18 20:47:11,676 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-18 20:47:11,676 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 76 treesize of output 77 [2021-12-18 20:47:11,690 INFO L388 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 227 treesize of output 216 [2021-12-18 20:47:11,698 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-18 20:47:11,698 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 216 treesize of output 176 [2021-12-18 20:47:11,702 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-18 20:47:11,711 INFO L354 Elim1Store]: treesize reduction 9, result has 25.0 percent of original size [2021-12-18 20:47:11,711 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 161 treesize of output 128 [2021-12-18 20:47:11,715 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-18 20:47:11,721 INFO L354 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2021-12-18 20:47:11,721 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 110 treesize of output 68 [2021-12-18 20:47:11,729 INFO L354 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2021-12-18 20:47:11,730 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-12-18 20:47:12,005 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-18 20:47:12,005 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 73 treesize of output 74 [2021-12-18 20:47:12,009 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-18 20:47:12,010 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 74 treesize of output 64 [2021-12-18 20:47:12,016 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-18 20:47:12,016 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 94 treesize of output 97 [2021-12-18 20:47:12,036 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-18 20:47:12,036 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 159 treesize of output 150 [2021-12-18 20:47:12,040 INFO L388 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 111 treesize of output 103 [2021-12-18 20:47:12,044 INFO L388 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 103 treesize of output 95 [2021-12-18 20:47:12,047 INFO L388 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 95 treesize of output 91 [2021-12-18 20:47:12,716 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-18 20:47:12,759 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 14 proven. 10 refuted. 0 times theorem prover too weak. 3 trivial. 7 not checked. [2021-12-18 20:47:12,759 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1363065050] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-18 20:47:12,760 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-18 20:47:12,760 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11, 11] total 31 [2021-12-18 20:47:12,760 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1064373684] [2021-12-18 20:47:12,760 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-18 20:47:12,760 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-12-18 20:47:12,760 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-18 20:47:12,761 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-12-18 20:47:12,761 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=839, Unknown=1, NotChecked=58, Total=992 [2021-12-18 20:47:12,761 INFO L87 Difference]: Start difference. First operand 238 states and 272 transitions. Second operand has 32 states, 31 states have (on average 4.032258064516129) internal successors, (125), 28 states have internal predecessors, (125), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (5), 5 states have call predecessors, (5), 2 states have call successors, (5) [2021-12-18 20:47:13,656 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:47:13,656 INFO L93 Difference]: Finished difference Result 244 states and 277 transitions. [2021-12-18 20:47:13,657 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-12-18 20:47:13,657 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 31 states have (on average 4.032258064516129) internal successors, (125), 28 states have internal predecessors, (125), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (5), 5 states have call predecessors, (5), 2 states have call successors, (5) Word has length 60 [2021-12-18 20:47:13,658 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:47:13,659 INFO L225 Difference]: With dead ends: 244 [2021-12-18 20:47:13,659 INFO L226 Difference]: Without dead ends: 244 [2021-12-18 20:47:13,660 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 110 SyntacticMatches, 6 SemanticMatches, 42 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 330 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=257, Invalid=1552, Unknown=1, NotChecked=82, Total=1892 [2021-12-18 20:47:13,660 INFO L933 BasicCegarLoop]: 88 mSDtfsCounter, 116 mSDsluCounter, 1343 mSDsCounter, 0 mSdLazyCounter, 581 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 116 SdHoareTripleChecker+Valid, 1431 SdHoareTripleChecker+Invalid, 1205 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 581 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 602 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-18 20:47:13,660 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [116 Valid, 1431 Invalid, 1205 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 581 Invalid, 0 Unknown, 602 Unchecked, 0.3s Time] [2021-12-18 20:47:13,661 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 244 states. [2021-12-18 20:47:13,664 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 244 to 242. [2021-12-18 20:47:13,664 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 242 states, 201 states have (on average 1.2487562189054726) internal successors, (251), 225 states have internal predecessors, (251), 10 states have call successors, (10), 8 states have call predecessors, (10), 7 states have return successors, (13), 8 states have call predecessors, (13), 10 states have call successors, (13) [2021-12-18 20:47:13,665 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 242 states to 242 states and 274 transitions. [2021-12-18 20:47:13,665 INFO L78 Accepts]: Start accepts. Automaton has 242 states and 274 transitions. Word has length 60 [2021-12-18 20:47:13,666 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:47:13,666 INFO L470 AbstractCegarLoop]: Abstraction has 242 states and 274 transitions. [2021-12-18 20:47:13,666 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 31 states have (on average 4.032258064516129) internal successors, (125), 28 states have internal predecessors, (125), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (5), 5 states have call predecessors, (5), 2 states have call successors, (5) [2021-12-18 20:47:13,666 INFO L276 IsEmpty]: Start isEmpty. Operand 242 states and 274 transitions. [2021-12-18 20:47:13,667 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-12-18 20:47:13,667 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:47:13,667 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 20:47:13,692 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Ended with exit code 0 [2021-12-18 20:47:13,887 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-12-18 20:47:13,887 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting appendErr22REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 55 more)] === [2021-12-18 20:47:13,888 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:47:13,888 INFO L85 PathProgramCache]: Analyzing trace with hash -452149625, now seen corresponding path program 1 times [2021-12-18 20:47:13,888 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-18 20:47:13,888 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [128933969] [2021-12-18 20:47:13,888 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:47:13,888 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-18 20:47:13,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:47:14,145 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2021-12-18 20:47:14,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:47:15,874 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2021-12-18 20:47:15,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:47:17,798 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 8 proven. 21 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-18 20:47:17,798 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-18 20:47:17,798 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [128933969] [2021-12-18 20:47:17,798 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [128933969] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 20:47:17,798 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [104243792] [2021-12-18 20:47:17,799 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:47:17,799 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-18 20:47:17,799 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-18 20:47:17,800 INFO L229 MonitoredProcess]: Starting monitored process 20 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-18 20:47:17,803 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-12-18 20:47:18,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:47:18,107 INFO L263 TraceCheckSpWp]: Trace formula consists of 527 conjuncts, 115 conjunts are in the unsatisfiable core [2021-12-18 20:47:18,118 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:47:18,122 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:47:18,192 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-12-18 20:47:18,193 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 17 treesize of output 21 [2021-12-18 20:47:18,253 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-12-18 20:47:18,259 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-12-18 20:47:18,317 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:47:18,318 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 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 [2021-12-18 20:47:18,325 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:47:18,348 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 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 [2021-12-18 20:47:18,781 INFO L388 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 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 17 [2021-12-18 20:47:19,100 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:47:19,103 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:47:19,103 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 32 [2021-12-18 20:47:19,110 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:47:19,112 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:47:19,113 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 32 [2021-12-18 20:47:19,121 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-18 20:47:19,139 INFO L354 Elim1Store]: treesize reduction 49, result has 34.7 percent of original size [2021-12-18 20:47:19,140 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 34 treesize of output 46 [2021-12-18 20:47:19,941 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:47:19,943 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:47:19,943 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:47:19,965 INFO L354 Elim1Store]: treesize reduction 42, result has 27.6 percent of original size [2021-12-18 20:47:19,966 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 84 treesize of output 81 [2021-12-18 20:47:19,972 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:47:19,973 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:47:19,973 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:47:19,974 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:47:19,975 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:47:19,975 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 8 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 37 [2021-12-18 20:47:19,980 INFO L388 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 26 treesize of output 14 [2021-12-18 20:47:20,007 INFO L354 Elim1Store]: treesize reduction 60, result has 31.8 percent of original size [2021-12-18 20:47:20,007 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 29 treesize of output 40 [2021-12-18 20:47:22,364 INFO L354 Elim1Store]: treesize reduction 12, result has 52.0 percent of original size [2021-12-18 20:47:22,364 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 21 treesize of output 25 [2021-12-18 20:47:22,422 INFO L388 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 21 [2021-12-18 20:47:22,425 INFO L388 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 21 [2021-12-18 20:47:22,479 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 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 22 treesize of output 10 [2021-12-18 20:47:22,482 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-18 20:47:22,482 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 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 22 treesize of output 10 [2021-12-18 20:47:22,501 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 10 proven. 19 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-18 20:47:22,501 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 20:47:22,535 WARN L838 $PredicateComparison]: unable to prove that (and (forall ((v_ArrVal_5300 (Array Int Int))) (= (select (select (store |c_#memory_$Pointer$.offset| c_append_~node~0.base v_ArrVal_5300) c_append_~head.base) c_append_~head.offset) 0)) (forall ((v_ArrVal_5301 (Array Int Int))) (= (select (select (store |c_#memory_$Pointer$.base| c_append_~node~0.base v_ArrVal_5301) c_append_~head.base) c_append_~head.offset) 0))) is different from false [2021-12-18 20:47:26,836 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_append_~node~0.base_111 Int)) (or (and (forall ((v_ArrVal_5301 (Array Int Int))) (= (select (select (store |c_#memory_$Pointer$.base| v_append_~node~0.base_111 v_ArrVal_5301) |c_ULTIMATE.start_main_~list2~0#1.base|) |c_ULTIMATE.start_main_~list2~0#1.offset|) 0)) (forall ((v_ArrVal_5300 (Array Int Int))) (= (select (select (store |c_#memory_$Pointer$.offset| v_append_~node~0.base_111 v_ArrVal_5300) |c_ULTIMATE.start_main_~list2~0#1.base|) |c_ULTIMATE.start_main_~list2~0#1.offset|) 0))) (not (= 0 (select |c_#valid| v_append_~node~0.base_111))))) is different from false [2021-12-18 20:47:29,381 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [104243792] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 20:47:29,381 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-18 20:47:29,382 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 27] total 46 [2021-12-18 20:47:29,382 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1278366299] [2021-12-18 20:47:29,382 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-18 20:47:29,382 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2021-12-18 20:47:29,382 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-18 20:47:29,383 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-12-18 20:47:29,383 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=183, Invalid=2019, Unknown=62, NotChecked=186, Total=2450 [2021-12-18 20:47:29,383 INFO L87 Difference]: Start difference. First operand 242 states and 274 transitions. Second operand has 46 states, 46 states have (on average 2.1956521739130435) internal successors, (101), 42 states have internal predecessors, (101), 6 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-12-18 20:47:35,233 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:47:35,233 INFO L93 Difference]: Finished difference Result 258 states and 292 transitions. [2021-12-18 20:47:35,234 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-12-18 20:47:35,234 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 2.1956521739130435) internal successors, (101), 42 states have internal predecessors, (101), 6 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 61 [2021-12-18 20:47:35,234 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:47:35,235 INFO L225 Difference]: With dead ends: 258 [2021-12-18 20:47:35,235 INFO L226 Difference]: Without dead ends: 258 [2021-12-18 20:47:35,237 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 129 GetRequests, 59 SyntacticMatches, 7 SemanticMatches, 63 ConstructedPredicates, 2 IntricatePredicates, 0 DeprecatedPredicates, 1126 ImplicationChecksByTransitivity, 16.5s TimeCoverageRelationStatistics Valid=315, Invalid=3488, Unknown=111, NotChecked=246, Total=4160 [2021-12-18 20:47:35,237 INFO L933 BasicCegarLoop]: 88 mSDtfsCounter, 116 mSDsluCounter, 1416 mSDsCounter, 0 mSdLazyCounter, 542 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 116 SdHoareTripleChecker+Valid, 1504 SdHoareTripleChecker+Invalid, 1017 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 542 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 449 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-12-18 20:47:35,237 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [116 Valid, 1504 Invalid, 1017 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 542 Invalid, 0 Unknown, 449 Unchecked, 0.4s Time] [2021-12-18 20:47:35,238 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 258 states. [2021-12-18 20:47:35,241 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 258 to 244. [2021-12-18 20:47:35,242 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 244 states, 203 states have (on average 1.2463054187192117) internal successors, (253), 227 states have internal predecessors, (253), 10 states have call successors, (10), 8 states have call predecessors, (10), 7 states have return successors, (13), 8 states have call predecessors, (13), 10 states have call successors, (13) [2021-12-18 20:47:35,243 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 244 states to 244 states and 276 transitions. [2021-12-18 20:47:35,243 INFO L78 Accepts]: Start accepts. Automaton has 244 states and 276 transitions. Word has length 61 [2021-12-18 20:47:35,243 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:47:35,243 INFO L470 AbstractCegarLoop]: Abstraction has 244 states and 276 transitions. [2021-12-18 20:47:35,243 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 2.1956521739130435) internal successors, (101), 42 states have internal predecessors, (101), 6 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-12-18 20:47:35,244 INFO L276 IsEmpty]: Start isEmpty. Operand 244 states and 276 transitions. [2021-12-18 20:47:35,244 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-12-18 20:47:35,244 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:47:35,244 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 20:47:35,266 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Ended with exit code 0 [2021-12-18 20:47:35,455 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,20 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-18 20:47:35,455 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting appendErr22REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 55 more)] === [2021-12-18 20:47:35,456 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:47:35,456 INFO L85 PathProgramCache]: Analyzing trace with hash 1637175594, now seen corresponding path program 2 times [2021-12-18 20:47:35,456 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-18 20:47:35,456 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1408423944] [2021-12-18 20:47:35,456 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:47:35,456 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-18 20:47:35,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:47:35,802 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2021-12-18 20:47:35,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:47:37,482 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2021-12-18 20:47:37,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:47:40,197 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 6 proven. 25 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-18 20:47:40,197 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-18 20:47:40,198 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1408423944] [2021-12-18 20:47:40,198 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1408423944] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 20:47:40,198 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1388971977] [2021-12-18 20:47:40,198 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-18 20:47:40,198 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-18 20:47:40,198 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-18 20:47:40,199 INFO L229 MonitoredProcess]: Starting monitored process 21 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-18 20:47:40,200 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-12-18 20:47:40,599 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-18 20:47:40,599 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-18 20:47:40,602 INFO L263 TraceCheckSpWp]: Trace formula consists of 536 conjuncts, 106 conjunts are in the unsatisfiable core [2021-12-18 20:47:40,606 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:47:40,610 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:47:40,656 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-12-18 20:47:40,657 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 17 treesize of output 21 [2021-12-18 20:47:40,710 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-12-18 20:47:40,715 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-12-18 20:47:41,373 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:47:41,374 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:47:41,375 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 23 [2021-12-18 20:47:41,380 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:47:41,381 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:47:41,381 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 23 [2021-12-18 20:47:41,406 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-12-18 20:47:41,407 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 22 treesize of output 33 [2021-12-18 20:47:42,246 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:47:42,247 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:47:42,308 INFO L354 Elim1Store]: treesize reduction 80, result has 47.7 percent of original size [2021-12-18 20:47:42,309 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 4 new quantified variables, introduced 9 case distinctions, treesize of input 56 treesize of output 106 [2021-12-18 20:47:42,318 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:47:42,319 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:47:42,376 INFO L354 Elim1Store]: treesize reduction 80, result has 47.7 percent of original size [2021-12-18 20:47:42,376 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 4 new quantified variables, introduced 9 case distinctions, treesize of input 56 treesize of output 106 [2021-12-18 20:47:42,414 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-12-18 20:47:42,415 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 22 treesize of output 33 [2021-12-18 20:47:42,431 INFO L388 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 10 treesize of output 9 [2021-12-18 20:47:42,464 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 9 [2021-12-18 20:47:42,486 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 9 [2021-12-18 20:47:42,537 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:47:42,538 INFO L388 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 10 treesize of output 1 [2021-12-18 20:47:42,595 INFO L354 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2021-12-18 20:47:42,596 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 22 [2021-12-18 20:47:42,664 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-12-18 20:47:42,704 INFO L354 Elim1Store]: treesize reduction 21, result has 41.7 percent of original size [2021-12-18 20:47:42,705 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 28 [2021-12-18 20:47:47,207 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 23 [2021-12-18 20:47:47,260 WARN L220 Elim1Store]: Array PQE input equivalent to false [2021-12-18 20:47:47,336 WARN L220 Elim1Store]: Array PQE input equivalent to false [2021-12-18 20:47:47,609 INFO L354 Elim1Store]: treesize reduction 8, result has 52.9 percent of original size [2021-12-18 20:47:47,610 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 43 treesize of output 39 [2021-12-18 20:47:47,653 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 43 treesize of output 31 [2021-12-18 20:47:47,714 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 19 [2021-12-18 20:47:47,759 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 23 [2021-12-18 20:47:47,772 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 23 [2021-12-18 20:47:48,736 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 43 treesize of output 33 [2021-12-18 20:47:48,744 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 21 [2021-12-18 20:47:48,777 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 25 [2021-12-18 20:47:48,780 INFO L388 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 7 treesize of output 3 [2021-12-18 20:47:48,806 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 23 [2021-12-18 20:47:53,528 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-12-18 20:47:53,529 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 27 treesize of output 45 [2021-12-18 20:47:53,691 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 5 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 46 [2021-12-18 20:47:53,697 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 5 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 46 [2021-12-18 20:47:54,656 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 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 9 treesize of output 3 [2021-12-18 20:47:54,728 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 58 treesize of output 52 [2021-12-18 20:47:54,772 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 58 treesize of output 52 [2021-12-18 20:47:54,844 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 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 51 treesize of output 21 [2021-12-18 20:47:54,920 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 5 proven. 24 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-18 20:47:54,920 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 20:47:55,004 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_5649 (Array Int Int))) (= 1 (select |c_#valid| (select (select (store |c_#memory_$Pointer$.base| c_append_~node~0.base v_ArrVal_5649) c_append_~head.base) (+ c_append_~head.offset 4))))) is different from false [2021-12-18 20:48:02,117 WARN L838 $PredicateComparison]: unable to prove that (or (and (forall ((v_ArrVal_5646 (Array Int Int))) (= (select (select (store |c_#memory_$Pointer$.base| c_append_~node~0.base v_ArrVal_5646) c_append_~head.base) (+ c_append_~head.offset 4)) 0)) (forall ((v_ArrVal_5647 (Array Int Int))) (= (select (select (store |c_#memory_$Pointer$.offset| c_append_~node~0.base v_ArrVal_5647) c_append_~head.base) (+ c_append_~head.offset 4)) 0))) (forall ((v_ArrVal_5649 (Array Int Int))) (= 1 (select |c_#valid| (select (select (store |c_#memory_$Pointer$.base| c_append_~node~0.base v_ArrVal_5649) c_append_~head.base) (+ c_append_~head.offset 4)))))) is different from false [2021-12-18 20:48:10,485 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1388971977] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 20:48:10,485 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-18 20:48:10,485 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 24] total 50 [2021-12-18 20:48:10,485 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1249510591] [2021-12-18 20:48:10,486 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-18 20:48:10,486 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2021-12-18 20:48:10,486 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-18 20:48:10,486 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-12-18 20:48:10,487 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=224, Invalid=3011, Unknown=79, NotChecked=226, Total=3540 [2021-12-18 20:48:10,487 INFO L87 Difference]: Start difference. First operand 244 states and 276 transitions. Second operand has 50 states, 50 states have (on average 2.28) internal successors, (114), 46 states have internal predecessors, (114), 5 states have call successors, (5), 4 states have call predecessors, (5), 4 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2021-12-18 20:48:29,925 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:48:29,925 INFO L93 Difference]: Finished difference Result 295 states and 327 transitions. [2021-12-18 20:48:29,925 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-12-18 20:48:29,926 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 2.28) internal successors, (114), 46 states have internal predecessors, (114), 5 states have call successors, (5), 4 states have call predecessors, (5), 4 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) Word has length 63 [2021-12-18 20:48:29,926 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:48:29,927 INFO L225 Difference]: With dead ends: 295 [2021-12-18 20:48:29,927 INFO L226 Difference]: Without dead ends: 295 [2021-12-18 20:48:29,929 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 60 SyntacticMatches, 7 SemanticMatches, 84 ConstructedPredicates, 2 IntricatePredicates, 0 DeprecatedPredicates, 1974 ImplicationChecksByTransitivity, 40.4s TimeCoverageRelationStatistics Valid=619, Invalid=6147, Unknown=214, NotChecked=330, Total=7310 [2021-12-18 20:48:29,929 INFO L933 BasicCegarLoop]: 76 mSDtfsCounter, 121 mSDsluCounter, 1508 mSDsCounter, 0 mSdLazyCounter, 762 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 121 SdHoareTripleChecker+Valid, 1584 SdHoareTripleChecker+Invalid, 1459 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 762 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 664 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-12-18 20:48:29,929 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [121 Valid, 1584 Invalid, 1459 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 762 Invalid, 0 Unknown, 664 Unchecked, 0.6s Time] [2021-12-18 20:48:29,930 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 295 states. [2021-12-18 20:48:29,933 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 295 to 249. [2021-12-18 20:48:29,934 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 249 states, 207 states have (on average 1.2415458937198067) internal successors, (257), 232 states have internal predecessors, (257), 10 states have call successors, (10), 8 states have call predecessors, (10), 8 states have return successors, (14), 8 states have call predecessors, (14), 10 states have call successors, (14) [2021-12-18 20:48:29,935 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 249 states to 249 states and 281 transitions. [2021-12-18 20:48:29,935 INFO L78 Accepts]: Start accepts. Automaton has 249 states and 281 transitions. Word has length 63 [2021-12-18 20:48:29,935 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:48:29,935 INFO L470 AbstractCegarLoop]: Abstraction has 249 states and 281 transitions. [2021-12-18 20:48:29,935 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 2.28) internal successors, (114), 46 states have internal predecessors, (114), 5 states have call successors, (5), 4 states have call predecessors, (5), 4 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2021-12-18 20:48:29,936 INFO L276 IsEmpty]: Start isEmpty. Operand 249 states and 281 transitions. [2021-12-18 20:48:29,936 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2021-12-18 20:48:29,936 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:48:29,936 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 20:48:29,965 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-12-18 20:48:30,163 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable30 [2021-12-18 20:48:30,163 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting appendErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 55 more)] === [2021-12-18 20:48:30,163 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:48:30,164 INFO L85 PathProgramCache]: Analyzing trace with hash 575607356, now seen corresponding path program 2 times [2021-12-18 20:48:30,164 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-18 20:48:30,164 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2085252747] [2021-12-18 20:48:30,164 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:48:30,164 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-18 20:48:30,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:48:30,346 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2021-12-18 20:48:30,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:48:30,417 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2021-12-18 20:48:30,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:48:30,452 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 47 [2021-12-18 20:48:30,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:48:30,509 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-12-18 20:48:30,510 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-18 20:48:30,510 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2085252747] [2021-12-18 20:48:30,510 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2085252747] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 20:48:30,510 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1744088100] [2021-12-18 20:48:30,510 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-18 20:48:30,510 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-18 20:48:30,511 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-18 20:48:30,512 INFO L229 MonitoredProcess]: Starting monitored process 22 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-18 20:48:30,514 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-12-18 20:48:30,917 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-18 20:48:30,917 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-18 20:48:30,921 INFO L263 TraceCheckSpWp]: Trace formula consists of 619 conjuncts, 103 conjunts are in the unsatisfiable core [2021-12-18 20:48:30,924 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:48:30,929 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:48:30,954 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:48:30,964 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-12-18 20:48:30,964 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 12 treesize of output 14 [2021-12-18 20:48:31,198 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-12-18 20:48:31,237 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-18 20:48:31,237 INFO L388 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 16 treesize of output 22 [2021-12-18 20:48:31,254 INFO L388 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 7 treesize of output 3 [2021-12-18 20:48:31,306 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-18 20:48:31,306 INFO L388 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 20 treesize of output 26 [2021-12-18 20:48:31,394 INFO L354 Elim1Store]: treesize reduction 17, result has 46.9 percent of original size [2021-12-18 20:48:31,394 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 30 [2021-12-18 20:48:31,410 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-18 20:48:31,426 INFO L354 Elim1Store]: treesize reduction 57, result has 31.3 percent of original size [2021-12-18 20:48:31,427 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 34 treesize of output 46 [2021-12-18 20:48:31,930 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-12-18 20:48:31,996 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:48:31,996 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 20 [2021-12-18 20:48:32,000 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-18 20:48:32,029 INFO L354 Elim1Store]: treesize reduction 105, result has 33.5 percent of original size [2021-12-18 20:48:32,029 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 45 treesize of output 76 [2021-12-18 20:48:32,032 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 48 treesize of output 24 [2021-12-18 20:48:32,665 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 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 42 treesize of output 18 [2021-12-18 20:48:32,669 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:48:32,669 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-18 20:48:32,687 INFO L354 Elim1Store]: treesize reduction 24, result has 41.5 percent of original size [2021-12-18 20:48:32,687 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 5 select indices, 5 select index equivalence classes, 5 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 5 case distinctions, treesize of input 26 treesize of output 32 [2021-12-18 20:48:32,724 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-18 20:48:32,724 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 12 treesize of output 18 [2021-12-18 20:48:32,760 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 10 proven. 42 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-18 20:48:32,760 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 20:48:33,090 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1744088100] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 20:48:33,090 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-18 20:48:33,090 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 25] total 35 [2021-12-18 20:48:33,091 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1856134635] [2021-12-18 20:48:33,091 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-18 20:48:33,091 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-12-18 20:48:33,091 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-18 20:48:33,091 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-12-18 20:48:33,092 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=190, Invalid=1358, Unknown=12, NotChecked=0, Total=1560 [2021-12-18 20:48:33,092 INFO L87 Difference]: Start difference. First operand 249 states and 281 transitions. Second operand has 36 states, 35 states have (on average 3.342857142857143) internal successors, (117), 32 states have internal predecessors, (117), 6 states have call successors, (6), 4 states have call predecessors, (6), 5 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) [2021-12-18 20:48:33,327 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:48:33,327 INFO L93 Difference]: Finished difference Result 248 states and 280 transitions. [2021-12-18 20:48:33,327 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-12-18 20:48:33,327 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 35 states have (on average 3.342857142857143) internal successors, (117), 32 states have internal predecessors, (117), 6 states have call successors, (6), 4 states have call predecessors, (6), 5 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) Word has length 72 [2021-12-18 20:48:33,327 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:48:33,328 INFO L225 Difference]: With dead ends: 248 [2021-12-18 20:48:33,328 INFO L226 Difference]: Without dead ends: 248 [2021-12-18 20:48:33,329 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 58 SyntacticMatches, 5 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 776 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=242, Invalid=1723, Unknown=15, NotChecked=0, Total=1980 [2021-12-18 20:48:33,329 INFO L933 BasicCegarLoop]: 89 mSDtfsCounter, 55 mSDsluCounter, 856 mSDsCounter, 0 mSdLazyCounter, 157 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 55 SdHoareTripleChecker+Valid, 945 SdHoareTripleChecker+Invalid, 325 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 157 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 166 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-18 20:48:33,330 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [55 Valid, 945 Invalid, 325 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 157 Invalid, 0 Unknown, 166 Unchecked, 0.1s Time] [2021-12-18 20:48:33,330 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 248 states. [2021-12-18 20:48:33,334 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 248 to 248. [2021-12-18 20:48:33,334 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 248 states, 207 states have (on average 1.2367149758454106) internal successors, (256), 231 states have internal predecessors, (256), 10 states have call successors, (10), 8 states have call predecessors, (10), 8 states have return successors, (14), 8 states have call predecessors, (14), 10 states have call successors, (14) [2021-12-18 20:48:33,335 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 248 states to 248 states and 280 transitions. [2021-12-18 20:48:33,335 INFO L78 Accepts]: Start accepts. Automaton has 248 states and 280 transitions. Word has length 72 [2021-12-18 20:48:33,335 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:48:33,335 INFO L470 AbstractCegarLoop]: Abstraction has 248 states and 280 transitions. [2021-12-18 20:48:33,336 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 35 states have (on average 3.342857142857143) internal successors, (117), 32 states have internal predecessors, (117), 6 states have call successors, (6), 4 states have call predecessors, (6), 5 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) [2021-12-18 20:48:33,336 INFO L276 IsEmpty]: Start isEmpty. Operand 248 states and 280 transitions. [2021-12-18 20:48:33,337 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-12-18 20:48:33,337 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:48:33,337 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 20:48:33,358 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2021-12-18 20:48:33,547 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,22 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-18 20:48:33,547 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting appendErr23REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 55 more)] === [2021-12-18 20:48:33,548 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:48:33,548 INFO L85 PathProgramCache]: Analyzing trace with hash -1253615965, now seen corresponding path program 1 times [2021-12-18 20:48:33,548 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-18 20:48:33,548 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [375338065] [2021-12-18 20:48:33,548 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:48:33,548 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-18 20:48:33,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:48:33,745 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2021-12-18 20:48:33,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:48:33,797 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 28 [2021-12-18 20:48:33,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:48:33,978 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 45 [2021-12-18 20:48:33,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:48:34,532 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 15 proven. 47 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-18 20:48:34,532 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-18 20:48:34,532 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [375338065] [2021-12-18 20:48:34,532 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [375338065] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 20:48:34,532 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1061252780] [2021-12-18 20:48:34,532 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:48:34,532 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-18 20:48:34,532 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-18 20:48:34,533 INFO L229 MonitoredProcess]: Starting monitored process 23 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-18 20:48:34,534 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-12-18 20:48:34,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:48:34,882 INFO L263 TraceCheckSpWp]: Trace formula consists of 679 conjuncts, 69 conjunts are in the unsatisfiable core [2021-12-18 20:48:34,885 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:48:35,265 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-18 20:48:35,266 INFO L388 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 1 case distinctions, treesize of input 24 treesize of output 30 [2021-12-18 20:48:35,276 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-18 20:48:35,276 INFO L388 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 1 case distinctions, treesize of input 22 treesize of output 28 [2021-12-18 20:48:35,287 INFO L388 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 6 treesize of output 4 [2021-12-18 20:48:35,386 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-18 20:48:35,386 INFO L388 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 1 case distinctions, treesize of input 27 treesize of output 33 [2021-12-18 20:48:35,396 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-18 20:48:35,397 INFO L388 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 1 case distinctions, treesize of input 25 treesize of output 31 [2021-12-18 20:48:35,509 INFO L354 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2021-12-18 20:48:35,509 INFO L388 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 34 treesize of output 43 [2021-12-18 20:48:35,528 INFO L354 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2021-12-18 20:48:35,529 INFO L388 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 1 case distinctions, treesize of input 30 treesize of output 39 [2021-12-18 20:48:35,692 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:48:35,703 INFO L354 Elim1Store]: treesize reduction 49, result has 15.5 percent of original size [2021-12-18 20:48:35,703 INFO L388 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 2 case distinctions, treesize of input 67 treesize of output 51 [2021-12-18 20:48:35,707 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:48:35,708 INFO L388 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 40 treesize of output 39 [2021-12-18 20:48:37,797 INFO L354 Elim1Store]: treesize reduction 4, result has 71.4 percent of original size [2021-12-18 20:48:37,797 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 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 17 treesize of output 17 [2021-12-18 20:48:37,940 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-18 20:48:37,941 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2021-12-18 20:48:37,991 INFO L388 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 40 treesize of output 38 [2021-12-18 20:48:37,994 INFO L388 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 24 treesize of output 26 [2021-12-18 20:48:38,038 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 17 [2021-12-18 20:48:38,051 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-18 20:48:38,051 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 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 37 treesize of output 21 [2021-12-18 20:48:38,096 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 55 proven. 9 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-18 20:48:38,096 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 20:48:38,149 WARN L838 $PredicateComparison]: unable to prove that (or (forall ((v_ArrVal_6456 (Array Int Int))) (not (= 0 (select (select (store |c_#memory_$Pointer$.base| c_append_~node~0.base v_ArrVal_6456) c_append_~head.base) c_append_~head.offset)))) (forall ((v_ArrVal_6455 (Array Int Int))) (not (= 0 (select (select (store |c_#memory_$Pointer$.offset| c_append_~node~0.base v_ArrVal_6455) c_append_~head.base) c_append_~head.offset))))) is different from false [2021-12-18 20:48:38,170 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_append_~node~0.base_124 Int) (v_ArrVal_6456 (Array Int Int)) (v_ArrVal_6455 (Array Int Int))) (or (not (= 0 (select (select (store |c_#memory_$Pointer$.base| v_append_~node~0.base_124 v_ArrVal_6456) |c_append_#in~head.base|) |c_append_#in~head.offset|))) (not (= 0 (select (select (store |c_#memory_$Pointer$.offset| v_append_~node~0.base_124 v_ArrVal_6455) |c_append_#in~head.base|) |c_append_#in~head.offset|))) (not (= 0 (select |c_#valid| v_append_~node~0.base_124))))) is different from false [2021-12-18 20:48:38,184 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_append_~node~0.base_124 Int) (v_ArrVal_6456 (Array Int Int)) (v_ArrVal_6455 (Array Int Int))) (or (not (= 0 (select (select (store |c_#memory_$Pointer$.offset| v_append_~node~0.base_124 v_ArrVal_6455) |c_ULTIMATE.start_main_~list2~0#1.base|) |c_ULTIMATE.start_main_~list2~0#1.offset|))) (not (= 0 (select (select (store |c_#memory_$Pointer$.base| v_append_~node~0.base_124 v_ArrVal_6456) |c_ULTIMATE.start_main_~list2~0#1.base|) |c_ULTIMATE.start_main_~list2~0#1.offset|))) (not (= 0 (select |c_#valid| v_append_~node~0.base_124))))) is different from false [2021-12-18 20:48:38,454 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-18 20:48:38,462 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-18 20:48:38,462 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 398 treesize of output 388 [2021-12-18 20:48:38,474 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-18 20:48:38,477 INFO L388 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 378 treesize of output 362 [2021-12-18 20:48:38,484 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-18 20:48:38,493 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-18 20:48:38,493 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 300 treesize of output 292 [2021-12-18 20:48:38,508 INFO L354 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2021-12-18 20:48:38,508 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 12 [2021-12-18 20:48:38,521 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-18 20:48:38,532 INFO L388 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 273 treesize of output 263 [2021-12-18 20:48:38,645 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2021-12-18 20:48:38,648 WARN L234 Elim1Store]: Array PQE input equivalent to true [2021-12-18 20:48:39,686 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-18 20:48:39,688 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 220806 treesize of output 211932 [2021-12-18 20:48:40,306 INFO L388 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 211894 treesize of output 200630 [2021-12-18 20:48:40,917 INFO L388 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 213590 treesize of output 211094 [2021-12-18 20:48:41,702 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-18 20:48:41,703 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 49716 treesize of output 48370 [2021-12-18 20:48:42,543 INFO L388 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 55358 treesize of output 54102 [2021-12-18 20:48:43,393 INFO L388 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 54102 treesize of output 51478 [2021-12-18 20:48:44,260 INFO L354 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2021-12-18 20:48:44,260 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 12 [2021-12-18 20:48:54,074 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2021-12-18 20:48:54,110 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2021-12-18 20:48:54,133 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2021-12-18 20:48:54,385 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2021-12-18 20:48:54,413 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2021-12-18 20:49:09,503 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2021-12-18 20:49:09,516 INFO L354 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2021-12-18 20:49:09,516 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 36 treesize of output 35 [2021-12-18 20:49:09,536 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-18 20:49:09,538 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:49:09,538 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2021-12-18 20:49:09,549 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2021-12-18 20:49:09,584 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-18 20:49:09,585 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 93 treesize of output 97 [2021-12-18 20:49:09,711 INFO L388 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 24 treesize of output 22 [2021-12-18 20:49:09,729 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2021-12-18 20:49:09,747 INFO L354 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2021-12-18 20:49:09,748 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 30 treesize of output 29 [2021-12-18 20:49:09,849 INFO L388 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 135 treesize of output 131 [2021-12-18 20:49:09,853 INFO L388 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 175 treesize of output 173 [2021-12-18 20:49:09,914 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:49:09,921 INFO L388 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 127 treesize of output 123 [2021-12-18 20:49:10,213 INFO L354 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2021-12-18 20:49:10,213 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 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 13 treesize of output 12 [2021-12-18 20:49:10,279 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 45 proven. 9 refuted. 4 times theorem prover too weak. 1 trivial. 6 not checked. [2021-12-18 20:49:10,279 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1061252780] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-18 20:49:10,279 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-18 20:49:10,280 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 20, 19] total 60 [2021-12-18 20:49:10,280 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [262939132] [2021-12-18 20:49:10,280 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-18 20:49:10,280 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 60 states [2021-12-18 20:49:10,280 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-18 20:49:10,280 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2021-12-18 20:49:10,281 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=279, Invalid=2898, Unknown=27, NotChecked=336, Total=3540 [2021-12-18 20:49:10,281 INFO L87 Difference]: Start difference. First operand 248 states and 280 transitions. Second operand has 60 states, 60 states have (on average 2.933333333333333) internal successors, (176), 54 states have internal predecessors, (176), 9 states have call successors, (12), 7 states have call predecessors, (12), 8 states have return successors, (9), 9 states have call predecessors, (9), 6 states have call successors, (9) [2021-12-18 20:49:19,580 WARN L838 $PredicateComparison]: unable to prove that (let ((.cse0 (= (select |c_old(#valid)| c_append_~node~0.base) 0))) (and (not (= c_append_~node~0.base 0)) (= (store |c_old(#valid)| c_append_~node~0.base (select |c_#valid| c_append_~node~0.base)) |c_#valid|) (= |c_append_#in~head.offset| c_append_~head.offset) .cse0 (or (= 0 |c_append_#in~head.base|) (not (= 0 (select |c_#valid| |c_append_#in~head.base|)))) (= (select |c_old(#memory_$Pointer$.offset)| c_append_~head.base) (select |c_#memory_$Pointer$.offset| c_append_~head.base)) (= |c_append_#in~head.base| c_append_~head.base) (or .cse0 (not (= c_append_~node~0.base c_append_~head.base))) (= c_append_~node~0.offset 0) (or (forall ((v_ArrVal_6456 (Array Int Int))) (not (= 0 (select (select (store |c_#memory_$Pointer$.base| c_append_~node~0.base v_ArrVal_6456) c_append_~head.base) c_append_~head.offset)))) (forall ((v_ArrVal_6455 (Array Int Int))) (not (= 0 (select (select (store |c_#memory_$Pointer$.offset| c_append_~node~0.base v_ArrVal_6455) c_append_~head.base) c_append_~head.offset))))))) is different from false [2021-12-18 20:49:19,741 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:49:19,741 INFO L93 Difference]: Finished difference Result 698 states and 789 transitions. [2021-12-18 20:49:19,741 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2021-12-18 20:49:19,742 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 60 states have (on average 2.933333333333333) internal successors, (176), 54 states have internal predecessors, (176), 9 states have call successors, (12), 7 states have call predecessors, (12), 8 states have return successors, (9), 9 states have call predecessors, (9), 6 states have call successors, (9) Word has length 79 [2021-12-18 20:49:19,742 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:49:19,743 INFO L225 Difference]: With dead ends: 698 [2021-12-18 20:49:19,744 INFO L226 Difference]: Without dead ends: 698 [2021-12-18 20:49:19,745 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 294 GetRequests, 158 SyntacticMatches, 16 SemanticMatches, 120 ConstructedPredicates, 4 IntricatePredicates, 0 DeprecatedPredicates, 4064 ImplicationChecksByTransitivity, 11.8s TimeCoverageRelationStatistics Valid=1873, Invalid=11882, Unknown=67, NotChecked=940, Total=14762 [2021-12-18 20:49:19,745 INFO L933 BasicCegarLoop]: 141 mSDtfsCounter, 751 mSDsluCounter, 3320 mSDsCounter, 0 mSdLazyCounter, 2714 mSolverCounterSat, 295 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 751 SdHoareTripleChecker+Valid, 3461 SdHoareTripleChecker+Invalid, 4567 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 295 IncrementalHoareTripleChecker+Valid, 2714 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1558 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2021-12-18 20:49:19,745 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [751 Valid, 3461 Invalid, 4567 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [295 Valid, 2714 Invalid, 0 Unknown, 1558 Unchecked, 1.3s Time] [2021-12-18 20:49:19,746 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 698 states. [2021-12-18 20:49:19,752 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 698 to 305. [2021-12-18 20:49:19,752 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 305 states, 251 states have (on average 1.2231075697211156) internal successors, (307), 272 states have internal predecessors, (307), 21 states have call successors, (21), 8 states have call predecessors, (21), 10 states have return successors, (47), 24 states have call predecessors, (47), 21 states have call successors, (47) [2021-12-18 20:49:19,753 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 305 states to 305 states and 375 transitions. [2021-12-18 20:49:19,754 INFO L78 Accepts]: Start accepts. Automaton has 305 states and 375 transitions. Word has length 79 [2021-12-18 20:49:19,754 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:49:19,754 INFO L470 AbstractCegarLoop]: Abstraction has 305 states and 375 transitions. [2021-12-18 20:49:19,754 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 60 states, 60 states have (on average 2.933333333333333) internal successors, (176), 54 states have internal predecessors, (176), 9 states have call successors, (12), 7 states have call predecessors, (12), 8 states have return successors, (9), 9 states have call predecessors, (9), 6 states have call successors, (9) [2021-12-18 20:49:19,754 INFO L276 IsEmpty]: Start isEmpty. Operand 305 states and 375 transitions. [2021-12-18 20:49:19,755 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-12-18 20:49:19,755 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:49:19,755 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 20:49:19,783 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-12-18 20:49:19,980 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32,23 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-18 20:49:19,981 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting appendErr23REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 55 more)] === [2021-12-18 20:49:19,981 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:49:19,981 INFO L85 PathProgramCache]: Analyzing trace with hash 994738747, now seen corresponding path program 1 times [2021-12-18 20:49:19,981 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-18 20:49:19,981 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1858755424] [2021-12-18 20:49:19,981 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:49:19,981 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-18 20:49:20,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:49:20,126 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2021-12-18 20:49:20,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:49:20,177 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2021-12-18 20:49:20,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:49:20,197 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 48 [2021-12-18 20:49:20,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:49:20,370 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 15 proven. 37 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-12-18 20:49:20,370 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-18 20:49:20,370 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1858755424] [2021-12-18 20:49:20,370 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1858755424] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 20:49:20,371 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [808401570] [2021-12-18 20:49:20,371 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:49:20,371 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-18 20:49:20,371 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-18 20:49:20,372 INFO L229 MonitoredProcess]: Starting monitored process 24 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-18 20:49:20,372 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-12-18 20:49:20,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:49:20,743 INFO L263 TraceCheckSpWp]: Trace formula consists of 679 conjuncts, 59 conjunts are in the unsatisfiable core [2021-12-18 20:49:20,746 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:49:20,753 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:49:20,891 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-12-18 20:49:20,891 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 17 treesize of output 21 [2021-12-18 20:49:21,017 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-12-18 20:49:21,017 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 17 treesize of output 21 [2021-12-18 20:49:21,152 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-12-18 20:49:21,193 INFO L354 Elim1Store]: treesize reduction 21, result has 25.0 percent of original size [2021-12-18 20:49:21,193 INFO L388 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 1 case distinctions, treesize of input 21 treesize of output 20 [2021-12-18 20:49:21,231 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-18 20:49:21,231 INFO L388 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 1 case distinctions, treesize of input 23 treesize of output 27 [2021-12-18 20:49:21,236 INFO L354 Elim1Store]: treesize reduction 9, result has 10.0 percent of original size [2021-12-18 20:49:21,236 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 7 [2021-12-18 20:49:21,291 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-18 20:49:21,291 INFO L388 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 1 case distinctions, treesize of input 28 treesize of output 32 [2021-12-18 20:49:21,358 INFO L354 Elim1Store]: treesize reduction 4, result has 66.7 percent of original size [2021-12-18 20:49:21,358 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 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 15 treesize of output 15 [2021-12-18 20:49:21,443 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-18 20:49:21,443 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2021-12-18 20:49:21,478 INFO L388 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 34 treesize of output 30 [2021-12-18 20:49:21,506 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-18 20:49:21,507 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 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 35 treesize of output 15 [2021-12-18 20:49:21,525 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 15 proven. 