./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/array-crafted/zero_sum_const1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version ae007674 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx15G -Xms4m -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/AutomizerReach.xml -i ../sv-benchmarks/c/array-crafted/zero_sum_const1.c -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash be1a0182ecf6c8aa754e6086345670fff3439e7c706169309311fcaa402caa1e --- Real Ultimate output --- This is Ultimate 0.2.2-dev-ae00767 [2021-12-27 21:36:59,925 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-12-27 21:36:59,927 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-12-27 21:36:59,950 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-12-27 21:36:59,950 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-12-27 21:36:59,951 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-12-27 21:36:59,952 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-12-27 21:36:59,954 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-12-27 21:36:59,955 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-12-27 21:36:59,956 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-12-27 21:36:59,957 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-12-27 21:36:59,958 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-12-27 21:36:59,958 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-12-27 21:36:59,959 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-12-27 21:36:59,960 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-12-27 21:36:59,961 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-12-27 21:36:59,962 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-12-27 21:36:59,962 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-12-27 21:36:59,964 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-12-27 21:36:59,965 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-12-27 21:36:59,966 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-12-27 21:36:59,967 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-12-27 21:36:59,968 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-12-27 21:36:59,969 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-12-27 21:36:59,971 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-12-27 21:36:59,971 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-12-27 21:36:59,971 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-12-27 21:36:59,972 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-12-27 21:36:59,973 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-12-27 21:36:59,973 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-12-27 21:36:59,974 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-12-27 21:36:59,974 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-12-27 21:36:59,975 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-12-27 21:36:59,975 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-12-27 21:36:59,976 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-12-27 21:36:59,977 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-12-27 21:36:59,977 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-12-27 21:36:59,977 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-12-27 21:36:59,978 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-12-27 21:36:59,978 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-12-27 21:36:59,979 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-12-27 21:36:59,980 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2021-12-27 21:36:59,999 INFO L113 SettingsManager]: Loading preferences was successful [2021-12-27 21:36:59,999 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-12-27 21:36:59,999 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-12-27 21:37:00,000 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-12-27 21:37:00,000 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-12-27 21:37:00,001 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-12-27 21:37:00,001 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-12-27 21:37:00,002 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-12-27 21:37:00,002 INFO L138 SettingsManager]: * Use SBE=true [2021-12-27 21:37:00,002 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-12-27 21:37:00,002 INFO L138 SettingsManager]: * sizeof long=4 [2021-12-27 21:37:00,002 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-12-27 21:37:00,003 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-12-27 21:37:00,003 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-12-27 21:37:00,003 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-12-27 21:37:00,003 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-12-27 21:37:00,004 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-12-27 21:37:00,004 INFO L138 SettingsManager]: * sizeof long double=12 [2021-12-27 21:37:00,004 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-12-27 21:37:00,004 INFO L138 SettingsManager]: * Use constant arrays=true [2021-12-27 21:37:00,004 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-12-27 21:37:00,004 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-12-27 21:37:00,005 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-12-27 21:37:00,005 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-12-27 21:37:00,005 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-27 21:37:00,005 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-12-27 21:37:00,005 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-12-27 21:37:00,006 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-12-27 21:37:00,006 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-12-27 21:37:00,006 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-12-27 21:37:00,006 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-12-27 21:37:00,006 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-12-27 21:37:00,006 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-12-27 21:37:00,006 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> be1a0182ecf6c8aa754e6086345670fff3439e7c706169309311fcaa402caa1e [2021-12-27 21:37:00,279 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-12-27 21:37:00,293 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-12-27 21:37:00,294 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-12-27 21:37:00,295 INFO L271 PluginConnector]: Initializing CDTParser... [2021-12-27 21:37:00,296 INFO L275 PluginConnector]: CDTParser initialized [2021-12-27 21:37:00,297 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/array-crafted/zero_sum_const1.c [2021-12-27 21:37:00,350 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/af88cacec/daed1702feb948b9b22a2917d92097b2/FLAGb2dbc87ea [2021-12-27 21:37:00,683 INFO L306 CDTParser]: Found 1 translation units. [2021-12-27 21:37:00,683 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-crafted/zero_sum_const1.c [2021-12-27 21:37:00,689 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/af88cacec/daed1702feb948b9b22a2917d92097b2/FLAGb2dbc87ea [2021-12-27 21:37:01,113 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/af88cacec/daed1702feb948b9b22a2917d92097b2 [2021-12-27 21:37:01,115 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-12-27 21:37:01,115 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-12-27 21:37:01,116 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-12-27 21:37:01,117 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-12-27 21:37:01,124 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-12-27 21:37:01,125 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.12 09:37:01" (1/1) ... [2021-12-27 21:37:01,127 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@c941e07 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.12 09:37:01, skipping insertion in model container [2021-12-27 21:37:01,127 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.12 09:37:01" (1/1) ... [2021-12-27 21:37:01,131 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-12-27 21:37:01,139 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-12-27 21:37:01,238 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-crafted/zero_sum_const1.c[406,419] [2021-12-27 21:37:01,247 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-27 21:37:01,252 INFO L203 MainTranslator]: Completed pre-run [2021-12-27 21:37:01,262 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-crafted/zero_sum_const1.c[406,419] [2021-12-27 21:37:01,272 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-27 21:37:01,281 INFO L208 MainTranslator]: Completed translation [2021-12-27 21:37:01,281 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.12 09:37:01 WrapperNode [2021-12-27 21:37:01,281 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-12-27 21:37:01,282 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-12-27 21:37:01,282 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-12-27 21:37:01,282 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-12-27 21:37:01,293 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.12 09:37:01" (1/1) ... [2021-12-27 21:37:01,311 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.12 09:37:01" (1/1) ... [2021-12-27 21:37:01,322 INFO L137 Inliner]: procedures = 16, calls = 12, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 60 [2021-12-27 21:37:01,322 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-12-27 21:37:01,323 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-12-27 21:37:01,323 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-12-27 21:37:01,323 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-12-27 21:37:01,328 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.12 09:37:01" (1/1) ... [2021-12-27 21:37:01,328 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.12 09:37:01" (1/1) ... [2021-12-27 21:37:01,329 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.12 09:37:01" (1/1) ... [2021-12-27 21:37:01,329 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.12 09:37:01" (1/1) ... [2021-12-27 21:37:01,332 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.12 09:37:01" (1/1) ... [2021-12-27 21:37:01,334 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.12 09:37:01" (1/1) ... [2021-12-27 21:37:01,334 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.12 09:37:01" (1/1) ... [2021-12-27 21:37:01,335 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-12-27 21:37:01,336 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-12-27 21:37:01,336 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-12-27 21:37:01,336 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-12-27 21:37:01,337 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.12 09:37:01" (1/1) ... [2021-12-27 21:37:01,341 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-27 21:37:01,348 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-27 21:37:01,357 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-12-27 21:37:01,359 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-12-27 21:37:01,386 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-12-27 21:37:01,386 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-12-27 21:37:01,386 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-12-27 21:37:01,386 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-12-27 21:37:01,387 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-12-27 21:37:01,387 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-12-27 21:37:01,387 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-12-27 21:37:01,427 INFO L234 CfgBuilder]: Building ICFG [2021-12-27 21:37:01,428 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2021-12-27 21:37:01,569 INFO L275 CfgBuilder]: Performing block encoding [2021-12-27 21:37:01,587 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-12-27 21:37:01,587 INFO L299 CfgBuilder]: Removed 3 assume(true) statements. [2021-12-27 21:37:01,588 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.12 09:37:01 BoogieIcfgContainer [2021-12-27 21:37:01,588 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-12-27 21:37:01,590 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-12-27 21:37:01,590 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-12-27 21:37:01,592 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-12-27 21:37:01,592 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 27.12 09:37:01" (1/3) ... [2021-12-27 21:37:01,592 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@24ad871d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.12 09:37:01, skipping insertion in model container [2021-12-27 21:37:01,593 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.12 09:37:01" (2/3) ... [2021-12-27 21:37:01,593 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@24ad871d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.12 09:37:01, skipping insertion in model container [2021-12-27 21:37:01,593 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.12 09:37:01" (3/3) ... [2021-12-27 21:37:01,594 INFO L111 eAbstractionObserver]: Analyzing ICFG zero_sum_const1.c [2021-12-27 21:37:01,597 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-12-27 21:37:01,601 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-12-27 21:37:01,647 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-12-27 21:37:01,652 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-12-27 21:37:01,652 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-12-27 21:37:01,670 INFO L276 IsEmpty]: Start isEmpty. Operand has 20 states, 18 states have (on average 1.5) internal successors, (27), 19 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-27 21:37:01,673 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-12-27 21:37:01,673 INFO L506 BasicCegarLoop]: Found error trace [2021-12-27 21:37:01,674 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-27 21:37:01,674 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-27 21:37:01,677 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-27 21:37:01,678 INFO L85 PathProgramCache]: Analyzing trace with hash -718163050, now seen corresponding path program 1 times [2021-12-27 21:37:01,692 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-27 21:37:01,693 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [911179731] [2021-12-27 21:37:01,693 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-27 21:37:01,693 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-27 21:37:01,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:37:01,807 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-27 21:37:01,807 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-27 21:37:01,808 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [911179731] [2021-12-27 21:37:01,808 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [911179731] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-27 21:37:01,809 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-27 21:37:01,809 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-27 21:37:01,810 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [650597705] [2021-12-27 21:37:01,810 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-27 21:37:01,813 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-12-27 21:37:01,813 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-27 21:37:01,835 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-12-27 21:37:01,836 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-12-27 21:37:01,838 INFO L87 Difference]: Start difference. First operand has 20 states, 18 states have (on average 1.5) internal successors, (27), 19 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 2 states, 2 states have (on average 5.5) internal successors, (11), 2 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-27 21:37:01,848 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-27 21:37:01,848 INFO L93 Difference]: Finished difference Result 35 states and 46 transitions. [2021-12-27 21:37:01,849 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-12-27 21:37:01,850 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 5.5) internal successors, (11), 2 states have internal predecessors, (11), 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 11 [2021-12-27 21:37:01,851 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-27 21:37:01,856 INFO L225 Difference]: With dead ends: 35 [2021-12-27 21:37:01,856 INFO L226 Difference]: Without dead ends: 15 [2021-12-27 21:37:01,859 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-12-27 21:37:01,863 INFO L933 BasicCegarLoop]: 23 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, 23 SdHoareTripleChecker+Invalid, 0 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 0 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-27 21:37:01,864 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 23 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-27 21:37:01,875 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2021-12-27 21:37:01,883 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2021-12-27 21:37:01,884 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 14 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-27 21:37:01,887 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2021-12-27 21:37:01,888 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 11 [2021-12-27 21:37:01,888 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-27 21:37:01,888 INFO L470 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2021-12-27 21:37:01,888 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 5.5) internal successors, (11), 2 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-27 21:37:01,888 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2021-12-27 21:37:01,889 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-12-27 21:37:01,889 INFO L506 BasicCegarLoop]: Found error trace [2021-12-27 21:37:01,889 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-27 21:37:01,889 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-12-27 21:37:01,889 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-27 21:37:01,890 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-27 21:37:01,890 INFO L85 PathProgramCache]: Analyzing trace with hash 1709876828, now seen corresponding path program 1 times [2021-12-27 21:37:01,890 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-27 21:37:01,890 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [5613964] [2021-12-27 