./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/array-examples/relax-2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version c3fed411 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx15G -Xms4m -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/AutomizerReach.xml -i ../sv-benchmarks/c/array-examples/relax-2.i -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 d53812dd1177b266d0f37d9b3339dda1620cf3a3734db2ec7312de8297126685 --- Real Ultimate output --- This is Ultimate 0.2.2-tmp.no-commuhash-c3fed41 [2021-12-16 20:34:00,194 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-12-16 20:34:00,196 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-12-16 20:34:00,238 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-12-16 20:34:00,239 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-12-16 20:34:00,241 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-12-16 20:34:00,243 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-12-16 20:34:00,245 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-12-16 20:34:00,246 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-12-16 20:34:00,250 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-12-16 20:34:00,251 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-12-16 20:34:00,252 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-12-16 20:34:00,252 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-12-16 20:34:00,253 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-12-16 20:34:00,255 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-12-16 20:34:00,257 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-12-16 20:34:00,258 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-12-16 20:34:00,258 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-12-16 20:34:00,260 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-12-16 20:34:00,264 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-12-16 20:34:00,265 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-12-16 20:34:00,266 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-12-16 20:34:00,267 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-12-16 20:34:00,268 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-12-16 20:34:00,272 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-12-16 20:34:00,272 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-12-16 20:34:00,272 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-12-16 20:34:00,274 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-12-16 20:34:00,274 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-12-16 20:34:00,274 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-12-16 20:34:00,275 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-12-16 20:34:00,275 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-12-16 20:34:00,276 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-12-16 20:34:00,277 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-12-16 20:34:00,278 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-12-16 20:34:00,278 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-12-16 20:34:00,279 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-12-16 20:34:00,279 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-12-16 20:34:00,279 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-12-16 20:34:00,280 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-12-16 20:34:00,280 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-12-16 20:34:00,281 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2021-12-16 20:34:00,303 INFO L113 SettingsManager]: Loading preferences was successful [2021-12-16 20:34:00,303 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-12-16 20:34:00,304 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-12-16 20:34:00,304 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-12-16 20:34:00,305 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-12-16 20:34:00,305 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-12-16 20:34:00,305 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-12-16 20:34:00,306 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-12-16 20:34:00,306 INFO L138 SettingsManager]: * Use SBE=true [2021-12-16 20:34:00,306 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-12-16 20:34:00,306 INFO L138 SettingsManager]: * sizeof long=4 [2021-12-16 20:34:00,307 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-12-16 20:34:00,307 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-12-16 20:34:00,307 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-12-16 20:34:00,307 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-12-16 20:34:00,307 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-12-16 20:34:00,307 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-12-16 20:34:00,307 INFO L138 SettingsManager]: * sizeof long double=12 [2021-12-16 20:34:00,308 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-12-16 20:34:00,308 INFO L138 SettingsManager]: * Use constant arrays=true [2021-12-16 20:34:00,308 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-12-16 20:34:00,308 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-12-16 20:34:00,308 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-12-16 20:34:00,308 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-12-16 20:34:00,308 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-16 20:34:00,309 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-12-16 20:34:00,309 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-12-16 20:34:00,310 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-12-16 20:34:00,310 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-12-16 20:34:00,310 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-12-16 20:34:00,310 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-12-16 20:34:00,310 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-12-16 20:34:00,310 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-12-16 20:34:00,310 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-12-16 20:34:00,311 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> d53812dd1177b266d0f37d9b3339dda1620cf3a3734db2ec7312de8297126685 [2021-12-16 20:34:00,516 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-12-16 20:34:00,537 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-12-16 20:34:00,540 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-12-16 20:34:00,540 INFO L271 PluginConnector]: Initializing CDTParser... [2021-12-16 20:34:00,541 INFO L275 PluginConnector]: CDTParser initialized [2021-12-16 20:34:00,541 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/array-examples/relax-2.i [2021-12-16 20:34:00,599 