35 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-12-18 20:49:21,525 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 20:49:21,549 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_6870 (Array Int Int))) (not (= (select (select (store |c_#memory_$Pointer$.base| c_append_~node~0.base v_ArrVal_6870) c_append_~head.base) c_append_~head.offset) 0))) is different from false [2021-12-18 20:49:21,556 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_append_~node~0.base_136 Int) (v_ArrVal_6870 (Array Int Int))) (or (not (= (select (select (store |c_#memory_$Pointer$.base| v_append_~node~0.base_136 v_ArrVal_6870) |c_append_#in~head.base|) |c_append_#in~head.offset|) 0)) (not (= 0 (select |c_#valid| v_append_~node~0.base_136))))) is different from false [2021-12-18 20:49:21,564 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_append_~node~0.base_136 Int) (v_ArrVal_6870 (Array Int Int))) (or (not (= (select (select (store |c_#memory_$Pointer$.base| v_append_~node~0.base_136 v_ArrVal_6870) |c_ULTIMATE.start_main_~list2~0#1.base|) |c_ULTIMATE.start_main_~list2~0#1.offset|) 0)) (not (= 0 (select |c_#valid| v_append_~node~0.base_136))))) is different from false [2021-12-18 20:49:21,642 INFO L354 Elim1Store]: treesize reduction 21, result has 47.5 percent of original size [2021-12-18 20:49:21,642 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 33 [2021-12-18 20:49:21,643 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-18 20:49:21,646 INFO L354 Elim1Store]: treesize reduction 9, result has 10.0 percent of original size [2021-12-18 20:49:21,646 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 64 treesize of output 34 [2021-12-18 20:49:21,648 INFO L388 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 20 treesize of output 18 [2021-12-18 20:49:21,656 INFO L354 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2021-12-18 20:49:21,657 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 12 [2021-12-18 20:49:21,830 INFO L354 Elim1Store]: treesize reduction 21, result has 47.5 percent of original size [2021-12-18 20:49:21,830 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 33 [2021-12-18 20:49:21,851 INFO L354 Elim1Store]: treesize reduction 10, result has 71.4 percent of original size [2021-12-18 20:49:21,859 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 75 treesize of output 85 [2021-12-18 20:49:21,867 INFO L388 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 52 treesize of output 48 [2021-12-18 20:49:21,870 INFO L388 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 48 treesize of output 46 [2021-12-18 20:49:22,173 INFO L354 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2021-12-18 20:49:22,173 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 12 [2021-12-18 20:49:22,741 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 13 proven. 31 refuted. 0 times theorem prover too weak. 12 trivial. 8 not checked. [2021-12-18 20:49:22,741 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [808401570] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-18 20:49:22,741 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-18 20:49:22,741 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 17, 16] total 43 [2021-12-18 20:49:22,741 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [565109996] [2021-12-18 20:49:22,741 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-18 20:49:22,742 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2021-12-18 20:49:22,742 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-18 20:49:22,742 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-12-18 20:49:22,743 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=178, Invalid=1385, Unknown=9, NotChecked=234, Total=1806 [2021-12-18 20:49:22,743 INFO L87 Difference]: Start difference. First operand 305 states and 375 transitions. Second operand has 43 states, 43 states have (on average 3.953488372093023) internal successors, (170), 37 states have internal predecessors, (170), 7 states have call successors, (10), 7 states have call predecessors, (10), 6 states have return successors, (7), 6 states have call predecessors, (7), 4 states have call successors, (7) [2021-12-18 20:49:24,323 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:49:24,323 INFO L93 Difference]: Finished difference Result 437 states and 490 transitions. [2021-12-18 20:49:24,323 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-12-18 20:49:24,324 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 3.953488372093023) internal successors, (170), 37 states have internal predecessors, (170), 7 states have call successors, (10), 7 states have call predecessors, (10), 6 states have return successors, (7), 6 states have call predecessors, (7), 4 states have call successors, (7) Word has length 80 [2021-12-18 20:49:24,324 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:49:24,325 INFO L225 Difference]: With dead ends: 437 [2021-12-18 20:49:24,325 INFO L226 Difference]: Without dead ends: 437 [2021-12-18 20:49:24,326 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 215 GetRequests, 137 SyntacticMatches, 17 SemanticMatches, 61 ConstructedPredicates, 3 IntricatePredicates, 0 DeprecatedPredicates, 1240 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=553, Invalid=2958, Unknown=41, NotChecked=354, Total=3906 [2021-12-18 20:49:24,326 INFO L933 BasicCegarLoop]: 85 mSDtfsCounter, 473 mSDsluCounter, 1148 mSDsCounter, 0 mSdLazyCounter, 951 mSolverCounterSat, 80 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 473 SdHoareTripleChecker+Valid, 1233 SdHoareTripleChecker+Invalid, 2222 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 80 IncrementalHoareTripleChecker+Valid, 951 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1191 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-12-18 20:49:24,326 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [473 Valid, 1233 Invalid, 2222 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [80 Valid, 951 Invalid, 0 Unknown, 1191 Unchecked, 0.5s Time] [2021-12-18 20:49:24,327 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 437 states. [2021-12-18 20:49:24,331 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 437 to 305. [2021-12-18 20:49:24,331 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 305 states, 254 states have (on average 1.2125984251968505) internal successors, (308), 277 states have internal predecessors, (308), 17 states have call successors, (17), 9 states have call predecessors, (17), 11 states have return successors, (31), 18 states have call predecessors, (31), 17 states have call successors, (31) [2021-12-18 20:49:24,332 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 305 states to 305 states and 356 transitions. [2021-12-18 20:49:24,333 INFO L78 Accepts]: Start accepts. Automaton has 305 states and 356 transitions. Word has length 80 [2021-12-18 20:49:24,333 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:49:24,333 INFO L470 AbstractCegarLoop]: Abstraction has 305 states and 356 transitions. [2021-12-18 20:49:24,333 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 3.953488372093023) internal successors, (170), 37 states have internal predecessors, (170), 7 states have call successors, (10), 7 states have call predecessors, (10), 6 states have return successors, (7), 6 states have call predecessors, (7), 4 states have call successors, (7) [2021-12-18 20:49:24,333 INFO L276 IsEmpty]: Start isEmpty. Operand 305 states and 356 transitions. [2021-12-18 20:49:24,334 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-12-18 20:49:24,334 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:49:24,334 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 20:49:24,354 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2021-12-18 20:49:24,543 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33,24 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-18 20:49:24,543 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting appendErr22REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 55 more)] === [2021-12-18 20:49:24,544 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:49:24,544 INFO L85 PathProgramCache]: Analyzing trace with hash -233094045, now seen corresponding path program 3 times [2021-12-18 20:49:24,544 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-18 20:49:24,544 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [550346803] [2021-12-18 20:49:24,544 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:49:24,544 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-18 20:49:24,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:49:24,836 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2021-12-18 20:49:24,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:49:26,239 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2021-12-18 20:49:26,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:49:28,342 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 47 [2021-12-18 20:49:28,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:49:31,048 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 15 proven. 47 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-12-18 20:49:31,048 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-18 20:49:31,048 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [550346803] [2021-12-18 20:49:31,048 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [550346803] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 20:49:31,049 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1942110657] [2021-12-18 20:49:31,049 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-18 20:49:31,049 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-18 20:49:31,049 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-18 20:49:31,052 INFO L229 MonitoredProcess]: Starting monitored process 25 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-18 20:49:31,053 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-12-18 20:49:32,109 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-12-18 20:49:32,109 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-18 20:49:32,115 INFO L263 TraceCheckSpWp]: Trace formula consists of 679 conjuncts, 147 conjunts are in the unsatisfiable core [2021-12-18 20:49:32,122 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:49:32,128 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:49:32,155 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-12-18 20:49:32,155 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 17 treesize of output 21 [2021-12-18 20:49:32,218 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-12-18 20:49:32,223 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-12-18 20:49:32,289 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:49:32,289 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 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 [2021-12-18 20:49:32,294 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:49:32,294 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 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 [2021-12-18 20:49:32,760 INFO L388 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 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 17 [2021-12-18 20:49:33,164 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:49:33,165 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:49:33,165 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 25 [2021-12-18 20:49:33,169 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:49:33,170 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:49:33,170 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 25 [2021-12-18 20:49:33,189 INFO L354 Elim1Store]: treesize reduction 65, result has 28.6 percent of original size [2021-12-18 20:49:33,189 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 34 treesize of output 46 [2021-12-18 20:49:34,427 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:49:34,430 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:49:34,431 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:49:34,474 INFO L354 Elim1Store]: treesize reduction 86, result has 31.2 percent of original size [2021-12-18 20:49:34,475 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 116 treesize of output 127 [2021-12-18 20:49:34,482 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:49:34,483 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:49:34,484 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:49:34,485 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:49:34,495 INFO L354 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2021-12-18 20:49:34,495 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 7 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 24 treesize of output 38 [2021-12-18 20:49:34,501 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-18 20:49:34,502 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 121 treesize of output 80 [2021-12-18 20:49:34,510 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-18 20:49:34,526 INFO L354 Elim1Store]: treesize reduction 49, result has 34.7 percent of original size [2021-12-18 20:49:34,526 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 4 case distinctions, treesize of input 34 treesize of output 46 [2021-12-18 20:49:34,568 INFO L354 Elim1Store]: treesize reduction 13, result has 7.1 percent of original size [2021-12-18 20:49:34,569 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 1 case distinctions, treesize of input 52 treesize of output 36 [2021-12-18 20:49:35,553 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:49:35,555 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:49:35,556 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:49:35,575 INFO L354 Elim1Store]: treesize reduction 42, result has 27.6 percent of original size [2021-12-18 20:49:35,576 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 71 treesize of output 70 [2021-12-18 20:49:35,581 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:49:35,584 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:49:35,585 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:49:35,586 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:49:35,586 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:49:35,587 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 8 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 28 [2021-12-18 20:49:35,593 INFO L388 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 26 treesize of output 14 [2021-12-18 20:49:35,625 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-12-18 20:49:35,625 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 27 treesize of output 45 [2021-12-18 20:49:42,126 INFO L354 Elim1Store]: treesize reduction 16, result has 51.5 percent of original size [2021-12-18 20:49:42,127 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 5 select indices, 5 select index equivalence classes, 6 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 26 treesize of output 32 [2021-12-18 20:49:42,198 INFO L388 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 [2021-12-18 20:49:42,201 INFO L388 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 [2021-12-18 20:49:42,261 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-12-18 20:49:42,263 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-12-18 20:49:42,282 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 32 proven. 39 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-18 20:49:42,282 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 20:49:42,317 WARN L838 $PredicateComparison]: unable to prove that (and (forall ((v_ArrVal_7315 (Array Int Int))) (= (select (select (store |c_#memory_$Pointer$.base| c_append_~node~0.base v_ArrVal_7315) c_append_~head.base) c_append_~head.offset) 0)) (forall ((v_ArrVal_7314 (Array Int Int))) (= (select (select (store |c_#memory_$Pointer$.offset| c_append_~node~0.base v_ArrVal_7314) c_append_~head.base) c_append_~head.offset) 0))) is different from false [2021-12-18 20:49:58,890 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1942110657] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 20:49:58,890 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-18 20:49:58,890 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 33] total 57 [2021-12-18 20:49:58,890 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1689449032] [2021-12-18 20:49:58,890 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-18 20:49:58,891 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 57 states [2021-12-18 20:49:58,891 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-18 20:49:58,891 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2021-12-18 20:49:58,892 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=264, Invalid=3195, Unknown=85, NotChecked=116, Total=3660 [2021-12-18 20:49:58,892 INFO L87 Difference]: Start difference. First operand 305 states and 356 transitions. Second operand has 57 states, 57 states have (on average 2.280701754385965) internal successors, (130), 53 states have internal predecessors, (130), 7 states have call successors, (7), 4 states have call predecessors, (7), 6 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2021-12-18 20:50:08,964 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:50:08,964 INFO L93 Difference]: Finished difference Result 289 states and 333 transitions. [2021-12-18 20:50:08,965 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-12-18 20:50:08,965 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 57 states have (on average 2.280701754385965) internal successors, (130), 53 states have internal predecessors, (130), 7 states have call successors, (7), 4 states have call predecessors, (7), 6 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) Word has length 81 [2021-12-18 20:50:08,965 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:50:08,966 INFO L225 Difference]: With dead ends: 289 [2021-12-18 20:50:08,966 INFO L226 Difference]: Without dead ends: 289 [2021-12-18 20:50:08,967 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 180 GetRequests, 79 SyntacticMatches, 17 SemanticMatches, 84 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 2221 ImplicationChecksByTransitivity, 35.7s TimeCoverageRelationStatistics Valid=657, Invalid=6257, Unknown=230, NotChecked=166, Total=7310 [2021-12-18 20:50:08,967 INFO L933 BasicCegarLoop]: 99 mSDtfsCounter, 127 mSDsluCounter, 1728 mSDsCounter, 0 mSdLazyCounter, 844 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 127 SdHoareTripleChecker+Valid, 1827 SdHoareTripleChecker+Invalid, 1669 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 844 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 802 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-12-18 20:50:08,968 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [127 Valid, 1827 Invalid, 1669 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 844 Invalid, 0 Unknown, 802 Unchecked, 0.9s Time] [2021-12-18 20:50:08,968 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 289 states. [2021-12-18 20:50:08,971 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 289 to 288. [2021-12-18 20:50:08,972 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 288 states, 240 states have (on average 1.2125) internal successors, (291), 262 states have internal predecessors, (291), 15 states have call successors, (15), 9 states have call predecessors, (15), 10 states have return successors, (26), 16 states have call predecessors, (26), 15 states have call successors, (26) [2021-12-18 20:50:08,973 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 288 states to 288 states and 332 transitions. [2021-12-18 20:50:08,973 INFO L78 Accepts]: Start accepts. Automaton has 288 states and 332 transitions. Word has length 81 [2021-12-18 20:50:08,973 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:50:08,973 INFO L470 AbstractCegarLoop]: Abstraction has 288 states and 332 transitions. [2021-12-18 20:50:08,973 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 57 states, 57 states have (on average 2.280701754385965) internal successors, (130), 53 states have internal predecessors, (130), 7 states have call successors, (7), 4 states have call predecessors, (7), 6 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2021-12-18 20:50:08,974 INFO L276 IsEmpty]: Start isEmpty. Operand 288 states and 332 transitions. [2021-12-18 20:50:08,974 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-12-18 20:50:08,974 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:50:08,975 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 20:50:09,002 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2021-12-18 20:50:09,194 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34,25 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-18 20:50:09,194 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting appendErr22REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 55 more)] === [2021-12-18 20:50:09,194 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:50:09,194 INFO L85 PathProgramCache]: Analyzing trace with hash 1696190470, now seen corresponding path program 4 times [2021-12-18 20:50:09,194 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-18 20:50:09,195 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [570196272] [2021-12-18 20:50:09,195 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:50:09,195 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-18 20:50:09,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:50:09,567 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2021-12-18 20:50:09,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:50:11,137 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2021-12-18 20:50:11,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:50:15,307 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 47 [2021-12-18 20:50:15,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:50:20,373 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 12 proven. 57 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-12-18 20:50:20,373 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-18 20:50:20,374 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [570196272] [2021-12-18 20:50:20,374 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [570196272] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 20:50:20,374 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [170515109] [2021-12-18 20:50:20,374 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-18 20:50:20,374 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-18 20:50:20,375 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-18 20:50:20,375 INFO L229 MonitoredProcess]: Starting monitored process 26 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-18 20:50:20,376 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2021-12-18 20:50:20,790 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-18 20:50:20,791 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-18 20:50:20,795 INFO L263 TraceCheckSpWp]: Trace formula consists of 646 conjuncts, 136 conjunts are in the unsatisfiable core [2021-12-18 20:50:20,803 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:50:20,808 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:50:20,886 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-12-18 20:50:20,886 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 17 treesize of output 21 [2021-12-18 20:50:20,970 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-12-18 20:50:20,975 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-12-18 20:50:21,554 INFO L388 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 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 17 [2021-12-18 20:50:24,040 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:50:24,041 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:50:24,042 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 27 [2021-12-18 20:50:24,046 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:50:24,046 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:50:24,047 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 27 [2021-12-18 20:50:24,067 INFO L354 Elim1Store]: treesize reduction 65, result has 28.6 percent of original size [2021-12-18 20:50:24,067 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 34 treesize of output 46 [2021-12-18 20:50:25,099 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:50:25,101 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:50:25,102 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:50:25,145 INFO L354 Elim1Store]: treesize reduction 86, result has 31.2 percent of original size [2021-12-18 20:50:25,145 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 118 treesize of output 129 [2021-12-18 20:50:25,152 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:50:25,153 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:50:25,155 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:50:25,155 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:50:25,165 INFO L354 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2021-12-18 20:50:25,165 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 7 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 26 treesize of output 40 [2021-12-18 20:50:25,170 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-18 20:50:25,172 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 121 treesize of output 80 [2021-12-18 20:50:25,196 INFO L354 Elim1Store]: treesize reduction 81, result has 24.3 percent of original size [2021-12-18 20:50:25,196 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 4 case distinctions, treesize of input 42 treesize of output 35 [2021-12-18 20:50:25,239 INFO L354 Elim1Store]: treesize reduction 13, result has 7.1 percent of original size [2021-12-18 20:50:25,239 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 1 case distinctions, treesize of input 61 treesize of output 45 [2021-12-18 20:50:28,294 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:50:28,296 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:50:28,296 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:50:28,317 INFO L354 Elim1Store]: treesize reduction 38, result has 34.5 percent of original size [2021-12-18 20:50:28,317 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 66 treesize of output 71 [2021-12-18 20:50:28,323 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:50:28,324 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:50:28,332 INFO L354 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2021-12-18 20:50:28,333 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 5 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 26 treesize of output 40 [2021-12-18 20:50:28,337 INFO L388 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 43 treesize of output 27 [2021-12-18 20:50:28,359 INFO L354 Elim1Store]: treesize reduction 40, result has 32.2 percent of original size [2021-12-18 20:50:28,359 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 4 case distinctions, treesize of input 24 treesize of output 28 [2021-12-18 20:50:28,651 INFO L354 Elim1Store]: treesize reduction 8, result has 52.9 percent of original size [2021-12-18 20:50:28,651 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 2 case distinctions, treesize of input 16 treesize of output 18 [2021-12-18 20:50:28,750 INFO L388 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 16 treesize of output 18 [2021-12-18 20:50:28,755 INFO L388 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 16 treesize of output 18 [2021-12-18 20:50:29,002 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-18 20:50:29,003 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 7 [2021-12-18 20:50:29,005 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-18 20:50:29,006 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-18 20:50:29,006 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 10 [2021-12-18 20:50:29,163 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 27 proven. 44 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-12-18 20:50:29,163 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 20:50:51,610 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [170515109] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 20:50:51,610 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-18 20:50:51,610 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32] total 60 [2021-12-18 20:50:51,611 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [346975298] [2021-12-18 20:50:51,611 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-18 20:50:51,611 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 60 states [2021-12-18 20:50:51,611 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-18 20:50:51,611 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2021-12-18 20:50:51,612 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=274, Invalid=3910, Unknown=106, NotChecked=0, Total=4290 [2021-12-18 20:50:51,612 INFO L87 Difference]: Start difference. First operand 288 states and 332 transitions. Second operand has 60 states, 60 states have (on average 2.316666666666667) internal successors, (139), 56 states have internal predecessors, (139), 7 states have call successors, (7), 4 states have call predecessors, (7), 6 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2021-12-18 20:50:58,349 WARN L860 $PredicateComparison]: unable to prove that (and (= 1 (select |c_#valid| |c_append_#in~head.base|)) (<= 0 |c_append_#in~head.offset|) (exists ((v_ArrVal_7751 (Array Int Int)) (v_DerPreprocessor_21 (Array Int Int)) (v_ArrVal_7748 (Array Int Int)) (v_ArrVal_7749 (Array Int Int)) (append_~node~0.base Int) (v_DerPreprocessor_22 (Array Int Int))) (let ((.cse2 (store |c_old(#memory_$Pointer$.base)| append_~node~0.base v_DerPreprocessor_21)) (.cse1 (+ |c_append_#in~head.offset| 4))) (let ((.cse3 (select (select .cse2 |c_append_#in~head.base|) .cse1))) (and (= (store |c_old(#valid)| append_~node~0.base (select |c_#valid| append_~node~0.base)) |c_#valid|) (= (select |c_old(#valid)| append_~node~0.base) 0) (= |c_#memory_$Pointer$.base| (let ((.cse0 (store .cse2 .cse3 v_ArrVal_7748))) (store .cse0 |c_append_#in~head.base| (store (select .cse0 |c_append_#in~head.base|) .cse1 append_~node~0.base)))) (= |c_#memory_$Pointer$.offset| (store (store (store |c_old(#memory_$Pointer$.offset)| append_~node~0.base v_DerPreprocessor_22) .cse3 v_ArrVal_7749) |c_append_#in~head.base| v_ArrVal_7751)))))) (or (let ((.cse14 (@diff |c_old(#memory_$Pointer$.offset)| |c_#memory_$Pointer$.offset|))) (let ((.cse18 (select |c_#memory_$Pointer$.offset| .cse14))) (let ((.cse44 (store |c_old(#memory_$Pointer$.offset)| .cse14 .cse18))) (let ((.cse9 (@diff .cse44 |c_#memory_$Pointer$.offset|))) (let ((.cse13 (select |c_#memory_$Pointer$.offset| .cse9))) (let ((.cse35 (store .cse44 .cse9 .cse13)) (.cse37 (@diff |c_old(#memory_$Pointer$.base)| |c_#memory_$Pointer$.base|))) (let ((.cse22 (store |c_old(#memory_$Pointer$.base)| .cse37 (select |c_#memory_$Pointer$.base| .cse37))) (.cse30 (@diff .cse35 |c_#memory_$Pointer$.offset|))) (let ((.cse34 (select |c_#memory_$Pointer$.offset| .cse30)) (.cse23 (@diff .cse22 |c_#memory_$Pointer$.base|))) (let ((.cse41 (store .cse22 .cse23 (select |c_#memory_$Pointer$.base| .cse23))) (.cse43 (store .cse35 .cse30 .cse34))) (let ((.cse4 (@diff .cse43 |c_#memory_$Pointer$.offset|)) (.cse42 (@diff .cse41 |c_#memory_$Pointer$.base|))) (let ((.cse39 (store .cse41 .cse42 (select |c_#memory_$Pointer$.base| .cse42))) (.cse8 (select |c_#memory_$Pointer$.offset| .cse4))) (let ((.cse36 (store .cse43 .cse4 .cse8)) (.cse38 (@diff .cse39 |c_#memory_$Pointer$.base|))) (let ((.cse20 (store .cse39 .cse38 (select |c_#memory_$Pointer$.base| .cse38))) (.cse40 (+ |c_append_#in~head.offset| 4)) (.cse24 (@diff .cse36 |c_#memory_$Pointer$.offset|))) (let ((.cse29 (@diff |c_old(#valid)| |c_#valid|)) (.cse26 (select |c_#memory_$Pointer$.offset| .cse24)) (.cse21 (select (select |c_old(#memory_$Pointer$.base)| |c_append_#in~head.base|) .cse40)) (.cse19 (@diff .cse20 |c_#memory_$Pointer$.base|))) (and (or (= (select |c_old(#valid)| .cse4) 0) (= |c_append_#in~head.base| .cse4) (let ((.cse5 (select |c_old(#memory_$Pointer$.offset)| .cse4))) (let ((.cse6 (@diff .cse5 .cse8))) (let ((.cse7 (select .cse8 .cse6))) (and (= (store .cse5 .cse6 .cse7) .cse8) (or (= .cse7 0) (= .cse5 .cse8))))))) (or (= |c_append_#in~head.base| .cse9) (= (select |c_old(#valid)| .cse9) 0) (let ((.cse10 (select |c_old(#memory_$Pointer$.offset)| .cse9))) (let ((.cse11 (@diff .cse10 .cse13))) (let ((.cse12 (select .cse13 .cse11))) (and (= (store .cse10 .cse11 .cse12) .cse13) (or (= .cse12 0) (= .cse10 .cse13))))))) (or (= (select |c_old(#valid)| .cse14) 0) (= |c_append_#in~head.base| .cse14) (let ((.cse15 (select |c_old(#memory_$Pointer$.offset)| .cse14))) (let ((.cse16 (@diff .cse15 .cse18))) (let ((.cse17 (select .cse18 .cse16))) (and (= (store .cse15 .cse16 .cse17) .cse18) (or (= .cse17 0) (= .cse15 .cse18))))))) (or (= |c_append_#in~head.base| .cse19) (= (select |c_old(#valid)| .cse19) 0) (= .cse20 |c_#memory_$Pointer$.base|) (= .cse19 .cse21)) (or (= .cse22 |c_#memory_$Pointer$.base|) (= |c_append_#in~head.base| .cse23) (= .cse23 .cse21) (= (select |c_old(#valid)| .cse23) 0)) (or (= (select |c_old(#valid)| .cse24) 0) (let ((.cse25 (select |c_old(#memory_$Pointer$.offset)| .cse24))) (let ((.cse28 (@diff .cse25 .cse26))) (let ((.cse27 (select .cse26 .cse28))) (and (or (= .cse25 .cse26) (= .cse27 0)) (= (store .cse25 .cse28 .cse27) .cse26))))) (= |c_append_#in~head.base| .cse24)) (or (= (select |c_old(#valid)| .cse29) 0) (= |c_old(#valid)| |c_#valid|)) (or (= |c_append_#in~head.base| .cse30) (let ((.cse31 (select |c_old(#memory_$Pointer$.offset)| .cse30))) (let ((.cse32 (@diff .cse31 .cse34))) (let ((.cse33 (select .cse34 .cse32))) (and (= (store .cse31 .cse32 .cse33) .cse34) (= .cse33 0))))) (= (select |c_old(#valid)| .cse30) 0) (= .cse35 |c_#memory_$Pointer$.offset|)) (= (store |c_old(#valid)| .cse29 (select |c_#valid| .cse29)) |c_#valid|) (= (store .cse36 .cse24 .cse26) |c_#memory_$Pointer$.offset|) (or (= |c_old(#memory_$Pointer$.base)| |c_#memory_$Pointer$.base|) (= (select |c_old(#valid)| .cse37) 0) (= .cse37 .cse21) (= |c_append_#in~head.base| .cse37)) (or (= |c_append_#in~head.base| .cse38) (= .cse38 .cse21) (= .cse39 |c_#memory_$Pointer$.base|) (= (select |c_old(#valid)| .cse38) 0)) (= (select |c_old(#valid)| (select (select |c_#memory_$Pointer$.base| |c_append_#in~head.base|) .cse40)) 0) (or (= .cse41 |c_#memory_$Pointer$.base|) (= (select |c_old(#valid)| .cse42) 0) (= .cse42 .cse21) (= |c_append_#in~head.base| .cse42)) (= (store .cse20 .cse19 (select |c_#memory_$Pointer$.base| .cse19)) |c_#memory_$Pointer$.base|)))))))))))))))) (= (select |c_old(#valid)| |c_append_#in~head.base|) 0))) is different from true [2021-12-18 20:50:59,083 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:50:59,084 INFO L93 Difference]: Finished difference Result 212 states and 236 transitions. [2021-12-18 20:50:59,084 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-12-18 20:50:59,085 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 60 states have (on average 2.316666666666667) internal successors, (139), 56 states have internal predecessors, (139), 7 states have call successors, (7), 4 states have call predecessors, (7), 6 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) Word has length 83 [2021-12-18 20:50:59,085 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:50:59,085 INFO L225 Difference]: With dead ends: 212 [2021-12-18 20:50:59,086 INFO L226 Difference]: Without dead ends: 212 [2021-12-18 20:50:59,086 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 165 GetRequests, 74 SyntacticMatches, 11 SemanticMatches, 80 ConstructedPredicates, 1 IntricatePredicates, 2 DeprecatedPredicates, 1944 ImplicationChecksByTransitivity, 38.1s TimeCoverageRelationStatistics Valid=455, Invalid=5852, Unknown=177, NotChecked=158, Total=6642 [2021-12-18 20:50:59,087 INFO L933 BasicCegarLoop]: 80 mSDtfsCounter, 118 mSDsluCounter, 1739 mSDsCounter, 0 mSdLazyCounter, 802 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 118 SdHoareTripleChecker+Valid, 1819 SdHoareTripleChecker+Invalid, 1492 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 802 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 660 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2021-12-18 20:50:59,087 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [118 Valid, 1819 Invalid, 1492 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 802 Invalid, 0 Unknown, 660 Unchecked, 1.2s Time] [2021-12-18 20:50:59,087 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 212 states. [2021-12-18 20:50:59,089 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 212 to 162. [2021-12-18 20:50:59,090 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 162 states, 131 states have (on average 1.3053435114503817) internal successors, (171), 152 states have internal predecessors, (171), 6 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (6), 5 states have call predecessors, (6), 6 states have call successors, (6) [2021-12-18 20:50:59,090 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 183 transitions. [2021-12-18 20:50:59,090 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 183 transitions. Word has length 83 [2021-12-18 20:50:59,091 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:50:59,091 INFO L470 AbstractCegarLoop]: Abstraction has 162 states and 183 transitions. [2021-12-18 20:50:59,091 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 60 states, 60 states have (on average 2.316666666666667) internal successors, (139), 56 states have internal predecessors, (139), 7 states have call successors, (7), 4 states have call predecessors, (7), 6 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2021-12-18 20:50:59,091 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 183 transitions. [2021-12-18 20:50:59,092 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2021-12-18 20:50:59,092 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:50:59,092 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 20:50:59,119 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2021-12-18 20:50:59,318 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2021-12-18 20:50:59,318 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 55 more)] === [2021-12-18 20:50:59,319 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:50:59,319 INFO L85 PathProgramCache]: Analyzing trace with hash 1916147551, now seen corresponding path program 1 times [2021-12-18 20:50:59,319 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-18 20:50:59,319 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1724287384] [2021-12-18 20:50:59,319 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:50:59,319 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-18 20:50:59,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:50:59,403 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2021-12-18 20:50:59,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:50:59,412 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 28 [2021-12-18 20:50:59,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:50:59,421 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 45 [2021-12-18 20:50:59,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:50:59,431 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 64 [2021-12-18 20:50:59,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:50:59,442 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 83 [2021-12-18 20:50:59,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:50:59,452 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2021-12-18 20:50:59,452 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-18 20:50:59,452 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1724287384] [2021-12-18 20:50:59,452 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1724287384] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 20:50:59,452 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [297700940] [2021-12-18 20:50:59,452 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:50:59,453 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-18 20:50:59,453 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-18 20:50:59,456 INFO L229 MonitoredProcess]: Starting monitored process 27 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-18 20:50:59,485 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2021-12-18 20:50:59,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:50:59,910 INFO L263 TraceCheckSpWp]: Trace formula consists of 860 conjuncts, 6 conjunts are in the unsatisfiable core [2021-12-18 20:50:59,912 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:51:00,076 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2021-12-18 20:51:00,076 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 20:51:00,216 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2021-12-18 20:51:00,216 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [297700940] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-18 20:51:00,216 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-18 20:51:00,216 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 7] total 9 [2021-12-18 20:51:00,216 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1125843172] [2021-12-18 20:51:00,216 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-18 20:51:00,217 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-12-18 20:51:00,218 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-18 20:51:00,218 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-12-18 20:51:00,218 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2021-12-18 20:51:00,218 INFO L87 Difference]: Start difference. First operand 162 states and 183 transitions. Second operand has 9 states, 9 states have (on average 5.444444444444445) internal successors, (49), 8 states have internal predecessors, (49), 6 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-12-18 20:51:00,299 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:51:00,299 INFO L93 Difference]: Finished difference Result 192 states and 199 transitions. [2021-12-18 20:51:00,299 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-12-18 20:51:00,300 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 5.444444444444445) internal successors, (49), 8 states have internal predecessors, (49), 6 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) Word has length 103 [2021-12-18 20:51:00,300 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:51:00,300 INFO L225 Difference]: With dead ends: 192 [2021-12-18 20:51:00,300 INFO L226 Difference]: Without dead ends: 192 [2021-12-18 20:51:00,300 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 221 GetRequests, 213 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2021-12-18 20:51:00,301 INFO L933 BasicCegarLoop]: 93 mSDtfsCounter, 71 mSDsluCounter, 388 mSDsCounter, 0 mSdLazyCounter, 101 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 72 SdHoareTripleChecker+Valid, 481 SdHoareTripleChecker+Invalid, 116 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 101 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-18 20:51:00,301 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [72 Valid, 481 Invalid, 116 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 101 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-18 20:51:00,301 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 192 states. [2021-12-18 20:51:00,303 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 192 to 172. [2021-12-18 20:51:00,303 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 172 states, 140 states have (on average 1.3214285714285714) internal successors, (185), 161 states have internal predecessors, (185), 7 states have call successors, (7), 4 states have call predecessors, (7), 4 states have return successors, (7), 6 states have call predecessors, (7), 7 states have call successors, (7) [2021-12-18 20:51:00,304 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 172 states to 172 states and 199 transitions. [2021-12-18 20:51:00,304 INFO L78 Accepts]: Start accepts. Automaton has 172 states and 199 transitions. Word has length 103 [2021-12-18 20:51:00,304 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:51:00,304 INFO L470 AbstractCegarLoop]: Abstraction has 172 states and 199 transitions. [2021-12-18 20:51:00,304 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 5.444444444444445) internal successors, (49), 8 states have internal predecessors, (49), 6 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-12-18 20:51:00,304 INFO L276 IsEmpty]: Start isEmpty. Operand 172 states and 199 transitions. [2021-12-18 20:51:00,305 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2021-12-18 20:51:00,305 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:51:00,306 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 20:51:00,332 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2021-12-18 20:51:00,519 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2021-12-18 20:51:00,519 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 55 more)] === [2021-12-18 20:51:00,520 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:51:00,520 INFO L85 PathProgramCache]: Analyzing trace with hash -396688173, now seen corresponding path program 2 times [2021-12-18 20:51:00,520 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-18 20:51:00,520 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1346564569] [2021-12-18 20:51:00,520 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:51:00,520 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-18 20:51:00,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:51:00,722 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2021-12-18 20:51:00,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:51:00,798 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 28 [2021-12-18 20:51:00,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:51:00,853 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 45 [2021-12-18 20:51:00,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:51:00,878 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 64 [2021-12-18 20:51:00,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:51:00,908 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 83 [2021-12-18 20:51:00,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:51:00,965 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 102 [2021-12-18 20:51:00,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:51:01,033 INFO L134 CoverageAnalysis]: Checked inductivity of 209 backedges. 0 proven. 150 refuted. 0 times theorem prover too weak. 59 trivial. 0 not checked. [2021-12-18 20:51:01,033 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-18 20:51:01,033 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1346564569] [2021-12-18 20:51:01,033 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1346564569] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 20:51:01,034 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2104390552] [2021-12-18 20:51:01,034 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-18 20:51:01,034 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-18 20:51:01,034 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-18 20:51:01,035 INFO L229 MonitoredProcess]: Starting monitored process 28 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-18 20:51:01,039 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2021-12-18 20:51:01,740 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-18 20:51:01,740 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-18 20:51:01,746 INFO L263 TraceCheckSpWp]: Trace formula consists of 1012 conjuncts, 91 conjunts are in the unsatisfiable core [2021-12-18 20:51:01,751 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:51:02,117 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:51:02,118 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-18 20:51:02,130 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-12-18 20:51:02,130 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 17 treesize of output 21 [2021-12-18 20:51:02,329 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:51:02,329 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-18 20:51:02,338 INFO L354 Elim1Store]: treesize reduction 8, result has 52.9 percent of original size [2021-12-18 20:51:02,338 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 2 case distinctions, treesize of input 16 treesize of output 18 [2021-12-18 20:51:02,561 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-12-18 20:51:02,564 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-12-18 20:51:02,611 INFO L354 Elim1Store]: treesize reduction 17, result has 46.9 percent of original size [2021-12-18 20:51:02,611 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 30 [2021-12-18 20:51:03,510 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:51:03,512 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-18 20:51:03,513 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 49 treesize of output 31 [2021-12-18 20:51:03,516 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:51:03,518 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-18 20:51:03,518 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 11 [2021-12-18 20:51:03,530 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-18 20:51:03,531 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 16 treesize of output 22 [2021-12-18 20:51:03,538 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-18 20:51:03,538 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2021-12-18 20:51:03,895 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:51:03,903 INFO L354 Elim1Store]: treesize reduction 19, result has 32.1 percent of original size [2021-12-18 20:51:03,903 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 2 case distinctions, treesize of input 17 treesize of output 26 [2021-12-18 20:51:03,909 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-18 20:51:03,910 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2021-12-18 20:51:03,993 INFO L134 CoverageAnalysis]: Checked inductivity of 209 backedges. 45 proven. 160 refuted. 1 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-18 20:51:03,993 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 20:51:04,119 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2104390552] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 20:51:04,119 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-18 20:51:04,119 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 27] total 43 [2021-12-18 20:51:04,119 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [188684436] [2021-12-18 20:51:04,119 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-18 20:51:04,120 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2021-12-18 20:51:04,120 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-18 20:51:04,120 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-12-18 20:51:04,121 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=234, Invalid=1829, Unknown=7, NotChecked=0, Total=2070 [2021-12-18 20:51:04,121 INFO L87 Difference]: Start difference. First operand 172 states and 199 transitions. Second operand has 44 states, 43 states have (on average 4.511627906976744) internal successors, (194), 40 states have internal predecessors, (194), 9 states have call successors, (9), 5 states have call predecessors, (9), 10 states have return successors, (10), 9 states have call predecessors, (10), 9 states have call successors, (10) [2021-12-18 20:51:05,341 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:51:05,341 INFO L93 Difference]: Finished difference Result 198 states and 233 transitions. [2021-12-18 20:51:05,341 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-12-18 20:51:05,342 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 43 states have (on average 4.511627906976744) internal successors, (194), 40 states have internal predecessors, (194), 9 states have call successors, (9), 5 states have call predecessors, (9), 10 states have return successors, (10), 9 states have call predecessors, (10), 9 states have call successors, (10) Word has length 122 [2021-12-18 20:51:05,342 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:51:05,342 INFO L225 Difference]: With dead ends: 198 [2021-12-18 20:51:05,342 INFO L226 Difference]: Without dead ends: 198 [2021-12-18 20:51:05,343 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 189 GetRequests, 117 SyntacticMatches, 6 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1559 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=579, Invalid=3924, Unknown=53, NotChecked=0, Total=4556 [2021-12-18 20:51:05,343 INFO L933 BasicCegarLoop]: 84 mSDtfsCounter, 113 mSDsluCounter, 1107 mSDsCounter, 0 mSdLazyCounter, 298 mSolverCounterSat, 36 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 113 SdHoareTripleChecker+Valid, 1191 SdHoareTripleChecker+Invalid, 532 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 36 IncrementalHoareTripleChecker+Valid, 298 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 198 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-18 20:51:05,344 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [113 Valid, 1191 Invalid, 532 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [36 Valid, 298 Invalid, 0 Unknown, 198 Unchecked, 0.2s Time] [2021-12-18 20:51:05,344 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 198 states. [2021-12-18 20:51:05,346 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 198 to 192. [2021-12-18 20:51:05,347 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 192 states, 155 states have (on average 1.303225806451613) internal successors, (202), 175 states have internal predecessors, (202), 12 states have call successors, (12), 4 states have call predecessors, (12), 4 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2021-12-18 20:51:05,347 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 192 states to 192 states and 226 transitions. [2021-12-18 20:51:05,347 INFO L78 Accepts]: Start accepts. Automaton has 192 states and 226 transitions. Word has length 122 [2021-12-18 20:51:05,348 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:51:05,348 INFO L470 AbstractCegarLoop]: Abstraction has 192 states and 226 transitions. [2021-12-18 20:51:05,348 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 43 states have (on average 4.511627906976744) internal successors, (194), 40 states have internal predecessors, (194), 9 states have call successors, (9), 5 states have call predecessors, (9), 10 states have return successors, (10), 9 states have call predecessors, (10), 9 states have call successors, (10) [2021-12-18 20:51:05,348 INFO L276 IsEmpty]: Start isEmpty. Operand 192 states and 226 transitions. [2021-12-18 20:51:05,349 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2021-12-18 20:51:05,349 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:51:05,349 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 20:51:05,383 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2021-12-18 20:51:05,564 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2021-12-18 20:51:05,564 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr10REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 55 more)] === [2021-12-18 20:51:05,565 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:51:05,565 INFO L85 PathProgramCache]: Analyzing trace with hash 1034754771, now seen corresponding path program 1 times [2021-12-18 20:51:05,565 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-18 20:51:05,565 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [334474923] [2021-12-18 20:51:05,565 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:51:05,565 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-18 20:51:05,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:51:06,017 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2021-12-18 20:51:06,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:51:06,223 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 28 [2021-12-18 20:51:06,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:51:06,582 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 45 [2021-12-18 20:51:06,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:51:07,689 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 64 [2021-12-18 20:51:07,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:51:08,730 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 83 [2021-12-18 20:51:08,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:51:09,927 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 102 [2021-12-18 20:51:09,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:51:11,321 INFO L134 CoverageAnalysis]: Checked inductivity of 209 backedges. 16 proven. 58 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2021-12-18 20:51:11,322 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-18 20:51:11,322 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [334474923] [2021-12-18 20:51:11,322 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [334474923] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 20:51:11,322 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [48781267] [2021-12-18 20:51:11,322 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:51:11,322 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-18 20:51:11,322 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-18 20:51:11,323 INFO L229 MonitoredProcess]: Starting monitored process 29 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-18 20:51:11,324 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2021-12-18 20:51:11,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:51:11,873 INFO L263 TraceCheckSpWp]: Trace formula consists of 1024 conjuncts, 171 conjunts are in the unsatisfiable core [2021-12-18 20:51:11,878 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:51:11,882 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:51:11,930 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-12-18 20:51:11,930 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 17 treesize of output 21 [2021-12-18 20:51:12,192 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-12-18 20:51:12,243 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:51:12,244 INFO L388 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 [2021-12-18 20:51:12,296 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-18 20:51:12,296 INFO L388 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 14 treesize of output 20 [2021-12-18 20:51:12,299 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2021-12-18 20:51:12,364 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-18 20:51:12,365 INFO L388 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 18 treesize of output 24 [2021-12-18 20:51:12,444 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-18 20:51:12,458 INFO L354 Elim1Store]: treesize reduction 43, result has 33.8 percent of original size [2021-12-18 20:51:12,458 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 30 treesize of output 40 [2021-12-18 20:51:12,841 INFO L388 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 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 17 [2021-12-18 20:51:13,109 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:51:13,110 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:51:13,111 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 39 [2021-12-18 20:51:13,117 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-18 20:51:13,140 INFO L354 Elim1Store]: treesize reduction 91, result has 35.0 percent of original size [2021-12-18 20:51:13,140 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 43 treesize of output 72 [2021-12-18 20:51:14,014 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:51:14,016 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:51:14,017 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:51:14,054 INFO L354 Elim1Store]: treesize reduction 94, result has 24.8 percent of original size [2021-12-18 20:51:14,054 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 141 treesize of output 136 [2021-12-18 20:51:14,060 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-18 20:51:14,061 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 103 treesize of output 66 [2021-12-18 20:51:14,105 INFO L354 Elim1Store]: treesize reduction 137, result has 31.8 percent of original size [2021-12-18 20:51:14,105 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 6 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 8 case distinctions, treesize of input 48 treesize of output 90 [2021-12-18 20:51:14,125 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 9 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 52 treesize of output 36 [2021-12-18 20:51:15,060 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:51:15,063 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:51:15,063 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:51:15,117 INFO L354 Elim1Store]: treesize reduction 86, result has 31.2 percent of original size [2021-12-18 20:51:15,118 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 159 treesize of output 158 [2021-12-18 20:51:15,127 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-18 20:51:15,129 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 137 treesize of output 88 [2021-12-18 20:51:15,149 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-18 20:51:15,194 INFO L354 Elim1Store]: treesize reduction 121, result has 34.6 percent of original size [2021-12-18 20:51:15,195 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 10 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 8 case distinctions, treesize of input 48 treesize of output 90 [2021-12-18 20:51:15,233 INFO L354 Elim1Store]: treesize reduction 13, result has 7.1 percent of original size [2021-12-18 20:51:15,234 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 12 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 1 case distinctions, treesize of input 52 treesize of output 36 [2021-12-18 20:51:16,580 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:51:16,582 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:51:16,583 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:51:16,605 INFO L354 Elim1Store]: treesize reduction 42, result has 27.6 percent of original size [2021-12-18 20:51:16,606 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 7 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 126 treesize of output 111 [2021-12-18 20:51:16,615 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-18 20:51:16,615 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 55 treesize of output 31 [2021-12-18 20:51:16,622 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-18 20:51:16,676 INFO L354 Elim1Store]: treesize reduction 123, result has 32.0 percent of original size [2021-12-18 20:51:16,677 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 7 select indices, 7 select index equivalence classes, 14 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 13 case distinctions, treesize of input 46 treesize of output 84 [2021-12-18 20:51:19,784 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:51:19,785 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:51:19,836 INFO L354 Elim1Store]: treesize reduction 80, result has 47.7 percent of original size [2021-12-18 20:51:19,837 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 2 select indices, 2 select index equivalence classes, 11 disjoint index pairs (out of 1 index pairs), introduced 4 new quantified variables, introduced 9 case distinctions, treesize of input 104 treesize of output 142 [2021-12-18 20:51:19,938 INFO L354 Elim1Store]: treesize reduction 154, result has 30.6 percent of original size [2021-12-18 20:51:19,938 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 8 select indices, 8 select index equivalence classes, 20 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 15 case distinctions, treesize of input 51 treesize of output 92 [2021-12-18 20:51:20,034 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:51:20,034 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 8 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 1 [2021-12-18 20:51:20,742 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 7 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 9 [2021-12-18 20:51:21,796 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 18 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 14 [2021-12-18 20:51:21,868 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:51:21,878 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-18 20:51:21,878 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 20 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 1 case distinctions, treesize of input 32 treesize of output 30 [2021-12-18 20:51:22,160 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 13 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 19 [2021-12-18 20:51:22,886 INFO L354 Elim1Store]: treesize reduction 23, result has 17.9 percent of original size [2021-12-18 20:51:22,886 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 6 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 60 treesize of output 48 [2021-12-18 20:51:43,700 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 6 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 116 treesize of output 76 [2021-12-18 20:52:16,238 INFO L134 CoverageAnalysis]: Checked inductivity of 209 backedges. 