21:37:01,890 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-27 21:37:01,890 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-27 21:37:01,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:37:01,948 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-27 21:37:01,948 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-27 21:37:01,948 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [5613964] [2021-12-27 21:37:01,948 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [5613964] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-27 21:37:01,948 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-27 21:37:01,948 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-12-27 21:37:01,949 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [780754871] [2021-12-27 21:37:01,949 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-27 21:37:01,949 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-27 21:37:01,950 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-27 21:37:01,950 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-27 21:37:01,950 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-27 21:37:01,950 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-27 21:37:01,984 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-27 21:37:01,984 INFO L93 Difference]: Finished difference Result 27 states and 31 transitions. [2021-12-27 21:37:01,985 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-27 21:37:01,985 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 3 states have internal predecessors, (11), 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 11 [2021-12-27 21:37:01,985 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-27 21:37:01,985 INFO L225 Difference]: With dead ends: 27 [2021-12-27 21:37:01,985 INFO L226 Difference]: Without dead ends: 17 [2021-12-27 21:37:01,986 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-27 21:37:01,987 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 1 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-27 21:37:01,987 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 18 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 15 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-27 21:37:01,988 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-12-27 21:37:01,989 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 16. [2021-12-27 21:37:01,990 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 15 states have (on average 1.2) internal successors, (18), 15 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-27 21:37:01,990 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2021-12-27 21:37:01,990 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 11 [2021-12-27 21:37:01,990 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-27 21:37:01,991 INFO L470 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2021-12-27 21:37:01,991 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-27 21:37:01,991 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2021-12-27 21:37:01,991 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-12-27 21:37:01,991 INFO L506 BasicCegarLoop]: Found error trace [2021-12-27 21:37:01,991 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-27 21:37:01,992 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-12-27 21:37:01,992 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-27 21:37:01,992 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-27 21:37:01,992 INFO L85 PathProgramCache]: Analyzing trace with hash -2117745282, now seen corresponding path program 1 times [2021-12-27 21:37:01,993 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-27 21:37:01,993 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [333599090] [2021-12-27 21:37:01,993 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-27 21:37:01,993 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-27 21:37:02,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:37:02,041 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-27 21:37:02,041 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-27 21:37:02,041 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [333599090] [2021-12-27 21:37:02,041 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [333599090] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-27 21:37:02,041 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-27 21:37:02,041 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-12-27 21:37:02,042 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1817012066] [2021-12-27 21:37:02,042 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-27 21:37:02,042 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-12-27 21:37:02,042 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-27 21:37:02,042 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-12-27 21:37:02,043 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-12-27 21:37:02,043 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand has 4 states, 4 states have (on average 3.25) internal successors, (13), 4 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-27 21:37:02,094 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-27 21:37:02,095 INFO L93 Difference]: Finished difference Result 28 states and 32 transitions. [2021-12-27 21:37:02,096 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-12-27 21:37:02,096 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.25) internal successors, (13), 4 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2021-12-27 21:37:02,096 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-27 21:37:02,096 INFO L225 Difference]: With dead ends: 28 [2021-12-27 21:37:02,096 INFO L226 Difference]: Without dead ends: 21 [2021-12-27 21:37:02,098 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-12-27 21:37:02,098 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 16 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 20 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 20 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-27 21:37:02,100 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 11 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 20 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-27 21:37:02,101 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-12-27 21:37:02,103 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 18. [2021-12-27 21:37:02,105 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 17 states have (on average 1.1764705882352942) internal successors, (20), 17 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-27 21:37:02,105 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2021-12-27 21:37:02,106 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 13 [2021-12-27 21:37:02,106 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-27 21:37:02,106 INFO L470 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2021-12-27 21:37:02,106 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.25) internal successors, (13), 4 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-27 21:37:02,107 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2021-12-27 21:37:02,108 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-12-27 21:37:02,109 INFO L506 BasicCegarLoop]: Found error trace [2021-12-27 21:37:02,109 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-27 21:37:02,109 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-12-27 21:37:02,109 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-27 21:37:02,110 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-27 21:37:02,110 INFO L85 PathProgramCache]: Analyzing trace with hash -350467326, now seen corresponding path program 1 times [2021-12-27 21:37:02,110 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-27 21:37:02,110 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2039933267] [2021-12-27 21:37:02,111 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-27 21:37:02,111 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-27 21:37:02,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:37:02,178 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-12-27 21:37:02,178 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-27 21:37:02,178 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2039933267] [2021-12-27 21:37:02,178 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2039933267] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-27 21:37:02,179 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [75755149] [2021-12-27 21:37:02,179 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-27 21:37:02,179 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-27 21:37:02,179 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-27 21:37:02,196 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-27 21:37:02,199 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-12-27 21:37:02,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:37:02,253 INFO L263 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 4 conjunts are in the unsatisfiable core [2021-12-27 21:37:02,256 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-27 21:37:02,323 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-12-27 21:37:02,323 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-27 21:37:02,390 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-12-27 21:37:02,391 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [75755149] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-27 21:37:02,391 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-27 21:37:02,391 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2021-12-27 21:37:02,391 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1006886670] [2021-12-27 21:37:02,391 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-27 21:37:02,391 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-12-27 21:37:02,391 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-27 21:37:02,392 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-12-27 21:37:02,392 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=22, Unknown=0, NotChecked=0, Total=42 [2021-12-27 21:37:02,392 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand has 7 states, 7 states have (on average 3.4285714285714284) internal successors, (24), 7 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-27 21:37:02,426 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-27 21:37:02,426 INFO L93 Difference]: Finished difference Result 33 states and 37 transitions. [2021-12-27 21:37:02,426 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-12-27 21:37:02,427 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.4285714285714284) internal successors, (24), 7 states have internal predecessors, (24), 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 17 [2021-12-27 21:37:02,427 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-27 21:37:02,427 INFO L225 Difference]: With dead ends: 33 [2021-12-27 21:37:02,428 INFO L226 Difference]: Without dead ends: 21 [2021-12-27 21:37:02,428 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 30 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=20, Invalid=22, Unknown=0, NotChecked=0, Total=42 [2021-12-27 21:37:02,434 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 2 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 22 SdHoareTripleChecker+Invalid, 44 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-27 21:37:02,436 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 22 Invalid, 44 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 40 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-27 21:37:02,436 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-12-27 21:37:02,439 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 20. [2021-12-27 21:37:02,439 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 19 states have (on average 1.1578947368421053) internal successors, (22), 19 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-27 21:37:02,439 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2021-12-27 21:37:02,439 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 17 [2021-12-27 21:37:02,440 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-27 21:37:02,440 INFO L470 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2021-12-27 21:37:02,440 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.4285714285714284) internal successors, (24), 7 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-27 21:37:02,440 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2021-12-27 21:37:02,440 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-12-27 21:37:02,441 INFO L506 BasicCegarLoop]: Found error trace [2021-12-27 21:37:02,441 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-27 21:37:02,459 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-12-27 21:37:02,649 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-27 21:37:02,650 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-27 21:37:02,650 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-27 21:37:02,651 INFO L85 PathProgramCache]: Analyzing trace with hash 1584924836, now seen corresponding path program 2 times [2021-12-27 21:37:02,651 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-27 21:37:02,652 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [150593871] [2021-12-27 21:37:02,652 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-27 21:37:02,653 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-27 21:37:02,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:37:02,704 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-12-27 21:37:02,704 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-27 21:37:02,704 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [150593871] [2021-12-27 21:37:02,705 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [150593871] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-27 21:37:02,705 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [638194447] [2021-12-27 21:37:02,705 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-27 21:37:02,705 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-27 21:37:02,705 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-27 21:37:02,706 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-27 21:37:02,707 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-12-27 21:37:02,747 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-27 21:37:02,748 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-27 21:37:02,749 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 4 conjunts are in the unsatisfiable core [2021-12-27 21:37:02,750 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-27 21:37:02,806 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-12-27 21:37:02,806 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-27 21:37:02,864 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-12-27 21:37:02,864 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [638194447] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-27 21:37:02,864 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-27 21:37:02,864 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2021-12-27 21:37:02,865 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [727387539] [2021-12-27 21:37:02,865 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-27 21:37:02,866 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-12-27 21:37:02,866 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-27 21:37:02,871 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-12-27 21:37:02,872 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=31, Unknown=0, NotChecked=0, Total=56 [2021-12-27 21:37:02,872 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand has 8 states, 8 states have (on average 3.0) internal successors, (24), 8 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-27 21:37:02,923 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-27 21:37:02,923 INFO L93 Difference]: Finished difference Result 35 states and 39 transitions. [2021-12-27 21:37:02,923 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-27 21:37:02,923 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.0) internal successors, (24), 8 states have internal predecessors, (24), 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 19 [2021-12-27 21:37:02,924 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-27 21:37:02,925 INFO L225 Difference]: With dead ends: 35 [2021-12-27 21:37:02,925 INFO L226 Difference]: Without dead ends: 27 [2021-12-27 21:37:02,926 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 33 SyntacticMatches, 2 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=32, Invalid=40, Unknown=0, NotChecked=0, Total=72 [2021-12-27 21:37:02,928 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 17 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 59 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-27 21:37:02,928 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [17 Valid, 17 Invalid, 59 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-27 21:37:02,930 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-12-27 21:37:02,935 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 24. [2021-12-27 21:37:02,935 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 23 states have (on average 1.1304347826086956) internal successors, (26), 23 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-27 21:37:02,936 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2021-12-27 21:37:02,936 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 19 [2021-12-27 21:37:02,936 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-27 21:37:02,936 INFO L470 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2021-12-27 21:37:02,937 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 3.0) internal successors, (24), 8 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-27 21:37:02,937 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2021-12-27 21:37:02,938 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-12-27 21:37:02,938 INFO L506 BasicCegarLoop]: Found error trace [2021-12-27 21:37:02,938 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-27 21:37:02,954 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2021-12-27 21:37:03,151 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-27 21:37:03,152 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-27 