25 proven. 168 refuted. 4 times theorem prover too weak. 12 trivial. 0 not checked. [2021-12-18 20:52:16,238 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 20:52:16,321 WARN L838 $PredicateComparison]: unable to prove that (forall ((|v_append_#t~mem8.base_102| Int) (v_ArrVal_9663 (Array Int Int)) (v_ArrVal_9664 (Array Int Int)) (|v_append_#t~mem8.offset_101| Int) (v_append_~node~0.base_180 Int)) (or (not (= 0 (select |c_#valid| v_append_~node~0.base_180))) (= (select (store |c_#valid| v_append_~node~0.base_180 1) (select (select (store (let ((.cse0 (store |c_#memory_$Pointer$.base| v_append_~node~0.base_180 v_ArrVal_9664))) (store .cse0 |v_append_#t~mem8.base_102| (store (select .cse0 |v_append_#t~mem8.base_102|) (+ |v_append_#t~mem8.offset_101| 5) v_append_~node~0.base_180))) |c_ULTIMATE.start_main_~list2~0#1.base| v_ArrVal_9663) |c_ULTIMATE.start_main_~list~0#1.base|) |c_ULTIMATE.start_main_~list~0#1.offset|)) 1))) is different from false [2021-12-18 20:52:16,322 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [48781267] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 20:52:16,322 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-18 20:52:16,322 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 47] total 67 [2021-12-18 20:52:16,323 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [972687591] [2021-12-18 20:52:16,323 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-18 20:52:16,323 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 68 states [2021-12-18 20:52:16,323 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-18 20:52:16,323 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2021-12-18 20:52:16,324 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=401, Invalid=3953, Unknown=206, NotChecked=132, Total=4692 [2021-12-18 20:52:16,324 INFO L87 Difference]: Start difference. First operand 192 states and 226 transitions. Second operand has 68 states, 67 states have (on average 2.373134328358209) internal successors, (159), 65 states have internal predecessors, (159), 8 states have call successors, (8), 3 states have call predecessors, (8), 9 states have return successors, (10), 8 states have call predecessors, (10), 8 states have call successors, (10) [2021-12-18 20:52:23,406 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:52:23,406 INFO L93 Difference]: Finished difference Result 198 states and 228 transitions. [2021-12-18 20:52:23,406 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-12-18 20:52:23,407 INFO L78 Accepts]: Start accepts. Automaton has has 68 states, 67 states have (on average 2.373134328358209) internal successors, (159), 65 states have internal predecessors, (159), 8 states have call successors, (8), 3 states have call predecessors, (8), 9 states have return successors, (10), 8 states have call predecessors, (10), 8 states have call successors, (10) Word has length 124 [2021-12-18 20:52:23,407 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:52:23,408 INFO L225 Difference]: With dead ends: 198 [2021-12-18 20:52:23,408 INFO L226 Difference]: Without dead ends: 198 [2021-12-18 20:52:23,408 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 212 GetRequests, 111 SyntacticMatches, 21 SemanticMatches, 80 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 2914 ImplicationChecksByTransitivity, 31.5s TimeCoverageRelationStatistics Valid=592, Invalid=5591, Unknown=301, NotChecked=158, Total=6642 [2021-12-18 20:52:23,409 INFO L933 BasicCegarLoop]: 75 mSDtfsCounter, 94 mSDsluCounter, 1047 mSDsCounter, 0 mSdLazyCounter, 407 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 94 SdHoareTripleChecker+Valid, 1122 SdHoareTripleChecker+Invalid, 908 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 407 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 476 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-18 20:52:23,409 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [94 Valid, 1122 Invalid, 908 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 407 Invalid, 0 Unknown, 476 Unchecked, 0.3s Time] [2021-12-18 20:52:23,409 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 198 states. [2021-12-18 20:52:23,411 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 198 to 192. [2021-12-18 20:52:23,412 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 192 states, 157 states have (on average 1.2611464968152866) internal successors, (198), 175 states have internal predecessors, (198), 12 states have call successors, (12), 4 states have call predecessors, (12), 4 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2021-12-18 20:52:23,413 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 192 states to 192 states and 222 transitions. [2021-12-18 20:52:23,413 INFO L78 Accepts]: Start accepts. Automaton has 192 states and 222 transitions. Word has length 124 [2021-12-18 20:52:23,413 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:52:23,414 INFO L470 AbstractCegarLoop]: Abstraction has 192 states and 222 transitions. [2021-12-18 20:52:23,414 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 68 states, 67 states have (on average 2.373134328358209) internal successors, (159), 65 states have internal predecessors, (159), 8 states have call successors, (8), 3 states have call predecessors, (8), 9 states have return successors, (10), 8 states have call predecessors, (10), 8 states have call successors, (10) [2021-12-18 20:52:23,414 INFO L276 IsEmpty]: Start isEmpty. Operand 192 states and 222 transitions. [2021-12-18 20:52:23,415 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2021-12-18 20:52:23,415 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:52:23,415 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 20:52:23,446 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2021-12-18 20:52:23,631 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2021-12-18 20:52:23,631 INFO L402 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 55 more)] === [2021-12-18 20:52:23,632 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:52:23,632 INFO L85 PathProgramCache]: Analyzing trace with hash 1034754772, now seen corresponding path program 1 times [2021-12-18 20:52:23,632 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-18 20:52:23,632 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [86485440] [2021-12-18 20:52:23,632 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:52:23,632 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-18 20:52:24,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:52:25,257 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2021-12-18 20:52:25,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:52:25,533 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 28 [2021-12-18 20:52:25,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:52:27,627 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 45 [2021-12-18 20:52:27,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:52:49,630 WARN L227 SmtUtils]: Spent 6.99s on a formula simplification that was a NOOP. DAG size: 300 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-12-18 20:53:07,598 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 64 [2021-12-18 20:53:07,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:53:18,000 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 83 [2021-12-18 20:53:18,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:53:30,610 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 102 [2021-12-18 20:53:30,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:53:37,203 INFO L134 CoverageAnalysis]: Checked inductivity of 209 backedges. 18 proven. 154 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2021-12-18 20:53:37,203 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-18 20:53:37,203 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [86485440] [2021-12-18 20:53:37,203 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [86485440] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 20:53:37,203 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [871030961] [2021-12-18 20:53:37,203 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:53:37,203 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-18 20:53:37,204 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-18 20:53:37,204 INFO L229 MonitoredProcess]: Starting monitored process 30 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-18 20:53:37,205 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2021-12-18 20:53:37,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:53:37,817 INFO L263 TraceCheckSpWp]: Trace formula consists of 1024 conjuncts, 249 conjunts are in the unsatisfiable core [2021-12-18 20:53:37,826 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:53:37,835 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:53:37,960 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-12-18 20:53:37,960 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 17 treesize of output 21 [2021-12-18 20:53:38,294 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:53:38,708 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-12-18 20:53:38,719 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-12-18 20:53:38,866 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:53:38,867 INFO L388 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 [2021-12-18 20:53:38,872 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:53:38,872 INFO L388 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 [2021-12-18 20:53:39,023 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-18 20:53:39,023 INFO L388 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 14 treesize of output 20 [2021-12-18 20:53:39,030 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2021-12-18 20:53:39,045 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-18 20:53:39,045 INFO L388 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 14 treesize of output 20 [2021-12-18 20:53:39,052 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2021-12-18 20:53:39,220 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-18 20:53:39,221 INFO L388 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 18 treesize of output 24 [2021-12-18 20:53:39,232 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-18 20:53:39,232 INFO L388 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 18 treesize of output 24 [2021-12-18 20:53:39,635 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-18 20:53:39,656 INFO L354 Elim1Store]: treesize reduction 43, result has 33.8 percent of original size [2021-12-18 20:53:39,656 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 30 treesize of output 40 [2021-12-18 20:53:40,501 INFO L388 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 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 17 [2021-12-18 20:53:41,055 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:53:41,056 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:53:41,056 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 25 [2021-12-18 20:53:41,063 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:53:41,063 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:53:41,064 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 55 treesize of output 46 [2021-12-18 20:53:41,069 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:53:41,070 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 24 [2021-12-18 20:53:41,078 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-18 20:53:41,104 INFO L354 Elim1Store]: treesize reduction 91, result has 35.0 percent of original size [2021-12-18 20:53:41,104 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 43 treesize of output 72 [2021-12-18 20:53:42,786 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:53:42,789 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:53:42,789 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:53:42,840 INFO L354 Elim1Store]: treesize reduction 94, result has 24.8 percent of original size [2021-12-18 20:53:42,841 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 179 treesize of output 168 [2021-12-18 20:53:42,850 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:53:42,851 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:53:42,852 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:53:42,852 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:53:42,853 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:53:42,854 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 9 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 30 [2021-12-18 20:53:42,861 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-18 20:53:42,862 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 112 treesize of output 71 [2021-12-18 20:53:42,874 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-18 20:53:42,874 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-18 20:53:42,907 INFO L354 Elim1Store]: treesize reduction 110, result has 34.9 percent of original size [2021-12-18 20:53:42,907 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 6 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 8 case distinctions, treesize of input 48 treesize of output 85 [2021-12-18 20:53:42,914 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 7 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 24 [2021-12-18 20:53:42,926 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 9 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 52 treesize of output 36 [2021-12-18 20:53:44,776 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:53:44,779 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:53:44,779 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:53:44,828 INFO L354 Elim1Store]: treesize reduction 94, result has 24.8 percent of original size [2021-12-18 20:53:44,828 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 186 treesize of output 173 [2021-12-18 20:53:44,839 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:53:44,840 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:53:44,841 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:53:44,842 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:53:44,843 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:53:44,844 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 11 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 30 [2021-12-18 20:53:44,852 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-18 20:53:44,853 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 111 treesize of output 70 [2021-12-18 20:53:44,861 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:53:44,862 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 5 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 24 [2021-12-18 20:53:44,877 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-18 20:53:44,928 INFO L354 Elim1Store]: treesize reduction 151, result has 34.3 percent of original size [2021-12-18 20:53:44,929 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 10 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 10 case distinctions, treesize of input 53 treesize of output 108 [2021-12-18 20:53:45,070 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 10 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 116 treesize of output 88 [2021-12-18 20:53:47,637 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:53:47,640 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:53:47,641 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:53:47,692 INFO L354 Elim1Store]: treesize reduction 94, result has 24.8 percent of original size [2021-12-18 20:53:47,692 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 2 select indices, 2 select index equivalence classes, 7 disjoint index pairs (out of 1 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 215 treesize of output 196 [2021-12-18 20:53:47,707 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:53:47,708 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:53:47,709 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:53:47,710 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:53:47,711 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:53:47,712 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 13 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 30 [2021-12-18 20:53:47,723 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-18 20:53:47,724 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 128 treesize of output 79 [2021-12-18 20:53:47,735 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:53:47,736 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 6 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 24 [2021-12-18 20:53:47,806 INFO L354 Elim1Store]: treesize reduction 202, result has 30.6 percent of original size [2021-12-18 20:53:47,806 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 7 select indices, 7 select index equivalence classes, 15 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 12 case distinctions, treesize of input 58 treesize of output 121 [2021-12-18 20:53:47,963 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 14 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 124 treesize of output 92 [2021-12-18 20:53:50,380 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:53:50,383 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:53:50,384 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:53:50,408 INFO L354 Elim1Store]: treesize reduction 38, result has 34.5 percent of original size [2021-12-18 20:53:50,409 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 9 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 159 treesize of output 142 [2021-12-18 20:53:50,424 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:53:50,425 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:53:50,426 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:53:50,427 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:53:50,437 INFO L354 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2021-12-18 20:53:50,437 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 14 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 24 treesize of output 38 [2021-12-18 20:53:50,450 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-18 20:53:50,450 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 79 treesize of output 47 [2021-12-18 20:53:50,488 INFO L354 Elim1Store]: treesize reduction 24, result has 54.7 percent of original size [2021-12-18 20:53:50,488 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 7 select indices, 7 select index equivalence classes, 21 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 6 case distinctions, treesize of input 40 treesize of output 50 [2021-12-18 20:53:50,498 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 18 [2021-12-18 20:53:50,701 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 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 33 treesize of output 17 [2021-12-18 20:53:50,704 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-12-18 20:53:50,969 INFO L134 CoverageAnalysis]: Checked inductivity of 209 backedges. 38 proven. 151 refuted. 8 times theorem prover too weak. 12 trivial. 0 not checked. [2021-12-18 20:53:50,969 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 20:53:51,546 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_10396 Int) (v_append_~node~0.base_183 Int)) (or (and (forall ((v_ArrVal_10402 (Array Int Int)) (v_ArrVal_10401 (Array Int Int)) (v_ArrVal_10400 (Array Int Int)) (v_ArrVal_10399 (Array Int Int)) (v_ArrVal_10398 (Array Int Int)) (v_ArrVal_10397 (Array Int Int))) (let ((.cse1 (store |c_#memory_$Pointer$.base| v_append_~node~0.base_183 v_ArrVal_10400))) (let ((.cse0 (select (select .cse1 |c_ULTIMATE.start_main_~list2~0#1.base|) (+ |c_ULTIMATE.start_main_~list2~0#1.offset| 4)))) (<= (+ (select (select (store (store (store |c_#memory_$Pointer$.offset| v_append_~node~0.base_183 v_ArrVal_10401) .cse0 v_ArrVal_10399) |c_ULTIMATE.start_main_~list2~0#1.base| v_ArrVal_10402) |c_ULTIMATE.start_main_~list~0#1.base|) |c_ULTIMATE.start_main_~list~0#1.offset|) 9) (select (store |c_#length| v_append_~node~0.base_183 v_ArrVal_10396) (select (select (store (store .cse1 .cse0 v_ArrVal_10397) |c_ULTIMATE.start_main_~list2~0#1.base| v_ArrVal_10398) |c_ULTIMATE.start_main_~list~0#1.base|) |c_ULTIMATE.start_main_~list~0#1.offset|)))))) (forall ((v_ArrVal_10402 (Array Int Int)) (v_ArrVal_10401 (Array Int Int)) (v_ArrVal_10400 (Array Int Int)) (v_ArrVal_10399 (Array Int Int))) (<= 0 (+ (select (select (store (store (store |c_#memory_$Pointer$.offset| v_append_~node~0.base_183 v_ArrVal_10401) (select (select (store |c_#memory_$Pointer$.base| v_append_~node~0.base_183 v_ArrVal_10400) |c_ULTIMATE.start_main_~list2~0#1.base|) (+ |c_ULTIMATE.start_main_~list2~0#1.offset| 4)) v_ArrVal_10399) |c_ULTIMATE.start_main_~list2~0#1.base| v_ArrVal_10402) |c_ULTIMATE.start_main_~list~0#1.base|) |c_ULTIMATE.start_main_~list~0#1.offset|) 5)))) (< v_ArrVal_10396 9) (not (= 0 (select |c_#valid| v_append_~node~0.base_183))))) is different from false [2021-12-18 20:53:51,547 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [871030961] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 20:53:51,547 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-18 20:53:51,547 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 48] total 85 [2021-12-18 20:53:51,547 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [668179774] [2021-12-18 20:53:51,547 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-18 20:53:51,548 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 86 states [2021-12-18 20:53:51,548 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-18 20:53:51,548 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 86 interpolants. [2021-12-18 20:53:51,549 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=539, Invalid=7100, Unknown=197, NotChecked=174, Total=8010 [2021-12-18 20:53:51,549 INFO L87 Difference]: Start difference. First operand 192 states and 222 transitions. Second operand has 86 states, 85 states have (on average 2.411764705882353) internal successors, (205), 83 states have internal predecessors, (205), 9 states have call successors, (9), 3 states have call predecessors, (9), 12 states have return successors, (12), 9 states have call predecessors, (12), 9 states have call successors, (12) [2021-12-18 20:53:56,487 WARN L860 $PredicateComparison]: unable to prove that (let ((.cse53 (@diff |c_old(#memory_$Pointer$.base)| |c_#memory_$Pointer$.base|)) (.cse100 (@diff |c_old(#memory_$Pointer$.offset)| |c_#memory_$Pointer$.offset|))) (let ((.cse98 (select |c_#memory_$Pointer$.offset| .cse100)) (.cse25 (select |c_#memory_$Pointer$.base| .cse53))) (let ((.cse80 (store |c_old(#memory_$Pointer$.base)| .cse53 .cse25)) (.cse119 (store |c_old(#memory_$Pointer$.offset)| .cse100 .cse98))) (let ((.cse104 (@diff .cse119 |c_#memory_$Pointer$.offset|)) (.cse81 (@diff .cse80 |c_#memory_$Pointer$.base|))) (let ((.cse31 (select |c_#memory_$Pointer$.base| .cse81)) (.cse102 (select |c_#memory_$Pointer$.offset| .cse104))) (let ((.cse82 (store .cse119 .cse104 .cse102)) (.cse114 (store .cse80 .cse81 .cse31))) (let ((.cse35 (@diff .cse114 |c_#memory_$Pointer$.base|)) (.cse111 (@diff .cse82 |c_#memory_$Pointer$.offset|))) (let ((.cse49 (select |c_#memory_$Pointer$.offset| .cse111)) (.cse28 (select |c_#memory_$Pointer$.base| .cse35))) (let ((.cse110 (store .cse114 .cse35 .cse28)) (.cse118 (store .cse82 .cse111 .cse49))) (let ((.cse105 (@diff .cse118 |c_#memory_$Pointer$.offset|)) (.cse41 (@diff .cse110 |c_#memory_$Pointer$.base|))) (let ((.cse19 (select |c_#memory_$Pointer$.base| .cse41)) (.cse108 (select |c_#memory_$Pointer$.offset| .cse105))) (let ((.cse13 (store .cse118 .cse105 .cse108)) (.cse96 (store .cse110 .cse41 .cse19))) (let ((.cse67 (@diff .cse96 |c_#memory_$Pointer$.base|)) (.cse86 (@diff .cse13 |c_#memory_$Pointer$.offset|))) (let ((.cse97 (select |c_old(#memory_$Pointer$.offset)| .cse100)) (.cse101 (select |c_old(#memory_$Pointer$.offset)| .cse104)) (.cse106 (select |c_old(#memory_$Pointer$.offset)| .cse105)) (.cse48 (select |c_old(#memory_$Pointer$.offset)| .cse111)) (.cse116 (select |c_old(#memory_$Pointer$.base)| .cse41)) (.cse115 (select |c_old(#memory_$Pointer$.base)| .cse53)) (.cse113 (select |c_old(#memory_$Pointer$.base)| .cse81)) (.cse109 (select |c_old(#memory_$Pointer$.base)| .cse35)) (.cse51 (select |c_old(#memory_$Pointer$.offset)| .cse86)) (.cse52 (select |c_#memory_$Pointer$.offset| .cse86)) (.cse68 (select |c_old(#memory_$Pointer$.base)| .cse67)) (.cse61 (select |c_#memory_$Pointer$.base| .cse67))) (let ((.cse20 (@diff .cse68 .cse61)) (.cse117 (@diff .cse51 .cse52)) (.cse83 (@diff .cse109 .cse28)) (.cse60 (@diff .cse113 .cse31)) (.cse79 (@diff .cse115 .cse25)) (.cse70 (@diff .cse116 .cse19)) (.cse112 (@diff .cse48 .cse49)) (.cse107 (@diff .cse106 .cse108)) (.cse103 (@diff .cse101 .cse102)) (.cse99 (@diff .cse97 .cse98))) (let ((.cse87 (select .cse98 .cse99)) (.cse1 (select .cse102 .cse103)) (.cse10 (select .cse108 .cse107)) (.cse50 (select .cse49 .cse112)) (.cse5 (@diff |c_old(#length)| |c_#length|)) (.cse42 (select .cse19 .cse70)) (.cse54 (select .cse25 .cse79)) (.cse65 (select .cse31 .cse60)) (.cse36 (select .cse28 .cse83)) (.cse15 (select .cse52 .cse117)) (.cse39 (select .cse61 .cse20))) (let ((.cse23 (= (store .cse68 .cse20 .cse39) .cse61)) (.cse33 (select |c_#length| .cse39)) (.cse12 (= (select |c_old(#valid)| .cse86) 0)) (.cse14 (= .cse86 |c_append_#in~head.base|)) (.cse16 (= (store .cse51 .cse117 .cse15) .cse52)) (.cse38 (= (store .cse109 .cse83 .cse36) .cse28)) (.cse57 (= (store .cse113 .cse60 .cse65) .cse31)) (.cse58 (select |c_#length| .cse65)) (.cse56 (= (store .cse115 .cse79 .cse54) .cse25)) (.cse69 (select |c_#length| .cse42)) (.cse43 (= (store .cse116 .cse70 .cse42) .cse19)) (.cse55 (= .cse115 .cse25)) (.cse59 (= .cse114 |c_#memory_$Pointer$.base|)) (.cse66 (select |c_#length| .cse54)) (.cse63 (@diff |c_old(#valid)| |c_#valid|)) (.cse62 (= .cse113 .cse31)) (.cse6 (select |c_#length| .cse5)) (.cse45 (= .cse111 |c_append_#in~head.base|)) (.cse47 (= (store .cse48 .cse112 .cse50) .cse49)) (.cse46 (= (select |c_old(#valid)| .cse111) 0)) (.cse27 (= (select |c_old(#valid)| .cse35) 0)) (.cse29 (= .cse35 |c_append_#in~head.base|)) (.cse64 (select |c_#length| .cse36)) (.cse24 (= (select |c_old(#valid)| .cse53) 0)) (.cse26 (= .cse53 |c_append_#in~head.base|)) (.cse21 (= .cse41 |c_append_#in~head.base|)) (.cse44 (= .cse110 |c_#memory_$Pointer$.base|)) (.cse22 (= (select |c_old(#valid)| .cse41) 0)) (.cse30 (= .cse81 |c_append_#in~head.base|)) (.cse32 (= (select |c_old(#valid)| .cse81) 0)) (.cse17 (= .cse67 |c_append_#in~head.base|)) (.cse18 (= (select |c_old(#valid)| .cse67) 0)) (.cse34 (= .cse96 |c_#memory_$Pointer$.base|)) (.cse37 (= .cse109 .cse28)) (.cse7 (= (select |c_old(#valid)| .cse105) 0)) (.cse11 (= .cse106 .cse108)) (.cse9 (= (store .cse106 .cse107 .cse10) .cse108)) (.cse8 (= .cse105 |c_append_#in~head.base|)) (.cse0 (= (select |c_old(#valid)| .cse104) 0)) (.cse4 (= .cse104 |c_append_#in~head.base|)) (.cse3 (= (store .cse101 .cse103 .cse1) .cse102)) (.cse2 (= .cse101 .cse102)) (.cse90 (= (select |c_old(#valid)| .cse100) 0)) (.cse91 (= .cse100 |c_append_#in~head.base|)) (.cse89 (= (store .cse97 .cse99 .cse87) .cse98)) (.cse88 (= .cse97 .cse98)) (.cse40 (= |c_old(#length)| |c_#length|))) (and (or .cse0 (and (or (= 0 .cse1) .cse2) .cse3) .cse4) (= (store |c_old(#length)| .cse5 .cse6) |c_#length|) (or .cse7 .cse8 (and .cse9 (or (= .cse10 0) .cse11))) (or .cse12 (= .cse13 |c_#memory_$Pointer$.offset|) .cse14 (and (= .cse15 0) .cse16)) (or .cse17 .cse18 (and (or (= 9 (select |c_#length| (select .cse19 .cse20))) .cse21 .cse22) .cse23 (or .cse24 (= 9 (select |c_#length| (select .cse25 .cse20))) .cse26) (or .cse27 (= 9 (select |c_#length| (select .cse28 .cse20))) .cse29) (or .cse30 (= 9 (select |c_#length| (select .cse31 .cse20))) .cse32) (= 9 .cse33)) .cse34) (or .cse27 .cse29 (and (or (= (select |c_#valid| .cse35) (select |c_#valid| .cse36)) .cse37) .cse38)) (or (and .cse23 (= .cse33 9) (or (= .cse5 .cse39) .cse40)) .cse17 .cse18 .cse34) (or (and (= (select |c_#valid| .cse41) (select |c_#valid| .cse42)) .cse43) .cse21 .cse44 .cse22) (or .cse45 .cse46 (and .cse47 (or (= .cse48 .cse49) (= 0 .cse50)))) (or .cse12 .cse14 (and (or (= 0 .cse15) (= .cse51 .cse52)) .cse16)) (or .cse24 (and (or (= (select |c_#valid| .cse53) (select |c_#valid| .cse54)) .cse55) .cse56) .cse26) (or .cse30 .cse32 (and .cse57 (or (and (= 9 .cse58) (or .cse59 .cse27 .cse29 (= 9 (select |c_#length| (select .cse28 .cse60)))) (or (= 9 (select |c_#length| (select .cse25 .cse60))) .cse24 .cse26) (or .cse17 (= 9 (select |c_#length| (select .cse61 .cse60))) .cse18 .cse34) (or (= 9 (select |c_#length| (select .cse19 .cse60))) .cse21 .cse44 .cse22)) .cse62))) (= (store |c_old(#valid)| .cse63 (select |c_#valid| .cse63)) |c_#valid|) (or .cse27 (and (or (= .cse64 9) .cse37) (or .cse40 (= .cse5 .cse36) .cse37) .cse38) .cse29) (or .cse30 (and .cse57 (or (= .cse58 9) .cse62) (or (= .cse5 .cse65) .cse40 .cse62)) .cse32) (or .cse24 (and (or .cse40 .cse55 (= .cse5 .cse54)) (or .cse55 (= .cse66 9)) .cse56) .cse26) (or (= (select |c_#valid| .cse67) (select |c_#valid| .cse39)) .cse17 .cse18 (= .cse68 .cse61)) (or (and (= 9 .cse69) (or .cse24 .cse26 (= 9 (select |c_#length| (select .cse25 .cse70)))) (or (= 9 (select |c_#length| (select .cse61 .cse70))) .cse17 .cse18 .cse34) (or .cse27 .cse29 (= 9 (select |c_#length| (select .cse28 .cse70)))) (or .cse30 (= 9 (select |c_#length| (select .cse31 .cse70))) .cse32)) .cse21 .cse44 .cse22) (exists ((v_ArrVal_10329 (Array Int Int)) (v_ArrVal_10328 (Array Int Int)) (v_ArrVal_10338 (Array Int Int)) (v_ArrVal_10335 (Array Int Int)) (v_ArrVal_10334 (Array Int Int)) (v_ArrVal_10327 Int) (append_~node~0.base Int)) (let ((.cse73 (store |c_old(#memory_$Pointer$.base)| append_~node~0.base v_ArrVal_10328)) (.cse72 (+ |c_append_#in~head.offset| 4))) (let ((.cse74 (select (select .cse73 |c_append_#in~head.base|) .cse72))) (and (= 0 (select |c_old(#valid)| append_~node~0.base)) (= |c_#memory_$Pointer$.base| (let ((.cse71 (store .cse73 .cse74 v_ArrVal_10334))) (store .cse71 |c_append_#in~head.base| (store (select .cse71 |c_append_#in~head.base|) .cse72 append_~node~0.base)))) (= |c_#valid| (store |c_old(#valid)| append_~node~0.base 1)) (= 1 (select |c_#valid| .cse74)) (= |c_#length| (store |c_old(#length)| append_~node~0.base v_ArrVal_10327)) (= |c_#memory_$Pointer$.offset| (store (store (store |c_old(#memory_$Pointer$.offset)| append_~node~0.base v_ArrVal_10329) .cse74 v_ArrVal_10335) |c_append_#in~head.base| v_ArrVal_10338)))))) (or (and (= .cse69 9) .cse43 (or .cse40 (= .cse5 .cse42))) .cse21 .cse44 .cse22) (= 1 (select |c_#valid| |c_append_#in~head.base|)) (exists ((v_ArrVal_10329 (Array Int Int)) (v_ArrVal_10328 (Array Int Int)) (v_ArrVal_10349 (Array Int Int)) (v_ArrVal_10347 (Array Int Int)) (v_ArrVal_10327 Int) (append_~node~0.base Int) (v_ArrVal_10352 (Array Int Int))) (let ((.cse78 (store |c_old(#memory_$Pointer$.base)| append_~node~0.base v_ArrVal_10328)) (.cse77 (+ |c_append_#in~head.offset| 4))) (let ((.cse75 (select (select .cse78 |c_append_#in~head.base|) .cse77))) (and (= 0 (select |c_old(#valid)| append_~node~0.base)) (= |c_#memory_$Pointer$.offset| (store (store (store |c_old(#memory_$Pointer$.offset)| append_~node~0.base v_ArrVal_10329) .cse75 v_ArrVal_10349) |c_append_#in~head.base| v_ArrVal_10352)) (= |c_#valid| (store |c_old(#valid)| append_~node~0.base 1)) (= |c_#memory_$Pointer$.base| (let ((.cse76 (store .cse78 .cse75 v_ArrVal_10347))) (store .cse76 |c_append_#in~head.base| (store (select .cse76 |c_append_#in~head.base|) .cse77 append_~node~0.base)))) (= |c_#length| (store |c_old(#length)| append_~node~0.base v_ArrVal_10327)))))) (or .cse55 .cse24 (and (or .cse59 .cse27 .cse29 (= 9 (select |c_#length| (select .cse28 .cse79)))) (or (= 9 (select |c_#length| (select .cse61 .cse79))) .cse17 .cse18 .cse34) (= 9 .cse66) (or .cse21 (= 9 (select |c_#length| (select .cse19 .cse79))) .cse44 .cse22) (or .cse30 (= .cse80 |c_#memory_$Pointer$.base|) (= 9 (select |c_#length| (select .cse31 .cse79))) .cse32)) .cse26) (or (= (select |c_old(#valid)| .cse63) 0) (= |c_old(#valid)| |c_#valid|)) (or .cse30 (= (select |c_#valid| .cse81) (select |c_#valid| .cse65)) .cse32 .cse62) (or (= .cse6 9) .cse40) (or .cse45 (and .cse47 (= .cse50 0)) .cse46 (= .cse82 |c_#memory_$Pointer$.offset|)) (<= 0 |c_append_#in~head.offset|) (or .cse27 .cse29 (and (= 9 .cse64) (or (= 9 (select |c_#length| (select .cse25 .cse83))) .cse24 .cse26) (or (= 9 (select |c_#length| (select .cse19 .cse83))) .cse21 .cse44 .cse22) (or .cse30 (= 9 (select |c_#length| (select .cse31 .cse83))) .cse32) (or (= 9 (select |c_#length| (select .cse61 .cse83))) .cse17 .cse18 .cse34)) .cse37) (exists ((v_ArrVal_10367 Int) (v_ArrVal_10377 (Array Int Int)) (v_ArrVal_10376 (Array Int Int)) (append_~node~0.base Int) (v_ArrVal_10375 (Array Int Int)) (v_ArrVal_10374 (Array Int Int)) (v_ArrVal_10373 (Array Int Int)) (v_ArrVal_10372 (Array Int Int))) (let ((.cse85 (store |c_old(#memory_$Pointer$.base)| append_~node~0.base v_ArrVal_10373))) (let ((.cse84 (select (select .cse85 |c_append_#in~head.base|) (+ |c_append_#in~head.offset| 4)))) (and (= 0 (select |c_old(#valid)| append_~node~0.base)) (= |c_#length| (store |c_old(#length)| append_~node~0.base v_ArrVal_10367)) (= |c_#memory_$Pointer$.offset| (store (store (store |c_old(#memory_$Pointer$.offset)| append_~node~0.base v_ArrVal_10372) .cse84 v_ArrVal_10375) |c_append_#in~head.base| v_ArrVal_10377)) (<= 9 v_ArrVal_10367) (= |c_#memory_$Pointer$.base| (store (store .cse85 .cse84 v_ArrVal_10374) |c_append_#in~head.base| v_ArrVal_10376)))))) (or .cse7 (and (or (= 0 .cse10) .cse11) .cse9) .cse8) (or .cse0 .cse4 (and .cse3 (or (= .cse1 0) .cse2))) (= (store .cse13 .cse86 .cse52) |c_#memory_$Pointer$.offset|) (or (and (or (= 0 .cse87) .cse88) .cse89) .cse90 .cse91) (exists ((append_~head.offset Int) (v_ArrVal_10354 Int) (v_ArrVal_10353 Int) (v_ArrVal_10356 (Array Int Int)) (v_ArrVal_10355 (Array Int Int)) (v_ArrVal_10366 (Array Int Int)) (append_~node~0.base Int) (v_ArrVal_10363 (Array Int Int)) (v_ArrVal_10362 (Array Int Int))) (let ((.cse95 (store |c_old(#memory_$Pointer$.base)| append_~node~0.base v_ArrVal_10355)) (.cse94 (+ append_~head.offset 4))) (let ((.cse92 (select (select .cse95 |c_append_#in~head.base|) .cse94))) (and (= 0 (select |c_old(#valid)| append_~node~0.base)) (<= 0 append_~head.offset) (= |c_#memory_$Pointer$.offset| (store (store (store |c_old(#memory_$Pointer$.offset)| append_~node~0.base v_ArrVal_10356) .cse92 v_ArrVal_10363) |c_append_#in~head.base| v_ArrVal_10366)) (= |c_#memory_$Pointer$.base| (let ((.cse93 (store .cse95 .cse92 v_ArrVal_10362))) (store .cse93 |c_append_#in~head.base| (store (select .cse93 |c_append_#in~head.base|) .cse94 append_~node~0.base)))) (= |c_#length| (store |c_old(#length)| append_~node~0.base v_ArrVal_10354)) (= |c_#valid| (store |c_old(#valid)| append_~node~0.base v_ArrVal_10353)) (<= append_~head.offset |c_append_#in~head.offset|) (= 1 (select |c_#valid| .cse92)))))) (or .cse90 .cse91 (and .cse89 (or (= .cse87 0) .cse88))) (or .cse40 (= (select |c_old(#valid)| .cse5) 0)) (= (store .cse96 .cse67 .cse61) |c_#memory_$Pointer$.base|))))))))))))))))))) is different from true [2021-12-18 20:53:58,915 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:53:58,915 INFO L93 Difference]: Finished difference Result 202 states and 233 transitions. [2021-12-18 20:53:58,915 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-12-18 20:53:58,916 INFO L78 Accepts]: Start accepts. Automaton has has 86 states, 85 states have (on average 2.411764705882353) internal successors, (205), 83 states have internal predecessors, (205), 9 states have call successors, (9), 3 states have call predecessors, (9), 12 states have return successors, (12), 9 states have call predecessors, (12), 9 states have call successors, (12) Word has length 124 [2021-12-18 20:53:58,916 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:53:58,917 INFO L225 Difference]: With dead ends: 202 [2021-12-18 20:53:58,917 INFO L226 Difference]: Without dead ends: 202 [2021-12-18 20:53:58,918 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 227 GetRequests, 101 SyntacticMatches, 16 SemanticMatches, 110 ConstructedPredicates, 2 IntricatePredicates, 0 DeprecatedPredicates, 4541 ImplicationChecksByTransitivity, 29.3s TimeCoverageRelationStatistics Valid=966, Invalid=10750, Unknown=282, NotChecked=434, Total=12432 [2021-12-18 20:53:58,918 INFO L933 BasicCegarLoop]: 86 mSDtfsCounter, 187 mSDsluCounter, 2353 mSDsCounter, 0 mSdLazyCounter, 832 mSolverCounterSat, 55 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 187 SdHoareTripleChecker+Valid, 2439 SdHoareTripleChecker+Invalid, 1828 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 55 IncrementalHoareTripleChecker+Valid, 832 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 941 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2021-12-18 20:53:58,918 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [187 Valid, 2439 Invalid, 1828 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [55 Valid, 832 Invalid, 0 Unknown, 941 Unchecked, 1.7s Time] [2021-12-18 20:53:58,919 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2021-12-18 20:53:58,921 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 192. [2021-12-18 20:53:58,921 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 192 states, 157 states have (on average 1.2547770700636942) internal successors, (197), 175 states have internal predecessors, (197), 12 states have call successors, (12), 4 states have call predecessors, (12), 4 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2021-12-18 20:53:58,921 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 192 states to 192 states and 221 transitions. [2021-12-18 20:53:58,922 INFO L78 Accepts]: Start accepts. Automaton has 192 states and 221 transitions. Word has length 124 [2021-12-18 20:53:58,922 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:53:58,922 INFO L470 AbstractCegarLoop]: Abstraction has 192 states and 221 transitions. [2021-12-18 20:53:58,922 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 86 states, 85 states have (on average 2.411764705882353) internal successors, (205), 83 states have internal predecessors, (205), 9 states have call successors, (9), 3 states have call predecessors, (9), 12 states have return successors, (12), 9 states have call predecessors, (12), 9 states have call successors, (12) [2021-12-18 20:53:58,922 INFO L276 IsEmpty]: Start isEmpty. Operand 192 states and 221 transitions. [2021-12-18 20:53:58,923 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2021-12-18 20:53:58,923 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:53:58,923 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 20:53:58,949 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2021-12-18 20:53:59,139 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2021-12-18 20:53:59,139 INFO L402 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr12REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 55 more)] === [2021-12-18 20:53:59,140 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:53:59,140 INFO L85 PathProgramCache]: Analyzing trace with hash 1399123590, now seen corresponding path program 1 times [2021-12-18 20:53:59,140 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-18 20:53:59,140 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [337707498] [2021-12-18 20:53:59,140 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:53:59,140 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-18 20:53:59,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:53:59,204 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2021-12-18 20:53:59,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:53:59,210 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 28 [2021-12-18 20:53:59,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:53:59,216 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 45 [2021-12-18 20:53:59,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:53:59,223 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 64 [2021-12-18 20:53:59,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:53:59,232 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 83 [2021-12-18 20:53:59,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:53:59,238 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 102 [2021-12-18 20:53:59,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:53:59,245 INFO L134 CoverageAnalysis]: Checked inductivity of 209 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 209 trivial. 0 not checked. [2021-12-18 20:53:59,245 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-18 20:53:59,245 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [337707498] [2021-12-18 20:53:59,246 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [337707498] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-18 20:53:59,246 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-18 20:53:59,246 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-12-18 20:53:59,246 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1875470594] [2021-12-18 20:53:59,246 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-18 20:53:59,246 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-12-18 20:53:59,247 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-18 20:53:59,247 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-12-18 20:53:59,247 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-12-18 20:53:59,247 INFO L87 Difference]: Start difference. First operand 192 states and 221 transitions. Second operand has 4 states, 3 states have (on average 14.666666666666666) internal successors, (44), 3 states have internal predecessors, (44), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-12-18 20:53:59,325 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:53:59,325 INFO L93 Difference]: Finished difference Result 196 states and 224 transitions. [2021-12-18 20:53:59,326 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-12-18 20:53:59,326 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 14.666666666666666) internal successors, (44), 3 states have internal predecessors, (44), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 127 [2021-12-18 20:53:59,326 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:53:59,326 INFO L225 Difference]: With dead ends: 196 [2021-12-18 20:53:59,327 INFO L226 Difference]: Without dead ends: 196 [2021-12-18 20:53:59,327 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-12-18 20:53:59,327 INFO L933 BasicCegarLoop]: 78 mSDtfsCounter, 18 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 108 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 150 SdHoareTripleChecker+Invalid, 111 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 108 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-18 20:53:59,327 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 150 Invalid, 111 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 108 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-18 20:53:59,328 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2021-12-18 20:53:59,330 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 193. [2021-12-18 20:53:59,330 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 193 states, 158 states have (on average 1.259493670886076) internal successors, (199), 176 states have internal predecessors, (199), 12 states have call successors, (12), 4 states have call predecessors, (12), 4 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2021-12-18 20:53:59,330 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 193 states to 193 states and 223 transitions. [2021-12-18 20:53:59,331 INFO L78 Accepts]: Start accepts. Automaton has 193 states and 223 transitions. Word has length 127 [2021-12-18 20:53:59,331 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:53:59,331 INFO L470 AbstractCegarLoop]: Abstraction has 193 states and 223 transitions. [2021-12-18 20:53:59,331 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 14.666666666666666) internal successors, (44), 3 states have internal predecessors, (44), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-12-18 20:53:59,331 INFO L276 IsEmpty]: Start isEmpty. Operand 193 states and 223 transitions. [2021-12-18 20:53:59,332 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2021-12-18 20:53:59,332 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:53:59,333 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 20:53:59,333 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2021-12-18 20:53:59,333 INFO L402 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 55 more)] === [2021-12-18 20:53:59,333 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:53:59,333 INFO L85 PathProgramCache]: Analyzing trace with hash 1399123591, now seen corresponding path program 1 times [2021-12-18 20:53:59,333 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-18 20:53:59,334 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [653541957] [2021-12-18 20:53:59,334 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:53:59,334 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-18 20:53:59,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:53:59,413 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2021-12-18 20:53:59,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:53:59,423 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 28 [2021-12-18 20:53:59,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:53:59,433 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 45 [2021-12-18 20:53:59,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:53:59,444 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 64 [2021-12-18 20:53:59,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:53:59,452 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 83 [2021-12-18 20:53:59,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:53:59,460 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 102 [2021-12-18 20:53:59,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:53:59,469 INFO L134 CoverageAnalysis]: Checked inductivity of 209 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 209 trivial. 0 not checked. [2021-12-18 20:53:59,469 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-18 20:53:59,469 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [653541957] [2021-12-18 20:53:59,469 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [653541957] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-18 20:53:59,469 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-18 20:53:59,469 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-12-18 20:53:59,470 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2126596453] [2021-12-18 20:53:59,470 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-18 20:53:59,470 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-12-18 20:53:59,470 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-18 20:53:59,470 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-12-18 20:53:59,471 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-12-18 20:53:59,471 INFO L87 Difference]: Start difference. First operand 193 states and 223 transitions. Second operand has 4 states, 3 states have (on average 14.666666666666666) internal successors, (44), 3 states have internal predecessors, (44), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-12-18 20:53:59,551 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:53:59,551 INFO L93 Difference]: Finished difference Result 194 states and 223 transitions. [2021-12-18 20:53:59,551 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-12-18 20:53:59,552 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 14.666666666666666) internal successors, (44), 3 states have internal predecessors, (44), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 127 [2021-12-18 20:53:59,552 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:53:59,552 INFO L225 Difference]: With dead ends: 194 [2021-12-18 20:53:59,552 INFO L226 Difference]: Without dead ends: 194 [2021-12-18 20:53:59,552 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-12-18 20:53:59,554 INFO L933 BasicCegarLoop]: 82 mSDtfsCounter, 8 mSDsluCounter, 79 mSDsCounter, 0 mSdLazyCounter, 105 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 161 SdHoareTripleChecker+Invalid, 106 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 105 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-18 20:53:59,554 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 161 Invalid, 106 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 105 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-18 20:53:59,554 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 194 states. [2021-12-18 20:53:59,557 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 194 to 193. [2021-12-18 20:53:59,558 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 193 states, 158 states have (on average 1.2531645569620253) internal successors, (198), 176 states have internal predecessors, (198), 12 states have call successors, (12), 4 states have call predecessors, (12), 4 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2021-12-18 20:53:59,558 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 193 states to 193 states and 222 transitions. [2021-12-18 20:53:59,559 INFO L78 Accepts]: Start accepts. Automaton has 193 states and 222 transitions. Word has length 127 [2021-12-18 20:53:59,559 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:53:59,559 INFO L470 AbstractCegarLoop]: Abstraction has 193 states and 222 transitions. [2021-12-18 20:53:59,559 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 14.666666666666666) internal successors, (44), 3 states have internal predecessors, (44), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-12-18 20:53:59,559 INFO L276 IsEmpty]: Start isEmpty. Operand 193 states and 222 transitions. [2021-12-18 20:53:59,560 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2021-12-18 20:53:59,560 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:53:59,560 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 20:53:59,560 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2021-12-18 20:53:59,561 INFO L402 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr19REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 55 more)] === [2021-12-18 20:53:59,561 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:53:59,561 INFO L85 PathProgramCache]: Analyzing trace with hash 232960854, now seen corresponding path program 1 times [2021-12-18 20:53:59,561 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-18 20:53:59,561 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [844005433] [2021-12-18 20:53:59,561 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:53:59,562 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-18 20:53:59,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:53:59,809 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2021-12-18 20:53:59,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:53:59,817 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 28 [2021-12-18 20:53:59,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:53:59,828 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 45 [2021-12-18 20:53:59,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:53:59,836 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 64 [2021-12-18 20:53:59,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:53:59,846 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 83 [2021-12-18 20:53:59,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:53:59,855 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 102 [2021-12-18 20:53:59,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:53:59,893 INFO L134 CoverageAnalysis]: Checked inductivity of 209 backedges. 68 proven. 0 refuted. 0 times theorem prover too weak. 141 trivial. 0 not checked. [2021-12-18 20:53:59,893 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-18 20:53:59,893 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [844005433] [2021-12-18 20:53:59,893 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [844005433] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-18 20:53:59,893 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-18 20:53:59,894 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-12-18 20:53:59,894 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2128877865] [2021-12-18 20:53:59,894 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-18 20:53:59,894 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-12-18 20:53:59,894 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-18 20:53:59,894 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-12-18 20:53:59,894 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=71, Unknown=0, NotChecked=0, Total=90 [2021-12-18 20:53:59,895 INFO L87 Difference]: Start difference. First operand 193 states and 222 transitions. Second operand has 10 states, 9 states have (on average 6.888888888888889) internal successors, (62), 9 states have internal predecessors, (62), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-12-18 20:54:00,153 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:54:00,153 INFO L93 Difference]: Finished difference Result 215 states and 243 transitions. [2021-12-18 20:54:00,154 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-12-18 20:54:00,154 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 6.888888888888889) internal successors, (62), 9 states have internal predecessors, (62), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 129 [2021-12-18 20:54:00,154 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:54:00,155 INFO L225 Difference]: With dead ends: 215 [2021-12-18 20:54:00,155 INFO L226 Difference]: Without dead ends: 215 [2021-12-18 20:54:00,155 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=46, Invalid=164, Unknown=0, NotChecked=0, Total=210 [2021-12-18 20:54:00,156 INFO L933 BasicCegarLoop]: 59 mSDtfsCounter, 129 mSDsluCounter, 289 mSDsCounter, 0 mSdLazyCounter, 405 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 129 SdHoareTripleChecker+Valid, 348 SdHoareTripleChecker+Invalid, 419 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 405 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-18 20:54:00,156 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [129 Valid, 348 Invalid, 419 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 405 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-18 20:54:00,156 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 215 states. [2021-12-18 20:54:00,159 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 215 to 195. [2021-12-18 20:54:00,159 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 195 states, 160 states have (on average 1.25625) internal successors, (201), 178 states have internal predecessors, (201), 12 states have call successors, (12), 4 states have call predecessors, (12), 4 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2021-12-18 20:54:00,160 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 195 states to 195 states and 225 transitions. [2021-12-18 20:54:00,160 INFO L78 Accepts]: Start accepts. Automaton has 195 states and 225 transitions. Word has length 129 [2021-12-18 20:54:00,160 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:54:00,160 INFO L470 AbstractCegarLoop]: Abstraction has 195 states and 225 transitions. [2021-12-18 20:54:00,161 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 6.888888888888889) internal successors, (62), 9 states have internal predecessors, (62), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-12-18 20:54:00,161 INFO L276 IsEmpty]: Start isEmpty. Operand 195 states and 225 transitions. [2021-12-18 20:54:00,162 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2021-12-18 20:54:00,162 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:54:00,162 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 20:54:00,162 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2021-12-18 20:54:00,162 INFO L402 AbstractCegarLoop]: === Iteration 44 === Targeting ULTIMATE.startErr20REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 55 more)] === [2021-12-18 20:54:00,163 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:54:00,163 INFO L85 PathProgramCache]: Analyzing trace with hash 232960855, now seen corresponding path program 1 times [2021-12-18 20:54:00,163 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-18 20:54:00,163 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [787674753] [2021-12-18 20:54:00,163 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:54:00,163 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-18 20:54:00,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:54:00,441 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2021-12-18 20:54:00,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:54:00,498 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 28 [2021-12-18 20:54:00,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:54:00,533 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 45 [2021-12-18 20:54:00,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:54:00,949 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 64 [2021-12-18 20:54:00,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:54:00,970 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 83 [2021-12-18 20:54:00,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:54:00,986 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 102 [2021-12-18 20:54:00,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:54:01,002 INFO L134 CoverageAnalysis]: Checked inductivity of 209 backedges. 18 proven. 95 refuted. 0 times theorem prover too weak. 96 trivial. 0 not checked. [2021-12-18 20:54:01,003 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-18 20:54:01,003 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [787674753] [2021-12-18 20:54:01,007 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [787674753] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 20:54:01,007 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1247814213] [2021-12-18 20:54:01,007 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:54:01,007 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-18 20:54:01,008 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-18 20:54:01,008 INFO L229 MonitoredProcess]: Starting monitored process 31 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-18 20:54:01,010 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2021-12-18 20:54:01,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:54:01,626 INFO L263 TraceCheckSpWp]: Trace formula consists of 1052 conjuncts, 34 conjunts are in the unsatisfiable core [2021-12-18 20:54:01,629 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:54:01,636 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-18 20:54:01,645 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-18 20:54:01,764 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-18 20:54:01,871 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-18 20:54:01,991 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-18 20:54:02,109 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-18 20:54:02,230 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-18 20:54:02,348 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-18 20:54:02,361 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-18 20:54:02,362 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2021-12-18 20:54:02,378 INFO L134 CoverageAnalysis]: Checked inductivity of 209 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 209 trivial. 0 not checked. [2021-12-18 20:54:02,379 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-18 20:54:02,379 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1247814213] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-18 20:54:02,379 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-12-18 20:54:02,379 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [22] total 25 [2021-12-18 20:54:02,379 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1949166625] [2021-12-18 20:54:02,379 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-18 20:54:02,379 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-12-18 20:54:02,379 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-18 20:54:02,379 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-12-18 20:54:02,380 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=548, Unknown=0, NotChecked=0, Total=650 [2021-12-18 20:54:02,380 INFO L87 Difference]: Start difference. First operand 195 states and 225 transitions. Second operand has 6 states, 6 states have (on average 7.666666666666667) internal successors, (46), 4 states have internal predecessors, (46), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-12-18 20:54:02,453 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:54:02,453 INFO L93 Difference]: Finished difference Result 193 states and 220 transitions. [2021-12-18 20:54:02,454 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-12-18 20:54:02,454 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 7.666666666666667) internal successors, (46), 4 states have internal predecessors, (46), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 129 [2021-12-18 20:54:02,454 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:54:02,454 INFO L225 Difference]: With dead ends: 193 [2021-12-18 20:54:02,455 INFO L226 Difference]: Without dead ends: 193 [2021-12-18 20:54:02,455 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 168 GetRequests, 135 SyntacticMatches, 6 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 385 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=119, Invalid=693, Unknown=0, NotChecked=0, Total=812 [2021-12-18 20:54:02,455 INFO L933 BasicCegarLoop]: 46 mSDtfsCounter, 67 mSDsluCounter, 85 mSDsCounter, 0 mSdLazyCounter, 62 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 67 SdHoareTripleChecker+Valid, 131 SdHoareTripleChecker+Invalid, 120 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 62 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 50 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-18 20:54:02,455 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [67 Valid, 131 Invalid, 120 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 62 Invalid, 0 Unknown, 50 Unchecked, 0.0s Time] [2021-12-18 20:54:02,456 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 193 states. [2021-12-18 20:54:02,458 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 193 to 192. [2021-12-18 20:54:02,458 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 192 states, 157 states have (on average 1.2484076433121019) internal successors, (196), 175 states have internal predecessors, (196), 12 states have call successors, (12), 4 states have call predecessors, (12), 4 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2021-12-18 20:54:02,459 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 192 states to 192 states and 220 transitions. [2021-12-18 20:54:02,459 INFO L78 Accepts]: Start accepts. Automaton has 192 states and 220 transitions. Word has length 129 [2021-12-18 20:54:02,459 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:54:02,459 INFO L470 AbstractCegarLoop]: Abstraction has 192 states and 220 transitions. [2021-12-18 20:54:02,459 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 7.666666666666667) internal successors, (46), 4 states have internal predecessors, (46), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-12-18 20:54:02,459 INFO L276 IsEmpty]: Start isEmpty. Operand 192 states and 220 transitions. [2021-12-18 20:54:02,460 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2021-12-18 20:54:02,460 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:54:02,460 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 20:54:02,482 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2021-12-18 20:54:02,667 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable43 [2021-12-18 20:54:02,668 INFO L402 AbstractCegarLoop]: === Iteration 45 === Targeting ULTIMATE.startErr14ASSERT_VIOLATIONMEMORY_FREE === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 55 more)] === [2021-12-18 20:54:02,668 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:54:02,668 INFO L85 PathProgramCache]: Analyzing trace with hash 233007526, now seen corresponding path program 1 times [2021-12-18 20:54:02,668 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-18 20:54:02,668 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [354943900] [2021-12-18 20:54:02,668 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:54:02,668 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-18 20:54:02,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:54:03,160 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2021-12-18 20:54:03,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:54:03,328 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 28 [2021-12-18 20:54:03,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:54:03,743 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 45 [2021-12-18 20:54:03,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:54:04,693 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 64 [2021-12-18 20:54:04,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:54:05,672 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 83 [2021-12-18 20:54:05,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:54:06,910 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 102 [2021-12-18 20:54:06,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:54:08,552 INFO L134 CoverageAnalysis]: Checked inductivity of 209 backedges. 15 proven. 108 refuted. 0 times theorem prover too weak. 86 trivial. 0 not checked. [2021-12-18 20:54:08,552 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-18 20:54:08,553 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [354943900] [2021-12-18 20:54:08,553 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [354943900] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 20:54:08,553 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [586029802] [2021-12-18 20:54:08,553 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:54:08,553 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-18 20:54:08,553 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-18 20:54:08,554 INFO L229 MonitoredProcess]: Starting monitored process 32 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-18 20:54:08,555 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2021-12-18 20:54:09,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:54:09,234 INFO L263 TraceCheckSpWp]: Trace formula consists of 1049 conjuncts, 194 conjunts are in the unsatisfiable core [2021-12-18 20:54:09,241 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:54:09,247 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:54:09,323 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-12-18 20:54:09,324 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 17 treesize of output 21 [2021-12-18 20:54:09,700 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-12-18 20:54:09,775 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:54:09,775 INFO L388 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 20 [2021-12-18 20:54:09,856 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-18 20:54:09,856 INFO L388 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 23 treesize of output 27 [2021-12-18 20:54:09,861 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:54:09,861 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 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 13 treesize of output 7 [2021-12-18 20:54:09,951 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-18 20:54:09,951 INFO L388 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 28 treesize of output 32 [2021-12-18 20:54:10,106 INFO L354 Elim1Store]: treesize reduction 41, result has 25.5 percent of original size [2021-12-18 20:54:10,107 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 22 treesize of output 28 [2021-12-18 20:54:10,534 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-12-18 20:54:10,606 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-18 20:54:10,607 INFO L388 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 16 treesize of output 22 [2021-12-18 20:54:10,614 INFO L388 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 7 treesize of output 3 [2021-12-18 20:54:10,709 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-18 20:54:10,709 INFO L388 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 20 treesize of output 26 [2021-12-18 20:54:10,921 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:54:10,922 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:54:10,923 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 41 treesize of output 34 [2021-12-18 20:54:10,927 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-18 20:54:10,943 INFO L354 Elim1Store]: treesize reduction 49, result has 34.7 percent of original size [2021-12-18 20:54:10,943 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 34 treesize of output 46 [2021-12-18 20:54:11,783 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-12-18 20:54:11,891 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:54:11,892 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:54:11,914 INFO L354 Elim1Store]: treesize reduction 165, result has 18.3 percent of original size [2021-12-18 20:54:11,915 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 3 case distinctions, treesize of input 50 treesize of output 54 [2021-12-18 20:54:11,946 INFO L354 Elim1Store]: treesize reduction 113, result has 31.9 percent of original size [2021-12-18 20:54:11,946 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 45 treesize of output 76 [2021-12-18 20:54:11,950 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 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 48 treesize of output 24 [2021-12-18 20:54:12,707 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-12-18 20:54:12,824 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:54:12,825 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:54:12,847 INFO L354 Elim1Store]: treesize reduction 140, result has 30.7 percent of original size [2021-12-18 20:54:12,848 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 6 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 3 case distinctions, treesize of input 50 treesize of output 79 [2021-12-18 20:54:12,851 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:54:12,853 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 58 treesize of output 34 [2021-12-18 20:54:12,861 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-18 20:54:12,885 INFO L354 Elim1Store]: treesize reduction 79, result has 34.2 percent of original size [2021-12-18 20:54:12,885 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 6 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 64 [2021-12-18 20:54:14,058 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:54:14,060 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-18 20:54:14,061 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 60 treesize of output 30 [2021-12-18 20:54:14,066 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:54:14,066 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:54:14,067 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:54:14,067 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 9 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 33 [2021-12-18 20:54:14,106 INFO L354 Elim1Store]: treesize reduction 72, result has 33.9 percent of original size [2021-12-18 20:54:14,107 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 6 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 8 case distinctions, treesize of input 32 treesize of output 57 [2021-12-18 20:54:14,865 WARN L860 $PredicateComparison]: unable to prove that (exists ((v_ArrVal_12965 (Array Int Int)) (|append_#t~mem8.base| Int) (append_~node~0.base Int) (v_ArrVal_12968 (Array Int Int)) (|append_#t~mem8.offset| Int)) (and (= |c_#memory_$Pointer$.offset| (store (let ((.cse0 (store |c_old(#memory_$Pointer$.offset)| append_~node~0.base v_ArrVal_12965))) (store .cse0 |append_#t~mem8.base| (store (select .cse0 |append_#t~mem8.base|) (+ |append_#t~mem8.offset| 5) 0))) |c_append_#in~head.base| v_ArrVal_12968)) (= (select |c_old(#valid)| append_~node~0.base) 0))) is different from true [2021-12-18 20:54:14,900 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:54:14,901 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:54:14,955 INFO L354 Elim1Store]: treesize reduction 80, result has 47.7 percent of original size [2021-12-18 20:54:14,956 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 2 select indices, 2 select index equivalence classes, 9 disjoint index pairs (out of 1 index pairs), introduced 4 new quantified variables, introduced 9 case distinctions, treesize of input 63 treesize of output 111 [2021-12-18 20:54:14,989 INFO L354 Elim1Store]: treesize reduction 20, result has 51.2 percent of original size [2021-12-18 20:54:14,989 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 6 select indices, 6 select index equivalence classes, 10 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 5 case distinctions, treesize of input 31 treesize of output 39 [2021-12-18 20:54:15,011 INFO L388 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 10 treesize of output 9 [2021-12-18 20:54:15,033 INFO L388 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 10 treesize of output 9 [2021-12-18 20:54:16,021 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 19 [2021-12-18 20:54:16,028 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 43 treesize of output 33 [2021-12-18 20:54:16,031 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: Should have been eliminated by DER [2021-12-18 20:54:16,031 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-12-18 20:54:16,031 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2021-12-18 20:54:16,031 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [360427715] [2021-12-18 20:54:16,031 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-12-18 20:54:16,031 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-12-18 20:54:16,031 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-18 20:54:16,032 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-12-18 20:54:16,032 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=440, Invalid=4392, Unknown=142, NotChecked=138, Total=5112 [2021-12-18 20:54:16,032 INFO L87 Difference]: Start difference. First operand 192 states and 220 transitions. Second operand has 27 states, 26 states have (on average 3.076923076923077) internal successors, (80), 26 states have internal predecessors, (80), 2 states have call successors, (2), 1 states have call predecessors, (2), 4 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-12-18 20:54:16,033 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-12-18 20:54:16,033 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 180 GetRequests, 102 SyntacticMatches, 8 SemanticMatches, 70 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 2317 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=440, Invalid=4392, Unknown=142, NotChecked=138, Total=5112 [2021-12-18 20:54:16,033 INFO L933 BasicCegarLoop]: 1 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, 1 SdHoareTripleChecker+Invalid, 1 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 [2021-12-18 20:54:16,033 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 1 Invalid, 1 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-18 20:54:16,055 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Ended with exit code 0 [2021-12-18 20:54:16,235 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44,32 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-18 20:54:16,236 FATAL L? ?]: The Plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction has thrown an exception: java.lang.IllegalStateException: ManagedScript already locked by de.uni_freiburg.informatik.ultimate.lib.smtlibutils.IncrementalPlicationChecker@4fc84af9 at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.ManagedScript.lock(ManagedScript.java:82) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.hoaretriple.IncrementalHoareTripleChecker.assertCodeBlock(IncrementalHoareTripleChecker.java:360) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.hoaretriple.IncrementalHoareTripleChecker.prepareAssertionStackAndAddTransition(IncrementalHoareTripleChecker.java:206) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.hoaretriple.IncrementalHoareTripleChecker.checkInternal(IncrementalHoareTripleChecker.java:131) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.hoaretriple.ChainingHoareTripleChecker$ProtectedHtc.checkInternal(ChainingHoareTripleChecker.java:455) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.hoaretriple.ChainingHoareTripleChecker.checkInternal(ChainingHoareTripleChecker.java:103) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.hoaretriple.CachingHoareTripleChecker.checkInternal(CachingHoareTripleChecker.java:95) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.interpolantautomata.transitionappender.AbstractInterpolantAutomaton$InternalSuccessorComputationHelper.computeSuccWithSolver(AbstractInterpolantAutomaton.java:357) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.interpolantautomata.transitionappender.DeterministicInterpolantAutomaton.addOtherSuccessors(DeterministicInterpolantAutomaton.java:198) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.interpolantautomata.transitionappender.BasicAbstractInterpolantAutomaton.computeSuccs(BasicAbstractInterpolantAutomaton.java:78) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.interpolantautomata.transitionappender.BasicAbstractInterpolantAutomaton.computeSuccs(BasicAbstractInterpolantAutomaton.java:1) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.interpolantautomata.transitionappender.AbstractInterpolantAutomaton.internalSuccessors(AbstractInterpolantAutomaton.java:233) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.interpolantautomata.transitionappender.AbstractInterpolantAutomaton.internalSuccessors(AbstractInterpolantAutomaton.java:1) at de.uni_freiburg.informatik.ultimate.automata.nestedword.operations.TotalizeNwa.internalSuccessors(TotalizeNwa.java:213) at de.uni_freiburg.informatik.ultimate.automata.nestedword.operations.ComplementDeterministicNwa.internalSuccessors(ComplementDeterministicNwa.java:121) at de.uni_freiburg.informatik.ultimate.automata.nestedword.operations.ProductNwa.internalSuccessors(ProductNwa.java:216) at de.uni_freiburg.informatik.ultimate.automata.nestedword.operations.ProductNwa.internalSuccessors(ProductNwa.java:208) at de.uni_freiburg.informatik.ultimate.automata.nestedword.reachablestates.NestedWordAutomatonReachableStates$ReachableStatesComputation.addInternalsAndSuccessors(NestedWordAutomatonReachableStates.java:1058) at de.uni_freiburg.informatik.ultimate.automata.nestedword.reachablestates.NestedWordAutomatonReachableStates$ReachableStatesComputation.(NestedWordAutomatonReachableStates.java:960) at de.uni_freiburg.informatik.ultimate.automata.nestedword.reachablestates.NestedWordAutomatonReachableStates.(NestedWordAutomatonReachableStates.java:182) at de.uni_freiburg.informatik.ultimate.automata.nestedword.operations.Difference.computeDifference(Difference.java:137) at de.uni_freiburg.informatik.ultimate.automata.nestedword.operations.Difference.(Difference.java:90) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.computeAutomataDifference(BasicCegarLoop.java:868) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.refineAbstraction(BasicCegarLoop.java:784) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.refineAbstractionInternal(AbstractCegarLoop.java:462) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:420) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-12-18 20:54:16,246 INFO L158 Benchmark]: Toolchain (without parser) took 496039.75ms. Allocated memory was 94.4MB in the beginning and 1.2GB in the end (delta: 1.1GB). Free memory was 62.8MB in the beginning and 537.8MB in the end (delta: -475.0MB). Peak memory consumption was 663.2MB. Max. memory is 16.1GB. [2021-12-18 20:54:16,246 INFO L158 Benchmark]: CDTParser took 0.10ms. Allocated memory is still 94.4MB. Free memory was 51.3MB in the beginning and 51.2MB in the end (delta: 84.1kB). There was no memory consumed. Max. memory is 16.1GB. [2021-12-18 20:54:16,246 INFO L158 Benchmark]: CACSL2BoogieTranslator took 439.73ms. Allocated memory is still 94.4MB. Free memory was 62.6MB in the beginning and 64.5MB in the end (delta: -1.9MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. [2021-12-18 20:54:16,246 INFO L158 Benchmark]: Boogie Procedure Inliner took 66.06ms. Allocated memory is still 94.4MB. Free memory was 64.5MB in the beginning and 62.5MB in the end (delta: 2.0MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-12-18 20:54:16,246 INFO L158 Benchmark]: Boogie Preprocessor took 41.31ms. Allocated memory is still 94.4MB. Free memory was 62.2MB in the beginning and 60.7MB in the end (delta: 1.5MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-12-18 20:54:16,246 INFO L158 Benchmark]: RCFGBuilder took 523.79ms. Allocated memory was 94.4MB in the beginning and 119.5MB in the end (delta: 25.2MB). Free memory was 60.7MB in the beginning and 90.4MB in the end (delta: -29.7MB). Peak memory consumption was 19.8MB. Max. memory is 16.1GB. [2021-12-18 20:54:16,246 INFO L158 Benchmark]: TraceAbstraction took 494962.23ms. Allocated memory was 119.5MB in the beginning and 1.2GB in the end (delta: 1.1GB). Free memory was 90.0MB in the beginning and 537.8MB in the end (delta: -447.8MB). Peak memory consumption was 667.0MB. Max. memory is 16.1GB. [2021-12-18 20:54:16,248 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.10ms. Allocated memory is still 94.4MB. Free memory was 51.3MB in the beginning and 51.2MB in the end (delta: 84.1kB). There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 439.73ms. Allocated memory is still 94.4MB. Free memory was 62.6MB in the beginning and 64.5MB in the end (delta: -1.9MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 66.06ms. Allocated memory is still 94.4MB. Free memory was 64.5MB in the beginning and 62.5MB in the end (delta: 2.0MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Boogie Preprocessor took 41.31ms. Allocated memory is still 94.4MB. Free memory was 62.2MB in the beginning and 60.7MB in the end (delta: 1.5MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * RCFGBuilder took 523.79ms. Allocated memory was 94.4MB in the beginning and 119.5MB in the end (delta: 25.2MB). Free memory was 60.7MB in the beginning and 90.4MB in the end (delta: -29.7MB). Peak memory consumption was 19.8MB. Max. memory is 16.1GB. * TraceAbstraction took 494962.23ms. Allocated memory was 119.5MB in the beginning and 1.2GB in the end (delta: 1.1GB). Free memory was 90.0MB in the beginning and 537.8MB in the end (delta: -447.8MB). Peak memory consumption was 667.0MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - ExceptionOrErrorResult: IllegalStateException: ManagedScript already locked by de.uni_freiburg.informatik.ultimate.lib.smtlibutils.IncrementalPlicationChecker@4fc84af9 de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: IllegalStateException: ManagedScript already locked by de.uni_freiburg.informatik.ultimate.lib.smtlibutils.IncrementalPlicationChecker@4fc84af9: de.uni_freiburg.informatik.ultimate.lib.smtlibutils.ManagedScript.lock(ManagedScript.java:82) RESULT: Ultimate could not prove your program: Toolchain returned no result. [2021-12-18 20:54:16,407 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request... --- End real Ultimate output --- Execution finished normally Using bit-precise analysis Retrying with bit-precise analysis ### Bit-precise run ### Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx15G -Xms4m -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/AutomizerMemDerefMemtrack.xml -i ../sv-benchmarks/c/memsafety-ext2/length_test03-1.i -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 6e9221de91e231efa38b63f264828813e89f68c8ac306a629b3513c0e7bf1ed0 --- Real Ultimate output --- This is Ultimate 0.2.2-tmp.no-commuhash-c3fed41 [2021-12-18 20:54:18,260 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-12-18 20:54:18,263 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-12-18 20:54:18,301 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-12-18 20:54:18,302 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-12-18 20:54:18,306 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-12-18 20:54:18,307 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-12-18 20:54:18,313 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-12-18 20:54:18,315 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-12-18 20:54:18,321 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-12-18 20:54:18,323 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-12-18 20:54:18,327 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-12-18 20:54:18,337 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-12-18 20:54:18,339 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-12-18 20:54:18,341 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-12-18 20:54:18,343 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-12-18 20:54:18,343 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-12-18 20:54:18,344 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-12-18 20:54:18,346 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-12-18 20:54:18,347 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-12-18 20:54:18,348 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-12-18 20:54:18,349 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-12-18 20:54:18,350 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-12-18 20:54:18,351 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-12-18 20:54:18,353 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-12-18 20:54:18,353 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-12-18 20:54:18,354 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-12-18 20:54:18,354 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-12-18 20:54:18,355 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-12-18 20:54:18,356 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-12-18 20:54:18,356 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-12-18 20:54:18,357 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-12-18 20:54:18,357 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-12-18 20:54:18,358 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-12-18 20:54:18,360 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-12-18 20:54:18,360 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-12-18 20:54:18,361 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-12-18 20:54:18,361 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-12-18 20:54:18,361 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-12-18 20:54:18,363 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-12-18 20:54:18,363 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-12-18 20:54:18,366 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Bitvector.epf [2021-12-18 20:54:18,401 INFO L113 SettingsManager]: Loading preferences was successful [2021-12-18 20:54:18,402 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-12-18 20:54:18,403 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-12-18 20:54:18,403 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-12-18 20:54:18,404 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-12-18 20:54:18,404 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-12-18 20:54:18,405 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-12-18 20:54:18,405 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-12-18 20:54:18,405 INFO L138 SettingsManager]: * Use SBE=true [2021-12-18 20:54:18,406 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-12-18 20:54:18,406 INFO L138 SettingsManager]: * sizeof long=4 [2021-12-18 20:54:18,407 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-12-18 20:54:18,407 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-12-18 20:54:18,407 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-12-18 20:54:18,407 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-12-18 20:54:18,407 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-12-18 20:54:18,408 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-12-18 20:54:18,408 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-12-18 20:54:18,408 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-12-18 20:54:18,408 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-12-18 20:54:18,408 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-12-18 20:54:18,409 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-12-18 20:54:18,409 INFO L138 SettingsManager]: * sizeof long double=12 [2021-12-18 20:54:18,409 INFO L138 SettingsManager]: * Use constant arrays=true [2021-12-18 20:54:18,409 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-12-18 20:54:18,409 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-12-18 20:54:18,410 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-12-18 20:54:18,410 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-18 20:54:18,410 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-12-18 20:54:18,410 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-12-18 20:54:18,410 INFO L138 SettingsManager]: * Trace refinement strategy=WOLF [2021-12-18 20:54:18,411 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-12-18 20:54:18,411 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-12-18 20:54:18,411 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-12-18 20:54:18,412 INFO L138 SettingsManager]: * Logic for external solver=AUFBV WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 6e9221de91e231efa38b63f264828813e89f68c8ac306a629b3513c0e7bf1ed0 [2021-12-18 20:54:18,724 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-12-18 20:54:18,753 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-12-18 20:54:18,756 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-12-18 20:54:18,757 INFO L271 PluginConnector]: Initializing CDTParser... [2021-12-18 20:54:18,758 INFO L275 PluginConnector]: CDTParser initialized [2021-12-18 20:54:18,759 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/memsafety-ext2/length_test03-1.i [2021-12-18 20:54:18,824 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6d06d581f/c1f7b00c85b34da988e2328771e4aeaa/FLAG691a3da78 [2021-12-18 20:54:19,345 INFO L306 CDTParser]: Found 1 translation units. [2021-12-18 20:54:19,346 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/memsafety-ext2/length_test03-1.i [2021-12-18 20:54:19,358 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6d06d581f/c1f7b00c85b34da988e2328771e4aeaa/FLAG691a3da78 [2021-12-18 20:54:19,838 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6d06d581f/c1f7b00c85b34da988e2328771e4aeaa [2021-12-18 20:54:19,840 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-12-18 20:54:19,841 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-12-18 20:54:19,842 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-12-18 20:54:19,842 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-12-18 20:54:19,845 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-12-18 20:54:19,846 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.12 08:54:19" (1/1) ... [2021-12-18 20:54:19,847 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7c8c57e5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.12 08:54:19, skipping insertion in model container [2021-12-18 20:54:19,847 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.12 08:54:19" (1/1) ... [2021-12-18 20:54:19,853 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-12-18 20:54:19,893 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-12-18 20:54:20,093 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-18 20:54:20,102 INFO L203 MainTranslator]: Completed pre-run [2021-12-18 20:54:20,169 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-18 20:54:20,206 INFO L208 MainTranslator]: Completed translation [2021-12-18 20:54:20,207 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.12 08:54:20 WrapperNode [2021-12-18 20:54:20,207 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-12-18 20:54:20,208 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-12-18 20:54:20,209 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-12-18 20:54:20,209 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-12-18 20:54:20,216 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.12 08:54:20" (1/1) ... [2021-12-18 20:54:20,249 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.12 08:54:20" (1/1) ... [2021-12-18 20:54:20,288 INFO L137 Inliner]: procedures = 124, calls = 38, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 96 [2021-12-18 20:54:20,289 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-12-18 20:54:20,290 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-12-18 20:54:20,290 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-12-18 20:54:20,290 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-12-18 20:54:20,297 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.12 08:54:20" (1/1) ... [2021-12-18 20:54:20,297 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.12 08:54:20" (1/1) ... [2021-12-18 20:54:20,311 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.12 08:54:20" (1/1) ... [2021-12-18 20:54:20,312 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.12 08:54:20" (1/1) ... [2021-12-18 20:54:20,324 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.12 08:54:20" (1/1) ... [2021-12-18 20:54:20,334 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.12 08:54:20" (1/1) ... [2021-12-18 20:54:20,339 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.12 08:54:20" (1/1) ... [2021-12-18 20:54:20,342 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-12-18 20:54:20,343 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-12-18 20:54:20,344 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-12-18 20:54:20,344 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-12-18 20:54:20,345 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.12 08:54:20" (1/1) ... [2021-12-18 20:54:20,351 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-18 20:54:20,360 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-18 20:54:20,374 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-12-18 20:54:20,376 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-12-18 20:54:20,408 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-12-18 20:54:20,409 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-12-18 20:54:20,409 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-12-18 20:54:20,409 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-12-18 20:54:20,409 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE1 [2021-12-18 20:54:20,410 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-12-18 20:54:20,410 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-12-18 20:54:20,410 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-12-18 20:54:20,410 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-12-18 20:54:20,410 INFO L130 BoogieDeclarations]: Found specification of procedure append [2021-12-18 20:54:20,410 INFO L138 BoogieDeclarations]: Found implementation of procedure append [2021-12-18 20:54:20,550 INFO L236 CfgBuilder]: Building ICFG [2021-12-18 20:54:20,552 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-12-18 20:54:21,133 INFO L277 CfgBuilder]: Performing block encoding [2021-12-18 20:54:21,139 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-12-18 20:54:21,139 INFO L301 CfgBuilder]: Removed 4 assume(true) statements. [2021-12-18 20:54:21,141 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.12 08:54:21 BoogieIcfgContainer [2021-12-18 20:54:21,141 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-12-18 20:54:21,142 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-12-18 20:54:21,142 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-12-18 20:54:21,146 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-12-18 20:54:21,147 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.12 08:54:19" (1/3) ... [2021-12-18 20:54:21,147 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@57f2d865 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.12 08:54:21, skipping insertion in model container [2021-12-18 20:54:21,148 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.12 08:54:20" (2/3) ... [2021-12-18 20:54:21,148 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@57f2d865 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.12 08:54:21, skipping insertion in model container [2021-12-18 20:54:21,148 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.12 08:54:21" (3/3) ... [2021-12-18 20:54:21,149 INFO L111 eAbstractionObserver]: Analyzing ICFG length_test03-1.i [2021-12-18 20:54:21,154 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-12-18 20:54:21,154 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 59 error locations. [2021-12-18 20:54:21,199 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-12-18 20:54:21,208 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=false, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-12-18 20:54:21,209 INFO L340 AbstractCegarLoop]: Starting to check reachability of 59 error locations. [2021-12-18 20:54:21,237 INFO L276 IsEmpty]: Start isEmpty. Operand has 127 states, 64 states have (on average 2.078125) internal successors, (133), 123 states have internal predecessors, (133), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-18 20:54:21,243 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2021-12-18 20:54:21,243 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:54:21,244 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1] [2021-12-18 20:54:21,245 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 55 more)] === [2021-12-18 20:54:21,250 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:54:21,250 INFO L85 PathProgramCache]: Analyzing trace with hash 29857, now seen corresponding path program 1 times [2021-12-18 20:54:21,260 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-18 20:54:21,261 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1851855984] [2021-12-18 20:54:21,261 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:54:21,262 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-18 20:54:21,263 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-18 20:54:21,267 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-18 20:54:21,277 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-12-18 20:54:21,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:54:21,344 INFO L263 TraceCheckSpWp]: Trace formula consists of 23 conjuncts, 3 conjunts are in the unsatisfiable core [2021-12-18 20:54:21,349 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:54:21,430 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:54:21,439 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 20:54:21,440 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-18 20:54:21,440 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-18 20:54:21,441 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1851855984] [2021-12-18 20:54:21,441 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1851855984] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-18 20:54:21,441 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-18 20:54:21,441 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-18 20:54:21,443 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1717632770] [2021-12-18 20:54:21,444 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-18 20:54:21,447 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-18 20:54:21,447 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-18 20:54:21,469 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-18 20:54:21,470 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-18 20:54:21,472 INFO L87 Difference]: Start difference. First operand has 127 states, 64 states have (on average 2.078125) internal successors, (133), 123 states have internal predecessors, (133), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Second operand has 3 states, 2 states have (on average 1.5) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-18 20:54:21,733 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:54:21,733 INFO L93 Difference]: Finished difference Result 164 states and 173 transitions. [2021-12-18 20:54:21,734 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-18 20:54:21,736 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 3 states have internal predecessors, (3), 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 3 [2021-12-18 20:54:21,736 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:54:21,743 INFO L225 Difference]: With dead ends: 164 [2021-12-18 20:54:21,744 INFO L226 Difference]: Without dead ends: 162 [2021-12-18 20:54:21,745 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-18 20:54:21,749 INFO L933 BasicCegarLoop]: 107 mSDtfsCounter, 53 mSDsluCounter, 61 mSDsCounter, 0 mSdLazyCounter, 77 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 168 SdHoareTripleChecker+Invalid, 80 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 77 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-18 20:54:21,749 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [53 Valid, 168 Invalid, 80 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 77 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-18 20:54:21,763 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2021-12-18 20:54:21,781 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 123. [2021-12-18 20:54:21,782 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 123 states, 63 states have (on average 1.9841269841269842) internal successors, (125), 119 states have internal predecessors, (125), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-18 20:54:21,785 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 129 transitions. [2021-12-18 20:54:21,786 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 129 transitions. Word has length 3 [2021-12-18 20:54:21,786 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:54:21,786 INFO L470 AbstractCegarLoop]: Abstraction has 123 states and 129 transitions. [2021-12-18 20:54:21,794 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-18 20:54:21,794 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 129 transitions. [2021-12-18 20:54:21,795 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2021-12-18 20:54:21,795 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:54:21,795 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1] [2021-12-18 20:54:21,804 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (2)] Ended with exit code 0 [2021-12-18 20:54:22,004 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-18 20:54:22,004 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 55 more)] === [2021-12-18 20:54:22,005 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:54:22,005 INFO L85 PathProgramCache]: Analyzing trace with hash 29858, now seen corresponding path program 1 times [2021-12-18 20:54:22,006 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-18 20:54:22,006 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1103779055] [2021-12-18 20:54:22,006 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:54:22,006 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-18 20:54:22,006 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-18 20:54:22,008 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-18 20:54:22,010 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-12-18 20:54:22,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:54:22,059 INFO L263 TraceCheckSpWp]: Trace formula consists of 23 conjuncts, 4 conjunts are in the unsatisfiable core [2021-12-18 20:54:22,060 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:54:22,075 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:54:22,087 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 20:54:22,088 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-18 20:54:22,088 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-18 20:54:22,088 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1103779055] [2021-12-18 20:54:22,093 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1103779055] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-18 20:54:22,094 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-18 20:54:22,095 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-18 20:54:22,095 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [84826261] [2021-12-18 20:54:22,095 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-18 20:54:22,096 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-18 20:54:22,096 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-18 20:54:22,097 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-18 20:54:22,097 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-18 20:54:22,097 INFO L87 Difference]: Start difference. First operand 123 states and 129 transitions. Second operand has 3 states, 2 states have (on average 1.5) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-18 20:54:22,336 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:54:22,336 INFO L93 Difference]: Finished difference Result 123 states and 130 transitions. [2021-12-18 20:54:22,337 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-18 20:54:22,338 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 3 states have internal predecessors, (3), 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 3 [2021-12-18 20:54:22,338 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:54:22,339 INFO L225 Difference]: With dead ends: 123 [2021-12-18 20:54:22,339 INFO L226 Difference]: Without dead ends: 123 [2021-12-18 20:54:22,339 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-18 20:54:22,340 INFO L933 BasicCegarLoop]: 121 mSDtfsCounter, 10 mSDsluCounter, 68 mSDsCounter, 0 mSdLazyCounter, 56 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 189 SdHoareTripleChecker+Invalid, 58 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 56 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-18 20:54:22,340 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 189 Invalid, 58 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 56 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-18 20:54:22,341 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2021-12-18 20:54:22,349 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 121. [2021-12-18 20:54:22,350 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 121 states, 63 states have (on average 1.9523809523809523) internal successors, (123), 117 states have internal predecessors, (123), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-18 20:54:22,353 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 127 transitions. [2021-12-18 20:54:22,353 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 127 transitions. Word has length 3 [2021-12-18 20:54:22,353 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:54:22,353 INFO L470 AbstractCegarLoop]: Abstraction has 121 states and 127 transitions. [2021-12-18 20:54:22,353 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-18 20:54:22,354 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 127 transitions. [2021-12-18 20:54:22,354 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-12-18 20:54:22,354 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:54:22,354 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-12-18 20:54:22,360 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (3)] Ended with exit code 0 [2021-12-18 20:54:22,554 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-18 20:54:22,555 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 55 more)] === [2021-12-18 20:54:22,555 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:54:22,556 INFO L85 PathProgramCache]: Analyzing trace with hash 889446152, now seen corresponding path program 1 times [2021-12-18 20:54:22,556 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-18 20:54:22,556 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1567523420] [2021-12-18 20:54:22,556 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:54:22,557 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-18 20:54:22,557 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-18 20:54:22,558 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-18 20:54:22,560 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-12-18 20:54:22,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:54:22,616 INFO L263 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 3 conjunts are in the unsatisfiable core [2021-12-18 20:54:22,617 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:54:22,640 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:54:22,649 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 20:54:22,650 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-18 20:54:22,650 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-18 20:54:22,650 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1567523420] [2021-12-18 20:54:22,652 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1567523420] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-18 20:54:22,653 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-18 20:54:22,653 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-18 20:54:22,653 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [497355827] [2021-12-18 20:54:22,653 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-18 20:54:22,654 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-18 20:54:22,654 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-18 20:54:22,655 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-18 20:54:22,655 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-18 20:54:22,656 INFO L87 Difference]: Start difference. First operand 121 states and 127 transitions. Second operand has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-18 20:54:22,858 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:54:22,858 INFO L93 Difference]: Finished difference Result 138 states and 146 transitions. [2021-12-18 20:54:22,861 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-18 20:54:22,861 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2021-12-18 20:54:22,861 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:54:22,862 INFO L225 Difference]: With dead ends: 138 [2021-12-18 20:54:22,862 INFO L226 Difference]: Without dead ends: 138 [2021-12-18 20:54:22,862 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-18 20:54:22,863 INFO L933 BasicCegarLoop]: 113 mSDtfsCounter, 27 mSDsluCounter, 60 mSDsCounter, 0 mSdLazyCounter, 67 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 173 SdHoareTripleChecker+Invalid, 70 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 67 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-18 20:54:22,863 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 173 Invalid, 70 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 67 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-18 20:54:22,864 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2021-12-18 20:54:22,874 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 124. [2021-12-18 20:54:22,874 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 68 states have (on average 1.8970588235294117) internal successors, (129), 120 states have internal predecessors, (129), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-18 20:54:22,876 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 133 transitions. [2021-12-18 20:54:22,879 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 133 transitions. Word has length 6 [2021-12-18 20:54:22,879 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:54:22,879 INFO L470 AbstractCegarLoop]: Abstraction has 124 states and 133 transitions. [2021-12-18 20:54:22,880 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-18 20:54:22,880 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 133 transitions. [2021-12-18 20:54:22,880 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-12-18 20:54:22,881 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:54:22,881 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-12-18 20:54:22,893 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-12-18 20:54:23,093 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-18 20:54:23,093 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 55 more)] === [2021-12-18 20:54:23,094 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:54:23,094 INFO L85 PathProgramCache]: Analyzing trace with hash 889446153, now seen corresponding path program 1 times [2021-12-18 20:54:23,094 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-18 20:54:23,095 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1068840078] [2021-12-18 20:54:23,095 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:54:23,095 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-18 20:54:23,095 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-18 20:54:23,096 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-18 20:54:23,098 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-12-18 20:54:23,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:54:23,160 INFO L263 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 4 conjunts are in the unsatisfiable core [2021-12-18 20:54:23,161 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:54:23,181 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:54:23,189 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 20:54:23,189 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-18 20:54:23,189 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-18 20:54:23,190 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1068840078] [2021-12-18 20:54:23,190 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1068840078] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-18 20:54:23,190 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-18 20:54:23,190 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-18 20:54:23,190 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [742256379] [2021-12-18 20:54:23,191 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-18 20:54:23,191 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-18 20:54:23,191 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-18 20:54:23,192 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-18 20:54:23,192 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-18 20:54:23,192 INFO L87 Difference]: Start difference. First operand 124 states and 133 transitions. Second operand has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-18 20:54:23,392 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:54:23,392 INFO L93 Difference]: Finished difference Result 124 states and 134 transitions. [2021-12-18 20:54:23,394 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-18 20:54:23,394 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2021-12-18 20:54:23,395 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:54:23,395 INFO L225 Difference]: With dead ends: 124 [2021-12-18 20:54:23,395 INFO L226 Difference]: Without dead ends: 124 [2021-12-18 20:54:23,396 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-18 20:54:23,396 INFO L933 BasicCegarLoop]: 122 mSDtfsCounter, 4 mSDsluCounter, 68 mSDsCounter, 0 mSdLazyCounter, 54 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 190 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 54 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-18 20:54:23,397 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4 Valid, 190 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 54 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-18 20:54:23,398 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2021-12-18 20:54:23,402 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 122. [2021-12-18 20:54:23,402 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 122 states, 68 states have (on average 1.8676470588235294) internal successors, (127), 118 states have internal predecessors, (127), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-18 20:54:23,403 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 131 transitions. [2021-12-18 20:54:23,403 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 131 transitions. Word has length 6 [2021-12-18 20:54:23,403 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:54:23,404 INFO L470 AbstractCegarLoop]: Abstraction has 122 states and 131 transitions. [2021-12-18 20:54:23,404 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-18 20:54:23,404 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 131 transitions. [2021-12-18 20:54:23,404 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-12-18 20:54:23,404 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:54:23,404 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 20:54:23,415 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2021-12-18 20:54:23,605 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-18 20:54:23,605 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting appendErr0REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 55 more)] === [2021-12-18 20:54:23,605 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:54:23,606 INFO L85 PathProgramCache]: Analyzing trace with hash 1036549323, now seen corresponding path program 1 times [2021-12-18 20:54:23,606 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-18 20:54:23,606 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [195026372] [2021-12-18 20:54:23,606 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:54:23,606 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-18 20:54:23,606 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-18 20:54:23,608 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-18 20:54:23,610 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-12-18 20:54:23,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:54:23,679 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 3 conjunts are in the unsatisfiable core [2021-12-18 20:54:23,680 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:54:23,714 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:54:23,723 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 20:54:23,724 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-18 20:54:23,724 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-18 20:54:23,724 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [195026372] [2021-12-18 20:54:23,724 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [195026372] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-18 20:54:23,724 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-18 20:54:23,724 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-18 20:54:23,725 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [333158883] [2021-12-18 20:54:23,725 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-18 20:54:23,725 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-18 20:54:23,725 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-18 20:54:23,726 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-18 20:54:23,726 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-18 20:54:23,726 INFO L87 Difference]: Start difference. First operand 122 states and 131 transitions. Second operand has 3 states, 2 states have (on average 5.5) internal successors, (11), 3 states have internal predecessors, (11), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-18 20:54:23,866 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:54:23,866 INFO L93 Difference]: Finished difference Result 117 states and 126 transitions. [2021-12-18 20:54:23,867 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-18 20:54:23,867 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 5.5) internal successors, (11), 3 states have internal predecessors, (11), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2021-12-18 20:54:23,867 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:54:23,868 INFO L225 Difference]: With dead ends: 117 [2021-12-18 20:54:23,868 INFO L226 Difference]: Without dead ends: 117 [2021-12-18 20:54:23,868 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-18 20:54:23,869 INFO L933 BasicCegarLoop]: 92 mSDtfsCounter, 43 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 56 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 136 SdHoareTripleChecker+Invalid, 60 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 56 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-18 20:54:23,869 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [43 Valid, 136 Invalid, 60 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 56 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-18 20:54:23,870 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2021-12-18 20:54:23,874 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 117. [2021-12-18 20:54:23,874 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 117 states, 68 states have (on average 1.7941176470588236) internal successors, (122), 113 states have internal predecessors, (122), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-18 20:54:23,875 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 126 transitions. [2021-12-18 20:54:23,875 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 126 transitions. Word has length 12 [2021-12-18 20:54:23,875 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:54:23,875 INFO L470 AbstractCegarLoop]: Abstraction has 117 states and 126 transitions. [2021-12-18 20:54:23,876 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 5.5) internal successors, (11), 3 states have internal predecessors, (11), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-18 20:54:23,876 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 126 transitions. [2021-12-18 20:54:23,876 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-12-18 20:54:23,876 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:54:23,876 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 20:54:23,886 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2021-12-18 20:54:24,076 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-18 20:54:24,077 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting appendErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 55 more)] === [2021-12-18 20:54:24,077 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:54:24,077 INFO L85 PathProgramCache]: Analyzing trace with hash 1036549324, now seen corresponding path program 1 times [2021-12-18 20:54:24,078 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-18 20:54:24,078 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1088787265] [2021-12-18 20:54:24,078 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:54:24,078 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-18 20:54:24,078 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-18 20:54:24,079 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-18 20:54:24,080 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2021-12-18 