21:37:03,152 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-27 21:37:03,152 INFO L85 PathProgramCache]: Analyzing trace with hash 1965660968, now seen corresponding path program 3 times [2021-12-27 21:37:03,152 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-27 21:37:03,152 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [369760151] [2021-12-27 21:37:03,152 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-27 21:37:03,152 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-27 21:37:03,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:37:03,527 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-27 21:37:03,527 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-27 21:37:03,528 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [369760151] [2021-12-27 21:37:03,528 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [369760151] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-27 21:37:03,528 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [517932102] [2021-12-27 21:37:03,528 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-27 21:37:03,528 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-27 21:37:03,528 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-27 21:37:03,532 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-27 21:37:03,533 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-12-27 21:37:03,571 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-12-27 21:37:03,572 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-27 21:37:03,573 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 30 conjunts are in the unsatisfiable core [2021-12-27 21:37:03,575 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-27 21:37:04,159 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-27 21:37:04,159 INFO L387 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 17 treesize of output 18 [2021-12-27 21:37:04,334 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-27 21:37:04,335 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-27 21:37:05,083 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-27 21:37:05,084 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 74 treesize of output 103 [2021-12-27 21:37:05,941 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-27 21:37:05,942 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [517932102] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-27 21:37:05,942 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-27 21:37:05,942 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 19, 19] total 47 [2021-12-27 21:37:05,942 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1859927585] [2021-12-27 21:37:05,942 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-27 21:37:05,943 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2021-12-27 21:37:05,943 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-27 21:37:05,944 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-12-27 21:37:05,945 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=257, Invalid=1905, Unknown=0, NotChecked=0, Total=2162 [2021-12-27 21:37:05,945 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand has 47 states, 47 states have (on average 1.297872340425532) internal successors, (61), 47 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-27 21:37:07,206 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-27 21:37:07,207 INFO L93 Difference]: Finished difference Result 54 states and 60 transitions. [2021-12-27 21:37:07,207 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-12-27 21:37:07,207 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 1.297872340425532) internal successors, (61), 47 states have internal predecessors, (61), 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 23 [2021-12-27 21:37:07,207 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-27 21:37:07,209 INFO L225 Difference]: With dead ends: 54 [2021-12-27 21:37:07,209 INFO L226 Difference]: Without dead ends: 48 [2021-12-27 21:37:07,210 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1369 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=649, Invalid=4901, Unknown=0, NotChecked=0, Total=5550 [2021-12-27 21:37:07,211 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 42 mSDsluCounter, 58 mSDsCounter, 0 mSdLazyCounter, 291 mSolverCounterSat, 53 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 65 SdHoareTripleChecker+Invalid, 498 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 53 IncrementalHoareTripleChecker+Valid, 291 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 154 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-27 21:37:07,211 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [42 Valid, 65 Invalid, 498 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [53 Valid, 291 Invalid, 0 Unknown, 154 Unchecked, 0.2s Time] [2021-12-27 21:37:07,211 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-12-27 21:37:07,215 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 29. [2021-12-27 21:37:07,215 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 28 states have (on average 1.1428571428571428) internal successors, (32), 28 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-27 21:37:07,216 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 32 transitions. [2021-12-27 21:37:07,216 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 32 transitions. Word has length 23 [2021-12-27 21:37:07,216 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-27 21:37:07,216 INFO L470 AbstractCegarLoop]: Abstraction has 29 states and 32 transitions. [2021-12-27 21:37:07,216 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 47 states have (on average 1.297872340425532) internal successors, (61), 47 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-27 21:37:07,216 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 32 transitions. [2021-12-27 21:37:07,216 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-12-27 21:37:07,217 INFO L506 BasicCegarLoop]: Found error trace [2021-12-27 21:37:07,217 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-27 21:37:07,236 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-12-27 21:37:07,417 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-27 21:37:07,417 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-27 21:37:07,418 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-27 21:37:07,418 INFO L85 PathProgramCache]: Analyzing trace with hash -732186678, now seen corresponding path program 4 times [2021-12-27 21:37:07,418 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-27 21:37:07,418 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1044051080] [2021-12-27 21:37:07,418 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-27 21:37:07,418 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-27 21:37:07,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:37:07,471 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 6 proven. 7 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-12-27 21:37:07,471 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-27 21:37:07,471 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1044051080] [2021-12-27 21:37:07,472 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1044051080] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-27 21:37:07,472 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [957126704] [2021-12-27 21:37:07,472 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-27 21:37:07,472 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-27 21:37:07,472 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-27 21:37:07,473 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-27 21:37:07,474 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-12-27 21:37:07,507 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-27 21:37:07,508 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-27 21:37:07,508 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 8 conjunts are in the unsatisfiable core [2021-12-27 21:37:07,509 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-27 21:37:07,594 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-12-27 21:37:07,594 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-27 21:37:07,645 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-12-27 21:37:07,645 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [957126704] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-27 21:37:07,645 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-27 21:37:07,645 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 14 [2021-12-27 21:37:07,646 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2069560785] [2021-12-27 21:37:07,646 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-27 21:37:07,646 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-12-27 21:37:07,646 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-27 21:37:07,647 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-12-27 21:37:07,647 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=129, Unknown=0, NotChecked=0, Total=182 [2021-12-27 21:37:07,647 INFO L87 Difference]: Start difference. First operand 29 states and 32 transitions. Second operand has 14 states, 14 states have (on average 2.5) internal successors, (35), 14 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-27 21:37:07,738 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-27 21:37:07,738 INFO L93 Difference]: Finished difference Result 62 states and 68 transitions. [2021-12-27 21:37:07,751 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-12-27 21:37:07,751 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.5) internal successors, (35), 14 states have internal predecessors, (35), 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 25 [2021-12-27 21:37:07,752 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-27 21:37:07,752 INFO L225 Difference]: With dead ends: 62 [2021-12-27 21:37:07,752 INFO L226 Difference]: Without dead ends: 37 [2021-12-27 21:37:07,752 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 44 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=80, Invalid=192, Unknown=0, NotChecked=0, Total=272 [2021-12-27 21:37:07,753 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 49 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 114 mSolverCounterSat, 43 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 27 SdHoareTripleChecker+Invalid, 157 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 43 IncrementalHoareTripleChecker+Valid, 114 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-27 21:37:07,753 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [49 Valid, 27 Invalid, 157 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [43 Valid, 114 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-27 21:37:07,753 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-12-27 21:37:07,756 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 28. [2021-12-27 21:37:07,756 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 27 states have (on average 1.1111111111111112) internal successors, (30), 27 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-27 21:37:07,756 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2021-12-27 21:37:07,756 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 25 [2021-12-27 21:37:07,757 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-27 21:37:07,757 INFO L470 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2021-12-27 21:37:07,757 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.5) internal successors, (35), 14 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-27 21:37:07,757 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2021-12-27 21:37:07,757 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-12-27 21:37:07,757 INFO L506 BasicCegarLoop]: Found error trace [2021-12-27 21:37:07,757 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-27 21:37:07,775 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-12-27 21:37:07,963 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-27 21:37:07,963 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-27 21:37:07,964 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-27 21:37:07,964 INFO L85 PathProgramCache]: Analyzing trace with hash -1031419092, now seen corresponding path program 5 times [2021-12-27 21:37:07,964 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-27 21:37:07,964 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [192307649] [2021-12-27 21:37:07,964 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-27 21:37:07,964 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-27 21:37:07,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:37:08,021 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 1 proven. 12 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-12-27 21:37:08,022 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-27 21:37:08,022 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [192307649] [2021-12-27 21:37:08,022 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [192307649] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-27 21:37:08,022 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [576050637] [2021-12-27 21:37:08,022 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-12-27 21:37:08,022 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-27 21:37:08,023 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-27 21:37:08,023 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) [2021-12-27 21:37:08,025 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-12-27 21:37:08,065 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-12-27 21:37:08,066 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-27 21:37:08,067 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 8 conjunts are in the unsatisfiable core [2021-12-27 21:37:08,070 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-27 21:37:08,156 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-12-27 21:37:08,156 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-27 21:37:08,214 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-12-27 21:37:08,214 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [576050637] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-27 21:37:08,214 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-27 21:37:08,214 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 14 [2021-12-27 21:37:08,214 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [382024370] [2021-12-27 21:37:08,215 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-27 21:37:08,215 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-12-27 21:37:08,215 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-27 21:37:08,215 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-12-27 21:37:08,216 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=129, Unknown=0, NotChecked=0, Total=182 [2021-12-27 21:37:08,216 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand has 14 states, 14 states have (on average 3.0) internal successors, (42), 14 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-27 21:37:08,321 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-27 21:37:08,321 INFO L93 Difference]: Finished difference Result 36 states and 38 transitions. [2021-12-27 21:37:08,322 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-12-27 21:37:08,322 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.0) internal successors, (42), 14 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 27 [2021-12-27 21:37:08,322 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-27 21:37:08,322 INFO L225 Difference]: With dead ends: 36 [2021-12-27 21:37:08,322 INFO L226 Difference]: Without dead ends: 32 [2021-12-27 21:37:08,323 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 49 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 84 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=101, Invalid=279, Unknown=0, NotChecked=0, Total=380 [2021-12-27 21:37:08,323 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 47 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 135 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 166 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 135 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-27 21:37:08,324 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [47 Valid, 23 Invalid, 166 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 135 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-27 21:37:08,324 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-12-27 21:37:08,327 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2021-12-27 21:37:08,327 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 29 states have (on average 1.103448275862069) internal successors, (32), 29 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-27 21:37:08,327 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2021-12-27 21:37:08,327 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 27 [2021-12-27 21:37:08,327 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-27 21:37:08,328 INFO L470 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2021-12-27 21:37:08,328 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 3.0) internal successors, (42), 14 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-27 21:37:08,328 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2021-12-27 21:37:08,328 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-12-27 21:37:08,328 INFO L506 BasicCegarLoop]: Found error trace [2021-12-27 21:37:08,328 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-27 21:37:08,345 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-12-27 21:37:08,543 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-27 21:37:08,544 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-27 21:37:08,544 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-27 21:37:08,544 INFO L85 PathProgramCache]: Analyzing trace with hash 996931278, now seen corresponding path program 6 times [2021-12-27 21:37:08,544 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-27 21:37:08,545 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [647325233] [2021-12-27 21:37:08,545 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-27 21:37:08,545 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-27 21:37:08,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:37:09,168 