20:54:24,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:54:24,155 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 4 conjunts are in the unsatisfiable core [2021-12-18 20:54:24,157 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:54:24,199 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:54:24,207 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 20:54:24,208 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-18 20:54:24,208 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-18 20:54:24,208 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1088787265] [2021-12-18 20:54:24,208 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1088787265] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-18 20:54:24,208 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-18 20:54:24,208 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-18 20:54:24,209 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1387301738] [2021-12-18 20:54:24,209 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-18 20:54:24,209 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-18 20:54:24,209 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-18 20:54:24,210 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-18 20:54:24,210 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-18 20:54:24,210 INFO L87 Difference]: Start difference. First operand 117 states and 126 transitions. Second operand has 3 states, 2 states have (on average 5.5) internal successors, (11), 3 states have internal predecessors, (11), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-18 20:54:24,374 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:54:24,374 INFO L93 Difference]: Finished difference Result 112 states and 121 transitions. [2021-12-18 20:54:24,374 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-18 20:54:24,375 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 5.5) internal successors, (11), 3 states have internal predecessors, (11), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2021-12-18 20:54:24,375 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:54:24,375 INFO L225 Difference]: With dead ends: 112 [2021-12-18 20:54:24,375 INFO L226 Difference]: Without dead ends: 112 [2021-12-18 20:54:24,375 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-18 20:54:24,377 INFO L933 BasicCegarLoop]: 92 mSDtfsCounter, 38 mSDsluCounter, 53 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 145 SdHoareTripleChecker+Invalid, 46 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-18 20:54:24,377 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [38 Valid, 145 Invalid, 46 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 42 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-18 20:54:24,377 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2021-12-18 20:54:24,381 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 112. [2021-12-18 20:54:24,382 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 112 states, 68 states have (on average 1.7205882352941178) internal successors, (117), 108 states have internal predecessors, (117), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-18 20:54:24,383 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 121 transitions. [2021-12-18 20:54:24,383 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 121 transitions. Word has length 12 [2021-12-18 20:54:24,383 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:54:24,383 INFO L470 AbstractCegarLoop]: Abstraction has 112 states and 121 transitions. [2021-12-18 20:54:24,384 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 5.5) internal successors, (11), 3 states have internal predecessors, (11), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-18 20:54:24,384 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 121 transitions. [2021-12-18 20:54:24,384 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-12-18 20:54:24,384 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:54:24,384 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 20:54:24,393 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (7)] Forceful destruction successful, exit code 0 [2021-12-18 20:54:24,591 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-18 20:54:24,592 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting appendErr2REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 55 more)] === [2021-12-18 20:54:24,592 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:54:24,592 INFO L85 PathProgramCache]: Analyzing trace with hash 2068258039, now seen corresponding path program 1 times [2021-12-18 20:54:24,592 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-18 20:54:24,592 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1757063165] [2021-12-18 20:54:24,592 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:54:24,593 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-18 20:54:24,593 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-18 20:54:24,594 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-18 20:54:24,596 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2021-12-18 20:54:24,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:54:24,695 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 11 conjunts are in the unsatisfiable core [2021-12-18 20:54:24,697 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:54:24,719 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:54:24,770 INFO L354 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2021-12-18 20:54:24,770 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 27 [2021-12-18 20:54:24,831 INFO L354 Elim1Store]: treesize reduction 12, result has 40.0 percent of original size [2021-12-18 20:54:24,832 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 15 treesize of output 20 [2021-12-18 20:54:24,855 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 20:54:24,855 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-18 20:54:24,855 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-18 20:54:24,855 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1757063165] [2021-12-18 20:54:24,855 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1757063165] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-18 20:54:24,855 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-18 20:54:24,855 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-12-18 20:54:24,856 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1356236204] [2021-12-18 20:54:24,856 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-18 20:54:24,856 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-12-18 20:54:24,856 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-18 20:54:24,856 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-12-18 20:54:24,857 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-12-18 20:54:24,857 INFO L87 Difference]: Start difference. First operand 112 states and 121 transitions. Second operand has 5 states, 4 states have (on average 3.0) internal successors, (12), 4 states have internal predecessors, (12), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-18 20:54:25,212 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:54:25,213 INFO L93 Difference]: Finished difference Result 177 states and 191 transitions. [2021-12-18 20:54:25,213 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-18 20:54:25,213 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 3.0) internal successors, (12), 4 states have internal predecessors, (12), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2021-12-18 20:54:25,214 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:54:25,214 INFO L225 Difference]: With dead ends: 177 [2021-12-18 20:54:25,214 INFO L226 Difference]: Without dead ends: 177 [2021-12-18 20:54:25,215 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-12-18 20:54:25,215 INFO L933 BasicCegarLoop]: 63 mSDtfsCounter, 136 mSDsluCounter, 134 mSDsCounter, 0 mSdLazyCounter, 187 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 136 SdHoareTripleChecker+Valid, 197 SdHoareTripleChecker+Invalid, 204 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 187 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-18 20:54:25,216 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [136 Valid, 197 Invalid, 204 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 187 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-12-18 20:54:25,216 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 177 states. [2021-12-18 20:54:25,220 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 177 to 130. [2021-12-18 20:54:25,220 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 130 states, 91 states have (on average 1.6153846153846154) internal successors, (147), 125 states have internal predecessors, (147), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-18 20:54:25,221 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 151 transitions. [2021-12-18 20:54:25,221 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 151 transitions. Word has length 13 [2021-12-18 20:54:25,221 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:54:25,221 INFO L470 AbstractCegarLoop]: Abstraction has 130 states and 151 transitions. [2021-12-18 20:54:25,222 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 3.0) internal successors, (12), 4 states have internal predecessors, (12), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-18 20:54:25,222 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 151 transitions. [2021-12-18 20:54:25,222 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-12-18 20:54:25,222 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:54:25,222 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 20:54:25,231 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (8)] Ended with exit code 0 [2021-12-18 20:54:25,431 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-18 20:54:25,432 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting appendErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 55 more)] === [2021-12-18 20:54:25,432 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:54:25,432 INFO L85 PathProgramCache]: Analyzing trace with hash 2068258040, now seen corresponding path program 1 times [2021-12-18 20:54:25,433 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-18 20:54:25,433 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [217837432] [2021-12-18 20:54:25,433 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:54:25,433 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-18 20:54:25,433 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-18 20:54:25,434 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-18 20:54:25,435 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2021-12-18 20:54:25,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:54:25,536 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 16 conjunts are in the unsatisfiable core [2021-12-18 20:54:25,537 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:54:25,557 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:54:25,565 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:54:25,617 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:54:25,618 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-18 20:54:25,627 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-18 20:54:25,628 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 14 treesize of output 14 [2021-12-18 20:54:25,705 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-18 20:54:25,706 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 12 treesize of output 18 [2021-12-18 20:54:25,778 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 20:54:25,778 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-18 20:54:25,778 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-18 20:54:25,778 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [217837432] [2021-12-18 20:54:25,779 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [217837432] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-18 20:54:25,779 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-18 20:54:25,779 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-12-18 20:54:25,779 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1119648818] [2021-12-18 20:54:25,779 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-18 20:54:25,780 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-12-18 20:54:25,780 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-18 20:54:25,780 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-12-18 20:54:25,780 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-12-18 20:54:25,781 INFO L87 Difference]: Start difference. First operand 130 states and 151 transitions. Second operand has 6 states, 5 states have (on average 2.4) internal successors, (12), 5 states have internal predecessors, (12), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-18 20:54:26,011 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:54:26,011 INFO L93 Difference]: Finished difference Result 135 states and 157 transitions. [2021-12-18 20:54:26,012 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-12-18 20:54:26,012 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 2.4) internal successors, (12), 5 states have internal predecessors, (12), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2021-12-18 20:54:26,012 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:54:26,013 INFO L225 Difference]: With dead ends: 135 [2021-12-18 20:54:26,013 INFO L226 Difference]: Without dead ends: 135 [2021-12-18 20:54:26,013 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-12-18 20:54:26,014 INFO L933 BasicCegarLoop]: 100 mSDtfsCounter, 6 mSDsluCounter, 187 mSDsCounter, 0 mSdLazyCounter, 89 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 287 SdHoareTripleChecker+Invalid, 134 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 89 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 43 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-18 20:54:26,014 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 287 Invalid, 134 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 89 Invalid, 0 Unknown, 43 Unchecked, 0.2s Time] [2021-12-18 20:54:26,014 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2021-12-18 20:54:26,018 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 135. [2021-12-18 20:54:26,018 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 135 states, 95 states have (on average 1.5894736842105264) internal successors, (151), 129 states have internal predecessors, (151), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-12-18 20:54:26,019 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 157 transitions. [2021-12-18 20:54:26,019 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 157 transitions. Word has length 13 [2021-12-18 20:54:26,020 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:54:26,020 INFO L470 AbstractCegarLoop]: Abstraction has 135 states and 157 transitions. [2021-12-18 20:54:26,020 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 2.4) internal successors, (12), 5 states have internal predecessors, (12), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-18 20:54:26,020 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 157 transitions. [2021-12-18 20:54:26,020 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-12-18 20:54:26,020 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:54:26,021 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 20:54:26,035 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (9)] Forceful destruction successful, exit code 0 [2021-12-18 20:54:26,230 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-18 20:54:26,230 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting appendErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 55 more)] === [2021-12-18 20:54:26,231 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:54:26,231 INFO L85 PathProgramCache]: Analyzing trace with hash -125488176, now seen corresponding path program 1 times [2021-12-18 20:54:26,231 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-18 20:54:26,231 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1703387255] [2021-12-18 20:54:26,231 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:54:26,232 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-18 20:54:26,232 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-18 20:54:26,232 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-18 20:54:26,233 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (10)] Waiting until timeout for monitored process [2021-12-18 20:54:26,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:54:26,345 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 16 conjunts are in the unsatisfiable core [2021-12-18 20:54:26,347 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:54:26,361 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:54:26,367 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:54:26,409 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:54:26,410 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-18 20:54:26,425 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-18 20:54:26,425 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 14 treesize of output 14 [2021-12-18 20:54:26,502 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-18 20:54:26,503 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 12 treesize of output 18 [2021-12-18 20:54:26,649 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 20:54:26,649 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-18 20:54:26,650 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-18 20:54:26,650 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1703387255] [2021-12-18 20:54:26,650 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1703387255] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-18 20:54:26,650 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-18 20:54:26,650 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-12-18 20:54:26,650 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [72281381] [2021-12-18 20:54:26,650 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-18 20:54:26,651 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-12-18 20:54:26,651 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-18 20:54:26,651 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-12-18 20:54:26,651 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-12-18 20:54:26,652 INFO L87 Difference]: Start difference. First operand 135 states and 157 transitions. Second operand has 6 states, 5 states have (on average 3.0) internal successors, (15), 5 states have internal predecessors, (15), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-18 20:54:26,854 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:54:26,855 INFO L93 Difference]: Finished difference Result 141 states and 167 transitions. [2021-12-18 20:54:26,855 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-12-18 20:54:26,855 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 3.0) internal successors, (15), 5 states have internal predecessors, (15), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2021-12-18 20:54:26,855 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:54:26,856 INFO L225 Difference]: With dead ends: 141 [2021-12-18 20:54:26,856 INFO L226 Difference]: Without dead ends: 141 [2021-12-18 20:54:26,856 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-12-18 20:54:26,857 INFO L933 BasicCegarLoop]: 95 mSDtfsCounter, 9 mSDsluCounter, 188 mSDsCounter, 0 mSdLazyCounter, 79 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 283 SdHoareTripleChecker+Invalid, 124 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 79 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 43 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-18 20:54:26,857 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 283 Invalid, 124 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 79 Invalid, 0 Unknown, 43 Unchecked, 0.2s Time] [2021-12-18 20:54:26,858 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2021-12-18 20:54:26,860 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 138. [2021-12-18 20:54:26,861 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 138 states, 98 states have (on average 1.5816326530612246) internal successors, (155), 132 states have internal predecessors, (155), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-12-18 20:54:26,861 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 161 transitions. [2021-12-18 20:54:26,861 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 161 transitions. Word has length 16 [2021-12-18 20:54:26,862 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:54:26,862 INFO L470 AbstractCegarLoop]: Abstraction has 138 states and 161 transitions. [2021-12-18 20:54:26,862 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 3.0) internal successors, (15), 5 states have internal predecessors, (15), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-18 20:54:26,862 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 161 transitions. [2021-12-18 20:54:26,862 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-12-18 20:54:26,862 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:54:26,862 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 20:54:26,873 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (10)] Forceful destruction successful, exit code 0 [2021-12-18 20:54:27,063 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-18 20:54:27,063 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting appendErr7REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 55 more)] === [2021-12-18 20:54:27,063 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:54:27,063 INFO L85 PathProgramCache]: Analyzing trace with hash 404839970, now seen corresponding path program 1 times [2021-12-18 20:54:27,064 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-18 20:54:27,064 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [452295283] [2021-12-18 20:54:27,064 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:54:27,064 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-18 20:54:27,064 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-18 20:54:27,065 INFO L229 MonitoredProcess]: Starting monitored process 11 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-18 20:54:27,068 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (11)] Waiting until timeout for monitored process [2021-12-18 20:54:27,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:54:27,147 INFO L263 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 2 conjunts are in the unsatisfiable core [2021-12-18 20:54:27,148 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:54:27,175 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 20:54:27,175 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-18 20:54:27,175 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-18 20:54:27,175 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [452295283] [2021-12-18 20:54:27,175 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [452295283] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-18 20:54:27,175 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-18 20:54:27,176 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-12-18 20:54:27,176 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [982888627] [2021-12-18 20:54:27,176 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-18 20:54:27,176 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-18 20:54:27,176 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-18 20:54:27,177 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-18 20:54:27,177 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-18 20:54:27,177 INFO L87 Difference]: Start difference. First operand 138 states and 161 transitions. Second operand has 3 states, 3 states have (on average 5.333333333333333) internal successors, (16), 3 states have internal predecessors, (16), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-18 20:54:27,183 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:54:27,184 INFO L93 Difference]: Finished difference Result 140 states and 163 transitions. [2021-12-18 20:54:27,184 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-18 20:54:27,184 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 5.333333333333333) internal successors, (16), 3 states have internal predecessors, (16), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 17 [2021-12-18 20:54:27,184 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:54:27,185 INFO L225 Difference]: With dead ends: 140 [2021-12-18 20:54:27,185 INFO L226 Difference]: Without dead ends: 140 [2021-12-18 20:54:27,185 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-18 20:54:27,186 INFO L933 BasicCegarLoop]: 106 mSDtfsCounter, 0 mSDsluCounter, 101 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 207 SdHoareTripleChecker+Invalid, 6 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 6 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-18 20:54:27,186 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 207 Invalid, 6 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-18 20:54:27,187 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2021-12-18 20:54:27,189 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 140. [2021-12-18 20:54:27,189 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 140 states, 100 states have (on average 1.57) internal successors, (157), 134 states have internal predecessors, (157), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-12-18 20:54:27,190 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 163 transitions. [2021-12-18 20:54:27,190 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 163 transitions. Word has length 17 [2021-12-18 20:54:27,190 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:54:27,190 INFO L470 AbstractCegarLoop]: Abstraction has 140 states and 163 transitions. [2021-12-18 20:54:27,191 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 5.333333333333333) internal successors, (16), 3 states have internal predecessors, (16), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-18 20:54:27,191 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 163 transitions. [2021-12-18 20:54:27,191 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-12-18 20:54:27,191 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:54:27,191 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 20:54:27,207 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (11)] Forceful destruction successful, exit code 0 [2021-12-18 20:54:27,401 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-18 20:54:27,401 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting appendErr15REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 55 more)] === [2021-12-18 20:54:27,401 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:54:27,401 INFO L85 PathProgramCache]: Analyzing trace with hash 404840386, now seen corresponding path program 1 times [2021-12-18 20:54:27,402 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-18 20:54:27,402 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [489454785] [2021-12-18 20:54:27,402 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:54:27,402 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-18 20:54:27,402 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-18 20:54:27,403 INFO L229 MonitoredProcess]: Starting monitored process 12 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-18 20:54:27,404 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (12)] Waiting until timeout for monitored process [2021-12-18 20:54:27,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:54:27,500 INFO L263 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 16 conjunts are in the unsatisfiable core [2021-12-18 20:54:27,502 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:54:27,512 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:54:27,516 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:54:27,551 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:54:27,551 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-18 20:54:27,559 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-18 20:54:27,559 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 14 treesize of output 14 [2021-12-18 20:54:27,621 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-18 20:54:27,621 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 12 treesize of output 18 [2021-12-18 20:54:27,753 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 20:54:27,753 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-18 20:54:27,754 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-18 20:54:27,754 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [489454785] [2021-12-18 20:54:27,754 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [489454785] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-18 20:54:27,754 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-18 20:54:27,754 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-12-18 20:54:27,754 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [478159332] [2021-12-18 20:54:27,754 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-18 20:54:27,755 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-12-18 20:54:27,755 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-18 20:54:27,755 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-12-18 20:54:27,755 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-12-18 20:54:27,756 INFO L87 Difference]: Start difference. First operand 140 states and 163 transitions. Second operand has 6 states, 5 states have (on average 3.2) internal successors, (16), 5 states have internal predecessors, (16), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-18 20:54:28,019 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:54:28,020 INFO L93 Difference]: Finished difference Result 142 states and 165 transitions. [2021-12-18 20:54:28,020 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-12-18 20:54:28,020 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 3.2) internal successors, (16), 5 states have internal predecessors, (16), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 17 [2021-12-18 20:54:28,020 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:54:28,021 INFO L225 Difference]: With dead ends: 142 [2021-12-18 20:54:28,021 INFO L226 Difference]: Without dead ends: 142 [2021-12-18 20:54:28,021 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-12-18 20:54:28,022 INFO L933 BasicCegarLoop]: 98 mSDtfsCounter, 7 mSDsluCounter, 231 mSDsCounter, 0 mSdLazyCounter, 139 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 329 SdHoareTripleChecker+Invalid, 184 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 139 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 43 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-18 20:54:28,022 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 329 Invalid, 184 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 139 Invalid, 0 Unknown, 43 Unchecked, 0.3s Time] [2021-12-18 20:54:28,023 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2021-12-18 20:54:28,025 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 142. [2021-12-18 20:54:28,026 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 142 states, 102 states have (on average 1.5588235294117647) internal successors, (159), 136 states have internal predecessors, (159), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-12-18 20:54:28,026 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 165 transitions. [2021-12-18 20:54:28,026 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 165 transitions. Word has length 17 [2021-12-18 20:54:28,026 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:54:28,027 INFO L470 AbstractCegarLoop]: Abstraction has 142 states and 165 transitions. [2021-12-18 20:54:28,027 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 3.2) internal successors, (16), 5 states have internal predecessors, (16), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-18 20:54:28,027 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 165 transitions. [2021-12-18 20:54:28,027 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-12-18 20:54:28,027 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:54:28,027 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 20:54:28,038 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (12)] Forceful destruction successful, exit code 0 [2021-12-18 20:54:28,228 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-18 20:54:28,228 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting appendErr7REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 55 more)] === [2021-12-18 20:54:28,228 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:54:28,228 INFO L85 PathProgramCache]: Analyzing trace with hash -1796626049, now seen corresponding path program 1 times [2021-12-18 20:54:28,228 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-18 20:54:28,229 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1824817579] [2021-12-18 20:54:28,229 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:54:28,229 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-18 20:54:28,229 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-18 20:54:28,230 INFO L229 MonitoredProcess]: Starting monitored process 13 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-18 20:54:28,230 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (13)] Waiting until timeout for monitored process [2021-12-18 20:54:28,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:54:28,307 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 5 conjunts are in the unsatisfiable core [2021-12-18 20:54:28,308 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:54:28,394 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 20:54:28,394 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-18 20:54:28,394 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-18 20:54:28,394 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1824817579] [2021-12-18 20:54:28,394 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1824817579] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-18 20:54:28,394 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-18 20:54:28,394 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-12-18 20:54:28,394 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1508958362] [2021-12-18 20:54:28,395 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-18 20:54:28,395 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-12-18 20:54:28,395 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-18 20:54:28,395 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-12-18 20:54:28,395 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-12-18 20:54:28,395 INFO L87 Difference]: Start difference. First operand 142 states and 165 transitions. Second operand has 6 states, 5 states have (on average 3.6) internal successors, (18), 5 states have internal predecessors, (18), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-18 20:54:28,598 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:54:28,598 INFO L93 Difference]: Finished difference Result 149 states and 163 transitions. [2021-12-18 20:54:28,599 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-18 20:54:28,599 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 3.6) internal successors, (18), 5 states have internal predecessors, (18), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2021-12-18 20:54:28,600 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:54:28,600 INFO L225 Difference]: With dead ends: 149 [2021-12-18 20:54:28,600 INFO L226 Difference]: Without dead ends: 149 [2021-12-18 20:54:28,601 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2021-12-18 20:54:28,601 INFO L933 BasicCegarLoop]: 80 mSDtfsCounter, 142 mSDsluCounter, 198 mSDsCounter, 0 mSdLazyCounter, 78 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 144 SdHoareTripleChecker+Valid, 278 SdHoareTripleChecker+Invalid, 79 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 78 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-18 20:54:28,601 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [144 Valid, 278 Invalid, 79 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 78 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-18 20:54:28,602 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2021-12-18 20:54:28,604 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 141. [2021-12-18 20:54:28,604 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 141 states, 102 states have (on average 1.5392156862745099) internal successors, (157), 135 states have internal predecessors, (157), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-12-18 20:54:28,605 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 163 transitions. [2021-12-18 20:54:28,605 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 163 transitions. Word has length 19 [2021-12-18 20:54:28,605 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:54:28,605 INFO L470 AbstractCegarLoop]: Abstraction has 141 states and 163 transitions. [2021-12-18 20:54:28,605 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 3.6) internal successors, (18), 5 states have internal predecessors, (18), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-18 20:54:28,605 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 163 transitions. [2021-12-18 20:54:28,606 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-12-18 20:54:28,606 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:54:28,606 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 20:54:28,617 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (13)] Forceful destruction successful, exit code 0 [2021-12-18 20:54:28,816 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-18 20:54:28,816 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting appendErr15REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 55 more)] === [2021-12-18 20:54:28,816 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:54:28,816 INFO L85 PathProgramCache]: Analyzing trace with hash -1796625633, now seen corresponding path program 1 times [2021-12-18 20:54:28,816 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-18 20:54:28,820 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [782068672] [2021-12-18 20:54:28,820 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:54:28,820 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-18 20:54:28,820 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-18 20:54:28,821 INFO L229 MonitoredProcess]: Starting monitored process 14 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-18 20:54:28,822 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (14)] Waiting until timeout for monitored process [2021-12-18 20:54:28,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:54:28,897 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 5 conjunts are in the unsatisfiable core [2021-12-18 20:54:28,898 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:54:28,963 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 20:54:28,964 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-18 20:54:28,964 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-18 20:54:28,964 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [782068672] [2021-12-18 20:54:28,964 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [782068672] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-18 20:54:28,964 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-18 20:54:28,964 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-12-18 20:54:28,964 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [834244351] [2021-12-18 20:54:28,965 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-18 20:54:28,965 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-12-18 20:54:28,965 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-18 20:54:28,965 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-12-18 20:54:28,966 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-12-18 20:54:28,966 INFO L87 Difference]: Start difference. First operand 141 states and 163 transitions. Second operand has 6 states, 5 states have (on average 3.6) internal successors, (18), 5 states have internal predecessors, (18), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-18 20:54:29,276 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:54:29,276 INFO L93 Difference]: Finished difference Result 147 states and 161 transitions. [2021-12-18 20:54:29,277 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-18 20:54:29,277 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 3.6) internal successors, (18), 5 states have internal predecessors, (18), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2021-12-18 20:54:29,277 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:54:29,278 INFO L225 Difference]: With dead ends: 147 [2021-12-18 20:54:29,278 INFO L226 Difference]: Without dead ends: 147 [2021-12-18 20:54:29,278 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2021-12-18 20:54:29,279 INFO L933 BasicCegarLoop]: 84 mSDtfsCounter, 110 mSDsluCounter, 264 mSDsCounter, 0 mSdLazyCounter, 115 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 112 SdHoareTripleChecker+Valid, 348 SdHoareTripleChecker+Invalid, 119 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 115 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-18 20:54:29,279 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [112 Valid, 348 Invalid, 119 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 115 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-12-18 20:54:29,280 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 147 states. [2021-12-18 20:54:29,282 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 147 to 141. [2021-12-18 20:54:29,283 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 141 states, 102 states have (on average 1.5098039215686274) internal successors, (154), 135 states have internal predecessors, (154), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-12-18 20:54:29,283 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 160 transitions. [2021-12-18 20:54:29,283 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 160 transitions. Word has length 19 [2021-12-18 20:54:29,284 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:54:29,284 INFO L470 AbstractCegarLoop]: Abstraction has 141 states and 160 transitions. [2021-12-18 20:54:29,284 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 3.6) internal successors, (18), 5 states have internal predecessors, (18), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-18 20:54:29,284 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 160 transitions. [2021-12-18 20:54:29,284 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-12-18 20:54:29,285 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:54:29,285 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 20:54:29,294 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (14)] Forceful destruction successful, exit code 0 [2021-12-18 20:54:29,494 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-18 20:54:29,494 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting appendErr22REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 55 more)] === [2021-12-18 20:54:29,495 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:54:29,495 INFO L85 PathProgramCache]: Analyzing trace with hash 1101942182, now seen corresponding path program 1 times [2021-12-18 20:54:29,495 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-18 20:54:29,495 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [782498187] [2021-12-18 20:54:29,495 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:54:29,495 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-18 20:54:29,495 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-18 20:54:29,496 INFO L229 MonitoredProcess]: Starting monitored process 15 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-18 20:54:29,499 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (15)] Waiting until timeout for monitored process [2021-12-18 20:54:29,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:54:29,652 INFO L263 TraceCheckSpWp]: Trace formula consists of 170 conjuncts, 36 conjunts are in the unsatisfiable core [2021-12-18 20:54:29,655 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:54:29,665 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:54:29,674 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-12-18 20:54:29,679 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-12-18 20:54:29,717 INFO L354 Elim1Store]: treesize reduction 21, result has 25.0 percent of original size [2021-12-18 20:54:29,718 INFO L388 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 [2021-12-18 20:54:29,724 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:54:29,725 INFO L388 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 [2021-12-18 20:54:29,754 INFO L354 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2021-12-18 20:54:29,755 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 27 [2021-12-18 20:54:29,796 INFO L388 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 [2021-12-18 20:54:29,803 INFO L388 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 [2021-12-18 20:54:29,823 INFO L388 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 [2021-12-18 20:54:29,828 INFO L388 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 [2021-12-18 20:54:29,962 INFO L354 Elim1Store]: treesize reduction 8, result has 52.9 percent of original size [2021-12-18 20:54:29,963 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 2 case distinctions, treesize of input 23 treesize of output 25 [2021-12-18 20:54:30,002 INFO L388 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 [2021-12-18 20:54:30,006 INFO L388 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 [2021-12-18 20:54:30,030 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-12-18 20:54:30,034 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-12-18 20:54:30,071 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 20:54:30,071 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-18 20:54:30,071 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-18 20:54:30,071 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [782498187] [2021-12-18 20:54:30,072 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [782498187] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-18 20:54:30,072 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-18 20:54:30,072 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2021-12-18 20:54:30,072 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [219248160] [2021-12-18 20:54:30,072 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-18 20:54:30,072 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-12-18 20:54:30,072 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-18 20:54:30,073 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-12-18 20:54:30,073 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2021-12-18 20:54:30,073 INFO L87 Difference]: Start difference. First operand 141 states and 160 transitions. Second operand has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 10 states have internal predecessors, (21), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-18 20:54:30,572 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:54:30,573 INFO L93 Difference]: Finished difference Result 187 states and 208 transitions. [2021-12-18 20:54:30,573 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-12-18 20:54:30,573 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 10 states have internal predecessors, (21), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-12-18 20:54:30,573 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:54:30,574 INFO L225 Difference]: With dead ends: 187 [2021-12-18 20:54:30,574 INFO L226 Difference]: Without dead ends: 187 [2021-12-18 20:54:30,574 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=38, Invalid=118, Unknown=0, NotChecked=0, Total=156 [2021-12-18 20:54:30,575 INFO L933 BasicCegarLoop]: 75 mSDtfsCounter, 63 mSDsluCounter, 462 mSDsCounter, 0 mSdLazyCounter, 287 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 63 SdHoareTripleChecker+Valid, 537 SdHoareTripleChecker+Invalid, 373 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 287 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 75 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-12-18 20:54:30,575 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [63 Valid, 537 Invalid, 373 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 287 Invalid, 0 Unknown, 75 Unchecked, 0.5s Time] [2021-12-18 20:54:30,575 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2021-12-18 20:54:30,578 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 140. [2021-12-18 20:54:30,578 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 140 states, 101 states have (on average 1.504950495049505) internal successors, (152), 134 states have internal predecessors, (152), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-12-18 20:54:30,578 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 158 transitions. [2021-12-18 20:54:30,579 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 158 transitions. Word has length 22 [2021-12-18 20:54:30,579 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:54:30,579 INFO L470 AbstractCegarLoop]: Abstraction has 140 states and 158 transitions. [2021-12-18 20:54:30,579 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 10 states have internal predecessors, (21), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-18 20:54:30,579 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 158 transitions. [2021-12-18 20:54:30,580 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-12-18 20:54:30,580 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:54:30,580 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 20:54:30,589 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (15)] Forceful destruction successful, exit code 0 [2021-12-18 20:54:30,783 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-18 20:54:30,783 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting appendErr22REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 55 more)] === [2021-12-18 20:54:30,784 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:54:30,784 INFO L85 PathProgramCache]: Analyzing trace with hash 470783081, now seen corresponding path program 1 times [2021-12-18 20:54:30,784 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-18 20:54:30,784 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1240585588] [2021-12-18 20:54:30,784 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:54:30,784 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-18 20:54:30,784 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-18 20:54:30,785 INFO L229 MonitoredProcess]: Starting monitored process 16 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-18 20:54:30,786 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (16)] Waiting until timeout for monitored process [2021-12-18 20:54:30,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:54:30,933 INFO L263 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 31 conjunts are in the unsatisfiable core [2021-12-18 20:54:30,936 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:54:30,943 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:54:30,958 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-12-18 20:54:30,965 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-12-18 20:54:31,020 INFO L354 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2021-12-18 20:54:31,020 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 27 [2021-12-18 20:54:31,056 INFO L388 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 16 treesize of output 18 [2021-12-18 20:54:31,065 INFO L388 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 16 treesize of output 18 [2021-12-18 20:54:31,082 INFO L388 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 16 treesize of output 18 [2021-12-18 20:54:31,088 INFO L388 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 16 treesize of output 18 [2021-12-18 20:54:31,163 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-18 20:54:31,163 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 14 treesize of output 14 [2021-12-18 20:54:31,205 INFO L388 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 16 treesize of output 18 [2021-12-18 20:54:31,209 INFO L388 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 16 treesize of output 18 [2021-12-18 20:54:31,256 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 7 [2021-12-18 20:54:31,258 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 7 [2021-12-18 20:54:31,296 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 20:54:31,296 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-18 20:54:31,296 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-18 20:54:31,297 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1240585588] [2021-12-18 20:54:31,297 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1240585588] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-18 20:54:31,297 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-18 20:54:31,297 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2021-12-18 20:54:31,297 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [427732018] [2021-12-18 20:54:31,297 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-18 20:54:31,297 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-12-18 20:54:31,297 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-18 20:54:31,297 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-12-18 20:54:31,298 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2021-12-18 20:54:31,298 INFO L87 Difference]: Start difference. First operand 140 states and 158 transitions. Second operand has 10 states, 10 states have (on average 2.3) internal successors, (23), 9 states have internal predecessors, (23), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-18 20:54:31,880 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:54:31,880 INFO L93 Difference]: Finished difference Result 180 states and 200 transitions. [2021-12-18 20:54:31,881 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-12-18 20:54:31,881 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.3) internal successors, (23), 9 states have internal predecessors, (23), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-12-18 20:54:31,881 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:54:31,882 INFO L225 Difference]: With dead ends: 180 [2021-12-18 20:54:31,882 INFO L226 Difference]: Without dead ends: 180 [2021-12-18 20:54:31,882 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=38, Invalid=118, Unknown=0, NotChecked=0, Total=156 [2021-12-18 20:54:31,883 INFO L933 BasicCegarLoop]: 79 mSDtfsCounter, 51 mSDsluCounter, 405 mSDsCounter, 0 mSdLazyCounter, 288 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 484 SdHoareTripleChecker+Invalid, 306 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 288 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-12-18 20:54:31,883 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [51 Valid, 484 Invalid, 306 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 288 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-12-18 20:54:31,883 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180 states. [2021-12-18 20:54:31,886 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180 to 142. [2021-12-18 20:54:31,886 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 142 states, 103 states have (on average 1.4951456310679612) internal successors, (154), 136 states have internal predecessors, (154), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-12-18 20:54:31,887 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 160 transitions. [2021-12-18 20:54:31,887 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 160 transitions. Word has length 24 [2021-12-18 20:54:31,887 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:54:31,887 INFO L470 AbstractCegarLoop]: Abstraction has 142 states and 160 transitions. [2021-12-18 20:54:31,887 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.3) internal successors, (23), 9 states have internal predecessors, (23), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-18 20:54:31,887 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 160 transitions. [2021-12-18 20:54:31,888 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-12-18 20:54:31,888 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:54:31,888 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 20:54:31,902 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (16)] Forceful destruction successful, exit code 0 [2021-12-18 20:54:32,088 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-18 20:54:32,088 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 55 more)] === [2021-12-18 20:54:32,089 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:54:32,089 INFO L85 PathProgramCache]: Analyzing trace with hash -1370163219, now seen corresponding path program 1 times [2021-12-18 20:54:32,089 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-18 20:54:32,089 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [250695800] [2021-12-18 20:54:32,089 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:54:32,089 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-18 20:54:32,089 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-18 20:54:32,090 INFO L229 MonitoredProcess]: Starting monitored process 17 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-18 20:54:32,091 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (17)] Waiting until timeout for monitored process [2021-12-18 20:54:32,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:54:32,196 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 2 conjunts are in the unsatisfiable core [2021-12-18 20:54:32,197 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:54:32,241 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 20:54:32,241 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-18 20:54:32,241 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-18 20:54:32,241 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [250695800] [2021-12-18 20:54:32,242 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [250695800] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-18 20:54:32,242 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-18 20:54:32,242 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-12-18 20:54:32,242 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [612077799] [2021-12-18 20:54:32,242 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-18 20:54:32,242 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-18 20:54:32,243 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-18 20:54:32,243 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-18 20:54:32,243 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-18 20:54:32,243 INFO L87 Difference]: Start difference. First operand 142 states and 160 transitions. Second operand has 3 states, 3 states have (on average 8.666666666666666) internal successors, (26), 3 states have internal predecessors, (26), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-18 20:54:32,258 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:54:32,258 INFO L93 Difference]: Finished difference Result 150 states and 164 transitions. [2021-12-18 20:54:32,259 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-18 20:54:32,259 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 8.666666666666666) internal successors, (26), 3 states have internal predecessors, (26), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 28 [2021-12-18 20:54:32,259 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:54:32,260 INFO L225 Difference]: With dead ends: 150 [2021-12-18 20:54:32,260 INFO L226 Difference]: Without dead ends: 150 [2021-12-18 20:54:32,260 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-18 20:54:32,261 INFO L933 BasicCegarLoop]: 103 mSDtfsCounter, 12 mSDsluCounter, 97 mSDsCounter, 0 mSdLazyCounter, 11 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 200 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 11 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-18 20:54:32,261 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 200 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 11 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-18 20:54:32,261 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2021-12-18 20:54:32,263 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 137. [2021-12-18 20:54:32,264 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 137 states, 98 states have (on average 1.469387755102041) internal successors, (144), 131 states have internal predecessors, (144), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-12-18 20:54:32,264 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 150 transitions. [2021-12-18 20:54:32,265 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 150 transitions. Word has length 28 [2021-12-18 20:54:32,265 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:54:32,265 INFO L470 AbstractCegarLoop]: Abstraction has 137 states and 150 transitions. [2021-12-18 20:54:32,265 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 8.666666666666666) internal successors, (26), 3 states have internal predecessors, (26), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-18 20:54:32,265 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 150 transitions. [2021-12-18 20:54:32,266 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-12-18 20:54:32,266 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:54:32,266 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 20:54:32,278 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (17)] Forceful destruction successful, exit code 0 [2021-12-18 20:54:32,478 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-18 20:54:32,478 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting appendErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 55 more)] === [2021-12-18 20:54:32,479 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:54:32,479 INFO L85 PathProgramCache]: Analyzing trace with hash 1879513347, now seen corresponding path program 1 times [2021-12-18 20:54:32,479 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-18 20:54:32,479 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [242907203] [2021-12-18 20:54:32,479 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:54:32,479 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-18 20:54:32,480 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-18 20:54:32,482 INFO L229 MonitoredProcess]: Starting monitored process 18 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-18 20:54:32,483 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (18)] Waiting until timeout for monitored process [2021-12-18 20:54:32,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:54:32,673 INFO L263 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 