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-27 21:37:09,169 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-27 21:37:09,169 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [647325233] [2021-12-27 21:37:09,169 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [647325233] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-27 21:37:09,169 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [425185187] [2021-12-27 21:37:09,169 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-12-27 21:37:09,169 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-27 21:37:09,169 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-27 21:37:09,184 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) [2021-12-27 21:37:09,187 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-12-27 21:37:09,244 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2021-12-27 21:37:09,245 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-27 21:37:09,246 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 37 conjunts are in the unsatisfiable core [2021-12-27 21:37:09,247 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-27 21:37:09,663 INFO L387 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 13 treesize of output 5 [2021-12-27 21:37:09,736 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-27 21:37:09,736 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-27 21:37:10,250 INFO L353 Elim1Store]: treesize reduction 114, result has 46.0 percent of original size [2021-12-27 21:37:10,251 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 0 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 15 case distinctions, treesize of input 53 treesize of output 108 [2021-12-27 21:37:10,477 INFO L353 Elim1Store]: treesize reduction 198, result has 6.2 percent of original size [2021-12-27 21:37:10,477 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 0 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 15 case distinctions, treesize of input 52 treesize of output 23 [2021-12-27 21:37:10,539 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-12-27 21:37:10,540 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [425185187] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-27 21:37:10,540 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-27 21:37:10,540 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 17, 15] total 45 [2021-12-27 21:37:10,540 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [629021321] [2021-12-27 21:37:10,540 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-27 21:37:10,541 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2021-12-27 21:37:10,541 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-27 21:37:10,541 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-12-27 21:37:10,542 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=1825, Unknown=0, NotChecked=0, Total=1980 [2021-12-27 21:37:10,542 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand has 45 states, 45 states have (on average 1.488888888888889) internal successors, (67), 45 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-27 21:37:11,402 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-27 21:37:11,402 INFO L93 Difference]: Finished difference Result 47 states and 50 transitions. [2021-12-27 21:37:11,402 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-12-27 21:37:11,403 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 1.488888888888889) internal successors, (67), 45 states have internal predecessors, (67), 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 29 [2021-12-27 21:37:11,403 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-27 21:37:11,403 INFO L225 Difference]: With dead ends: 47 [2021-12-27 21:37:11,403 INFO L226 Difference]: Without dead ends: 43 [2021-12-27 21:37:11,404 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 31 SyntacticMatches, 4 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 719 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=245, Invalid=3061, Unknown=0, NotChecked=0, Total=3306 [2021-12-27 21:37:11,405 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 15 mSDsluCounter, 70 mSDsCounter, 0 mSdLazyCounter, 758 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 77 SdHoareTripleChecker+Invalid, 787 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 758 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-12-27 21:37:11,405 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 77 Invalid, 787 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 758 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-12-27 21:37:11,405 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2021-12-27 21:37:11,409 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 35. [2021-12-27 21:37:11,409 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 34 states have (on average 1.1176470588235294) internal successors, (38), 34 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-27 21:37:11,410 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 38 transitions. [2021-12-27 21:37:11,410 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 38 transitions. Word has length 29 [2021-12-27 21:37:11,410 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-27 21:37:11,410 INFO L470 AbstractCegarLoop]: Abstraction has 35 states and 38 transitions. [2021-12-27 21:37:11,410 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 45 states have (on average 1.488888888888889) internal successors, (67), 45 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-27 21:37:11,410 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 38 transitions. [2021-12-27 21:37:11,411 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-12-27 21:37:11,411 INFO L506 BasicCegarLoop]: Found error trace [2021-12-27 21:37:11,411 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-27 21:37:11,435 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-12-27 21:37:11,623 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-27 21:37:11,624 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-27 21:37:11,624 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-27 21:37:11,624 INFO L85 PathProgramCache]: Analyzing trace with hash 326484464, now seen corresponding path program 7 times [2021-12-27 21:37:11,624 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-27 21:37:11,624 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [779632632] [2021-12-27 21:37:11,624 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-27 21:37:11,624 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-27 21:37:11,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:37:11,705 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 11 proven. 14 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-12-27 21:37:11,705 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-27 21:37:11,705 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [779632632] [2021-12-27 21:37:11,705 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [779632632] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-27 21:37:11,706 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [780880613] [2021-12-27 21:37:11,706 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-12-27 21:37:11,706 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-27 21:37:11,706 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-27 21:37:11,707 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) [2021-12-27 21:37:11,707 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-12-27 21:37:11,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:37:11,742 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 10 conjunts are in the unsatisfiable core [2021-12-27 21:37:11,743 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-27 21:37:11,828 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 16 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-12-27 21:37:11,829 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-27 21:37:11,887 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 16 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-12-27 21:37:11,888 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [780880613] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-27 21:37:11,888 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-27 21:37:11,888 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 17 [2021-12-27 21:37:11,888 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1547821489] [2021-12-27 21:37:11,888 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-27 21:37:11,889 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-12-27 21:37:11,889 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-27 21:37:11,889 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-12-27 21:37:11,889 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=197, Unknown=0, NotChecked=0, Total=272 [2021-12-27 21:37:11,889 INFO L87 Difference]: Start difference. First operand 35 states and 38 transitions. Second operand has 17 states, 17 states have (on average 2.411764705882353) internal successors, (41), 17 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-27 21:37:12,003 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-27 21:37:12,003 INFO L93 Difference]: Finished difference Result 74 states and 80 transitions. [2021-12-27 21:37:12,003 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-12-27 21:37:12,003 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.411764705882353) internal successors, (41), 17 states have internal predecessors, (41), 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 31 [2021-12-27 21:37:12,003 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-27 21:37:12,004 INFO L225 Difference]: With dead ends: 74 [2021-12-27 21:37:12,004 INFO L226 Difference]: Without dead ends: 43 [2021-12-27 21:37:12,004 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 55 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 107 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=117, Invalid=303, Unknown=0, NotChecked=0, Total=420 [2021-12-27 21:37:12,005 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 74 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 124 mSolverCounterSat, 71 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 74 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 195 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 71 IncrementalHoareTripleChecker+Valid, 124 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-27 21:37:12,005 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [74 Valid, 23 Invalid, 195 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [71 Valid, 124 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-27 21:37:12,006 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2021-12-27 21:37:12,009 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 34. [2021-12-27 21:37:12,009 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 33 states have (on average 1.0909090909090908) internal successors, (36), 33 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-27 21:37:12,009 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 36 transitions. [2021-12-27 21:37:12,010 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 36 transitions. Word has length 31 [2021-12-27 21:37:12,010 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-27 21:37:12,010 INFO L470 AbstractCegarLoop]: Abstraction has 34 states and 36 transitions. [2021-12-27 21:37:12,010 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 2.411764705882353) internal successors, (41), 17 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-27 21:37:12,010 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 36 transitions. [2021-12-27 21:37:12,011 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-12-27 21:37:12,011 INFO L506 BasicCegarLoop]: Found error trace [2021-12-27 21:37:12,011 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-27 21:37:12,043 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2021-12-27 21:37:12,227 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-27 21:37:12,227 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-27 21:37:12,228 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-27 21:37:12,228 INFO L85 PathProgramCache]: Analyzing trace with hash -1551752238, now seen corresponding path program 8 times [2021-12-27 21:37:12,228 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-27 21:37:12,228 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [311506113] [2021-12-27 21:37:12,228 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-27 21:37:12,228 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-27 21:37:12,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:37:12,300 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 4 proven. 21 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-12-27 21:37:12,301 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-27 21:37:12,301 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [311506113] [2021-12-27 21:37:12,301 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [311506113] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-27 21:37:12,301 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [488122959] [2021-12-27 21:37:12,301 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-27 21:37:12,301 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-27 21:37:12,302 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-27 21:37:12,302 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) [2021-12-27 21:37:12,343 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-12-27 21:37:12,353 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-27 21:37:12,353 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-27 21:37:12,354 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 10 conjunts are in the unsatisfiable core [2021-12-27 21:37:12,356 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-27 21:37:12,444 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 9 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-12-27 21:37:12,444 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-27 21:37:12,511 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 9 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-12-27 21:37:12,512 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [488122959] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-27 21:37:12,512 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-27 21:37:12,512 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 17 [2021-12-27 21:37:12,512 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [458864431] [2021-12-27 21:37:12,512 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-27 21:37:12,512 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-12-27 21:37:12,512 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-27 21:37:12,513 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-12-27 21:37:12,513 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=197, Unknown=0, NotChecked=0, Total=272 [2021-12-27 21:37:12,513 INFO L87 Difference]: Start difference. First operand 34 states and 36 transitions. Second operand has 17 states, 17 states have (on average 2.411764705882353) internal successors, (41), 17 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-27 21:37:12,649 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-27 21:37:12,649 INFO L93 Difference]: Finished difference Result 42 states and 44 transitions. [2021-12-27 21:37:12,649 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-12-27 21:37:12,649 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.411764705882353) internal successors, (41), 17 states have internal predecessors, (41), 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 33 [2021-12-27 21:37:12,649 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-27 21:37:12,650 INFO L225 Difference]: With dead ends: 42 [2021-12-27 21:37:12,650 INFO L226 Difference]: Without dead ends: 38 [2021-12-27 21:37:12,650 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 58 SyntacticMatches, 2 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 148 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=149, Invalid=451, Unknown=0, NotChecked=0, Total=600 [2021-12-27 21:37:12,650 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 63 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 149 mSolverCounterSat, 49 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 63 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 198 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 49 IncrementalHoareTripleChecker+Valid, 149 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-27 21:37:12,650 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [63 Valid, 18 Invalid, 198 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [49 Valid, 149 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-27 21:37:12,651 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-12-27 21:37:12,654 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 36. [2021-12-27 21:37:12,654 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 35 states have (on average 1.0857142857142856) internal successors, (38), 35 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-27 21:37:12,654 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2021-12-27 21:37:12,654 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 33 [2021-12-27 21:37:12,655 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-27 21:37:12,655 INFO L470 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2021-12-27 21:37:12,655 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 2.411764705882353) internal successors, (41), 17 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-27 21:37:12,655 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2021-12-27 21:37:12,655 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-12-27 21:37:12,655 INFO L506 BasicCegarLoop]: Found error trace [2021-12-27 21:37:12,655 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-27 21:37:12,674 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-12-27 21:37:12,856 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-12-27 21:37:12,856 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-27 21:37:12,856 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-27 21:37:12,856 INFO L85 PathProgramCache]: Analyzing trace with hash -827015692, now seen corresponding path program 9 times [2021-12-27 21:37:12,857 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-27 21:37:12,857 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [935990657] [2021-12-27 21:37:12,857 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-27 21:37:12,857 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-27 21:37:12,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:37:13,609 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 0 proven. 48 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-27 21:37:13,610 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-27 21:37:13,610 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [935990657] [2021-12-27 21:37:13,610 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [935990657] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-27 21:37:13,610 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1526468014] [2021-12-27 21:37:13,610 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-27 21:37:13,610 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-27 21:37:13,610 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-27 21:37:13,611 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) [2021-12-27 21:37:13,612 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-12-27 21:37:13,652 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-12-27 21:37:13,652 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-27 21:37:13,653 INFO L263 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 54 conjunts are in the unsatisfiable core [2021-12-27 21:37:13,655 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-27 21:37:13,714 INFO L387 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 15 treesize of output 11 [2021-12-27 21:37:14,981 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-27 21:37:14,982 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-27 21:37:14,982 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-27 21:37:14,983 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-27 21:37:14,984 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-27 21:37:15,003 INFO L353 Elim1Store]: treesize reduction 16, result has 72.4 percent of original size [2021-12-27 21:37:15,003 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 3 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 10 case distinctions, treesize of input 48 treesize of output 55 [2021-12-27 21:37:15,205 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 5 proven. 39 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-12-27 21:37:15,205 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-27 21:37:17,669 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-12-27 21:37:17,670 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1526468014] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-27 21:37:17,670 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-27 21:37:17,670 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 26, 21] total 66 [2021-12-27 21:37:17,670 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [694314872] [2021-12-27 21:37:17,670 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-27 21:37:17,670 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 66 states [2021-12-27 21:37:17,670 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-27 21:37:17,671 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2021-12-27 21:37:17,671 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=310, Invalid=3980, Unknown=0, NotChecked=0, Total=4290 [2021-12-27 21:37:17,672 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand has 66 states, 66 states have (on average 1.3484848484848484) internal successors, (89), 66 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-27 21:37:19,732 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-27 21:37:19,732 INFO L93 Difference]: Finished difference Result 74 states and 80 transitions. [2021-12-27 21:37:19,733 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2021-12-27 21:37:19,733 INFO L78 Accepts]: Start accepts. Automaton has has 66 states, 66 states have (on average 1.3484848484848484) internal successors, (89), 66 states have internal predecessors, (89), 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 35 [2021-12-27 21:37:19,733 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-27 21:37:19,733 INFO L225 Difference]: With dead ends: 74 [2021-12-27 21:37:19,734 INFO L226 Difference]: Without dead ends: 70 [2021-12-27 21:37:19,735 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 27 SyntacticMatches, 4 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2063 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=710, Invalid=8796, Unknown=0, NotChecked=0, Total=9506 [2021-12-27 21:37:19,736 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 27 mSDsluCounter, 95 mSDsCounter, 0 mSdLazyCounter, 181 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 102 SdHoareTripleChecker+Invalid, 502 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 181 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 300 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-27 21:37:19,736 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 102 Invalid, 502 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 181 Invalid, 0 Unknown, 300 Unchecked, 0.1s Time] [2021-12-27 21:37:19,736 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2021-12-27 21:37:19,741 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 41. [2021-12-27 21:37:19,742 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 40 states have (on average 1.1) internal successors, (44), 40 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-27 21:37:19,742 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 44 transitions. [2021-12-27 21:37:19,742 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 44 transitions. Word has length 35 [2021-12-27 21:37:19,742 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-27 21:37:19,742 INFO L470 AbstractCegarLoop]: Abstraction has 41 states and 44 transitions. [2021-12-27 21:37:19,743 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 66 states, 66 states have (on average 1.3484848484848484) internal successors, (89), 66 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-27 21:37:19,743 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 44 transitions. [2021-12-27 21:37:19,743 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-12-27 21:37:19,743 INFO L506 BasicCegarLoop]: Found error trace [2021-12-27 21:37:19,743 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-27 21:37:19,761 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-12-27 21:37:19,943 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-27 21:37:19,944 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-27 21:37:19,944 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-27 21:37:19,944 INFO L85 PathProgramCache]: Analyzing trace with hash -139896938, now seen corresponding path program 10 times [2021-12-27 21:37:19,944 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-27 21:37:19,945 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1728297377] [2021-12-27 21:37:19,945 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-27 21:37:19,945 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-27 21:37:19,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:37:20,019 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 18 proven. 23 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-12-27 21:37:20,020 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-27 21:37:20,020 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1728297377] [2021-12-27 21:37:20,020 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1728297377] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-27 21:37:20,020 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [69688155] [2021-12-27 21:37:20,020 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-27 21:37:20,020 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-27 21:37:20,021 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-27 21:37:20,022 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) [2021-12-27 21:37:20,026 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-12-27 21:37:20,061 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-27 21:37:20,061 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-27 21:37:20,062 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 12 conjunts are in the unsatisfiable core [2021-12-27 21:37:20,063 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-27 21:37:20,184 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 25 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-12-27 21:37:20,184 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-27 21:37:20,263 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 25 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-12-27 21:37:20,263 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [69688155] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-27 21:37:20,264 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-27 21:37:20,264 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 20 [2021-12-27 21:37:20,264 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1700080783] [2021-12-27 21:37:20,264 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-27 21:37:20,264 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-12-27 21:37:20,264 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-27 21:37:20,265 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-12-27 21:37:20,265 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=279, Unknown=0, NotChecked=0, Total=380 [2021-12-27 21:37:20,265 INFO L87 Difference]: Start difference. First operand 41 states and 44 transitions. Second operand has 20 states, 20 states have (on average 2.35) internal successors, (47), 20 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-27 21:37:20,400 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-27 21:37:20,400 INFO L93 Difference]: Finished difference Result 86 states and 92 transitions. [2021-12-27 21:37:20,400 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-12-27 21:37:20,400 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.35) internal successors, (47), 20 states have internal predecessors, (47), 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 37 [2021-12-27 21:37:20,401 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-27 21:37:20,401 INFO L225 Difference]: With dead ends: 86 [2021-12-27 21:37:20,401 INFO L226 Difference]: Without dead ends: 49 [2021-12-27 21:37:20,402 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 66 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 155 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=161, Invalid=439, Unknown=0, NotChecked=0, Total=600 [2021-12-27 21:37:20,402 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 84 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 156 mSolverCounterSat, 85 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 84 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 241 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 85 IncrementalHoareTripleChecker+Valid, 156 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-27 21:37:20,402 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [84 Valid, 36 Invalid, 241 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [85 Valid, 156 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-27 21:37:20,403 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-12-27 21:37:20,407 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 40. [2021-12-27 21:37:20,408 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 39 states have (on average 1.0769230769230769) internal successors, (42), 39 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-27 21:37:20,408 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 42 transitions. [2021-12-27 21:37:20,408 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 42 transitions. Word has length 37 [2021-12-27 21:37:20,408 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-27 21:37:20,408 INFO L470 AbstractCegarLoop]: Abstraction has 40 states and 42 transitions. [2021-12-27 21:37:20,409 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 2.35) internal successors, (47), 20 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-27 21:37:20,409 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 42 transitions. [2021-12-27 21:37:20,412 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-12-27 21:37:20,412 INFO L506 BasicCegarLoop]: Found error trace [2021-12-27 21:37:20,412 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-27 21:37:20,433 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-12-27 21:37:20,623 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,SelfDestructingSolverStorable12 [2021-12-27 21:37:20,623 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-27 21:37:20,624 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-27 21:37:20,624 INFO L85 PathProgramCache]: Analyzing trace with hash 38479864, now seen corresponding path program 11 times [2021-12-27 21:37:20,624 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-27 21:37:20,624 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1004007901] [2021-12-27 21:37:20,624 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-27 21:37:20,624 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-27 21:37:20,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:37:20,707 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 9 proven. 32 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-12-27 21:37:20,708 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-27 21:37:20,708 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1004007901] [2021-12-27 21:37:20,708 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1004007901] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-27 21:37:20,708 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1986988956] [2021-12-27 21:37:20,708 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-12-27 21:37:20,708 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-27 21:37:20,709 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-27 21:37:20,710 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) [2021-12-27 21:37:20,711 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-12-27 21:37:20,760 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-12-27 21:37:20,760 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-27 21:37:20,762 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 12 conjunts are in the unsatisfiable core [2021-12-27 21:37:20,763 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-27 21:37:20,886 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 16 proven. 25 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-12-27 21:37:20,886 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-27 21:37:20,959 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 16 proven. 25 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-12-27 21:37:20,959 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1986988956] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-27 21:37:20,959 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-27 21:37:20,959 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 20 [2021-12-27 21:37:20,959 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1884131956] [2021-12-27 21:37:20,960 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-27 21:37:20,960 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-12-27 21:37:20,960 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-27 21:37:20,960 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-12-27 21:37:20,960 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=279, Unknown=0, NotChecked=0, Total=380 [2021-12-27 21:37:20,961 INFO L87 Difference]: Start difference. First operand 40 states and 42 transitions. Second operand has 20 states, 20 states have (on average 2.35) internal successors, (47), 20 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-27 21:37:21,135 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-27 21:37:21,135 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2021-12-27 21:37:21,135 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-12-27 21:37:21,135 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.35) internal successors, (47), 20 states have internal predecessors, (47), 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 39 [2021-12-27 21:37:21,136 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-27 21:37:21,136 INFO L225 Difference]: With dead ends: 48 [2021-12-27 21:37:21,136 INFO L226 Difference]: Without dead ends: 44 [2021-12-27 21:37:21,136 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 69 SyntacticMatches, 2 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 226 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=207, Invalid=663, Unknown=0, NotChecked=0, Total=870 [2021-12-27 21:37:21,137 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 67 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 222 mSolverCounterSat, 58 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 67 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 280 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 58 IncrementalHoareTripleChecker+Valid, 222 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-27 21:37:21,137 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [67 Valid, 25 Invalid, 280 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [58 Valid, 222 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-27 21:37:21,137 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-12-27 21:37:21,142 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 42. [2021-12-27 21:37:21,142 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 41 states have (on average 1.0731707317073171) internal successors, (44), 41 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-27 21:37:21,143 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 44 transitions. [2021-12-27 21:37:21,143 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 44 transitions. Word has length 39 [2021-12-27 21:37:21,143 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-27 21:37:21,143 INFO L470 AbstractCegarLoop]: Abstraction has 42 states and 44 transitions. [2021-12-27 21:37:21,143 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 2.35) internal successors, (47), 20 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-27 21:37:21,143 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 44 transitions. [2021-12-27 21:37:21,144 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-12-27 21:37:21,144 INFO L506 BasicCegarLoop]: Found error trace [2021-12-27 21:37:21,144 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-27 21:37:21,165 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-12-27 21:37:21,359 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,SelfDestructingSolverStorable13 [2021-12-27 21:37:21,359 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-27 21:37:21,360 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-27 21:37:21,360 INFO L85 PathProgramCache]: Analyzing trace with hash -1622323046, now seen corresponding path program 12 times [2021-12-27 21:37:21,360 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-27 21:37:21,360 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1571841369] [2021-12-27 21:37:21,360 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-27 21:37:21,360 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-27 21:37:21,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:37:22,570 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 1 proven. 