19 conjunts are in the unsatisfiable core [2021-12-18 20:54:32,674 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:54:32,706 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:54:32,884 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:54:32,885 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 16 [2021-12-18 20:54:32,893 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-18 20:54:32,894 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 13 [2021-12-18 20:54:32,920 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 20:54:32,920 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 20:54:33,273 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-18 20:54:33,275 INFO L388 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 53 treesize of output 49 [2021-12-18 20:54:33,401 INFO L354 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2021-12-18 20:54:33,401 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 15 treesize of output 14 [2021-12-18 20:54:33,865 INFO L354 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2021-12-18 20:54:33,865 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 15 treesize of output 14 [2021-12-18 20:54:34,166 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-18 20:54:34,169 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 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 46 treesize of output 42 [2021-12-18 20:54:34,271 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 20:54:34,271 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-18 20:54:34,271 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [242907203] [2021-12-18 20:54:34,271 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [242907203] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-18 20:54:34,271 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-18 20:54:34,271 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 13 [2021-12-18 20:54:34,271 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1451681542] [2021-12-18 20:54:34,271 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-18 20:54:34,272 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-12-18 20:54:34,272 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-18 20:54:34,272 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-12-18 20:54:34,272 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2021-12-18 20:54:34,272 INFO L87 Difference]: Start difference. First operand 137 states and 150 transitions. Second operand has 14 states, 13 states have (on average 4.076923076923077) internal successors, (53), 12 states have internal predecessors, (53), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-18 20:54:35,350 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:54:35,350 INFO L93 Difference]: Finished difference Result 147 states and 155 transitions. [2021-12-18 20:54:35,351 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-12-18 20:54:35,351 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 4.076923076923077) internal successors, (53), 12 states have internal predecessors, (53), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 30 [2021-12-18 20:54:35,351 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:54:35,352 INFO L225 Difference]: With dead ends: 147 [2021-12-18 20:54:35,352 INFO L226 Difference]: Without dead ends: 147 [2021-12-18 20:54:35,352 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=62, Invalid=210, Unknown=0, NotChecked=0, Total=272 [2021-12-18 20:54:35,353 INFO L933 BasicCegarLoop]: 84 mSDtfsCounter, 313 mSDsluCounter, 389 mSDsCounter, 0 mSdLazyCounter, 296 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 315 SdHoareTripleChecker+Valid, 473 SdHoareTripleChecker+Invalid, 518 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 296 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 209 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-12-18 20:54:35,353 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [315 Valid, 473 Invalid, 518 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 296 Invalid, 0 Unknown, 209 Unchecked, 0.9s Time] [2021-12-18 20:54:35,354 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 147 states. [2021-12-18 20:54:35,355 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 147 to 141. [2021-12-18 20:54:35,356 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 141 states, 102 states have (on average 1.411764705882353) internal successors, (144), 135 states have internal predecessors, (144), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-12-18 20:54:35,356 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 150 transitions. [2021-12-18 20:54:35,356 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 150 transitions. Word has length 30 [2021-12-18 20:54:35,357 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:54:35,357 INFO L470 AbstractCegarLoop]: Abstraction has 141 states and 150 transitions. [2021-12-18 20:54:35,357 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 13 states have (on average 4.076923076923077) internal successors, (53), 12 states have internal predecessors, (53), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-18 20:54:35,357 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 150 transitions. [2021-12-18 20:54:35,357 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-12-18 20:54:35,358 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:54:35,358 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 20:54:35,369 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (18)] Forceful destruction successful, exit code 0 [2021-12-18 20:54:35,569 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-18 20:54:35,569 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting appendErr2REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 55 more)] === [2021-12-18 20:54:35,569 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:54:35,569 INFO L85 PathProgramCache]: Analyzing trace with hash 842656368, now seen corresponding path program 1 times [2021-12-18 20:54:35,570 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-18 20:54:35,570 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1515856547] [2021-12-18 20:54:35,570 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:54:35,570 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-18 20:54:35,570 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-18 20:54:35,571 INFO L229 MonitoredProcess]: Starting monitored process 19 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-18 20:54:35,571 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (19)] Waiting until timeout for monitored process [2021-12-18 20:54:35,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:54:35,735 INFO L263 TraceCheckSpWp]: Trace formula consists of 234 conjuncts, 13 conjunts are in the unsatisfiable core [2021-12-18 20:54:35,737 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:54:35,749 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:54:35,909 INFO L354 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2021-12-18 20:54:35,909 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 27 [2021-12-18 20:54:35,942 INFO L354 Elim1Store]: treesize reduction 12, result has 40.0 percent of original size [2021-12-18 20:54:35,942 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 15 treesize of output 20 [2021-12-18 20:54:35,970 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 20:54:35,970 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 20:54:36,164 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 20:54:36,164 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-18 20:54:36,164 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1515856547] [2021-12-18 20:54:36,164 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1515856547] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-18 20:54:36,164 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-18 20:54:36,164 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2021-12-18 20:54:36,164 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1196395933] [2021-12-18 20:54:36,164 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-18 20:54:36,165 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-12-18 20:54:36,165 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-18 20:54:36,165 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-12-18 20:54:36,165 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-12-18 20:54:36,165 INFO L87 Difference]: Start difference. First operand 141 states and 150 transitions. Second operand has 8 states, 7 states have (on average 5.857142857142857) internal successors, (41), 6 states have internal predecessors, (41), 1 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-12-18 20:54:36,455 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:54:36,456 INFO L93 Difference]: Finished difference Result 164 states and 179 transitions. [2021-12-18 20:54:36,456 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-12-18 20:54:36,456 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 5.857142857142857) internal successors, (41), 6 states have internal predecessors, (41), 1 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 31 [2021-12-18 20:54:36,456 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:54:36,457 INFO L225 Difference]: With dead ends: 164 [2021-12-18 20:54:36,457 INFO L226 Difference]: Without dead ends: 164 [2021-12-18 20:54:36,458 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 49 SyntacticMatches, 5 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2021-12-18 20:54:36,458 INFO L933 BasicCegarLoop]: 87 mSDtfsCounter, 28 mSDsluCounter, 302 mSDsCounter, 0 mSdLazyCounter, 175 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 389 SdHoareTripleChecker+Invalid, 289 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 175 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 108 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-18 20:54:36,458 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [28 Valid, 389 Invalid, 289 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 175 Invalid, 0 Unknown, 108 Unchecked, 0.2s Time] [2021-12-18 20:54:36,459 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 164 states. [2021-12-18 20:54:36,462 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 164 to 152. [2021-12-18 20:54:36,462 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 152 states, 110 states have (on average 1.4) internal successors, (154), 144 states have internal predecessors, (154), 5 states have call successors, (5), 4 states have call predecessors, (5), 4 states have return successors, (7), 3 states have call predecessors, (7), 5 states have call successors, (7) [2021-12-18 20:54:36,463 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 166 transitions. [2021-12-18 20:54:36,463 INFO L78 Accepts]: Start accepts. Automaton has 152 states and 166 transitions. Word has length 31 [2021-12-18 20:54:36,463 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:54:36,465 INFO L470 AbstractCegarLoop]: Abstraction has 152 states and 166 transitions. [2021-12-18 20:54:36,465 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 5.857142857142857) internal successors, (41), 6 states have internal predecessors, (41), 1 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-12-18 20:54:36,465 INFO L276 IsEmpty]: Start isEmpty. Operand 152 states and 166 transitions. [2021-12-18 20:54:36,468 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-12-18 20:54:36,468 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:54:36,468 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 20:54:36,479 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (19)] Forceful destruction successful, exit code 0 [2021-12-18 20:54:36,669 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-18 20:54:36,669 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting appendErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 55 more)] === [2021-12-18 20:54:36,669 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:54:36,669 INFO L85 PathProgramCache]: Analyzing trace with hash 842656369, now seen corresponding path program 1 times [2021-12-18 20:54:36,670 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-18 20:54:36,670 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1146534385] [2021-12-18 20:54:36,670 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:54:36,670 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-18 20:54:36,670 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-18 20:54:36,671 INFO L229 MonitoredProcess]: Starting monitored process 20 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-18 20:54:36,672 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (20)] Waiting until timeout for monitored process [2021-12-18 20:54:36,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:54:36,822 INFO L263 TraceCheckSpWp]: Trace formula consists of 234 conjuncts, 20 conjunts are in the unsatisfiable core [2021-12-18 20:54:36,824 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:54:36,846 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:54:36,850 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:54:37,016 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:54:37,017 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-18 20:54:37,023 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-18 20:54:37,023 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 14 treesize of output 14 [2021-12-18 20:54:37,086 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-18 20:54:37,086 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 12 treesize of output 18 [2021-12-18 20:54:37,139 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 20:54:37,140 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 20:54:39,996 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-18 20:54:39,996 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1146534385] [2021-12-18 20:54:39,996 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1146534385] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 20:54:39,996 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1215921058] [2021-12-18 20:54:39,996 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:54:39,996 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-18 20:54:39,997 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2021-12-18 20:54:40,017 INFO L229 MonitoredProcess]: Starting monitored process 21 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-12-18 20:54:40,023 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (21)] Waiting until timeout for monitored process [2021-12-18 20:54:40,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:54:40,330 INFO L263 TraceCheckSpWp]: Trace formula consists of 234 conjuncts, 21 conjunts are in the unsatisfiable core [2021-12-18 20:54:40,332 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:54:40,344 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:54:40,349 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:54:40,549 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:54:40,550 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-18 20:54:40,558 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-18 20:54:40,558 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 14 treesize of output 14 [2021-12-18 20:54:40,609 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-18 20:54:40,609 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 12 treesize of output 18 [2021-12-18 20:54:40,655 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 20:54:40,655 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 20:54:45,161 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1215921058] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 20:54:45,161 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-18 20:54:45,161 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8] total 8 [2021-12-18 20:54:45,162 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [302352221] [2021-12-18 20:54:45,162 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-18 20:54:45,162 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-12-18 20:54:45,162 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-18 20:54:45,162 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-12-18 20:54:45,163 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=125, Unknown=1, NotChecked=0, Total=156 [2021-12-18 20:54:45,163 INFO L87 Difference]: Start difference. First operand 152 states and 166 transitions. Second operand has 9 states, 8 states have (on average 4.625) internal successors, (37), 7 states have internal predecessors, (37), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-18 20:54:45,432 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:54:45,433 INFO L93 Difference]: Finished difference Result 163 states and 183 transitions. [2021-12-18 20:54:45,433 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-12-18 20:54:45,433 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 4.625) internal successors, (37), 7 states have internal predecessors, (37), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 31 [2021-12-18 20:54:45,433 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:54:45,434 INFO L225 Difference]: With dead ends: 163 [2021-12-18 20:54:45,434 INFO L226 Difference]: Without dead ends: 163 [2021-12-18 20:54:45,434 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 61 SyntacticMatches, 4 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 7.2s TimeCoverageRelationStatistics Valid=41, Invalid=168, Unknown=1, NotChecked=0, Total=210 [2021-12-18 20:54:45,435 INFO L933 BasicCegarLoop]: 90 mSDtfsCounter, 12 mSDsluCounter, 289 mSDsCounter, 0 mSdLazyCounter, 115 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 379 SdHoareTripleChecker+Invalid, 207 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 115 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 87 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-18 20:54:45,435 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 379 Invalid, 207 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 115 Invalid, 0 Unknown, 87 Unchecked, 0.2s Time] [2021-12-18 20:54:45,436 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 163 states. [2021-12-18 20:54:45,439 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 163 to 159. [2021-12-18 20:54:45,439 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 159 states, 116 states have (on average 1.3879310344827587) internal successors, (161), 149 states have internal predecessors, (161), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (8), 4 states have call predecessors, (8), 6 states have call successors, (8) [2021-12-18 20:54:45,440 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 159 states to 159 states and 175 transitions. [2021-12-18 20:54:45,440 INFO L78 Accepts]: Start accepts. Automaton has 159 states and 175 transitions. Word has length 31 [2021-12-18 20:54:45,440 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:54:45,440 INFO L470 AbstractCegarLoop]: Abstraction has 159 states and 175 transitions. [2021-12-18 20:54:45,441 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 4.625) internal successors, (37), 7 states have internal predecessors, (37), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-18 20:54:45,441 INFO L276 IsEmpty]: Start isEmpty. Operand 159 states and 175 transitions. [2021-12-18 20:54:45,441 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-12-18 20:54:45,441 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:54:45,441 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 20:54:45,454 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (20)] Forceful destruction successful, exit code 0 [2021-12-18 20:54:45,658 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (21)] Forceful destruction successful, exit code 0 [2021-12-18 20:54:45,855 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3,21 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt [2021-12-18 20:54:45,855 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting appendErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 55 more)] === [2021-12-18 20:54:45,855 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:54:45,855 INFO L85 PathProgramCache]: Analyzing trace with hash -507885641, now seen corresponding path program 1 times [2021-12-18 20:54:45,856 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-18 20:54:45,856 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [112796849] [2021-12-18 20:54:45,856 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:54:45,856 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-18 20:54:45,856 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-18 20:54:45,857 INFO L229 MonitoredProcess]: Starting monitored process 22 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-18 20:54:45,860 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (22)] Waiting until timeout for monitored process [2021-12-18 20:54:46,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:54:46,041 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 20 conjunts are in the unsatisfiable core [2021-12-18 20:54:46,042 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:54:46,060 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:54:46,067 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:54:46,294 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:54:46,295 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-18 20:54:46,304 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-18 20:54:46,304 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 14 treesize of output 14 [2021-12-18 20:54:46,376 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-18 20:54:46,377 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 12 treesize of output 18 [2021-12-18 20:54:46,490 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 20:54:46,491 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 20:54:50,578 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-18 20:54:50,579 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [112796849] [2021-12-18 20:54:50,579 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [112796849] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 20:54:50,579 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [832101789] [2021-12-18 20:54:50,579 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:54:50,579 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-18 20:54:50,580 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2021-12-18 20:54:50,584 INFO L229 MonitoredProcess]: Starting monitored process 23 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-12-18 20:54:50,584 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (23)] Waiting until timeout for monitored process [2021-12-18 20:54:50,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:54:50,840 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 20 conjunts are in the unsatisfiable core [2021-12-18 20:54:50,842 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:54:50,852 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:54:50,857 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:54:51,048 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:54:51,049 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-18 20:54:51,057 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-18 20:54:51,057 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 14 treesize of output 14 [2021-12-18 20:54:51,095 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-18 20:54:51,095 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 12 treesize of output 18 [2021-12-18 20:54:51,171 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 20:54:51,172 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 20:54:53,885 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [832101789] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 20:54:53,885 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-18 20:54:53,885 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 7 [2021-12-18 20:54:53,885 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1269551128] [2021-12-18 20:54:53,885 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-18 20:54:53,886 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-12-18 20:54:53,886 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-18 20:54:53,886 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-12-18 20:54:53,886 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=104, Unknown=1, NotChecked=0, Total=132 [2021-12-18 20:54:53,886 INFO L87 Difference]: Start difference. First operand 159 states and 175 transitions. Second operand has 8 states, 7 states have (on average 4.428571428571429) internal successors, (31), 6 states have internal predecessors, (31), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-18 20:54:54,214 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:54:54,214 INFO L93 Difference]: Finished difference Result 168 states and 190 transitions. [2021-12-18 20:54:54,214 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-12-18 20:54:54,215 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 4.428571428571429) internal successors, (31), 6 states have internal predecessors, (31), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 34 [2021-12-18 20:54:54,215 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:54:54,216 INFO L225 Difference]: With dead ends: 168 [2021-12-18 20:54:54,216 INFO L226 Difference]: Without dead ends: 168 [2021-12-18 20:54:54,216 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 75 SyntacticMatches, 3 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 6.6s TimeCoverageRelationStatistics Valid=37, Invalid=144, Unknown=1, NotChecked=0, Total=182 [2021-12-18 20:54:54,216 INFO L933 BasicCegarLoop]: 94 mSDtfsCounter, 11 mSDsluCounter, 341 mSDsCounter, 0 mSdLazyCounter, 163 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 435 SdHoareTripleChecker+Invalid, 261 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 163 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 93 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-18 20:54:54,217 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 435 Invalid, 261 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 163 Invalid, 0 Unknown, 93 Unchecked, 0.3s Time] [2021-12-18 20:54:54,217 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2021-12-18 20:54:54,220 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 162. [2021-12-18 20:54:54,220 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 162 states, 119 states have (on average 1.3865546218487395) internal successors, (165), 152 states have internal predecessors, (165), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (8), 4 states have call predecessors, (8), 6 states have call successors, (8) [2021-12-18 20:54:54,221 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 179 transitions. [2021-12-18 20:54:54,221 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 179 transitions. Word has length 34 [2021-12-18 20:54:54,221 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:54:54,221 INFO L470 AbstractCegarLoop]: Abstraction has 162 states and 179 transitions. [2021-12-18 20:54:54,221 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 4.428571428571429) internal successors, (31), 6 states have internal predecessors, (31), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-18 20:54:54,222 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 179 transitions. [2021-12-18 20:54:54,222 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-12-18 20:54:54,222 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:54:54,222 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 20:54:54,233 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (22)] Ended with exit code 0 [2021-12-18 20:54:54,436 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (23)] Ended with exit code 0 [2021-12-18 20:54:54,633 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3,23 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt [2021-12-18 20:54:54,633 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting appendErr15REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 55 more)] === [2021-12-18 20:54:54,634 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:54:54,634 INFO L85 PathProgramCache]: Analyzing trace with hash 1435420859, now seen corresponding path program 1 times [2021-12-18 20:54:54,634 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-18 20:54:54,634 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [699186855] [2021-12-18 20:54:54,634 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:54:54,634 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-18 20:54:54,634 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-18 20:54:54,635 INFO L229 MonitoredProcess]: Starting monitored process 24 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-18 20:54:54,636 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (24)] Waiting until timeout for monitored process [2021-12-18 20:54:54,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:54:54,813 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 20 conjunts are in the unsatisfiable core [2021-12-18 20:54:54,815 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:54:54,825 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:54:54,829 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:54:57,025 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:54:57,026 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-18 20:54:57,035 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-18 20:54:57,036 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 14 treesize of output 14 [2021-12-18 20:54:57,102 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-18 20:54:57,102 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 12 treesize of output 18 [2021-12-18 20:54:57,219 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 20:54:57,220 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 20:55:00,199 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-18 20:55:00,200 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [699186855] [2021-12-18 20:55:00,200 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [699186855] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 20:55:00,200 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1941941181] [2021-12-18 20:55:00,200 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:55:00,200 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-18 20:55:00,200 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2021-12-18 20:55:00,201 INFO L229 MonitoredProcess]: Starting monitored process 25 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-12-18 20:55:00,202 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (25)] Waiting until timeout for monitored process [2021-12-18 20:55:00,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:55:00,469 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 21 conjunts are in the unsatisfiable core [2021-12-18 20:55:00,470 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:55:00,490 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:55:00,495 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:55:02,669 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:55:02,670 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-18 20:55:02,680 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-18 20:55:02,680 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 14 treesize of output 14 [2021-12-18 20:55:02,740 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-18 20:55:02,741 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 12 treesize of output 18 [2021-12-18 20:55:02,896 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 20:55:02,897 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 20:55:09,900 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1941941181] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 20:55:09,900 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-18 20:55:09,900 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 7 [2021-12-18 20:55:09,900 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1420616866] [2021-12-18 20:55:09,900 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-18 20:55:09,901 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-12-18 20:55:09,901 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-18 20:55:09,901 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-12-18 20:55:09,901 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=192, Unknown=4, NotChecked=0, Total=240 [2021-12-18 20:55:09,901 INFO L87 Difference]: Start difference. First operand 162 states and 179 transitions. Second operand has 8 states, 7 states have (on average 4.571428571428571) internal successors, (32), 6 states have internal predecessors, (32), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-18 20:55:10,383 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:55:10,383 INFO L93 Difference]: Finished difference Result 168 states and 189 transitions. [2021-12-18 20:55:10,384 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-12-18 20:55:10,384 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 4.571428571428571) internal successors, (32), 6 states have internal predecessors, (32), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 35 [2021-12-18 20:55:10,384 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:55:10,385 INFO L225 Difference]: With dead ends: 168 [2021-12-18 20:55:10,385 INFO L226 Difference]: Without dead ends: 168 [2021-12-18 20:55:10,385 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 75 SyntacticMatches, 3 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 13.7s TimeCoverageRelationStatistics Valid=56, Invalid=246, Unknown=4, NotChecked=0, Total=306 [2021-12-18 20:55:10,386 INFO L933 BasicCegarLoop]: 94 mSDtfsCounter, 10 mSDsluCounter, 299 mSDsCounter, 0 mSdLazyCounter, 115 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 393 SdHoareTripleChecker+Invalid, 206 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 115 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 86 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-12-18 20:55:10,386 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 393 Invalid, 206 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 115 Invalid, 0 Unknown, 86 Unchecked, 0.4s Time] [2021-12-18 20:55:10,386 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2021-12-18 20:55:10,390 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 164. [2021-12-18 20:55:10,390 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 164 states, 121 states have (on average 1.3801652892561984) internal successors, (167), 154 states have internal predecessors, (167), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (8), 4 states have call predecessors, (8), 6 states have call successors, (8) [2021-12-18 20:55:10,391 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 164 states to 164 states and 181 transitions. [2021-12-18 20:55:10,391 INFO L78 Accepts]: Start accepts. Automaton has 164 states and 181 transitions. Word has length 35 [2021-12-18 20:55:10,391 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:55:10,391 INFO L470 AbstractCegarLoop]: Abstraction has 164 states and 181 transitions. [2021-12-18 20:55:10,391 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 4.571428571428571) internal successors, (32), 6 states have internal predecessors, (32), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-18 20:55:10,392 INFO L276 IsEmpty]: Start isEmpty. Operand 164 states and 181 transitions. [2021-12-18 20:55:10,392 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-12-18 20:55:10,392 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:55:10,392 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 20:55:10,399 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (25)] Forceful destruction successful, exit code 0 [2021-12-18 20:55:10,601 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (24)] Ended with exit code 0 [2021-12-18 20:55:10,793 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt,24 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-18 20:55:10,793 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting appendErr15REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 55 more)] === [2021-12-18 20:55:10,793 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:55:10,794 INFO L85 PathProgramCache]: Analyzing trace with hash 748730840, now seen corresponding path program 1 times [2021-12-18 20:55:10,794 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-18 20:55:10,794 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [774074945] [2021-12-18 20:55:10,794 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:55:10,794 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-18 20:55:10,794 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-18 20:55:10,795 INFO L229 MonitoredProcess]: Starting monitored process 26 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-18 20:55:10,796 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (26)] Waiting until timeout for monitored process [2021-12-18 20:55:10,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:55:10,931 INFO L263 TraceCheckSpWp]: Trace formula consists of 250 conjuncts, 5 conjunts are in the unsatisfiable core [2021-12-18 20:55:10,932 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:55:11,048 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 20:55:11,048 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-18 20:55:11,048 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-18 20:55:11,048 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [774074945] [2021-12-18 20:55:11,048 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [774074945] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-18 20:55:11,048 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-18 20:55:11,048 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-12-18 20:55:11,048 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [100322284] [2021-12-18 20:55:11,048 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-18 20:55:11,049 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-12-18 20:55:11,049 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-18 20:55:11,049 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-12-18 20:55:11,049 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-12-18 20:55:11,049 INFO L87 Difference]: Start difference. First operand 164 states and 181 transitions. Second operand has 6 states, 5 states have (on average 6.8) internal successors, (34), 5 states have internal predecessors, (34), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-18 20:55:11,479 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:55:11,480 INFO L93 Difference]: Finished difference Result 163 states and 178 transitions. [2021-12-18 20:55:11,480 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-18 20:55:11,480 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 6.8) internal successors, (34), 5 states have internal predecessors, (34), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 37 [2021-12-18 20:55:11,480 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:55:11,481 INFO L225 Difference]: With dead ends: 163 [2021-12-18 20:55:11,481 INFO L226 Difference]: Without dead ends: 163 [2021-12-18 20:55:11,481 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2021-12-18 20:55:11,482 INFO L933 BasicCegarLoop]: 104 mSDtfsCounter, 108 mSDsluCounter, 279 mSDsCounter, 0 mSdLazyCounter, 108 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 109 SdHoareTripleChecker+Valid, 383 SdHoareTripleChecker+Invalid, 113 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 108 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-12-18 20:55:11,482 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [109 Valid, 383 Invalid, 113 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 108 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-12-18 20:55:11,483 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 163 states. [2021-12-18 20:55:11,486 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 163 to 160. [2021-12-18 20:55:11,486 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 160 states, 121 states have (on average 1.3471074380165289) internal successors, (163), 150 states have internal predecessors, (163), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (8), 4 states have call predecessors, (8), 6 states have call successors, (8) [2021-12-18 20:55:11,487 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 177 transitions. [2021-12-18 20:55:11,487 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 177 transitions. Word has length 37 [2021-12-18 20:55:11,487 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:55:11,487 INFO L470 AbstractCegarLoop]: Abstraction has 160 states and 177 transitions. [2021-12-18 20:55:11,487 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 6.8) internal successors, (34), 5 states have internal predecessors, (34), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-18 20:55:11,487 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 177 transitions. [2021-12-18 20:55:11,488 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-12-18 20:55:11,488 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:55:11,488 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 20:55:11,498 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (26)] Ended with exit code 0 [2021-12-18 20:55:11,698 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-18 20:55:11,698 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting appendErr22REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 55 more)] === [2021-12-18 20:55:11,699 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:55:11,699 INFO L85 PathProgramCache]: Analyzing trace with hash -28201477, now seen corresponding path program 1 times [2021-12-18 20:55:11,699 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-18 20:55:11,699 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [166750419] [2021-12-18 20:55:11,699 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:55:11,699 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-18 20:55:11,699 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-18 20:55:11,700 INFO L229 MonitoredProcess]: Starting monitored process 27 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-18 20:55:11,701 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (27)] Waiting until timeout for monitored process [2021-12-18 20:55:11,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:55:11,965 INFO L263 TraceCheckSpWp]: Trace formula consists of 279 conjuncts, 36 conjunts are in the unsatisfiable core [2021-12-18 20:55:11,968 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:55:11,994 INFO L354 Elim1Store]: treesize reduction 8, result has 60.0 percent of original size [2021-12-18 20:55:11,994 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 12 treesize of output 21 [2021-12-18 20:55:12,079 INFO L354 Elim1Store]: treesize reduction 15, result has 68.1 percent of original size [2021-12-18 20:55:12,079 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 25 treesize of output 51 [2021-12-18 20:55:12,578 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-12-18 20:55:12,681 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-18 20:55:12,681 INFO L388 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 16 treesize of output 22 [2021-12-18 20:55:12,687 INFO L388 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 7 treesize of output 3 [2021-12-18 20:55:12,798 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-18 20:55:12,798 INFO L388 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 20 treesize of output 26 [2021-12-18 20:55:13,037 INFO L354 Elim1Store]: treesize reduction 75, result has 15.7 percent of original size [2021-12-18 20:55:13,037 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 47 treesize of output 53 [2021-12-18 20:55:13,086 INFO L354 Elim1Store]: treesize reduction 4, result has 71.4 percent of original size [2021-12-18 20:55:13,086 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 26 treesize of output 26 [2021-12-18 20:55:13,278 INFO L354 Elim1Store]: treesize reduction 48, result has 43.5 percent of original size [2021-12-18 20:55:13,278 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 33 treesize of output 56 [2021-12-18 20:55:13,399 INFO L388 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 42 treesize of output 40 [2021-12-18 20:55:13,628 INFO L388 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 42 treesize of output 40 [2021-12-18 20:55:13,730 INFO L388 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 42 treesize of output 40 [2021-12-18 20:55:13,835 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 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 45 treesize of output 21 [2021-12-18 20:55:13,945 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 20:55:13,945 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 20:55:14,229 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_1308 (_ BitVec 1)) (v_ArrVal_1311 (Array (_ BitVec 32) (_ BitVec 32))) (v_append_~node~0.base_55 (_ BitVec 32))) (or (not (= (_ bv0 1) (select |c_#valid| v_append_~node~0.base_55))) (= (_ bv0 1) (bvadd (select (store |c_#valid| v_append_~node~0.base_55 v_ArrVal_1308) (select (select (store |c_#memory_$Pointer$.base| v_append_~node~0.base_55 v_ArrVal_1311) |c_append_#in~head.base|) (bvadd |c_append_#in~head.offset| (_ bv4 32)))) (_ bv1 1))) (not (= (_ bv0 1) (bvadd (bvneg v_ArrVal_1308) (_ bv1 1)))))) is different from false [2021-12-18 20:55:14,281 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_1308 (_ BitVec 1)) (v_ArrVal_1311 (Array (_ BitVec 32) (_ BitVec 32))) (v_append_~node~0.base_55 (_ BitVec 32))) (or (not (= (_ bv0 1) (select |c_#valid| v_append_~node~0.base_55))) (not (= (_ bv0 1) (bvadd (bvneg v_ArrVal_1308) (_ bv1 1)))) (= (_ bv0 1) (bvadd (select (store |c_#valid| v_append_~node~0.base_55 v_ArrVal_1308) (select (select (store |c_#memory_$Pointer$.base| v_append_~node~0.base_55 v_ArrVal_1311) |c_ULTIMATE.start_main_~list~0#1.base|) (bvadd |c_ULTIMATE.start_main_~list~0#1.offset| (_ bv4 32)))) (_ bv1 1))))) is different from false [2021-12-18 20:55:14,546 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-18 20:55:14,546 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 36 [2021-12-18 20:55:14,553 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 180 treesize of output 120 [2021-12-18 20:55:14,561 INFO L388 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 94 treesize of output 86 [2021-12-18 20:55:14,568 INFO L388 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 44 treesize of output 40 [2021-12-18 20:55:20,791 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-18 20:55:20,791 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [166750419] [2021-12-18 20:55:20,792 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [166750419] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 20:55:20,792 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [28199794] [2021-12-18 20:55:20,792 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:55:20,792 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-18 20:55:20,792 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2021-12-18 20:55:20,793 INFO L229 MonitoredProcess]: Starting monitored process 28 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-12-18 20:55:20,794 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (28)] Waiting until timeout for monitored process [2021-12-18 20:55:21,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:55:21,157 INFO L263 TraceCheckSpWp]: Trace formula consists of 279 conjuncts, 37 conjunts are in the unsatisfiable core [2021-12-18 20:55:21,160 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:55:21,219 INFO L354 Elim1Store]: treesize reduction 12, result has 40.0 percent of original size [2021-12-18 20:55:21,220 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 14 treesize of output 19 [2021-12-18 20:55:21,347 INFO L354 Elim1Store]: treesize reduction 38, result has 39.7 percent of original size [2021-12-18 20:55:21,347 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 28 treesize of output 45 [2021-12-18 20:55:21,664 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-12-18 20:55:21,706 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-18 20:55:21,707 INFO L388 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 16 treesize of output 22 [2021-12-18 20:55:21,712 INFO L388 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 7 treesize of output 3 [2021-12-18 20:55:21,775 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-18 20:55:21,776 INFO L388 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 20 treesize of output 26 [2021-12-18 20:55:22,038 INFO L354 Elim1Store]: treesize reduction 130, result has 19.3 percent of original size [2021-12-18 20:55:22,039 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 2 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 5 new quantified variables, introduced 7 case distinctions, treesize of input 54 treesize of output 74 [2021-12-18 20:55:22,124 INFO L354 Elim1Store]: treesize reduction 16, result has 56.8 percent of original size [2021-12-18 20:55:22,124 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 46 treesize of output 52 [2021-12-18 20:55:22,593 INFO L354 Elim1Store]: treesize reduction 65, result has 40.9 percent of original size [2021-12-18 20:55:22,594 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 40 treesize of output 71 [2021-12-18 20:55:22,777 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 40 [2021-12-18 20:55:23,170 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 40 [2021-12-18 20:55:23,367 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 40 [2021-12-18 20:55:23,488 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 21 [2021-12-18 20:55:23,613 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 20:55:23,614 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 20:55:23,635 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_1410 (Array (_ BitVec 32) (_ BitVec 32)))) (= (_ bv0 1) (bvadd (select |c_#valid| (select (select (store |c_#memory_$Pointer$.base| c_append_~node~0.base v_ArrVal_1410) c_append_~head.base) (bvadd c_append_~head.offset (_ bv4 32)))) (_ bv1 1)))) is different from false [2021-12-18 20:55:23,706 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_append_~node~0.base_59 (_ BitVec 32)) (v_ArrVal_1407 (_ BitVec 1)) (v_ArrVal_1410 (Array (_ BitVec 32) (_ BitVec 32)))) (or (not (= (_ bv0 1) (select |c_#valid| v_append_~node~0.base_59))) (= (_ bv0 1) (bvadd (select (store |c_#valid| v_append_~node~0.base_59 v_ArrVal_1407) (select (select (store |c_#memory_$Pointer$.base| v_append_~node~0.base_59 v_ArrVal_1410) |c_append_#in~head.base|) (bvadd |c_append_#in~head.offset| (_ bv4 32)))) (_ bv1 1))))) is different from false [2021-12-18 20:55:23,738 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_append_~node~0.base_59 (_ BitVec 32)) (v_ArrVal_1407 (_ BitVec 1)) (v_ArrVal_1410 (Array (_ BitVec 32) (_ BitVec 32)))) (or (not (= (_ bv0 1) (select |c_#valid| v_append_~node~0.base_59))) (= (_ bv0 1) (bvadd (select (store |c_#valid| v_append_~node~0.base_59 v_ArrVal_1407) (select (select (store |c_#memory_$Pointer$.base| v_append_~node~0.base_59 v_ArrVal_1410) |c_ULTIMATE.start_main_~list~0#1.base|) (bvadd |c_ULTIMATE.start_main_~list~0#1.offset| (_ bv4 32)))) (_ bv1 1))))) is different from false [2021-12-18 20:55:24,073 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-18 20:55:24,073 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 36 [2021-12-18 20:55:24,080 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 180 treesize of output 120 [2021-12-18 20:55:24,089 INFO L388 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 48 treesize of output 44 [2021-12-18 20:55:24,098 INFO L388 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 90 treesize of output 82 [2021-12-18 20:55:32,309 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [28199794] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 20:55:32,310 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-18 20:55:32,310 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12] total 21 [2021-12-18 20:55:32,310 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2127076444] [2021-12-18 20:55:32,310 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-18 20:55:32,310 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-12-18 20:55:32,310 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-18 20:55:32,311 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-12-18 20:55:32,311 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=661, Unknown=14, NotChecked=280, Total=1056 [2021-12-18 20:55:32,311 INFO L87 Difference]: Start difference. First operand 160 states and 177 transitions. Second operand has 23 states, 22 states have (on average 2.909090909090909) internal successors, (64), 19 states have internal predecessors, (64), 4 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-18 20:55:33,853 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:55:33,853 INFO L93 Difference]: Finished difference Result 204 states and 224 transitions. [2021-12-18 20:55:33,854 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-12-18 20:55:33,854 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 22 states have (on average 2.909090909090909) internal successors, (64), 19 states have internal predecessors, (64), 4 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 39 [2021-12-18 20:55:33,854 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:55:33,855 INFO L225 Difference]: With dead ends: 204 [2021-12-18 20:55:33,855 INFO L226 Difference]: Without dead ends: 204 [2021-12-18 20:55:33,855 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 72 SyntacticMatches, 7 SemanticMatches, 40 ConstructedPredicates, 5 IntricatePredicates, 0 DeprecatedPredicates, 324 ImplicationChecksByTransitivity, 16.7s TimeCoverageRelationStatistics Valid=170, Invalid=1168, Unknown=14, NotChecked=370, Total=1722 [2021-12-18 20:55:33,856 INFO L933 BasicCegarLoop]: 71 mSDtfsCounter, 98 mSDsluCounter, 839 mSDsCounter, 0 mSdLazyCounter, 269 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 98 SdHoareTripleChecker+Valid, 910 SdHoareTripleChecker+Invalid, 557 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 269 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 276 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-12-18 20:55:33,856 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [98 Valid, 910 Invalid, 557 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 269 Invalid, 0 Unknown, 276 Unchecked, 0.7s Time] [2021-12-18 20:55:33,856 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 204 states. [2021-12-18 20:55:33,860 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 204 to 172. [2021-12-18 20:55:33,861 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 172 states, 133 states have (on average 1.330827067669173) internal successors, (177), 161 states have internal predecessors, (177), 6 states have call successors, (6), 6 states have call predecessors, (6), 4 states have return successors, (8), 4 states have call predecessors, (8), 6 states have call successors, (8) [2021-12-18 20:55:33,862 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 172 states to 172 states and 191 transitions. [2021-12-18 20:55:33,862 INFO L78 Accepts]: Start accepts. Automaton has 172 states and 191 transitions. Word has length 39 [2021-12-18 20:55:33,862 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:55:33,862 INFO L470 AbstractCegarLoop]: Abstraction has 172 states and 191 transitions. [2021-12-18 20:55:33,863 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 22 states have (on average 2.909090909090909) internal successors, (64), 19 states have internal predecessors, (64), 4 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-18 20:55:33,863 INFO L276 IsEmpty]: Start isEmpty. Operand 172 states and 191 transitions. [2021-12-18 20:55:33,863 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-12-18 20:55:33,863 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:55:33,863 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 20:55:33,875 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (28)] Forceful destruction successful, exit code 0 [2021-12-18 20:55:34,077 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (27)] Ended with exit code 0 [2021-12-18 20:55:34,269 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt,27 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-18 20:55:34,269 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting appendErr23REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 55 more)] === [2021-12-18 20:55:34,269 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:55:34,269 INFO L85 PathProgramCache]: Analyzing trace with hash -28201476, now seen corresponding path program 1 times [2021-12-18 20:55:34,270 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-18 20:55:34,270 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1315513114] [2021-12-18 20:55:34,270 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:55:34,270 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-18 20:55:34,270 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-18 20:55:34,271 INFO L229 MonitoredProcess]: Starting monitored process 29 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-18 20:55:34,272 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (29)] Waiting until timeout for monitored process [2021-12-18 20:55:34,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:55:34,538 INFO L263 TraceCheckSpWp]: Trace formula consists of 279 conjuncts, 50 conjunts are in the unsatisfiable core [2021-12-18 20:55:34,541 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:55:34,549 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:55:34,594 INFO L354 Elim1Store]: treesize reduction 12, result has 40.0 percent of original size [2021-12-18 20:55:34,595 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 15 treesize of output 20 [2021-12-18 20:55:34,652 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:55:35,091 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-12-18 20:55:35,109 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-12-18 20:55:35,226 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-18 20:55:35,227 INFO L388 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 16 treesize of output 22 [2021-12-18 20:55:35,233 INFO L388 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 7 treesize of output 3 [2021-12-18 20:55:35,287 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-18 20:55:35,287 INFO L388 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 16 treesize of output 22 [2021-12-18 20:55:35,299 INFO L388 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 7 treesize of output 3 [2021-12-18 20:55:35,468 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-18 20:55:35,468 INFO L388 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 20 treesize of output 26 [2021-12-18 20:55:35,523 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-18 20:55:35,523 INFO L388 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 20 treesize of output 26 [2021-12-18 20:55:36,024 INFO L354 Elim1Store]: treesize reduction 75, result has 15.7 percent of original size [2021-12-18 20:55:36,024 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 71 treesize of output 77 [2021-12-18 20:55:36,120 INFO L354 Elim1Store]: treesize reduction 4, result has 71.4 percent of original size [2021-12-18 20:55:36,121 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 26 treesize of output 26 [2021-12-18 20:55:36,479 INFO L354 Elim1Store]: treesize reduction 23, result has 47.7 percent of original size [2021-12-18 20:55:36,480 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 30 [2021-12-18 20:55:36,569 INFO L354 Elim1Store]: treesize reduction 8, result has 65.2 percent of original size [2021-12-18 20:55:36,569 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 2 case distinctions, treesize of input 27 treesize of output 29 [2021-12-18 20:55:36,722 INFO L388 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 16 treesize of output 18 [2021-12-18 20:55:36,736 INFO L388 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 38 treesize of output 36 [2021-12-18 20:55:36,898 INFO L388 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 16 treesize of output 18 [2021-12-18 20:55:36,907 INFO L388 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 38 treesize of output 36 [2021-12-18 20:55:36,958 INFO L388 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 38 treesize of output 36 [2021-12-18 20:55:36,968 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 18 [2021-12-18 20:55:37,038 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 13 [2021-12-18 20:55:37,049 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 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 19 treesize of output 7 [2021-12-18 20:55:37,093 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 20:55:37,093 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 20:55:37,339 WARN L838 $PredicateComparison]: unable to prove that (and (forall ((v_ArrVal_1516 (Array (_ BitVec 32) (_ BitVec 32)))) (let ((.cse0 (select (select (store |c_#memory_$Pointer$.offset| c_append_~node~0.base v_ArrVal_1516) c_append_~head.base) (bvadd c_append_~head.offset (_ bv4 32))))) (bvule (bvadd .cse0 (_ bv5 32)) (bvadd .cse0 (_ bv9 32))))) (forall ((v_ArrVal_1517 (Array (_ BitVec 32) (_ BitVec 32))) (v_ArrVal_1516 (Array (_ BitVec 32) (_ BitVec 32)))) (let ((.cse1 (bvadd c_append_~head.offset (_ bv4 32)))) (bvule (bvadd (select (select (store |c_#memory_$Pointer$.offset| c_append_~node~0.base v_ArrVal_1516) c_append_~head.base) .cse1) (_ bv9 32)) (select |c_#length| (select (select (store |c_#memory_$Pointer$.base| c_append_~node~0.base v_ArrVal_1517) c_append_~head.base) .cse1)))))) is different from false [2021-12-18 20:55:37,623 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_append_~node~0.base_63 (_ BitVec 32))) (or (not (= (_ bv0 1) (select |c_#valid| v_append_~node~0.base_63))) (and (forall ((v_ArrVal_1516 (Array (_ BitVec 32) (_ BitVec 32)))) (let ((.cse0 (select (select (store |c_#memory_$Pointer$.offset| v_append_~node~0.base_63 v_ArrVal_1516) |c_append_#in~head.base|) (bvadd |c_append_#in~head.offset| (_ bv4 32))))) (bvule (bvadd .cse0 (_ bv5 32)) (bvadd .cse0 (_ bv9 32))))) (forall ((v_ArrVal_1517 (Array (_ BitVec 32) (_ BitVec 32))) (v_ArrVal_1511 (_ BitVec 32)) (v_ArrVal_1516 (Array (_ BitVec 32) (_ BitVec 32)))) (let ((.cse1 (bvadd |c_append_#in~head.offset| (_ bv4 32)))) (bvule (bvadd (select (select (store |c_#memory_$Pointer$.offset| v_append_~node~0.base_63 v_ArrVal_1516) |c_append_#in~head.base|) .cse1) (_ bv9 32)) (select (store |c_#length| v_append_~node~0.base_63 v_ArrVal_1511) (select (select (store |c_#memory_$Pointer$.base| v_append_~node~0.base_63 v_ArrVal_1517) |c_append_#in~head.base|) .cse1)))))))) is different from false [2021-12-18 20:55:40,644 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-18 20:55:40,645 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 109 treesize of output 110 [2021-12-18 20:55:40,651 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-18 20:55:40,654 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 153 treesize of output 141 [2021-12-18 20:55:40,674 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-18 20:55:40,674 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 141 treesize of output 111 [2021-12-18 20:55:40,684 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-18 20:55:40,687 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 170 treesize of output 140 [2021-12-18 20:55:40,731 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-18 20:55:40,731 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 368 treesize of output 364 [2021-12-18 20:55:40,742 INFO L388 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 364 treesize of output 324 [2021-12-18 20:55:40,753 INFO L388 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 324 treesize of output 272 [2021-12-18 20:55:49,333 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-18 20:55:49,333 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1315513114] [2021-12-18 20:55:49,333 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1315513114] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 20:55:49,333 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1624767754] [2021-12-18 20:55:49,333 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:55:49,333 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-18 20:55:49,334 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2021-12-18 20:55:49,334 INFO L229 MonitoredProcess]: Starting monitored process 30 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-12-18 20:55:49,339 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (30)] Waiting until timeout for monitored process [2021-12-18 20:55:49,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:55:49,795 INFO L263 TraceCheckSpWp]: Trace formula consists of 279 conjuncts, 55 conjunts are in the unsatisfiable core [2021-12-18 20:55:49,798 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:55:49,812 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:55:49,934 INFO L354 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2021-12-18 20:55:49,934 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 27 [2021-12-18 20:55:50,058 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:55:50,393 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-12-18 20:55:50,417 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-12-18 20:55:50,468 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-18 20:55:50,469 INFO L388 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 16 treesize of output 22 [2021-12-18 20:55:50,478 INFO L388 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 7 treesize of output 3 [2021-12-18 20:55:50,529 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-18 20:55:50,529 INFO L388 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 16 treesize of output 22 [2021-12-18 20:55:50,539 INFO L388 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 7 treesize of output 3 [2021-12-18 20:55:50,634 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-18 20:55:50,634 INFO L388 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 20 treesize of output 26 [2021-12-18 20:55:50,676 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-18 20:55:50,676 INFO L388 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 20 treesize of output 26 [2021-12-18 20:55:50,972 INFO L354 Elim1Store]: treesize reduction 75, result has 15.7 percent of original size [2021-12-18 20:55:50,973 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 71 treesize of output 77 [2021-12-18 20:55:51,041 INFO L354 Elim1Store]: treesize reduction 4, result has 71.4 percent of original size [2021-12-18 20:55:51,041 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 34 treesize of output 32 [2021-12-18 20:55:51,391 INFO L354 Elim1Store]: treesize reduction 8, result has 65.2 percent of original size [2021-12-18 20:55:51,392 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 2 case distinctions, treesize of input 27 treesize of output 29 [2021-12-18 20:55:51,408 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 20 [2021-12-18 20:55:51,529 INFO L388 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 16 treesize of output 18 [2021-12-18 20:55:51,542 INFO L388 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 38 treesize of output 36 [2021-12-18 20:55:51,836 INFO L388 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 16 treesize of output 18 [2021-12-18 20:55:51,849 INFO L388 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 38 treesize of output 36 [2021-12-18 20:55:51,914 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 18 [2021-12-18 20:55:51,920 INFO L388 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 38 treesize of output 36 [2021-12-18 20:55:52,022 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 13 [2021-12-18 20:55:52,027 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 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 15 treesize of output 7 [2021-12-18 20:55:52,035 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 20:55:52,036 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 20:55:52,111 WARN L838 $PredicateComparison]: unable to prove that (and (forall ((v_ArrVal_1632 (Array (_ BitVec 32) (_ BitVec 32))) (v_ArrVal_1631 (Array (_ BitVec 32) (_ BitVec 32)))) (let ((.cse0 (bvadd c_append_~head.offset (_ bv4 32)))) (bvule (bvadd (select (select (store |c_#memory_$Pointer$.offset| c_append_~node~0.base v_ArrVal_1632) c_append_~head.base) .cse0) (_ bv9 32)) (select |c_#length| (select (select (store |c_#memory_$Pointer$.base| c_append_~node~0.base v_ArrVal_1631) c_append_~head.base) .cse0))))) (forall ((v_ArrVal_1632 (Array (_ BitVec 32) (_ BitVec 32)))) (let ((.cse1 (select (select (store |c_#memory_$Pointer$.offset| c_append_~node~0.base v_ArrVal_1632) c_append_~head.base) (bvadd c_append_~head.offset (_ bv4 32))))) (bvule (bvadd .cse1 (_ bv5 32)) (bvadd .cse1 (_ bv9 32)))))) is different from false [2021-12-18 20:55:53,224 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_append_~node~0.base_67 (_ BitVec 32))) (or (and (forall ((v_ArrVal_1624 (_ BitVec 32)) (v_ArrVal_1632 (Array (_ BitVec 32) (_ BitVec 32))) (v_ArrVal_1631 (Array (_ BitVec 32) (_ BitVec 32)))) (let ((.cse0 (bvadd |c_ULTIMATE.start_main_~list~0#1.offset| (_ bv4 32)))) (bvule (bvadd (select (select (store |c_#memory_$Pointer$.offset| v_append_~node~0.base_67 v_ArrVal_1632) |c_ULTIMATE.start_main_~list~0#1.base|) .cse0) (_ bv9 32)) (select (store |c_#length| v_append_~node~0.base_67 v_ArrVal_1624) (select (select (store |c_#memory_$Pointer$.base| v_append_~node~0.base_67 v_ArrVal_1631) |c_ULTIMATE.start_main_~list~0#1.base|) .cse0))))) (forall ((v_ArrVal_1632 (Array (_ BitVec 32) (_ BitVec 32)))) (let ((.cse1 (select (select (store |c_#memory_$Pointer$.offset| v_append_~node~0.base_67 v_ArrVal_1632) |c_ULTIMATE.start_main_~list~0#1.base|) (bvadd |c_ULTIMATE.start_main_~list~0#1.offset| (_ bv4 32))))) (bvule (bvadd .cse1 (_ bv5 32)) (bvadd .cse1 (_ bv9 32)))))) (not (= (_ bv0 1) (select |c_#valid| v_append_~node~0.base_67))))) is different from false [2021-12-18 20:55:53,749 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-18 20:55:53,749 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 109 treesize of output 110 [2021-12-18 20:55:53,755 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-18 20:55:53,759 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 153 treesize of output 141 [2021-12-18 20:55:53,783 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-18 20:55:53,783 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 141 treesize of output 111 [2021-12-18 20:55:53,790 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-18 20:55:53,803 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 170 treesize of output 140 [2021-12-18 20:55:53,841 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-18 20:55:53,841 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 580 treesize of output 564 [2021-12-18 20:55:53,853 INFO L388 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 564 treesize of output 508 [2021-12-18 20:55:53,864 INFO L388 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 508 treesize of output 392 [2021-12-18 20:55:57,105 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1624767754] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 20:55:57,105 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-18 20:55:57,105 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 19 [2021-12-18 20:55:57,106 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1798179313] [2021-12-18 20:55:57,106 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-18 20:55:57,106 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-12-18 20:55:57,106 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-18 20:55:57,106 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-12-18 20:55:57,106 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=504, Unknown=21, NotChecked=196, Total=812 [2021-12-18 20:55:57,107 INFO L87 Difference]: Start difference. First operand 172 states and 191 transitions. Second operand has 20 states, 19 states have (on average 3.263157894736842) internal successors, (62), 17 states have internal predecessors, (62), 4 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-18 20:55:58,881 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:55:58,881 INFO L93 Difference]: Finished difference Result 209 states and 230 transitions. [2021-12-18 20:55:58,881 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-12-18 20:55:58,882 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 19 states have (on average 3.263157894736842) internal successors, (62), 17 states have internal predecessors, (62), 4 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 39 [2021-12-18 20:55:58,882 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:55:58,883 INFO L225 Difference]: With dead ends: 209 [2021-12-18 20:55:58,883 INFO L226 Difference]: Without dead ends: 209 [2021-12-18 20:55:58,883 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 78 SyntacticMatches, 4 SemanticMatches, 31 ConstructedPredicates, 4 IntricatePredicates, 0 DeprecatedPredicates, 201 ImplicationChecksByTransitivity, 16.8s TimeCoverageRelationStatistics Valid=127, Invalid=680, Unknown=21, NotChecked=228, Total=1056 [2021-12-18 20:55:58,884 INFO L933 BasicCegarLoop]: 67 mSDtfsCounter, 54 mSDsluCounter, 655 mSDsCounter, 0 mSdLazyCounter, 437 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 722 SdHoareTripleChecker+Invalid, 600 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 437 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 152 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2021-12-18 20:55:58,884 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [54 Valid, 722 Invalid, 600 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 437 Invalid, 0 Unknown, 152 Unchecked, 1.3s Time] [2021-12-18 20:55:58,884 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209 states. [2021-12-18 20:55:58,887 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 209 to 172. [2021-12-18 20:55:58,888 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 172 states, 133 states have (on average 1.3233082706766917) internal successors, (176), 161 states have internal predecessors, (176), 6 states have call successors, (6), 6 states have call predecessors, (6), 4 states have return successors, (8), 4 states have call predecessors, (8), 6 states have call successors, (8) [2021-12-18 20:55:58,889 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 172 states to 172 states and 190 transitions. [2021-12-18 20:55:58,889 INFO L78 Accepts]: Start accepts. Automaton has 172 states and 190 transitions. Word has length 39 [2021-12-18 20:55:58,889 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:55:58,889 INFO L470 AbstractCegarLoop]: Abstraction has 172 states and 190 transitions. [2021-12-18 20:55:58,889 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 19 states have (on average 3.263157894736842) internal successors, (62), 17 states have internal predecessors, (62), 4 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-18 20:55:58,890 INFO L276 IsEmpty]: Start isEmpty. Operand 172 states and 190 transitions. [2021-12-18 20:55:58,890 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-12-18 20:55:58,890 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:55:58,890 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 20:55:58,902 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (30)] Forceful destruction successful, exit code 0 [2021-12-18 20:55:59,111 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (29)] Forceful destruction successful, exit code 0 [2021-12-18 20:55:59,308 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt,29 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-18 20:55:59,309 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting appendErr22REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 55 more)] === [2021-12-18 20:55:59,309 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:55:59,309 INFO L85 PathProgramCache]: Analyzing trace with hash -2125948851, now seen corresponding path program 1 times [2021-12-18 20:55:59,309 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-18 20:55:59,309 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1616547868] [2021-12-18 20:55:59,309 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:55:59,310 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-18 20:55:59,310 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-18 20:55:59,310 INFO L229 MonitoredProcess]: Starting monitored process 31 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-18 20:55:59,311 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (31)] Waiting until timeout for monitored process [2021-12-18 20:55:59,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:55:59,606 INFO L263 TraceCheckSpWp]: Trace formula consists of 282 conjuncts, 52 conjunts are in the unsatisfiable core [2021-12-18 20:55:59,609 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:55:59,616 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:55:59,674 INFO L354 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2021-12-18 20:55:59,674 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 27 [2021-12-18 20:55:59,721 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-12-18 20:55:59,738 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-12-18 20:55:59,823 INFO L354 Elim1Store]: treesize reduction 21, result has 25.0 percent of original size [2021-12-18 20:55:59,824 INFO L388 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 1 case distinctions, treesize of input 21 treesize of output 20 [2021-12-18 20:55:59,842 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:55:59,843 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 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 [2021-12-18 20:56:00,535 WARN L860 $PredicateComparison]: unable to prove that (exists ((append_~node~0.base (_ BitVec 32))) (and (exists ((v_ArrVal_1738 (Array (_ BitVec 32) (_ BitVec 32))) (v_ArrVal_1743 (Array (_ BitVec 32) (_ BitVec 32))) (v_ArrVal_1747 (Array (_ BitVec 32) (_ BitVec 32)))) (= |c_#memory_$Pointer$.base| (store (store (store |c_old(#memory_$Pointer$.base)| append_~node~0.base v_ArrVal_1738) |c_append_#in~head.base| v_ArrVal_1743) append_~node~0.base v_ArrVal_1747))) (exists ((v_ArrVal_1739 (Array (_ BitVec 32) (_ BitVec 32))) (v_ArrVal_1742 (Array (_ BitVec 32) (_ BitVec 32))) (v_ArrVal_1746 (Array (_ BitVec 32) (_ BitVec 32)))) (= |c_#memory_$Pointer$.offset| (store (store (store |c_old(#memory_$Pointer$.offset)| append_~node~0.base v_ArrVal_1739) |c_append_#in~head.base| v_ArrVal_1742) append_~node~0.base v_ArrVal_1746))) (exists ((v_ArrVal_1737 (_ BitVec 1))) (= |c_#valid| (store |c_old(#valid)| append_~node~0.base v_ArrVal_1737))) (= (_ bv0 1) (select |c_old(#valid)| append_~node~0.base)))) is different from true [2021-12-18 20:56:00,616 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:56:00,619 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:56:00,620 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 21 [2021-12-18 20:56:00,633 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:56:00,636 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:56:00,637 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 21 [2021-12-18 20:56:00,719 INFO L354 Elim1Store]: treesize reduction 30, result has 45.5 percent of original size [2021-12-18 20:56:00,719 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 29 treesize of output 46 [2021-12-18 20:56:01,080 INFO L354 Elim1Store]: treesize reduction 8, result has 52.9 percent of original size [2021-12-18 20:56:01,080 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 2 case distinctions, treesize of input 25 treesize of output 27 [2021-12-18 20:56:01,186 INFO L388 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 [2021-12-18 20:56:01,193 INFO L388 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 [2021-12-18 20:56:01,283 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-12-18 20:56:01,289 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-12-18 20:56:01,392 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 20:56:01,393 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 20:56:01,440 WARN L838 $PredicateComparison]: unable to prove that (and (forall ((v_ArrVal_1749 (Array (_ BitVec 32) (_ BitVec 32)))) (= (select (select (store |c_#memory_$Pointer$.base| c_append_~node~0.base v_ArrVal_1749) c_append_~head.base) c_append_~head.offset) (_ bv0 32))) (forall ((v_ArrVal_1748 (Array (_ BitVec 32) (_ BitVec 32)))) (= (select (select (store |c_#memory_$Pointer$.offset| c_append_~node~0.base v_ArrVal_1748) c_append_~head.base) c_append_~head.offset) (_ bv0 32)))) is different from false [2021-12-18 20:56:01,509 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_append_~node~0.base_71 (_ BitVec 32))) (or (and (forall ((v_ArrVal_1748 (Array (_ BitVec 32) (_ BitVec 32)))) (= (select (select (store |c_#memory_$Pointer$.offset| v_append_~node~0.base_71 v_ArrVal_1748) |c_append_#in~head.base|) |c_append_#in~head.offset|) (_ bv0 32))) (forall ((v_ArrVal_1749 (Array (_ BitVec 32) (_ BitVec 32)))) (= (select (select (store |c_#memory_$Pointer$.base| v_append_~node~0.base_71 v_ArrVal_1749) |c_append_#in~head.base|) |c_append_#in~head.offset|) (_ bv0 32)))) (not (= (_ bv0 1) (select |c_#valid| v_append_~node~0.base_71))))) is different from false [2021-12-18 20:56:04,527 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-18 20:56:04,527 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1616547868] [2021-12-18 20:56:04,527 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1616547868] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 20:56:04,527 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1623221341] [2021-12-18 20:56:04,527 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:56:04,527 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-18 20:56:04,527 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2021-12-18 20:56:04,528 INFO L229 MonitoredProcess]: Starting monitored process 32 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-12-18 20:56:04,529 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (32)] Waiting until timeout for monitored process [2021-12-18 20:56:05,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:56:05,123 INFO L263 TraceCheckSpWp]: Trace formula consists of 282 conjuncts, 58 conjunts are in the unsatisfiable core [2021-12-18 20:56:05,144 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:56:05,153 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:56:05,215 INFO L354 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2021-12-18 20:56:05,215 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 27 [2021-12-18 20:56:05,331 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-12-18 20:56:05,346 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-12-18 20:56:05,434 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:56:05,435 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 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 [2021-12-18 20:56:05,452 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:56:05,452 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 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 [2021-12-18 20:56:06,161 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:56:06,164 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:56:06,165 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 21 [2021-12-18 20:56:06,174 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:56:06,177 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:56:06,178 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 21 [2021-12-18 20:56:06,242 INFO L354 Elim1Store]: treesize reduction 30, result has 45.5 percent of original size [2021-12-18 20:56:06,243 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 29 treesize of output 46 [2021-12-18 20:56:06,580 INFO L354 Elim1Store]: treesize reduction 8, result has 52.9 percent of original size [2021-12-18 20:56:06,580 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 2 case distinctions, treesize of input 25 treesize of output 27 [2021-12-18 20:56:06,690 INFO L388 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 [2021-12-18 20:56:06,701 INFO L388 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 [2021-12-18 20:56:07,043 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 20:56:07,043 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 20:56:07,100 WARN L838 $PredicateComparison]: unable to prove that (and (forall ((v_ArrVal_1876 (Array (_ BitVec 32) (_ BitVec 32)))) (= (select (select (store |c_#memory_$Pointer$.offset| c_append_~node~0.base v_ArrVal_1876) c_append_~head.base) c_append_~head.offset) (_ bv0 32))) (forall ((v_ArrVal_1877 (Array (_ BitVec 32) (_ BitVec 32)))) (= (select (select (store |c_#memory_$Pointer$.base| c_append_~node~0.base v_ArrVal_1877) c_append_~head.base) c_append_~head.offset) (_ bv0 32)))) is different from false [2021-12-18 20:56:07,155 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_append_~node~0.base_75 (_ BitVec 32))) (or (not (= (_ bv0 1) (select |c_#valid| v_append_~node~0.base_75))) (and (forall ((v_ArrVal_1877 (Array (_ BitVec 32) (_ BitVec 32)))) (= (select (select (store |c_#memory_$Pointer$.base| v_append_~node~0.base_75 v_ArrVal_1877) |c_append_#in~head.base|) |c_append_#in~head.offset|) (_ bv0 32))) (forall ((v_ArrVal_1876 (Array (_ BitVec 32) (_ BitVec 32)))) (= (select (select (store |c_#memory_$Pointer$.offset| v_append_~node~0.base_75 v_ArrVal_1876) |c_append_#in~head.base|) |c_append_#in~head.offset|) (_ bv0 32)))))) is different from false [2021-12-18 20:56:10,200 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1623221341] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 20:56:10,200 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-18 20:56:10,200 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 26 [2021-12-18 20:56:10,200 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [440579300] [2021-12-18 20:56:10,200 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-18 20:56:10,200 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-12-18 20:56:10,201 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-18 20:56:10,201 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-12-18 20:56:10,201 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=644, Unknown=39, NotChecked=280, Total=1056 [2021-12-18 20:56:10,201 INFO L87 Difference]: Start difference. First operand 172 states and 190 transitions. Second operand has 26 states, 26 states have (on average 2.0384615384615383) internal successors, (53), 23 states have internal predecessors, (53), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-18 20:56:11,151 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:56:11,151 INFO L93 Difference]: Finished difference Result 203 states and 223 transitions. [2021-12-18 20:56:11,151 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-12-18 20:56:11,152 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.0384615384615383) internal successors, (53), 23 states have internal predecessors, (53), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 40 [2021-12-18 20:56:11,152 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:56:11,153 INFO L225 Difference]: With dead ends: 203 [2021-12-18 20:56:11,153 INFO L226 Difference]: Without dead ends: 203 [2021-12-18 20:56:11,153 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 75 SyntacticMatches, 7 SemanticMatches, 32 ConstructedPredicates, 5 IntricatePredicates, 0 DeprecatedPredicates, 204 ImplicationChecksByTransitivity, 6.9s TimeCoverageRelationStatistics Valid=99, Invalid=694, Unknown=39, NotChecked=290, Total=1122 [2021-12-18 20:56:11,154 INFO L933 BasicCegarLoop]: 76 mSDtfsCounter, 52 mSDsluCounter, 990 mSDsCounter, 0 mSdLazyCounter, 295 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 1066 SdHoareTripleChecker+Invalid, 958 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 295 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 659 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-12-18 20:56:11,154 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [52 Valid, 1066 Invalid, 958 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 295 Invalid, 0 Unknown, 659 Unchecked, 0.7s Time] [2021-12-18 20:56:11,154 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 203 states. [2021-12-18 20:56:11,157 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 203 to 171. [2021-12-18 20:56:11,158 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 171 states, 132 states have (on average 1.3181818181818181) internal successors, (174), 160 states have internal predecessors, (174), 6 states have call successors, (6), 6 states have call predecessors, (6), 4 states have return successors, (8), 4 states have call predecessors, (8), 6 states have call successors, (8) [2021-12-18 20:56:11,158 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 171 states to 171 states and 188 transitions. [2021-12-18 20:56:11,159 INFO L78 Accepts]: Start accepts. Automaton has 171 states and 188 transitions. Word has length 40 [2021-12-18 20:56:11,159 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:56:11,159 INFO L470 AbstractCegarLoop]: Abstraction has 171 states and 188 transitions. [2021-12-18 20:56:11,159 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 2.0384615384615383) internal successors, (53), 23 states have internal predecessors, (53), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-18 20:56:11,159 INFO L276 IsEmpty]: Start isEmpty. Operand 171 states and 188 transitions. [2021-12-18 20:56:11,160 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-12-18 20:56:11,160 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:56:11,160 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 20:56:11,174 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (31)] Forceful destruction successful, exit code 0 [2021-12-18 20:56:11,376 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (32)] Ended with exit code 0 [2021-12-18 20:56:11,572 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3,32 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt [2021-12-18 20:56:11,572 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting appendErr22REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 55 more)] === [2021-12-18 20:56:11,573 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:56:11,573 INFO L85 PathProgramCache]: Analyzing trace with hash 1029452670, now seen corresponding path program 1 times [2021-12-18 20:56:11,573 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-18 20:56:11,573 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [423053033] [2021-12-18 20:56:11,573 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:56:11,573 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-18 20:56:11,574 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-18 20:56:11,574 INFO L229 MonitoredProcess]: Starting monitored process 33 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-18 20:56:11,575 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (33)] Waiting until timeout for monitored process [2021-12-18 20:56:11,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:56:11,843 INFO L263 TraceCheckSpWp]: Trace formula consists of 286 conjuncts, 33 conjunts are in the unsatisfiable core [2021-12-18 20:56:11,845 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:56:11,852 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:56:11,886 INFO L354 Elim1Store]: treesize reduction 12, result has 40.0 percent of original size [2021-12-18 20:56:11,886 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 15 treesize of output 20 [2021-12-18 20:56:12,126 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-12-18 20:56:12,202 INFO L354 Elim1Store]: treesize reduction 21, result has 25.0 percent of original size [2021-12-18 20:56:12,202 INFO L388 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 [2021-12-18 20:56:12,273 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-18 20:56:12,274 INFO L388 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 1 case distinctions, treesize of input 14 treesize of output 20 [2021-12-18 20:56:12,279 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2021-12-18 20:56:12,379 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-18 20:56:12,380 INFO L388 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 1 case distinctions, treesize of input 18 treesize of output 24 [2021-12-18 20:56:12,495 INFO L354 Elim1Store]: treesize reduction 4, result has 66.7 percent of original size [2021-12-18 20:56:12,495 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 38 treesize of output 36 [2021-12-18 20:56:12,650 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-18 20:56:12,650 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 13 [2021-12-18 20:56:12,729 INFO L388 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 23 treesize of output 23 [2021-12-18 20:56:12,795 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 12 [2021-12-18 20:56:12,909 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 5 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 20:56:12,909 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 20:56:13,029 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_1995 (Array (_ BitVec 32) (_ BitVec 32)))) (not (= (_ bv0 32) (select (select (store |c_#memory_$Pointer$.base| c_append_~node~0.base v_ArrVal_1995) c_append_~head.base) c_append_~head.offset)))) is different from false [2021-12-18 20:56:13,050 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_append_~node~0.base_79 (_ BitVec 32)) (v_ArrVal_1995 (Array (_ BitVec 32) (_ BitVec 32)))) (or (not (= (_ bv0 1) (select |c_#valid| v_append_~node~0.base_79))) (not (= (_ bv0 32) (select (select (store |c_#memory_$Pointer$.base| v_append_~node~0.base_79 v_ArrVal_1995) |c_append_#in~head.base|) |c_append_#in~head.offset|))))) is different from false [2021-12-18 20:56:13,070 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_append_~node~0.base_79 (_ BitVec 32)) (v_ArrVal_1995 (Array (_ BitVec 32) (_ BitVec 32)))) (or (not (= (_ bv0 1) (select |c_#valid| v_append_~node~0.base_79))) (not (= (_ bv0 32) (select (select (store |c_#memory_$Pointer$.base| v_append_~node~0.base_79 v_ArrVal_1995) |c_ULTIMATE.start_main_~list~0#1.base|) |c_ULTIMATE.start_main_~list~0#1.offset|))))) is different from false [2021-12-18 20:56:13,365 INFO L354 Elim1Store]: treesize reduction 21, result has 47.5 percent of original size [2021-12-18 20:56:13,365 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 33 [2021-12-18 20:56:13,370 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-18 20:56:13,373 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 50 treesize of output 30 [2021-12-18 20:56:13,381 INFO L388 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 20 treesize of output 18 [2021-12-18 20:56:13,400 INFO L354 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2021-12-18 20:56:13,401 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 15 treesize of output 14 [2021-12-18 20:56:13,961 INFO L354 Elim1Store]: treesize reduction 21, result has 47.5 percent of original size [2021-12-18 20:56:13,961 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 33 [2021-12-18 20:56:13,984 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-18 20:56:13,984 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 131 treesize of output 130 [2021-12-18 20:56:13,991 INFO L388 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 114 treesize of output 110 [2021-12-18 20:56:13,998 INFO L388 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 110 treesize of output 102 [2021-12-18 20:56:14,367 INFO L354 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2021-12-18 20:56:14,368 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 15 treesize of output 14 [2021-12-18 20:56:14,749 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 3 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 4 not checked. [2021-12-18 20:56:14,749 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-18 20:56:14,749 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [423053033] [2021-12-18 20:56:14,749 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [423053033] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-18 20:56:14,749 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-18 20:56:14,750 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15] total 27 [2021-12-18 20:56:14,750 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2050648999] [2021-12-18 20:56:14,750 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-18 20:56:14,750 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-12-18 20:56:14,750 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-18 20:56:14,750 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-12-18 20:56:14,751 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=465, Unknown=8, NotChecked=138, Total=702 [2021-12-18 20:56:14,751 INFO L87 Difference]: Start difference. First operand 171 states and 188 transitions. Second operand has 27 states, 27 states have (on average 2.3703703703703702) internal successors, (64), 23 states have internal predecessors, (64), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-18 20:56:16,519 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:56:16,519 INFO L93 Difference]: Finished difference Result 223 states and 246 transitions. [2021-12-18 20:56:16,520 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-12-18 20:56:16,520 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 2.3703703703703702) internal successors, (64), 23 states have internal predecessors, (64), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 41 [2021-12-18 20:56:16,520 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:56:16,521 INFO L225 Difference]: With dead ends: 223 [2021-12-18 20:56:16,521 INFO L226 Difference]: Without dead ends: 223 [2021-12-18 20:56:16,522 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 52 SyntacticMatches, 4 SemanticMatches, 32 ConstructedPredicates, 3 IntricatePredicates, 0 DeprecatedPredicates, 186 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=142, Invalid=786, Unknown=14, NotChecked=180, Total=1122 [2021-12-18 20:56:16,522 INFO L933 BasicCegarLoop]: 71 mSDtfsCounter, 78 mSDsluCounter, 950 mSDsCounter, 0 mSdLazyCounter, 498 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 78 SdHoareTripleChecker+Valid, 1021 SdHoareTripleChecker+Invalid, 993 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 498 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 482 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2021-12-18 20:56:16,522 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [78 Valid, 1021 Invalid, 993 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 498 Invalid, 0 Unknown, 482 Unchecked, 1.3s Time] [2021-12-18 20:56:16,523 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 223 states. [2021-12-18 20:56:16,526 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 223 to 175. [2021-12-18 20:56:16,526 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 175 states, 135 states have (on average 1.3037037037037038) internal successors, (176), 163 states have internal predecessors, (176), 7 states have call successors, (7), 6 states have call predecessors, (7), 4 states have return successors, (9), 5 states have call predecessors, (9), 7 states have call successors, (9) [2021-12-18 20:56:16,527 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 175 states to 175 states and 192 transitions. [2021-12-18 20:56:16,527 INFO L78 Accepts]: Start accepts. Automaton has 175 states and 192 transitions. Word has length 41 [2021-12-18 20:56:16,527 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:56:16,527 INFO L470 AbstractCegarLoop]: Abstraction has 175 states and 192 transitions. [2021-12-18 20:56:16,528 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 2.3703703703703702) internal successors, (64), 23 states have internal predecessors, (64), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-18 20:56:16,528 INFO L276 IsEmpty]: Start isEmpty. Operand 175 states and 192 transitions. [2021-12-18 20:56:16,528 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-12-18 20:56:16,528 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:56:16,528 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 20:56:16,545 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (33)] Forceful destruction successful, exit code 0 [2021-12-18 20:56:16,733 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-18 20:56:16,733 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting appendErr22REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 55 more)] === [2021-12-18 20:56:16,734 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:56:16,734 INFO L85 PathProgramCache]: Analyzing trace with hash -566111920, now seen corresponding path program 1 times [2021-12-18 20:56:16,734 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-18 20:56:16,734 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [564421117] [2021-12-18 20:56:16,734 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:56:16,734 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-18 20:56:16,735 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-18 20:56:16,737 INFO L229 MonitoredProcess]: Starting monitored process 34 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-18 20:56:16,740 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (34)] Waiting until timeout for monitored process [2021-12-18 20:56:17,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:56:17,105 INFO L263 TraceCheckSpWp]: Trace formula consists of 289 conjuncts, 51 conjunts are in the unsatisfiable core [2021-12-18 20:56:17,109 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:56:17,118 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:56:17,184 INFO L354 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2021-12-18 20:56:17,184 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 27 [2021-12-18 20:56:17,258 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-12-18 20:56:17,269 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-12-18 20:56:17,992 WARN L860 $PredicateComparison]: unable to prove that (exists ((append_~node~0.base (_ BitVec 32))) (and (exists ((v_ArrVal_2098 (Array (_ BitVec 32) (_ BitVec 32))) (v_ArrVal_2102 (Array (_ BitVec 32) (_ BitVec 32))) (v_ArrVal_2094 (Array (_ BitVec 32) (_ BitVec 32)))) (= |c_#memory_$Pointer$.offset| (store (store (store |c_old(#memory_$Pointer$.offset)| append_~node~0.base v_ArrVal_2094) |c_append_#in~head.base| v_ArrVal_2098) append_~node~0.base v_ArrVal_2102))) (exists ((v_ArrVal_2099 (Array (_ BitVec 32) (_ BitVec 32))) (v_ArrVal_2103 (Array (_ BitVec 32) (_ BitVec 32))) (v_ArrVal_2093 (Array (_ BitVec 32) (_ BitVec 32)))) (= |c_#memory_$Pointer$.base| (store (store (store |c_old(#memory_$Pointer$.base)| append_~node~0.base v_ArrVal_2093) |c_append_#in~head.base| v_ArrVal_2099) append_~node~0.base v_ArrVal_2103))) (exists ((v_ArrVal_2092 (_ BitVec 1))) (= |c_#valid| (store |c_old(#valid)| append_~node~0.base v_ArrVal_2092))) (= (_ bv0 1) (select |c_old(#valid)| append_~node~0.base)))) is different from true [2021-12-18 20:56:18,047 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:56:18,049 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:56:18,051 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 23 [2021-12-18 20:56:18,060 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:56:18,062 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:56:18,063 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 23 [2021-12-18 20:56:18,120 INFO L354 Elim1Store]: treesize reduction 30, result has 45.5 percent of original size [2021-12-18 20:56:18,121 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 29 treesize of output 46 [2021-12-18 20:56:18,414 INFO L354 Elim1Store]: treesize reduction 8, result has 52.9 percent of original size [2021-12-18 20:56:18,415 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 2 case distinctions, treesize of input 25 treesize of output 27 [2021-12-18 20:56:18,505 INFO L388 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 16 treesize of output 18 [2021-12-18 20:56:18,511 INFO L388 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 16 treesize of output 18 [2021-12-18 20:56:18,617 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-12-18 20:56:18,622 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-12-18 20:56:18,722 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 20:56:18,722 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 20:56:18,856 WARN L838 $PredicateComparison]: unable to prove that (and (forall ((v_ArrVal_2105 (Array (_ BitVec 32) (_ BitVec 32)))) (= (select (select (store |c_#memory_$Pointer$.base| c_append_~node~0.base v_ArrVal_2105) c_append_~head.base) (bvadd c_append_~head.offset (_ bv4 32))) (_ bv0 32))) (forall ((v_ArrVal_2104 (Array (_ BitVec 32) (_ BitVec 32)))) (= (select (select (store |c_#memory_$Pointer$.offset| c_append_~node~0.base v_ArrVal_2104) c_append_~head.base) (bvadd c_append_~head.offset (_ bv4 32))) (_ bv0 32)))) is different from false [2021-12-18 20:56:19,125 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_append_~node~0.base_84 (_ BitVec 32))) (or (and (forall ((v_ArrVal_2105 (Array (_ BitVec 32) (_ BitVec 32)))) (= (select (select (store |c_#memory_$Pointer$.base| v_append_~node~0.base_84 v_ArrVal_2105) |c_ULTIMATE.start_main_~list2~0#1.base|) (bvadd |c_ULTIMATE.start_main_~list2~0#1.offset| (_ bv4 32))) (_ bv0 32))) (forall ((v_ArrVal_2104 (Array (_ BitVec 32) (_ BitVec 32)))) (= (select (select (store |c_#memory_$Pointer$.offset| v_append_~node~0.base_84 v_ArrVal_2104) |c_ULTIMATE.start_main_~list2~0#1.base|) (bvadd |c_ULTIMATE.start_main_~list2~0#1.offset| (_ bv4 32))) (_ bv0 32)))) (not (= (_ bv0 1) (select |c_#valid| v_append_~node~0.base_84))))) is different from false [2021-12-18 20:56:21,891 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-18 20:56:21,891 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [564421117] [2021-12-18 20:56:21,891 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [564421117] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 20:56:21,891 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1959815831] [2021-12-18 20:56:21,891 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:56:21,891 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-18 20:56:21,892 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2021-12-18 20:56:21,892 INFO L229 MonitoredProcess]: Starting monitored process 35 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-12-18 20:56:21,893 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (35)] Waiting until timeout for monitored process [2021-12-18 20:56:22,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:56:22,412 INFO L263 TraceCheckSpWp]: Trace formula consists of 289 conjuncts, 67 conjunts are in the unsatisfiable core [2021-12-18 20:56:22,415 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:56:22,430 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:56:22,585 INFO L354 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2021-12-18 20:56:22,586 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 27 [2021-12-18 20:56:22,740 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-12-18 20:56:22,760 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-12-18 20:56:26,202 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:56:26,205 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:56:26,206 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 23 [2021-12-18 20:56:26,219 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:56:26,222 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:56:26,223 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 23 [2021-12-18 20:56:26,287 INFO L354 Elim1Store]: treesize reduction 30, result has 45.5 percent of original size [2021-12-18 20:56:26,287 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 29 treesize of output 46 [2021-12-18 20:56:26,973 INFO L354 Elim1Store]: treesize reduction 12, result has 52.0 percent of original size [2021-12-18 20:56:26,974 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 33 treesize of output 37 [2021-12-18 20:56:27,111 INFO L388 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 [2021-12-18 20:56:27,123 INFO L388 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 [2021-12-18 20:56:29,574 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 20:56:29,574 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 20:57:10,665 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1959815831] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 20:57:10,665 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-18 20:57:10,665 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 32 [2021-12-18 20:57:10,666 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1968615201] [2021-12-18 20:57:10,666 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-18 20:57:10,666 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-12-18 20:57:10,666 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-18 20:57:10,666 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-12-18 20:57:10,667 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=1194, Unknown=84, NotChecked=222, Total=1640 [2021-12-18 20:57:10,667 INFO L87 Difference]: Start difference. First operand 175 states and 192 transitions. Second operand has 32 states, 32 states have (on average 2.21875) internal successors, (71), 29 states have internal predecessors, (71), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-18 20:57:11,848 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:57:11,848 INFO L93 Difference]: Finished difference Result 209 states and 227 transitions. [2021-12-18 20:57:11,849 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-12-18 20:57:11,849 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 2.21875) internal successors, (71), 29 states have internal predecessors, (71), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 42 [2021-12-18 20:57:11,849 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:57:11,850 INFO L225 Difference]: With dead ends: 209 [2021-12-18 20:57:11,850 INFO L226 Difference]: Without dead ends: 209 [2021-12-18 20:57:11,851 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 80 SyntacticMatches, 2 SemanticMatches, 40 ConstructedPredicates, 3 IntricatePredicates, 0 DeprecatedPredicates, 398 ImplicationChecksByTransitivity, 49.4s TimeCoverageRelationStatistics Valid=151, Invalid=1259, Unknown=84, NotChecked=228, Total=1722 [2021-12-18 20:57:11,851 INFO L933 BasicCegarLoop]: 81 mSDtfsCounter, 49 mSDsluCounter, 1111 mSDsCounter, 0 mSdLazyCounter, 369 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 1192 SdHoareTripleChecker+Invalid, 1015 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 369 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 633 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-12-18 20:57:11,852 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [49 Valid, 1192 Invalid, 1015 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 369 Invalid, 0 Unknown, 633 Unchecked, 1.0s Time] [2021-12-18 20:57:11,852 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209 states. [2021-12-18 20:57:11,855 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 209 to 177. [2021-12-18 20:57:11,855 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 177 states, 137 states have (on average 1.2992700729927007) internal successors, (178), 165 states have internal predecessors, (178), 7 states have call successors, (7), 6 states have call predecessors, (7), 4 states have return successors, (9), 5 states have call predecessors, (9), 7 states have call successors, (9) [2021-12-18 20:57:11,856 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 177 states to 177 states and 194 transitions. [2021-12-18 20:57:11,856 INFO L78 Accepts]: Start accepts. Automaton has 177 states and 194 transitions. Word has length 42 [2021-12-18 20:57:11,856 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:57:11,856 INFO L470 AbstractCegarLoop]: Abstraction has 177 states and 194 transitions. [2021-12-18 20:57:11,857 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 2.21875) internal successors, (71), 29 states have internal predecessors, (71), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-18 20:57:11,857 INFO L276 IsEmpty]: Start isEmpty. Operand 177 states and 194 transitions. [2021-12-18 20:57:11,857 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-12-18 20:57:11,857 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:57:11,858 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 20:57:11,873 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (34)] Forceful destruction successful, exit code 0 [2021-12-18 20:57:12,079 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (35)] Forceful destruction successful, exit code 0 [2021-12-18 20:57:12,270 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3,35 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt [2021-12-18 20:57:12,271 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 55 more)] === [2021-12-18 20:57:12,271 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:57:12,271 INFO L85 PathProgramCache]: Analyzing trace with hash 1438452656, now seen corresponding path program 1 times [2021-12-18 20:57:12,271 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-18 20:57:12,271 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [552646570] [2021-12-18 20:57:12,271 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:57:12,272 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-18 20:57:12,272 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-18 20:57:12,272 INFO L229 MonitoredProcess]: Starting monitored process 36 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-18 20:57:12,273 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (36)] Waiting until timeout for monitored process [2021-12-18 20:57:12,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:57:12,520 INFO L263 TraceCheckSpWp]: Trace formula consists of 306 conjuncts, 3 conjunts are in the unsatisfiable core [2021-12-18 20:57:12,521 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:57:12,604 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-12-18 20:57:12,604 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 20:57:12,679 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-12-18 20:57:12,679 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-18 20:57:12,679 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [552646570] [2021-12-18 20:57:12,679 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [552646570] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-18 20:57:12,679 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-18 20:57:12,679 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 6 [2021-12-18 20:57:12,679 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1955260887] [2021-12-18 20:57:12,679 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-18 20:57:12,679 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-12-18 20:57:12,679 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-18 20:57:12,680 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-12-18 20:57:12,680 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-12-18 20:57:12,680 INFO L87 Difference]: Start difference. First operand 177 states and 194 transitions. Second operand has 6 states, 6 states have (on average 5.333333333333333) internal successors, (32), 6 states have internal predecessors, (32), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-12-18 20:57:12,773 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:57:12,774 INFO L93 Difference]: Finished difference Result 222 states and 242 transitions. [2021-12-18 20:57:12,774 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-18 20:57:12,774 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 5.333333333333333) internal successors, (32), 6 states have internal predecessors, (32), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 45 [2021-12-18 20:57:12,774 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:57:12,775 INFO L225 Difference]: With dead ends: 222 [2021-12-18 20:57:12,775 INFO L226 Difference]: Without dead ends: 222 [2021-12-18 20:57:12,775 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 84 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=23, Unknown=0, NotChecked=0, Total=42 [2021-12-18 20:57:12,776 INFO L933 BasicCegarLoop]: 111 mSDtfsCounter, 82 mSDsluCounter, 276 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 84 SdHoareTripleChecker+Valid, 387 SdHoareTripleChecker+Invalid, 59 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-18 20:57:12,776 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [84 Valid, 387 Invalid, 59 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-18 20:57:12,777 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 222 states. [2021-12-18 20:57:12,780 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 222 to 207. [2021-12-18 20:57:12,780 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 207 states, 164 states have (on average 1.3414634146341464) internal successors, (220), 192 states have internal predecessors, (220), 10 states have call successors, (10), 6 states have call predecessors, (10), 4 states have return successors, (12), 8 states have call predecessors, (12), 10 states have call successors, (12) [2021-12-18 20:57:12,781 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 207 states to 207 states and 242 transitions. [2021-12-18 20:57:12,781 INFO L78 Accepts]: Start accepts. Automaton has 207 states and 242 transitions. Word has length 45 [2021-12-18 20:57:12,781 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:57:12,782 INFO L470 AbstractCegarLoop]: Abstraction has 207 states and 242 transitions. [2021-12-18 20:57:12,782 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 5.333333333333333) internal successors, (32), 6 states have internal predecessors, (32), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-12-18 20:57:12,782 INFO L276 IsEmpty]: Start isEmpty. Operand 207 states and 242 transitions. [2021-12-18 20:57:12,782 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-12-18 20:57:12,782 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:57:12,782 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 20:57:12,791 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (36)] Forceful destruction successful, exit code 0 [2021-12-18 20:57:12,987 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-18 20:57:12,987 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting appendErr2REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 55 more)] === [2021-12-18 20:57:12,988 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:57:12,988 INFO L85 PathProgramCache]: Analyzing trace with hash 2060295117, now seen corresponding path program 1 times [2021-12-18 20:57:12,988 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-18 20:57:12,988 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1268642701] [2021-12-18 20:57:12,988 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:57:12,988 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-18 20:57:12,988 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-18 20:57:12,989 INFO L229 MonitoredProcess]: Starting monitored process 37 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-18 20:57:12,994 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (37)] Waiting until timeout for monitored process [2021-12-18 20:57:13,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:57:13,275 INFO L263 TraceCheckSpWp]: Trace formula consists of 344 conjuncts, 11 conjunts are in the unsatisfiable core [2021-12-18 20:57:13,280 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:57:13,319 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:57:13,448 INFO L354 Elim1Store]: treesize reduction 12, result has 40.0 percent of original size [2021-12-18 20:57:13,448 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 14 treesize of output 19 [2021-12-18 20:57:13,479 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 19 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-18 20:57:13,479 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 20:57:13,705 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 19 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-18 20:57:13,706 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-18 20:57:13,706 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1268642701] [2021-12-18 20:57:13,706 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1268642701] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-18 20:57:13,706 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-18 20:57:13,706 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2021-12-18 20:57:13,711 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [136285889] [2021-12-18 20:57:13,711 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-18 20:57:13,711 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-12-18 20:57:13,712 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-18 20:57:13,712 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-12-18 20:57:13,712 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-12-18 20:57:13,712 INFO L87 Difference]: Start difference. First operand 207 states and 242 transitions. Second operand has 7 states, 6 states have (on average 7.666666666666667) internal successors, (46), 7 states have internal predecessors, (46), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-12-18 20:57:14,279 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:57:14,279 INFO L93 Difference]: Finished difference Result 229 states and 260 transitions. [2021-12-18 20:57:14,279 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-18 20:57:14,279 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 7.666666666666667) internal successors, (46), 7 states have internal predecessors, (46), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 48 [2021-12-18 20:57:14,280 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:57:14,280 INFO L225 Difference]: With dead ends: 229 [2021-12-18 20:57:14,280 INFO L226 Difference]: Without dead ends: 229 [2021-12-18 20:57:14,280 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 88 SyntacticMatches, 2 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-12-18 20:57:14,281 INFO L933 BasicCegarLoop]: 66 mSDtfsCounter, 110 mSDsluCounter, 170 mSDsCounter, 0 mSdLazyCounter, 192 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 110 SdHoareTripleChecker+Valid, 236 SdHoareTripleChecker+Invalid, 198 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 192 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-12-18 20:57:14,281 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [110 Valid, 236 Invalid, 198 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 192 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-12-18 20:57:14,282 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 229 states. [2021-12-18 20:57:14,285 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 229 to 212. [2021-12-18 20:57:14,285 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 212 states, 169 states have (on average 1.349112426035503) internal successors, (228), 196 states have internal predecessors, (228), 10 states have call successors, (10), 7 states have call predecessors, (10), 4 states have return successors, (12), 8 states have call predecessors, (12), 10 states have call successors, (12) [2021-12-18 20:57:14,286 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 212 states to 212 states and 250 transitions. [2021-12-18 20:57:14,286 INFO L78 Accepts]: Start accepts. Automaton has 212 states and 250 transitions. Word has length 48 [2021-12-18 20:57:14,286 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:57:14,286 INFO L470 AbstractCegarLoop]: Abstraction has 212 states and 250 transitions. [2021-12-18 20:57:14,287 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 7.666666666666667) internal successors, (46), 7 states have internal predecessors, (46), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-12-18 20:57:14,287 INFO L276 IsEmpty]: Start isEmpty. Operand 212 states and 250 transitions. [2021-12-18 20:57:14,287 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-12-18 20:57:14,287 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:57:14,287 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 20:57:14,300 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (37)] Ended with exit code 0 [2021-12-18 20:57:14,500 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-18 20:57:14,500 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting appendErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 55 more)] === [2021-12-18 20:57:14,500 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:57:14,500 INFO L85 PathProgramCache]: Analyzing trace with hash 2060295118, now seen corresponding path program 1 times [2021-12-18 20:57:14,501 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-18 20:57:14,501 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2108875908] [2021-12-18 20:57:14,501 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:57:14,501 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-18 20:57:14,501 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-18 20:57:14,502 INFO L229 MonitoredProcess]: Starting monitored process 38 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-18 20:57:14,503 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (38)] Waiting until timeout for monitored process [2021-12-18 20:57:14,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:57:14,814 INFO L263 TraceCheckSpWp]: Trace formula consists of 344 conjuncts, 