74 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-27 21:37:22,570 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-27 21:37:22,570 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1571841369] [2021-12-27 21:37:22,570 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1571841369] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-27 21:37:22,570 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [115065896] [2021-12-27 21:37:22,571 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-12-27 21:37:22,571 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-27 21:37:22,571 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-27 21:37:22,572 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) [2021-12-27 21:37:22,572 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-12-27 21:37:22,625 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 6 check-sat command(s) [2021-12-27 21:37:22,626 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-27 21:37:22,627 INFO L263 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 62 conjunts are in the unsatisfiable core [2021-12-27 21:37:22,628 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-27 21:37:22,708 INFO L387 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 15 treesize of output 11 [2021-12-27 21:37:23,857 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-27 21:37:23,857 INFO L387 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 28 treesize of output 41 [2021-12-27 21:37:24,107 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 3 proven. 71 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-27 21:37:24,107 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-27 21:37:27,787 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 0 proven. 59 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-12-27 21:37:27,787 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [115065896] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-27 21:37:27,787 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-27 21:37:27,787 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 30, 25] total 78 [2021-12-27 21:37:27,787 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2020644] [2021-12-27 21:37:27,787 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-27 21:37:27,788 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 78 states [2021-12-27 21:37:27,788 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-27 21:37:27,788 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 78 interpolants. [2021-12-27 21:37:27,789 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=332, Invalid=5674, Unknown=0, NotChecked=0, Total=6006 [2021-12-27 21:37:27,789 INFO L87 Difference]: Start difference. First operand 42 states and 44 transitions. Second operand has 78 states, 78 states have (on average 1.3333333333333333) internal successors, (104), 78 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-27 21:37:30,479 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-27 21:37:30,479 INFO L93 Difference]: Finished difference Result 61 states and 64 transitions. [2021-12-27 21:37:30,481 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-12-27 21:37:30,481 INFO L78 Accepts]: Start accepts. Automaton has has 78 states, 78 states have (on average 1.3333333333333333) internal successors, (104), 78 states have internal predecessors, (104), 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 41 [2021-12-27 21:37:30,481 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-27 21:37:30,482 INFO L225 Difference]: With dead ends: 61 [2021-12-27 21:37:30,482 INFO L226 Difference]: Without dead ends: 57 [2021-12-27 21:37:30,484 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 33 SyntacticMatches, 7 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2493 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=738, Invalid=11694, Unknown=0, NotChecked=0, Total=12432 [2021-12-27 21:37:30,484 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 21 mSDsluCounter, 100 mSDsCounter, 0 mSdLazyCounter, 661 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 107 SdHoareTripleChecker+Invalid, 1262 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 661 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 550 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-27 21:37:30,484 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [21 Valid, 107 Invalid, 1262 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 661 Invalid, 0 Unknown, 550 Unchecked, 0.3s Time] [2021-12-27 21:37:30,485 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-12-27 21:37:30,491 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 47. [2021-12-27 21:37:30,492 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 46 states have (on average 1.0869565217391304) internal successors, (50), 46 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-27 21:37:30,492 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 50 transitions. [2021-12-27 21:37:30,492 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 50 transitions. Word has length 41 [2021-12-27 21:37:30,492 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-27 21:37:30,492 INFO L470 AbstractCegarLoop]: Abstraction has 47 states and 50 transitions. [2021-12-27 21:37:30,492 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 78 states, 78 states have (on average 1.3333333333333333) internal successors, (104), 78 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-27 21:37:30,493 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 50 transitions. [2021-12-27 21:37:30,493 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-12-27 21:37:30,493 INFO L506 BasicCegarLoop]: Found error trace [2021-12-27 21:37:30,493 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-27 21:37:30,512 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-12-27 21:37:30,712 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,SelfDestructingSolverStorable14 [2021-12-27 21:37:30,712 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-27 21:37:30,712 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-27 21:37:30,713 INFO L85 PathProgramCache]: Analyzing trace with hash 73914556, now seen corresponding path program 13 times [2021-12-27 21:37:30,713 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-27 21:37:30,713 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2122738210] [2021-12-27 21:37:30,713 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-27 21:37:30,713 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-27 21:37:30,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:37:30,810 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 27 proven. 34 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-12-27 21:37:30,811 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-27 21:37:30,811 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2122738210] [2021-12-27 21:37:30,811 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2122738210] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-27 21:37:30,811 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [101765367] [2021-12-27 21:37:30,811 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-12-27 21:37:30,811 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-27 21:37:30,811 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-27 21:37:30,812 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) [2021-12-27 21:37:30,813 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-12-27 21:37:30,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:37:30,856 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 14 conjunts are in the unsatisfiable core [2021-12-27 21:37:30,860 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-27 21:37:31,008 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 36 proven. 25 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-12-27 21:37:31,008 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-27 21:37:31,091 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 36 proven. 25 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-12-27 21:37:31,091 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [101765367] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-27 21:37:31,091 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-27 21:37:31,091 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 23 [2021-12-27 21:37:31,091 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1231672085] [2021-12-27 21:37:31,091 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-27 21:37:31,092 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-12-27 21:37:31,092 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-27 21:37:31,092 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-12-27 21:37:31,092 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=375, Unknown=0, NotChecked=0, Total=506 [2021-12-27 21:37:31,092 INFO L87 Difference]: Start difference. First operand 47 states and 50 transitions. Second operand has 23 states, 23 states have (on average 2.3043478260869565) internal successors, (53), 23 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-27 21:37:31,269 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-27 21:37:31,269 INFO L93 Difference]: Finished difference Result 98 states and 104 transitions. [2021-12-27 21:37:31,269 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-12-27 21:37:31,270 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 2.3043478260869565) internal successors, (53), 23 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 43 [2021-12-27 21:37:31,270 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-27 21:37:31,270 INFO L225 Difference]: With dead ends: 98 [2021-12-27 21:37:31,270 INFO L226 Difference]: Without dead ends: 55 [2021-12-27 21:37:31,276 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 77 SyntacticMatches, 1 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 211 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=212, Invalid=600, Unknown=0, NotChecked=0, Total=812 [2021-12-27 21:37:31,276 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 104 mSDsluCounter, 23 mSDsCounter, 0 mSdLazyCounter, 173 mSolverCounterSat, 96 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 104 SdHoareTripleChecker+Valid, 31 SdHoareTripleChecker+Invalid, 269 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 96 IncrementalHoareTripleChecker+Valid, 173 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-27 21:37:31,276 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [104 Valid, 31 Invalid, 269 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [96 Valid, 173 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-27 21:37:31,278 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2021-12-27 21:37:31,293 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 46. [2021-12-27 21:37:31,293 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 45 states have (on average 1.0666666666666667) internal successors, (48), 45 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-27 21:37:31,293 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 48 transitions. [2021-12-27 21:37:31,293 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 48 transitions. Word has length 43 [2021-12-27 21:37:31,293 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-27 21:37:31,294 INFO L470 AbstractCegarLoop]: Abstraction has 46 states and 48 transitions. [2021-12-27 21:37:31,294 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 2.3043478260869565) internal successors, (53), 23 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-27 21:37:31,294 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 48 transitions. [2021-12-27 21:37:31,294 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-12-27 21:37:31,294 INFO L506 BasicCegarLoop]: Found error trace [2021-12-27 21:37:31,294 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-27 21:37:31,312 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-12-27 21:37:31,508 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,SelfDestructingSolverStorable15 [2021-12-27 21:37:31,508 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-27 21:37:31,509 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-27 21:37:31,509 INFO L85 PathProgramCache]: Analyzing trace with hash 1970943902, now seen corresponding path program 14 times [2021-12-27 21:37:31,509 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-27 21:37:31,509 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1216004347] [2021-12-27 21:37:31,509 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-27 21:37:31,509 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-27 21:37:31,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:37:31,591 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 16 proven. 45 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-12-27 21:37:31,591 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-27 21:37:31,591 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1216004347] [2021-12-27 21:37:31,591 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1216004347] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-27 21:37:31,591 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1399831216] [2021-12-27 21:37:31,591 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-27 21:37:31,591 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-27 21:37:31,591 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-27 21:37:31,592 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) [2021-12-27 21:37:31,593 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-12-27 21:37:31,645 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-27 21:37:31,645 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-27 21:37:31,646 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 14 conjunts are in the unsatisfiable core [2021-12-27 21:37:31,646 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-27 21:37:31,800 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 25 proven. 36 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-12-27 21:37:31,800 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-27 21:37:31,893 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 25 proven. 36 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-12-27 21:37:31,893 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1399831216] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-27 21:37:31,894 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-27 21:37:31,894 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 23 [2021-12-27 21:37:31,894 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [176793763] [2021-12-27 21:37:31,894 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-27 21:37:31,894 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-12-27 21:37:31,895 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-27 21:37:31,895 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-12-27 21:37:31,895 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=375, Unknown=0, NotChecked=0, Total=506 [2021-12-27 21:37:31,895 INFO L87 Difference]: Start difference. First operand 46 states and 48 transitions. Second operand has 23 states, 23 states have (on average 2.3043478260869565) internal successors, (53), 23 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-27 21:37:32,069 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-27 21:37:32,070 INFO L93 Difference]: Finished difference Result 54 states and 56 transitions. [2021-12-27 21:37:32,070 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-12-27 21:37:32,070 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 2.3043478260869565) internal successors, (53), 23 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 45 [2021-12-27 21:37:32,070 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-27 21:37:32,070 INFO L225 Difference]: With dead ends: 54 [2021-12-27 21:37:32,070 INFO L226 Difference]: Without dead ends: 50 [2021-12-27 21:37:32,071 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 80 SyntacticMatches, 2 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 319 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=275, Invalid=915, Unknown=0, NotChecked=0, Total=1190 [2021-12-27 21:37:32,071 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 109 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 201 mSolverCounterSat, 84 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 109 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 285 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 84 IncrementalHoareTripleChecker+Valid, 201 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-27 21:37:32,072 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [109 Valid, 16 Invalid, 285 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [84 Valid, 201 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-27 21:37:32,072 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-12-27 21:37:32,078 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 48. [2021-12-27 21:37:32,078 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 47 states have (on average 1.0638297872340425) internal successors, (50), 47 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-27 21:37:32,078 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 50 transitions. [2021-12-27 21:37:32,079 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 50 transitions. Word has length 45 [2021-12-27 21:37:32,079 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-27 21:37:32,079 INFO L470 AbstractCegarLoop]: Abstraction has 48 states and 50 transitions. [2021-12-27 21:37:32,079 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 2.3043478260869565) internal successors, (53), 23 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-27 21:37:32,079 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 50 transitions. [2021-12-27 21:37:32,080 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-12-27 21:37:32,080 INFO L506 BasicCegarLoop]: Found error trace [2021-12-27 21:37:32,080 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-27 21:37:32,096 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-12-27 21:37:32,287 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16,15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-27 21:37:32,287 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-27 21:37:32,288 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-27 21:37:32,288 INFO L85 PathProgramCache]: Analyzing trace with hash 49745600, now seen corresponding path program 15 times [2021-12-27 21:37:32,288 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-27 21:37:32,288 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1413514601] [2021-12-27 21:37:32,288 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-27 21:37:32,288 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-27 21:37:32,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:37:33,929 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 0 proven. 108 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-27 21:37:33,929 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-27 21:37:33,929 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1413514601] [2021-12-27 21:37:33,929 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1413514601] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-27 21:37:33,929 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [184012448] [2021-12-27 21:37:33,929 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-27 21:37:33,929 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-27 21:37:33,930 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-27 21:37:33,930 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) [2021-12-27 21:37:33,931 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-12-27 21:37:33,988 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2021-12-27 21:37:33,988 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-27 21:37:33,990 INFO L263 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 72 conjunts are in the unsatisfiable core [2021-12-27 21:37:33,991 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-27 21:37:34,067 INFO L387 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 15 treesize of output 11 [2021-12-27 21:37:35,762 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-27 21:37:35,764 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-27 21:37:35,765 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-27 21:37:35,766 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-27 21:37:35,767 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-27 21:37:35,767 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-27 21:37:35,768 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-27 21:37:35,768 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-27 21:37:35,770 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-27 21:37:35,788 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-27 21:37:35,788 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 9 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 15 case distinctions, treesize of input 58 treesize of output 103 [2021-12-27 21:37:36,044 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 7 proven. 92 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-12-27 21:37:36,044 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-27 21:37:40,822 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 0 proven. 83 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-12-27 21:37:40,822 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [184012448] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-27 21:37:40,822 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-27 21:37:40,822 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 33, 29] total 92 [2021-12-27 21:37:40,822 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [808817451] [2021-12-27 21:37:40,823 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-27 21:37:40,823 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 92 states [2021-12-27 21:37:40,823 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-27 21:37:40,823 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 92 interpolants. [2021-12-27 21:37:40,824 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=495, Invalid=7877, Unknown=0, NotChecked=0, Total=8372 [2021-12-27 21:37:40,825 INFO L87 Difference]: Start difference. First operand 48 states and 50 transitions. Second operand has 92 states, 92 states have (on average 1.2717391304347827) internal successors, (117), 92 states have internal predecessors, (117), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-27 21:37:45,293 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-27 21:37:45,293 INFO L93 Difference]: Finished difference Result 70 states and 73 transitions. [2021-12-27 21:37:45,293 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-12-27 21:37:45,293 INFO L78 Accepts]: Start accepts. Automaton has has 92 states, 92 states have (on average 1.2717391304347827) internal successors, (117), 92 states have internal predecessors, (117), 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 47 [2021-12-27 21:37:45,294 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-27 21:37:45,294 INFO L225 Difference]: With dead ends: 70 [2021-12-27 21:37:45,294 INFO L226 Difference]: Without dead ends: 66 [2021-12-27 21:37:45,295 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 177 GetRequests, 37 SyntacticMatches, 6 SemanticMatches, 134 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3455 ImplicationChecksByTransitivity, 9.9s TimeCoverageRelationStatistics Valid=1115, Invalid=17245, Unknown=0, NotChecked=0, Total=18360 [2021-12-27 21:37:45,295 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 48 mSDsluCounter, 112 mSDsCounter, 0 mSdLazyCounter, 906 mSolverCounterSat, 120 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 119 SdHoareTripleChecker+Invalid, 1883 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 120 IncrementalHoareTripleChecker+Valid, 906 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 857 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-12-27 21:37:45,296 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [48 Valid, 119 Invalid, 1883 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [120 Valid, 906 Invalid, 0 Unknown, 857 Unchecked, 0.5s Time] [2021-12-27 21:37:45,296 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2021-12-27 21:37:45,305 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 53. [2021-12-27 21:37:45,305 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 52 states have (on average 1.0769230769230769) internal successors, (56), 52 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-27 21:37:45,305 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 56 transitions. [2021-12-27 21:37:45,305 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 56 transitions. Word has length 47 [2021-12-27 21:37:45,306 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-27 21:37:45,306 INFO L470 AbstractCegarLoop]: Abstraction has 53 states and 56 transitions. [2021-12-27 21:37:45,306 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 92 states, 92 states have (on average 1.2717391304347827) internal successors, (117), 92 states have internal predecessors, (117), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-27 21:37:45,306 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 56 transitions. [2021-12-27 21:37:45,306 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-12-27 21:37:45,306 INFO L506 BasicCegarLoop]: Found error trace [2021-12-27 21:37:45,306 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-27 21:37:45,324 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-12-27 21:37:45,507 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,SelfDestructingSolverStorable17 [2021-12-27 21:37:45,507 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-27 21:37:45,507 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-27 21:37:45,508 INFO L85 PathProgramCache]: Analyzing trace with hash 614114658, now seen corresponding path program 16 times [2021-12-27 21:37:45,508 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-27 21:37:45,508 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1466044093] [2021-12-27 21:37:45,508 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-27 21:37:45,508 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-27 21:37:45,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:37:45,626 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 38 proven. 47 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-12-27 21:37:45,627 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-27 21:37:45,627 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1466044093] [2021-12-27 21:37:45,627 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1466044093] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-27 21:37:45,627 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1630730477] [2021-12-27 21:37:45,627 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-27 21:37:45,627 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-27 21:37:45,627 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-27 21:37:45,640 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) [2021-12-27 21:37:45,642 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-12-27 21:37:45,689 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-27 21:37:45,689 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-27 21:37:45,690 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 16 conjunts are in the unsatisfiable core [2021-12-27 21:37:45,692 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-27 21:37:45,875 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 49 proven. 36 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-12-27 21:37:45,875 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-27 21:37:45,953 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 49 proven. 36 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-12-27 21:37:45,953 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1630730477] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-27 21:37:45,953 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-27 21:37:45,954 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 26 [2021-12-27 21:37:45,954 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [512387346] [2021-12-27 21:37:45,954 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-27 21:37:45,954 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-12-27 21:37:45,954 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-27 21:37:45,954 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-12-27 21:37:45,955 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=165, Invalid=485, Unknown=0, NotChecked=0, Total=650 [2021-12-27 21:37:45,955 INFO L87 Difference]: Start difference. First operand 53 states and 56 transitions. Second operand has 26 states, 26 states have (on average 2.269230769230769) internal successors, (59), 26 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-27 21:37:46,172 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-27 21:37:46,172 INFO L93 Difference]: Finished difference Result 110 states and 116 transitions. [2021-12-27 21:37:46,172 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-12-27 21:37:46,172 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.269230769230769) internal successors, (59), 26 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 49 [2021-12-27 21:37:46,172 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-27 21:37:46,173 INFO L225 Difference]: With dead ends: 110 [2021-12-27 21:37:46,173 INFO L226 Difference]: Without dead ends: 61 [2021-12-27 21:37:46,173 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 88 SyntacticMatches, 1 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 275 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=270, Invalid=786, Unknown=0, NotChecked=0, Total=1056 [2021-12-27 21:37:46,173 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 96 mSDsluCounter, 26 mSDsCounter, 0 mSdLazyCounter, 253 mSolverCounterSat, 86 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 96 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 339 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 86 IncrementalHoareTripleChecker+Valid, 253 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-27 21:37:46,174 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [96 Valid, 34 Invalid, 339 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [86 Valid, 253 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-27 21:37:46,174 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2021-12-27 21:37:46,182 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 52. [2021-12-27 21:37:46,183 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 51 states have (on average 1.0588235294117647) internal successors, (54), 51 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-27 21:37:46,183 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 54 transitions. [2021-12-27 21:37:46,183 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 54 transitions. Word has length 49 [2021-12-27 21:37:46,183 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-27 21:37:46,184 INFO L470 AbstractCegarLoop]: Abstraction has 52 states and 54 transitions. [2021-12-27 21:37:46,184 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 2.269230769230769) internal successors, (59), 26 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-27 21:37:46,184 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 54 transitions. [2021-12-27 21:37:46,184 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-12-27 21:37:46,184 INFO L506 BasicCegarLoop]: Found error trace [2021-12-27 21:37:46,184 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-27 21:37:46,203 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-12-27 21:37:46,391 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,17 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-27 21:37:46,391 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-27 21:37:46,392 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-27 21:37:46,392 INFO L85 PathProgramCache]: Analyzing trace with hash 2099294916, now seen corresponding path program 17 times [2021-12-27 21:37:46,392 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-27 21:37:46,392 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1255062377] [2021-12-27 21:37:46,392 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-27 21:37:46,392 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-27 21:37:46,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:37:46,501 INFO L134 CoverageAnalysis]: Checked inductivity of 134 backedges. 25 proven. 60 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-12-27 21:37:46,502 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-27 21:37:46,502 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1255062377] [2021-12-27 21:37:46,502 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1255062377] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-27 21:37:46,502 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1720818300] [2021-12-27 21:37:46,502 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-12-27 21:37:46,502 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-27 21:37:46,502 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-27 21:37:46,503 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) [2021-12-27 21:37:46,504 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-12-27 21:37:46,640 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 8 check-sat command(s) [2021-12-27 21:37:46,640 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-27 21:37:46,642 INFO L263 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 16 conjunts are in the unsatisfiable core [2021-12-27 21:37:46,643 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-27 21:37:46,810 INFO L134 CoverageAnalysis]: Checked inductivity of 134 backedges. 36 proven. 49 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-12-27 21:37:46,810 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-27 21:37:46,900 INFO L134 CoverageAnalysis]: Checked inductivity of 134 backedges. 36 proven. 