19 conjunts are in the unsatisfiable core [2021-12-18 20:57:14,816 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:57:14,878 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:57:15,228 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:57:15,228 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 16 [2021-12-18 20:57:15,242 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-18 20:57:15,242 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 13 [2021-12-18 20:57:15,291 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 19 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-18 20:57:15,292 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 20:57:15,965 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-18 20:57:15,967 INFO L388 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 53 treesize of output 49 [2021-12-18 20:57:16,062 INFO L354 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2021-12-18 20:57:16,063 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 15 treesize of output 14 [2021-12-18 20:57:17,148 INFO L354 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2021-12-18 20:57:17,148 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 15 treesize of output 14 [2021-12-18 20:57:17,392 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-18 20:57:17,396 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 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 46 treesize of output 42 [2021-12-18 20:57:17,562 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 17 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-18 20:57:17,562 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-18 20:57:17,562 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2108875908] [2021-12-18 20:57:17,562 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2108875908] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-18 20:57:17,562 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-18 20:57:17,562 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 15 [2021-12-18 20:57:17,562 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1012030077] [2021-12-18 20:57:17,563 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-18 20:57:17,563 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-12-18 20:57:17,563 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-18 20:57:17,563 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-12-18 20:57:17,564 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=193, Unknown=0, NotChecked=0, Total=240 [2021-12-18 20:57:17,564 INFO L87 Difference]: Start difference. First operand 212 states and 250 transitions. Second operand has 16 states, 15 states have (on average 4.6) internal successors, (69), 14 states have internal predecessors, (69), 4 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-12-18 20:57:19,360 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:57:19,360 INFO L93 Difference]: Finished difference Result 264 states and 310 transitions. [2021-12-18 20:57:19,361 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-12-18 20:57:19,361 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 4.6) internal successors, (69), 14 states have internal predecessors, (69), 4 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) Word has length 48 [2021-12-18 20:57:19,362 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:57:19,363 INFO L225 Difference]: With dead ends: 264 [2021-12-18 20:57:19,363 INFO L226 Difference]: Without dead ends: 264 [2021-12-18 20:57:19,363 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 81 SyntacticMatches, 4 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=91, Invalid=289, Unknown=0, NotChecked=0, Total=380 [2021-12-18 20:57:19,364 INFO L933 BasicCegarLoop]: 73 mSDtfsCounter, 225 mSDsluCounter, 366 mSDsCounter, 0 mSdLazyCounter, 268 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 227 SdHoareTripleChecker+Valid, 439 SdHoareTripleChecker+Invalid, 440 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 268 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 158 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-12-18 20:57:19,364 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [227 Valid, 439 Invalid, 440 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 268 Invalid, 0 Unknown, 158 Unchecked, 1.1s Time] [2021-12-18 20:57:19,365 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 264 states. [2021-12-18 20:57:19,368 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 264 to 238. [2021-12-18 20:57:19,369 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 238 states, 191 states have (on average 1.3455497382198953) internal successors, (257), 217 states have internal predecessors, (257), 13 states have call successors, (13), 8 states have call predecessors, (13), 5 states have return successors, (22), 12 states have call predecessors, (22), 13 states have call successors, (22) [2021-12-18 20:57:19,370 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 238 states to 238 states and 292 transitions. [2021-12-18 20:57:19,370 INFO L78 Accepts]: Start accepts. Automaton has 238 states and 292 transitions. Word has length 48 [2021-12-18 20:57:19,370 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:57:19,370 INFO L470 AbstractCegarLoop]: Abstraction has 238 states and 292 transitions. [2021-12-18 20:57:19,371 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 15 states have (on average 4.6) internal successors, (69), 14 states have internal predecessors, (69), 4 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-12-18 20:57:19,371 INFO L276 IsEmpty]: Start isEmpty. Operand 238 states and 292 transitions. [2021-12-18 20:57:19,371 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-12-18 20:57:19,371 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:57:19,371 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 20:57:19,384 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (38)] Ended with exit code 0 [2021-12-18 20:57:19,583 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-18 20:57:19,583 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting appendErr2REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 55 more)] === [2021-12-18 20:57:19,584 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:57:19,584 INFO L85 PathProgramCache]: Analyzing trace with hash -625606097, now seen corresponding path program 1 times [2021-12-18 20:57:19,584 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-18 20:57:19,584 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [987245948] [2021-12-18 20:57:19,584 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:57:19,584 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-18 20:57:19,584 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-18 20:57:19,585 INFO L229 MonitoredProcess]: Starting monitored process 39 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-18 20:57:19,586 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (39)] Waiting until timeout for monitored process [2021-12-18 20:57:20,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:57:20,038 INFO L263 TraceCheckSpWp]: Trace formula consists of 350 conjuncts, 18 conjunts are in the unsatisfiable core [2021-12-18 20:57:20,039 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:57:20,050 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:57:20,355 INFO L354 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2021-12-18 20:57:20,355 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 27 [2021-12-18 20:57:20,580 INFO L354 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2021-12-18 20:57:20,581 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 27 [2021-12-18 20:57:20,638 INFO L354 Elim1Store]: treesize reduction 12, result has 40.0 percent of original size [2021-12-18 20:57:20,639 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 15 treesize of output 20 [2021-12-18 20:57:20,675 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-12-18 20:57:20,675 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 20:57:23,382 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-12-18 20:57:23,382 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-18 20:57:23,382 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [987245948] [2021-12-18 20:57:23,382 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [987245948] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-18 20:57:23,382 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-18 20:57:23,382 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 5] total 8 [2021-12-18 20:57:23,382 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1859158831] [2021-12-18 20:57:23,382 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-18 20:57:23,382 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-12-18 20:57:23,383 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-18 20:57:23,383 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-12-18 20:57:23,383 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-12-18 20:57:23,383 INFO L87 Difference]: Start difference. First operand 238 states and 292 transitions. Second operand has 9 states, 8 states have (on average 8.25) internal successors, (66), 7 states have internal predecessors, (66), 1 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-12-18 20:57:23,742 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:57:23,743 INFO L93 Difference]: Finished difference Result 263 states and 322 transitions. [2021-12-18 20:57:23,743 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-12-18 20:57:23,743 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 8.25) internal successors, (66), 7 states have internal predecessors, (66), 1 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 50 [2021-12-18 20:57:23,743 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:57:23,745 INFO L225 Difference]: With dead ends: 263 [2021-12-18 20:57:23,746 INFO L226 Difference]: Without dead ends: 263 [2021-12-18 20:57:23,746 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 101 GetRequests, 81 SyntacticMatches, 10 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=38, Invalid=94, Unknown=0, NotChecked=0, Total=132 [2021-12-18 20:57:23,746 INFO L933 BasicCegarLoop]: 75 mSDtfsCounter, 27 mSDsluCounter, 284 mSDsCounter, 0 mSdLazyCounter, 131 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 359 SdHoareTripleChecker+Invalid, 233 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 131 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 98 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-18 20:57:23,747 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 359 Invalid, 233 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 131 Invalid, 0 Unknown, 98 Unchecked, 0.3s Time] [2021-12-18 20:57:23,747 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 263 states. [2021-12-18 20:57:23,753 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 263 to 244. [2021-12-18 20:57:23,753 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 244 states, 197 states have (on average 1.3350253807106598) internal successors, (263), 224 states have internal predecessors, (263), 13 states have call successors, (13), 7 states have call predecessors, (13), 6 states have return successors, (24), 12 states have call predecessors, (24), 13 states have call successors, (24) [2021-12-18 20:57:23,754 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 244 states to 244 states and 300 transitions. [2021-12-18 20:57:23,755 INFO L78 Accepts]: Start accepts. Automaton has 244 states and 300 transitions. Word has length 50 [2021-12-18 20:57:23,755 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:57:23,755 INFO L470 AbstractCegarLoop]: Abstraction has 244 states and 300 transitions. [2021-12-18 20:57:23,755 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 8.25) internal successors, (66), 7 states have internal predecessors, (66), 1 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-12-18 20:57:23,755 INFO L276 IsEmpty]: Start isEmpty. Operand 244 states and 300 transitions. [2021-12-18 20:57:23,756 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-12-18 20:57:23,756 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:57:23,756 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 20:57:23,768 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (39)] Forceful destruction successful, exit code 0 [2021-12-18 20:57:23,967 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-18 20:57:23,967 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting appendErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 55 more)] === [2021-12-18 20:57:23,968 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:57:23,968 INFO L85 PathProgramCache]: Analyzing trace with hash -625606096, now seen corresponding path program 1 times [2021-12-18 20:57:23,968 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-18 20:57:23,968 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [723609767] [2021-12-18 20:57:23,968 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:57:23,968 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-18 20:57:23,968 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-18 20:57:23,969 INFO L229 MonitoredProcess]: Starting monitored process 40 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-18 20:57:23,970 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (40)] Waiting until timeout for monitored process [2021-12-18 20:57:24,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:57:24,355 INFO L263 TraceCheckSpWp]: Trace formula consists of 350 conjuncts, 29 conjunts are in the unsatisfiable core [2021-12-18 20:57:24,357 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:57:24,370 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:57:24,381 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:57:24,846 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:57:24,847 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-18 20:57:24,876 INFO L354 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2021-12-18 20:57:24,876 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 27 [2021-12-18 20:57:25,176 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:57:25,177 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-18 20:57:25,183 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:57:25,185 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 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 14 treesize of output 10 [2021-12-18 20:57:25,398 INFO L354 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2021-12-18 20:57:25,399 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 30 [2021-12-18 20:57:25,530 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-18 20:57:25,530 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 20:57:32,528 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-18 20:57:32,528 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [723609767] [2021-12-18 20:57:32,528 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [723609767] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 20:57:32,528 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1301715542] [2021-12-18 20:57:32,528 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:57:32,528 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-18 20:57:32,528 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2021-12-18 20:57:32,529 INFO L229 MonitoredProcess]: Starting monitored process 41 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-12-18 20:57:32,530 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (41)] Waiting until timeout for monitored process [2021-12-18 20:57:33,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:57:33,188 INFO L263 TraceCheckSpWp]: Trace formula consists of 350 conjuncts, 28 conjunts are in the unsatisfiable core [2021-12-18 20:57:33,190 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:57:33,204 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:57:33,218 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:57:33,644 INFO L354 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2021-12-18 20:57:33,644 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 27 [2021-12-18 20:57:33,650 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-18 20:57:36,045 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:57:36,046 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-18 20:57:36,060 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-18 20:57:36,060 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 14 treesize of output 14 [2021-12-18 20:57:36,309 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-18 20:57:36,310 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 12 treesize of output 18 [2021-12-18 20:57:36,497 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-18 20:57:36,497 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 20:57:43,634 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1301715542] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 20:57:43,634 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-18 20:57:43,634 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 14 [2021-12-18 20:57:43,634 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1064264119] [2021-12-18 20:57:43,634 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-18 20:57:43,634 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-12-18 20:57:43,634 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-18 20:57:43,635 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-12-18 20:57:43,635 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=316, Unknown=4, NotChecked=0, Total=380 [2021-12-18 20:57:43,635 INFO L87 Difference]: Start difference. First operand 244 states and 300 transitions. Second operand has 15 states, 14 states have (on average 4.642857142857143) internal successors, (65), 12 states have internal predecessors, (65), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 1 states have call successors, (3) [2021-12-18 20:57:46,316 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:57:46,316 INFO L93 Difference]: Finished difference Result 291 states and 362 transitions. [2021-12-18 20:57:46,316 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-12-18 20:57:46,316 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 4.642857142857143) internal successors, (65), 12 states have internal predecessors, (65), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 1 states have call successors, (3) Word has length 50 [2021-12-18 20:57:46,317 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:57:46,318 INFO L225 Difference]: With dead ends: 291 [2021-12-18 20:57:46,318 INFO L226 Difference]: Without dead ends: 291 [2021-12-18 20:57:46,318 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 92 SyntacticMatches, 5 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 97 ImplicationChecksByTransitivity, 19.0s TimeCoverageRelationStatistics Valid=101, Invalid=494, Unknown=5, NotChecked=0, Total=600 [2021-12-18 20:57:46,319 INFO L933 BasicCegarLoop]: 91 mSDtfsCounter, 48 mSDsluCounter, 442 mSDsCounter, 0 mSdLazyCounter, 64 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 533 SdHoareTripleChecker+Invalid, 255 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 64 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 188 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-18 20:57:46,319 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [48 Valid, 533 Invalid, 255 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 64 Invalid, 0 Unknown, 188 Unchecked, 0.3s Time] [2021-12-18 20:57:46,319 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 291 states. [2021-12-18 20:57:46,328 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 291 to 278. [2021-12-18 20:57:46,329 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 278 states, 227 states have (on average 1.3127753303964758) internal successors, (298), 255 states have internal predecessors, (298), 15 states have call successors, (15), 9 states have call predecessors, (15), 8 states have return successors, (29), 13 states have call predecessors, (29), 15 states have call successors, (29) [2021-12-18 20:57:46,330 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 278 states to 278 states and 342 transitions. [2021-12-18 20:57:46,330 INFO L78 Accepts]: Start accepts. Automaton has 278 states and 342 transitions. Word has length 50 [2021-12-18 20:57:46,330 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:57:46,330 INFO L470 AbstractCegarLoop]: Abstraction has 278 states and 342 transitions. [2021-12-18 20:57:46,331 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 4.642857142857143) internal successors, (65), 12 states have internal predecessors, (65), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 1 states have call successors, (3) [2021-12-18 20:57:46,331 INFO L276 IsEmpty]: Start isEmpty. Operand 278 states and 342 transitions. [2021-12-18 20:57:46,331 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-12-18 20:57:46,331 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:57:46,331 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 20:57:46,338 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (41)] Ended with exit code 0 [2021-12-18 20:57:46,547 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (40)] Ended with exit code 0 [2021-12-18 20:57:46,738 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt,40 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-18 20:57:46,738 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting appendErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 55 more)] === [2021-12-18 20:57:46,739 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:57:46,739 INFO L85 PathProgramCache]: Analyzing trace with hash -1568037992, now seen corresponding path program 1 times [2021-12-18 20:57:46,739 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-18 20:57:46,739 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1292970505] [2021-12-18 20:57:46,739 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:57:46,739 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-18 20:57:46,739 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-18 20:57:46,740 INFO L229 MonitoredProcess]: Starting monitored process 42 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-18 20:57:46,741 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (42)] Waiting until timeout for monitored process [2021-12-18 20:57:47,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:57:47,126 INFO L263 TraceCheckSpWp]: Trace formula consists of 358 conjuncts, 29 conjunts are in the unsatisfiable core [2021-12-18 20:57:47,128 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:57:47,148 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:57:47,161 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:57:47,603 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:57:47,604 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-18 20:57:47,633 INFO L354 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2021-12-18 20:57:47,634 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 27 [2021-12-18 20:57:47,926 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:57:47,926 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-18 20:57:47,934 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:57:47,935 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 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 14 treesize of output 10 [2021-12-18 20:57:48,146 INFO L354 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2021-12-18 20:57:48,146 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 30 [2021-12-18 20:57:48,383 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 19 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-18 20:57:48,384 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 20:57:53,682 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-18 20:57:53,682 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1292970505] [2021-12-18 20:57:53,682 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1292970505] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 20:57:53,682 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1113963387] [2021-12-18 20:57:53,682 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:57:53,683 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-18 20:57:53,683 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2021-12-18 20:57:53,684 INFO L229 MonitoredProcess]: Starting monitored process 43 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-12-18 20:57:53,688 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (43)] Waiting until timeout for monitored process [2021-12-18 20:57:54,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:57:54,352 INFO L263 TraceCheckSpWp]: Trace formula consists of 358 conjuncts, 28 conjunts are in the unsatisfiable core [2021-12-18 20:57:54,354 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:57:54,378 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:57:54,388 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:57:54,829 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:57:54,830 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-18 20:57:54,858 INFO L354 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2021-12-18 20:57:54,859 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 27 [2021-12-18 20:57:57,242 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:57:57,243 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-18 20:57:57,263 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-18 20:57:57,263 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 14 treesize of output 14 [2021-12-18 20:57:57,492 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-18 20:57:57,492 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 12 treesize of output 18 [2021-12-18 20:57:57,713 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 19 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-18 20:57:57,713 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 20:58:05,206 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1113963387] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 20:58:05,206 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-18 20:58:05,206 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 14 [2021-12-18 20:58:05,206 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [283771481] [2021-12-18 20:58:05,206 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-18 20:58:05,207 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-12-18 20:58:05,207 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-18 20:58:05,207 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-12-18 20:58:05,207 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=315, Unknown=5, NotChecked=0, Total=380 [2021-12-18 20:58:05,208 INFO L87 Difference]: Start difference. First operand 278 states and 342 transitions. Second operand has 15 states, 14 states have (on average 5.071428571428571) internal successors, (71), 12 states have internal predecessors, (71), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 1 states have call successors, (3) [2021-12-18 20:58:08,156 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:58:08,156 INFO L93 Difference]: Finished difference Result 296 states and 369 transitions. [2021-12-18 20:58:08,157 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-12-18 20:58:08,157 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 5.071428571428571) internal successors, (71), 12 states have internal predecessors, (71), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 1 states have call successors, (3) Word has length 53 [2021-12-18 20:58:08,157 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:58:08,158 INFO L225 Difference]: With dead ends: 296 [2021-12-18 20:58:08,158 INFO L226 Difference]: Without dead ends: 296 [2021-12-18 20:58:08,158 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 106 SyntacticMatches, 5 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 94 ImplicationChecksByTransitivity, 17.6s TimeCoverageRelationStatistics Valid=101, Invalid=493, Unknown=6, NotChecked=0, Total=600 [2021-12-18 20:58:08,159 INFO L933 BasicCegarLoop]: 97 mSDtfsCounter, 42 mSDsluCounter, 586 mSDsCounter, 0 mSdLazyCounter, 130 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 683 SdHoareTripleChecker+Invalid, 340 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 130 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 206 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-12-18 20:58:08,159 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [42 Valid, 683 Invalid, 340 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 130 Invalid, 0 Unknown, 206 Unchecked, 0.5s Time] [2021-12-18 20:58:08,160 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 296 states. [2021-12-18 20:58:08,165 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 296 to 280. [2021-12-18 20:58:08,165 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 280 states, 229 states have (on average 1.314410480349345) internal successors, (301), 257 states have internal predecessors, (301), 15 states have call successors, (15), 9 states have call predecessors, (15), 8 states have return successors, (29), 13 states have call predecessors, (29), 15 states have call successors, (29) [2021-12-18 20:58:08,167 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 280 states to 280 states and 345 transitions. [2021-12-18 20:58:08,167 INFO L78 Accepts]: Start accepts. Automaton has 280 states and 345 transitions. Word has length 53 [2021-12-18 20:58:08,167 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:58:08,167 INFO L470 AbstractCegarLoop]: Abstraction has 280 states and 345 transitions. [2021-12-18 20:58:08,167 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 5.071428571428571) internal successors, (71), 12 states have internal predecessors, (71), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 1 states have call successors, (3) [2021-12-18 20:58:08,168 INFO L276 IsEmpty]: Start isEmpty. Operand 280 states and 345 transitions. [2021-12-18 20:58:08,168 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-12-18 20:58:08,168 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:58:08,168 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 20:58:08,176 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (43)] Ended with exit code 0 [2021-12-18 20:58:08,386 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (42)] Ended with exit code 0 [2021-12-18 20:58:08,577 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt,42 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-18 20:58:08,577 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting appendErr15REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 55 more)] === [2021-12-18 20:58:08,577 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:58:08,577 INFO L85 PathProgramCache]: Analyzing trace with hash -1364530950, now seen corresponding path program 1 times [2021-12-18 20:58:08,578 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-18 20:58:08,578 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1534610810] [2021-12-18 20:58:08,578 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:58:08,578 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-18 20:58:08,578 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-18 20:58:08,579 INFO L229 MonitoredProcess]: Starting monitored process 44 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-18 20:58:08,580 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (44)] Waiting until timeout for monitored process [2021-12-18 20:58:08,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:58:08,991 INFO L263 TraceCheckSpWp]: Trace formula consists of 359 conjuncts, 29 conjunts are in the unsatisfiable core [2021-12-18 20:58:08,993 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:58:09,005 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:58:09,013 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:58:09,464 INFO L354 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2021-12-18 20:58:09,465 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 27 [2021-12-18 20:58:09,470 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-18 20:58:09,755 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:58:09,755 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-18 20:58:09,762 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:58:09,763 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 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 14 treesize of output 10 [2021-12-18 20:58:10,042 INFO L354 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2021-12-18 20:58:10,043 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 30 [2021-12-18 20:58:10,329 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-18 20:58:10,330 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 20:58:21,800 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-18 20:58:21,800 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1534610810] [2021-12-18 20:58:21,800 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1534610810] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 20:58:21,800 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1136304727] [2021-12-18 20:58:21,800 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:58:21,800 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-18 20:58:21,800 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2021-12-18 20:58:21,801 INFO L229 MonitoredProcess]: Starting monitored process 45 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-12-18 20:58:21,804 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (45)] Waiting until timeout for monitored process [2021-12-18 20:58:22,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:58:22,577 INFO L263 TraceCheckSpWp]: Trace formula consists of 359 conjuncts, 29 conjunts are in the unsatisfiable core [2021-12-18 20:58:22,579 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:58:22,593 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:58:22,604 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:58:23,039 INFO L354 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2021-12-18 20:58:23,040 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 27 [2021-12-18 20:58:23,046 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-18 20:58:25,496 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-18 20:58:25,497 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-18 20:58:25,516 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-18 20:58:25,516 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 14 treesize of output 14 [2021-12-18 20:58:25,776 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-18 20:58:25,776 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 12 treesize of output 18 [2021-12-18 20:58:26,143 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-18 20:58:26,143 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 20:58:31,925 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1136304727] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 20:58:31,925 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-18 20:58:31,925 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 14 [2021-12-18 20:58:31,925 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [247173309] [2021-12-18 20:58:31,925 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-18 20:58:31,925 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-12-18 20:58:31,925 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-18 20:58:31,926 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-12-18 20:58:31,926 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=425, Unknown=6, NotChecked=0, Total=506 [2021-12-18 20:58:31,926 INFO L87 Difference]: Start difference. First operand 280 states and 345 transitions. Second operand has 15 states, 14 states have (on average 5.214285714285714) internal successors, (73), 12 states have internal predecessors, (73), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 1 states have call successors, (3) [2021-12-18 20:58:32,920 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:58:32,921 INFO L93 Difference]: Finished difference Result 299 states and 370 transitions. [2021-12-18 20:58:32,921 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-12-18 20:58:32,921 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 5.214285714285714) internal successors, (73), 12 states have internal predecessors, (73), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 1 states have call successors, (3) Word has length 54 [2021-12-18 20:58:32,921 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:58:32,922 INFO L225 Difference]: With dead ends: 299 [2021-12-18 20:58:32,922 INFO L226 Difference]: Without dead ends: 299 [2021-12-18 20:58:32,923 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 108 SyntacticMatches, 4 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 131 ImplicationChecksByTransitivity, 19.9s TimeCoverageRelationStatistics Valid=120, Invalid=630, Unknown=6, NotChecked=0, Total=756 [2021-12-18 20:58:32,923 INFO L933 BasicCegarLoop]: 96 mSDtfsCounter, 47 mSDsluCounter, 487 mSDsCounter, 0 mSdLazyCounter, 127 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 583 SdHoareTripleChecker+Invalid, 310 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 127 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 180 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-12-18 20:58:32,924 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [47 Valid, 583 Invalid, 310 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 127 Invalid, 0 Unknown, 180 Unchecked, 0.4s Time] [2021-12-18 20:58:32,924 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 299 states. [2021-12-18 20:58:32,929 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 299 to 279. [2021-12-18 20:58:32,930 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 279 states, 227 states have (on average 1.3127753303964758) internal successors, (298), 257 states have internal predecessors, (298), 15 states have call successors, (15), 8 states have call predecessors, (15), 9 states have return successors, (29), 13 states have call predecessors, (29), 15 states have call successors, (29) [2021-12-18 20:58:32,931 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 279 states to 279 states and 342 transitions. [2021-12-18 20:58:32,931 INFO L78 Accepts]: Start accepts. Automaton has 279 states and 342 transitions. Word has length 54 [2021-12-18 20:58:32,931 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:58:32,931 INFO L470 AbstractCegarLoop]: Abstraction has 279 states and 342 transitions. [2021-12-18 20:58:32,932 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 5.214285714285714) internal successors, (73), 12 states have internal predecessors, (73), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 1 states have call successors, (3) [2021-12-18 20:58:32,932 INFO L276 IsEmpty]: Start isEmpty. Operand 279 states and 342 transitions. [2021-12-18 20:58:32,932 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-12-18 20:58:32,932 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:58:32,933 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 20:58:32,940 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (45)] Ended with exit code 0 [2021-12-18 20:58:33,156 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (44)] Forceful destruction successful, exit code 0 [2021-12-18 20:58:33,346 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt,44 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-18 20:58:33,346 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting appendErr22REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 55 more)] === [2021-12-18 20:58:33,346 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:58:33,346 INFO L85 PathProgramCache]: Analyzing trace with hash -1275453552, now seen corresponding path program 1 times [2021-12-18 20:58:33,347 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-18 20:58:33,347 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [133788473] [2021-12-18 20:58:33,347 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:58:33,347 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-18 20:58:33,347 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-18 20:58:33,348 INFO L229 MonitoredProcess]: Starting monitored process 46 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-18 20:58:33,349 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (46)] Waiting until timeout for monitored process [2021-12-18 20:58:33,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:58:33,838 INFO L263 TraceCheckSpWp]: Trace formula consists of 392 conjuncts, 40 conjunts are in the unsatisfiable core [2021-12-18 20:58:33,848 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:58:33,865 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:58:34,210 INFO L354 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2021-12-18 20:58:34,210 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 27 [2021-12-18 20:58:34,627 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-12-18 20:58:34,719 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-18 20:58:34,719 INFO L388 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 16 treesize of output 22 [2021-12-18 20:58:34,731 INFO L388 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 7 treesize of output 3 [2021-12-18 20:58:34,859 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-18 20:58:34,860 INFO L388 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 20 treesize of output 26 [2021-12-18 20:58:35,140 INFO L354 Elim1Store]: treesize reduction 75, result has 15.7 percent of original size [2021-12-18 20:58:35,140 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 52 [2021-12-18 20:58:35,185 INFO L354 Elim1Store]: treesize reduction 4, result has 71.4 percent of original size [2021-12-18 20:58:35,185 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 26 treesize of output 26 [2021-12-18 20:58:35,392 INFO L354 Elim1Store]: treesize reduction 42, result has 44.0 percent of original size [2021-12-18 20:58:35,393 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 31 treesize of output 52 [2021-12-18 20:58:35,504 INFO L388 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 36 treesize of output 34 [2021-12-18 20:58:35,712 INFO L388 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 36 treesize of output 34 [2021-12-18 20:58:35,790 INFO L388 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 36 treesize of output 34 [2021-12-18 20:58:35,891 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 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 37 treesize of output 21 [2021-12-18 20:58:35,995 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 15 proven. 12 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-18 20:58:35,995 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 20:58:36,099 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_3458 (Array (_ BitVec 32) (_ BitVec 32)))) (= (_ bv0 1) (bvadd (select |c_#valid| (select (select (store |c_#memory_$Pointer$.base| c_append_~node~0.base v_ArrVal_3458) c_append_~head.base) (bvadd c_append_~head.offset (_ bv4 32)))) (_ bv1 1)))) is different from false [2021-12-18 20:58:36,204 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_append_~node~0.base_151 (_ BitVec 32)) (v_ArrVal_3458 (Array (_ BitVec 32) (_ BitVec 32))) (v_ArrVal_3455 (_ BitVec 1))) (or (not (= (_ bv0 1) (bvadd (bvneg v_ArrVal_3455) (_ bv1 1)))) (= (_ bv0 1) (bvadd (select (store |c_#valid| v_append_~node~0.base_151 v_ArrVal_3455) (select (select (store |c_#memory_$Pointer$.base| v_append_~node~0.base_151 v_ArrVal_3458) |c_append_#in~head.base|) (bvadd |c_append_#in~head.offset| (_ bv4 32)))) (_ bv1 1))) (not (= (_ bv0 1) (select |c_#valid| v_append_~node~0.base_151))))) is different from false [2021-12-18 20:58:36,267 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_append_~node~0.base_151 (_ BitVec 32)) (v_ArrVal_3458 (Array (_ BitVec 32) (_ BitVec 32))) (v_ArrVal_3455 (_ BitVec 1))) (or (not (= (_ bv0 1) (bvadd (bvneg v_ArrVal_3455) (_ bv1 1)))) (= (_ bv0 1) (bvadd (select (store |c_#valid| v_append_~node~0.base_151 v_ArrVal_3455) (select (select (store |c_#memory_$Pointer$.base| v_append_~node~0.base_151 v_ArrVal_3458) |c_ULTIMATE.start_main_~list2~0#1.base|) (bvadd |c_ULTIMATE.start_main_~list2~0#1.offset| (_ bv4 32)))) (_ bv1 1))) (not (= (_ bv0 1) (select |c_#valid| v_append_~node~0.base_151))))) is different from false [2021-12-18 20:58:36,573 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-18 20:58:36,573 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 36 [2021-12-18 20:58:36,580 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 180 treesize of output 120 [2021-12-18 20:58:36,586 INFO L388 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 94 treesize of output 86 [2021-12-18 20:58:36,593 INFO L388 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 44 treesize of output 40 [2021-12-18 20:58:38,993 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-18 20:58:38,994 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [133788473] [2021-12-18 20:58:38,994 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [133788473] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 20:58:38,994 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1629841458] [2021-12-18 20:58:38,994 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:58:38,994 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-18 20:58:38,994 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2021-12-18 20:58:38,995 INFO L229 MonitoredProcess]: Starting monitored process 47 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-12-18 20:58:38,996 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (47)] Waiting until timeout for monitored process [2021-12-18 20:58:39,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:58:39,900 INFO L263 TraceCheckSpWp]: Trace formula consists of 392 conjuncts, 38 conjunts are in the unsatisfiable core [2021-12-18 20:58:39,902 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:58:39,935 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:58:40,188 INFO L354 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2021-12-18 20:58:40,188 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 27 [2021-12-18 20:58:40,481 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-12-18 20:58:40,542 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-18 20:58:40,543 INFO L388 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 16 treesize of output 22 [2021-12-18 20:58:40,548 INFO L388 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 7 treesize of output 3 [2021-12-18 20:58:40,626 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-18 20:58:40,626 INFO L388 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 20 treesize of output 26 [2021-12-18 20:58:40,817 INFO L354 Elim1Store]: treesize reduction 75, result has 15.7 percent of original size [2021-12-18 20:58:40,818 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 52 [2021-12-18 20:58:40,863 INFO L354 Elim1Store]: treesize reduction 4, result has 71.4 percent of original size [2021-12-18 20:58:40,863 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 34 treesize of output 32 [2021-12-18 20:58:41,095 INFO L354 Elim1Store]: treesize reduction 42, result has 44.0 percent of original size [2021-12-18 20:58:41,095 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 31 treesize of output 52 [2021-12-18 20:58:41,228 INFO L388 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 36 treesize of output 34 [2021-12-18 20:58:41,490 INFO L388 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 36 treesize of output 34 [2021-12-18 20:58:41,560 INFO L388 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 36 treesize of output 34 [2021-12-18 20:58:41,645 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 17 [2021-12-18 20:58:41,741 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 15 proven. 12 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-18 20:58:41,741 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 20:58:41,983 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_3588 (Array (_ BitVec 32) (_ BitVec 32))) (v_ArrVal_3585 (_ BitVec 1)) (v_append_~node~0.base_155 (_ BitVec 32))) (or (= (_ bv0 1) (bvadd (select (store |c_#valid| v_append_~node~0.base_155 v_ArrVal_3585) (select (select (store |c_#memory_$Pointer$.base| v_append_~node~0.base_155 v_ArrVal_3588) |c_append_#in~head.base|) (bvadd |c_append_#in~head.offset| (_ bv4 32)))) (_ bv1 1))) (not (= (_ bv0 1) (select |c_#valid| v_append_~node~0.base_155))))) is different from false [2021-12-18 20:58:42,009 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_3588 (Array (_ BitVec 32) (_ BitVec 32))) (v_ArrVal_3585 (_ BitVec 1)) (v_append_~node~0.base_155 (_ BitVec 32))) (or (= (_ bv0 1) (bvadd (select (store |c_#valid| v_append_~node~0.base_155 v_ArrVal_3585) (select (select (store |c_#memory_$Pointer$.base| v_append_~node~0.base_155 v_ArrVal_3588) |c_ULTIMATE.start_main_~list2~0#1.base|) (bvadd |c_ULTIMATE.start_main_~list2~0#1.offset| (_ bv4 32)))) (_ bv1 1))) (not (= (_ bv0 1) (select |c_#valid| v_append_~node~0.base_155))))) is different from false [2021-12-18 20:58:42,266 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-18 20:58:42,266 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 36 [2021-12-18 20:58:42,271 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 350 treesize of output 224 [2021-12-18 20:58:42,277 INFO L388 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 198 treesize of output 190 [2021-12-18 20:58:42,283 INFO L388 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 190 treesize of output 174 [2021-12-18 20:58:46,503 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1629841458] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 20:58:46,503 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-18 20:58:46,503 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 17 [2021-12-18 20:58:46,503 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1204120186] [2021-12-18 20:58:46,503 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-18 20:58:46,504 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-12-18 20:58:46,504 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-18 20:58:46,504 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-12-18 20:58:46,504 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=435, Unknown=9, NotChecked=230, Total=756 [2021-12-18 20:58:46,504 INFO L87 Difference]: Start difference. First operand 279 states and 342 transitions. Second operand has 18 states, 17 states have (on average 4.235294117647059) internal successors, (72), 16 states have internal predecessors, (72), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-12-18 20:58:47,594 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 20:58:47,594 INFO L93 Difference]: Finished difference Result 342 states and 414 transitions. [2021-12-18 20:58:47,595 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-12-18 20:58:47,595 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 4.235294117647059) internal successors, (72), 16 states have internal predecessors, (72), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 57 [2021-12-18 20:58:47,595 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 20:58:47,596 INFO L225 Difference]: With dead ends: 342 [2021-12-18 20:58:47,596 INFO L226 Difference]: Without dead ends: 342 [2021-12-18 20:58:47,597 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 111 SyntacticMatches, 10 SemanticMatches, 29 ConstructedPredicates, 5 IntricatePredicates, 0 DeprecatedPredicates, 206 ImplicationChecksByTransitivity, 7.9s TimeCoverageRelationStatistics Valid=109, Invalid=552, Unknown=9, NotChecked=260, Total=930 [2021-12-18 20:58:47,597 INFO L933 BasicCegarLoop]: 116 mSDtfsCounter, 104 mSDsluCounter, 675 mSDsCounter, 0 mSdLazyCounter, 247 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 104 SdHoareTripleChecker+Valid, 791 SdHoareTripleChecker+Invalid, 571 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 247 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 316 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-12-18 20:58:47,597 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [104 Valid, 791 Invalid, 571 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 247 Invalid, 0 Unknown, 316 Unchecked, 0.7s Time] [2021-12-18 20:58:47,598 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 342 states. [2021-12-18 20:58:47,603 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 342 to 302. [2021-12-18 20:58:47,604 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 302 states, 247 states have (on average 1.2995951417004048) internal successors, (321), 275 states have internal predecessors, (321), 18 states have call successors, (18), 9 states have call predecessors, (18), 9 states have return successors, (35), 17 states have call predecessors, (35), 18 states have call successors, (35) [2021-12-18 20:58:47,605 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 302 states to 302 states and 374 transitions. [2021-12-18 20:58:47,605 INFO L78 Accepts]: Start accepts. Automaton has 302 states and 374 transitions. Word has length 57 [2021-12-18 20:58:47,605 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 20:58:47,606 INFO L470 AbstractCegarLoop]: Abstraction has 302 states and 374 transitions. [2021-12-18 20:58:47,606 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 17 states have (on average 4.235294117647059) internal successors, (72), 16 states have internal predecessors, (72), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-12-18 20:58:47,606 INFO L276 IsEmpty]: Start isEmpty. Operand 302 states and 374 transitions. [2021-12-18 20:58:47,606 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-12-18 20:58:47,607 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 20:58:47,607 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 20:58:47,620 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (46)] Ended with exit code 0 [2021-12-18 20:58:47,827 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (47)] Ended with exit code 0 [2021-12-18 20:58:48,020 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3,47 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt [2021-12-18 20:58:48,021 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting appendErr23REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 55 more)] === [2021-12-18 20:58:48,021 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 20:58:48,021 INFO L85 PathProgramCache]: Analyzing trace with hash -1275453551, now seen corresponding path program 1 times [2021-12-18 20:58:48,021 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-18 20:58:48,021 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1654788640] [2021-12-18 20:58:48,021 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 20:58:48,022 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-18 20:58:48,022 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-18 20:58:48,022 INFO L229 MonitoredProcess]: Starting monitored process 48 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-18 20:58:48,024 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (48)] Waiting until timeout for monitored process [2021-12-18 20:58:48,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 20:58:48,518 INFO L263 TraceCheckSpWp]: Trace formula consists of 392 conjuncts, 54 conjunts are in the unsatisfiable core [2021-12-18 20:58:48,521 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 20:58:48,532 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:58:48,808 INFO L354 Elim1Store]: treesize reduction 12, result has 40.0 percent of original size [2021-12-18 20:58:48,808 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 15 treesize of output 20 [2021-12-18 20:58:48,869 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-18 20:58:49,207 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-12-18 20:58:49,223 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-12-18 20:58:49,320 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-18 20:58:49,321 INFO L388 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 16 treesize of output 22 [2021-12-18 20:58:49,326 INFO L388 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 7 treesize of output 3 [2021-12-18 20:58:49,383 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-18 20:58:49,383 INFO L388 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 16 treesize of output 22 [2021-12-18 20:58:49,389 INFO L388 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 7 treesize of output 3 [2021-12-18 20:58:49,533 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-18 20:58:49,533 INFO L388 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 20 treesize of output 26 [2021-12-18 20:58:49,570 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-18 20:58:49,570 INFO L388 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 20 treesize of output 26 [2021-12-18 20:58:49,780 INFO L354 Elim1Store]: treesize reduction 4, result has 71.4 percent of original size [2021-12-18 20:58:49,781 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 53 treesize of output 51 [2021-12-18 20:58:50,033 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-18 20:58:50,033 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 13 [2021-12-18 20:58:50,063 INFO L354 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2021-12-18 20:58:50,063 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 16 treesize of output 18 [2021-12-18 20:58:50,176 INFO L388 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 24 treesize of output 24 [2021-12-18 20:58:50,192 INFO L388 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 [2021-12-18 20:58:50,384 INFO L388 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 [2021-12-18 20:58:50,394 INFO L388 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 24 treesize of output 24 [2021-12-18 20:58:50,459 INFO L388 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 24 treesize of output 24 [2021-12-18 20:58:50,465 INFO L388 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 [2021-12-18 20:58:50,582 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 13 [2021-12-18 20:58:50,587 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 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 15 treesize of output 7 [2021-12-18 20:58:50,647 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 2 proven. 25 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-18 20:58:50,647 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 20:58:50,932 WARN L838 $PredicateComparison]: unable to prove that (and (forall ((v_ArrVal_3725 (Array (_ BitVec 32) (_ BitVec 32)))) (let ((.cse0 (select (select (store |c_#memory_$Pointer$.offset| c_append_~node~0.base v_ArrVal_3725) c_append_~head.base) (bvadd c_append_~head.offset (_ bv4 32))))) (bvule (bvadd .cse0 (_ bv5 32)) (bvadd .cse0 (_ bv9 32))))) (forall ((v_ArrVal_3725 (Array (_ BitVec 32) (_ BitVec 32))) (v_ArrVal_3724 (Array (_ BitVec 32) (_ BitVec 32)))) (let ((.cse1 (bvadd c_append_~head.offset (_ bv4 32)))) (bvule (bvadd (select (select (store |c_#memory_$Pointer$.offset| c_append_~node~0.base v_ArrVal_3725) c_append_~head.base) .cse1) (_ bv9 32)) (select |c_#length| (select (select (store |c_#memory_$Pointer$.base| c_append_~node~0.base v_ArrVal_3724) c_append_~head.base) .cse1)))))) is different from false [2021-12-18 20:58:53,163 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_append_~node~0.base_159 (_ BitVec 32))) (or (not (= (_ bv0 1) (select |c_#valid| v_append_~node~0.base_159))) (and (forall ((v_ArrVal_3725 (Array (_ BitVec 32) (_ BitVec 32)))) (let ((.cse0 (select (select (store |c_#memory_$Pointer$.offset| v_append_~node~0.base_159 v_ArrVal_3725) |c_append_#in~head.base|) (bvadd |c_append_#in~head.offset| (_ bv4 32))))) (bvule (bvadd .cse0 (_ bv5 32)) (bvadd .cse0 (_ bv9 32))))) (forall ((v_ArrVal_3725 (Array (_ BitVec 32) (_ BitVec 32))) (v_ArrVal_3724 (Array (_ BitVec 32) (_ BitVec 32)))) (let ((.cse1 (bvadd |c_append_#in~head.offset| (_ bv4 32)))) (bvule (bvadd (select (select (store |c_#memory_$Pointer$.offset| v_append_~node~0.base_159 v_ArrVal_3725) |c_append_#in~head.base|) .cse1) (_ bv9 32)) (select (store |c_#length| v_append_~node~0.base_159 (_ bv9 32)) (select (select (store |c_#memory_$Pointer$.base| v_append_~node~0.base_159 v_ArrVal_3724) |c_append_#in~head.base|) .cse1)))))))) is different from false [2021-12-18 20:58:56,392 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-18 20:58:56,392 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 109 treesize of output 110 [2021-12-18 20:58:56,399 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-18 20:58:56,402 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 153 treesize of output 141 [2021-12-18 20:58:56,419 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-18 20:58:56,419 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 141 treesize of output 111 [2021-12-18 20:58:56,425 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-18 20:58:56,429 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 170 treesize of output 140 [2021-12-18 20:58:56,439 INFO L388 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 198 treesize of output 186 [2021-12-18 20:58:56,447 INFO L388 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 115 treesize of output 91 [2021-12-18 20:58:56,460 INFO L388 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 91 treesize of output 67 [2021-12-18 20:58:56,506 INFO L354 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2021-12-18 20:58:56,507 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 15 treesize of output 14 [2021-12-18 20:58:57,475 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-18 20:58:57,476 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 106 treesize of output 87 [2021-12-18 20:58:57,498 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-18 20:58:57,498 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 87 treesize of output 87 [2021-12-18 20:58:57,536 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-18 20:58:57,536 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 335 treesize of output 332 [2021-12-18 20:58:57,609 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-18 20:58:57,609 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 1099 treesize of output 1036 [2021-12-18 20:58:57,622 INFO L388 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 997 treesize of output 965 [2021-12-18 20:58:57,632 INFO L388 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 965 treesize of output 901 [2021-12-18 20:58:57,643 INFO L388 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 901 treesize of output 869 [2021-12-18 20:58:57,653 INFO L388 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 869 treesize of output 805 [2021-12-18 20:58:57,663 INFO L388 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 805 treesize of output 789 [2021-12-18 20:58:57,678 INFO L388 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 789 treesize of output 757 Killed by 15