49 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-12-27 21:37:46,900 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1720818300] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-27 21:37:46,900 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-27 21:37:46,901 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 26 [2021-12-27 21:37:46,901 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [438232276] [2021-12-27 21:37:46,901 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-27 21:37:46,901 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-12-27 21:37:46,901 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-27 21:37:46,901 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-12-27 21:37:46,901 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=165, Invalid=485, Unknown=0, NotChecked=0, Total=650 [2021-12-27 21:37:46,902 INFO L87 Difference]: Start difference. First operand 52 states and 54 transitions. Second operand has 26 states, 26 states have (on average 2.8461538461538463) internal successors, (74), 26 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-27 21:37:47,143 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-27 21:37:47,144 INFO L93 Difference]: Finished difference Result 60 states and 62 transitions. [2021-12-27 21:37:47,144 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-12-27 21:37:47,144 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.8461538461538463) internal successors, (74), 26 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 51 [2021-12-27 21:37:47,144 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-27 21:37:47,145 INFO L225 Difference]: With dead ends: 60 [2021-12-27 21:37:47,145 INFO L226 Difference]: Without dead ends: 56 [2021-12-27 21:37:47,145 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 93 SyntacticMatches, 2 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 427 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=353, Invalid=1207, Unknown=0, NotChecked=0, Total=1560 [2021-12-27 21:37:47,145 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 78 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 306 mSolverCounterSat, 69 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 78 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 375 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 69 IncrementalHoareTripleChecker+Valid, 306 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-27 21:37:47,145 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [78 Valid, 25 Invalid, 375 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [69 Valid, 306 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-27 21:37:47,146 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2021-12-27 21:37:47,154 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 54. [2021-12-27 21:37:47,155 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 53 states have (on average 1.0566037735849056) internal successors, (56), 53 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-27 21:37:47,155 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 56 transitions. [2021-12-27 21:37:47,155 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 56 transitions. Word has length 51 [2021-12-27 21:37:47,156 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-27 21:37:47,156 INFO L470 AbstractCegarLoop]: Abstraction has 54 states and 56 transitions. [2021-12-27 21:37:47,156 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 2.8461538461538463) internal successors, (74), 26 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-27 21:37:47,156 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 56 transitions. [2021-12-27 21:37:47,156 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-12-27 21:37:47,156 INFO L506 BasicCegarLoop]: Found error trace [2021-12-27 21:37:47,157 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-27 21:37:47,174 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-12-27 21:37:47,371 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,18 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-27 21:37:47,372 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-27 21:37:47,372 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-27 21:37:47,372 INFO L85 PathProgramCache]: Analyzing trace with hash -1158981530, now seen corresponding path program 18 times [2021-12-27 21:37:47,372 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-27 21:37:47,372 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [959050094] [2021-12-27 21:37:47,372 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-27 21:37:47,372 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-27 21:37:47,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:37:49,539 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 12 proven. 135 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-27 21:37:49,539 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-27 21:37:49,539 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [959050094] [2021-12-27 21:37:49,540 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [959050094] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-27 21:37:49,540 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1544999887] [2021-12-27 21:37:49,540 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-12-27 21:37:49,540 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-27 21:37:49,540 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-27 21:37:49,541 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) [2021-12-27 21:37:49,541 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-12-27 21:37:49,617 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 8 check-sat command(s) [2021-12-27 21:37:49,617 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-27 21:37:49,619 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 82 conjunts are in the unsatisfiable core [2021-12-27 21:37:49,620 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-27 21:37:49,695 INFO L387 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 15 treesize of output 11 [2021-12-27 21:37:52,235 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-27 21:37:52,238 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-27 21:37:52,238 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-27 21:37:52,241 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-27 21:37:52,247 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-27 21:37:52,248 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-27 21:37:52,250 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-27 21:37:52,251 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-27 21:37:52,253 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-27 21:37:52,253 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-27 21:37:52,254 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-27 21:37:52,254 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-27 21:37:52,255 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-27 21:37:52,257 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-27 21:37:52,257 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-27 21:37:52,259 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-27 21:37:52,261 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-27 21:37:52,263 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-27 21:37:52,265 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-27 21:37:52,266 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-27 21:37:52,267 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-27 21:37:52,268 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-27 21:37:52,269 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-27 21:37:52,269 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-27 21:37:52,271 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-27 21:37:52,272 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-27 21:37:52,273 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-27 21:37:52,274 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-27 21:37:52,275 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-27 21:37:52,277 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-27 21:37:52,437 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-27 21:37:52,438 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 12 select indices, 12 select index equivalence classes, 31 disjoint index pairs (out of 66 index pairs), introduced 12 new quantified variables, introduced 66 case distinctions, treesize of input 110 treesize of output 479 [2021-12-27 21:37:56,613 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 11 proven. 111 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-12-27 21:37:56,613 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-27 21:38:02,539 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 0 proven. 111 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-12-27 21:38:02,540 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1544999887] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-27 21:38:02,540 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-27 21:38:02,540 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 36, 33] total 106 [2021-12-27 21:38:02,540 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [630348756] [2021-12-27 21:38:02,540 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-27 21:38:02,540 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 106 states [2021-12-27 21:38:02,540 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-27 21:38:02,541 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 106 interpolants. [2021-12-27 21:38:02,541 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=681, Invalid=10449, Unknown=0, NotChecked=0, Total=11130 [2021-12-27 21:38:02,542 INFO L87 Difference]: Start difference. First operand 54 states and 56 transitions. Second operand has 106 states, 106 states have (on average 1.2358490566037736) internal successors, (131), 106 states have internal predecessors, (131), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-27 21:38:08,926 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-27 21:38:08,926 INFO L93 Difference]: Finished difference Result 77 states and 80 transitions. [2021-12-27 21:38:08,926 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2021-12-27 21:38:08,927 INFO L78 Accepts]: Start accepts. Automaton has has 106 states, 106 states have (on average 1.2358490566037736) internal successors, (131), 106 states have internal predecessors, (131), 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 53 [2021-12-27 21:38:08,927 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-27 21:38:08,927 INFO L225 Difference]: With dead ends: 77 [2021-12-27 21:38:08,927 INFO L226 Difference]: Without dead ends: 73 [2021-12-27 21:38:08,929 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 198 GetRequests, 42 SyntacticMatches, 5 SemanticMatches, 151 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4918 ImplicationChecksByTransitivity, 14.0s TimeCoverageRelationStatistics Valid=1448, Invalid=21808, Unknown=0, NotChecked=0, Total=23256 [2021-12-27 21:38:08,929 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 53 mSDsluCounter, 147 mSDsCounter, 0 mSdLazyCounter, 1434 mSolverCounterSat, 118 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 154 SdHoareTripleChecker+Invalid, 2524 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 118 IncrementalHoareTripleChecker+Valid, 1434 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 972 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-12-27 21:38:08,929 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [53 Valid, 154 Invalid, 2524 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [118 Valid, 1434 Invalid, 0 Unknown, 972 Unchecked, 0.7s Time] [2021-12-27 21:38:08,930 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2021-12-27 21:38:08,942 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 59. [2021-12-27 21:38:08,942 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 58 states have (on average 1.0689655172413792) internal successors, (62), 58 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-27 21:38:08,942 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 62 transitions. [2021-12-27 21:38:08,942 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 62 transitions. Word has length 53 [2021-12-27 21:38:08,942 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-27 21:38:08,943 INFO L470 AbstractCegarLoop]: Abstraction has 59 states and 62 transitions. [2021-12-27 21:38:08,943 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 106 states, 106 states have (on average 1.2358490566037736) internal successors, (131), 106 states have internal predecessors, (131), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-27 21:38:08,943 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 62 transitions. [2021-12-27 21:38:08,943 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-12-27 21:38:08,943 INFO L506 BasicCegarLoop]: Found error trace [2021-12-27 21:38:08,943 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-27 21:38:08,962 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Ended with exit code 0 [2021-12-27 21:38:09,143 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,19 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-27 21:38:09,144 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-27 21:38:09,144 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-27 21:38:09,144 INFO L85 PathProgramCache]: Analyzing trace with hash -1331487352, now seen corresponding path program 19 times [2021-12-27 21:38:09,144 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-27 21:38:09,144 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1630983858] [2021-12-27 21:38:09,144 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-27 21:38:09,144 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-27 21:38:09,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:38:09,279 INFO L134 CoverageAnalysis]: Checked inductivity of 162 backedges. 51 proven. 62 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-12-27 21:38:09,279 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-27 21:38:09,279 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1630983858] [2021-12-27 21:38:09,279 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1630983858] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-27 21:38:09,279 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [550951543] [2021-12-27 21:38:09,279 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-12-27 21:38:09,279 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-27 21:38:09,280 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-27 21:38:09,280 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) [2021-12-27 21:38:09,283 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-12-27 21:38:09,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 21:38:09,337 INFO L263 TraceCheckSpWp]: Trace formula consists of 187 conjuncts, 18 conjunts are in the unsatisfiable core [2021-12-27 21:38:09,338 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-27 21:38:09,534 INFO L134 CoverageAnalysis]: Checked inductivity of 162 backedges. 64 proven. 49 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-12-27 21:38:09,535 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-27 21:38:09,623 INFO L134 CoverageAnalysis]: Checked inductivity of 162 backedges. 64 proven. 49 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-12-27 21:38:09,623 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [550951543] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-27 21:38:09,623 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-27 21:38:09,623 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 29 [2021-12-27 21:38:09,623 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [997257315] [2021-12-27 21:38:09,623 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-27 21:38:09,623 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-12-27 21:38:09,623 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-27 21:38:09,624 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-12-27 21:38:09,624 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=203, Invalid=609, Unknown=0, NotChecked=0, Total=812 [2021-12-27 21:38:09,624 INFO L87 Difference]: Start difference. First operand 59 states and 62 transitions. Second operand has 29 states, 29 states have (on average 2.2413793103448274) internal successors, (65), 29 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-27 21:38:09,842 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-27 21:38:09,842 INFO L93 Difference]: Finished difference Result 122 states and 128 transitions. [2021-12-27 21:38:09,844 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-12-27 21:38:09,844 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 2.2413793103448274) internal successors, (65), 29 states have internal predecessors, (65), 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 55 [2021-12-27 21:38:09,844 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-27 21:38:09,845 INFO L225 Difference]: With dead ends: 122 [2021-12-27 21:38:09,845 INFO L226 Difference]: Without dead ends: 67 [2021-12-27 21:38:09,845 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 99 SyntacticMatches, 1 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 347 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=335, Invalid=997, Unknown=0, NotChecked=0, Total=1332 [2021-12-27 21:38:09,845 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 117 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 286 mSolverCounterSat, 114 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 117 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 400 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 114 IncrementalHoareTripleChecker+Valid, 286 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-27 21:38:09,846 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [117 Valid, 38 Invalid, 400 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [114 Valid, 286 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-27 21:38:09,846 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2021-12-27 21:38:09,857 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 58. [2021-12-27 21:38:09,857 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 57 states have (on average 1.0526315789473684) internal successors, (60), 57 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-27 21:38:09,857 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 60 transitions. [2021-12-27 21:38:09,857 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 60 transitions. Word has length 55 [2021-12-27 21:38:09,858 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-27 21:38:09,858 INFO L470 AbstractCegarLoop]: Abstraction has 58 states and 60 transitions. [2021-12-27 21:38:09,858 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 2.2413793103448274) internal successors, (65), 29 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-27 21:38:09,858 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 60 transitions. [2021-12-27 21:38:09,858 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-12-27 21:38:09,858 INFO L506 BasicCegarLoop]: Found error trace [2021-12-27 21:38:09,858 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-27 21:38:09,876 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0