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9fc31e3ba/7a3c0e3d6e304ac38d494caea2fb311d/FLAGeeffa77b6 [2021-12-16 20:34:00,957 INFO L306 CDTParser]: Found 1 translation units. [2021-12-16 20:34:00,957 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-examples/relax-2.i [2021-12-16 20:34:00,966 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9fc31e3ba/7a3c0e3d6e304ac38d494caea2fb311d/FLAGeeffa77b6 [2021-12-16 20:34:01,354 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9fc31e3ba/7a3c0e3d6e304ac38d494caea2fb311d [2021-12-16 20:34:01,357 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-12-16 20:34:01,358 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-12-16 20:34:01,359 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-12-16 20:34:01,360 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-12-16 20:34:01,362 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-12-16 20:34:01,362 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 16.12 08:34:01" (1/1) ... [2021-12-16 20:34:01,363 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5794e479 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.12 08:34:01, skipping insertion in model container [2021-12-16 20:34:01,363 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 16.12 08:34:01" (1/1) ... [2021-12-16 20:34:01,368 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-12-16 20:34:01,395 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-12-16 20:34:01,525 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-examples/relax-2.i[980,993] [2021-12-16 20:34:01,605 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-16 20:34:01,610 INFO L203 MainTranslator]: Completed pre-run [2021-12-16 20:34:01,621 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-examples/relax-2.i[980,993] [2021-12-16 20:34:01,660 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-16 20:34:01,679 INFO L208 MainTranslator]: Completed translation [2021-12-16 20:34:01,679 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.12 08:34:01 WrapperNode [2021-12-16 20:34:01,679 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-12-16 20:34:01,680 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-12-16 20:34:01,681 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-12-16 20:34:01,681 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-12-16 20:34:01,685 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.12 08:34:01" (1/1) ... [2021-12-16 20:34:01,698 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.12 08:34:01" (1/1) ... [2021-12-16 20:34:01,724 INFO L137 Inliner]: procedures = 120, calls = 26, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 135 [2021-12-16 20:34:01,730 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-12-16 20:34:01,731 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-12-16 20:34:01,731 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-12-16 20:34:01,731 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-12-16 20:34:01,737 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.12 08:34:01" (1/1) ... [2021-12-16 20:34:01,737 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.12 08:34:01" (1/1) ... [2021-12-16 20:34:01,743 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.12 08:34:01" (1/1) ... [2021-12-16 20:34:01,745 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.12 08:34:01" (1/1) ... [2021-12-16 20:34:01,754 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.12 08:34:01" (1/1) ... [2021-12-16 20:34:01,762 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.12 08:34:01" (1/1) ... [2021-12-16 20:34:01,764 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.12 08:34:01" (1/1) ... [2021-12-16 20:34:01,772 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-12-16 20:34:01,776 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-12-16 20:34:01,776 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-12-16 20:34:01,776 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-12-16 20:34:01,777 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.12 08:34:01" (1/1) ... [2021-12-16 20:34:01,782 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-16 20:34:01,793 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-16 20:34:01,804 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) [2021-12-16 20:34:01,827 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 [2021-12-16 20:34:01,839 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-12-16 20:34:01,839 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-12-16 20:34:01,840 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-12-16 20:34:01,840 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-12-16 20:34:01,840 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-12-16 20:34:01,840 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-12-16 20:34:01,843 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-12-16 20:34:01,843 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-12-16 20:34:01,843 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-12-16 20:34:01,843 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-12-16 20:34:01,843 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-12-16 20:34:01,918 INFO L236 CfgBuilder]: Building ICFG [2021-12-16 20:34:01,920 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-12-16 20:34:02,111 INFO L277 CfgBuilder]: Performing block encoding [2021-12-16 20:34:02,115 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-12-16 20:34:02,116 INFO L301 CfgBuilder]: Removed 5 assume(true) statements. [2021-12-16 20:34:02,117 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 16.12 08:34:02 BoogieIcfgContainer [2021-12-16 20:34:02,117 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-12-16 20:34:02,118 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-12-16 20:34:02,118 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-12-16 20:34:02,121 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-12-16 20:34:02,121 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 16.12 08:34:01" (1/3) ... [2021-12-16 20:34:02,122 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@488ca63d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 16.12 08:34:02, skipping insertion in model container [2021-12-16 20:34:02,122 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.12 08:34:01" (2/3) ... [2021-12-16 20:34:02,122 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@488ca63d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 16.12 08:34:02, skipping insertion in model container [2021-12-16 20:34:02,122 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 16.12 08:34:02" (3/3) ... [2021-12-16 20:34:02,123 INFO L111 eAbstractionObserver]: Analyzing ICFG relax-2.i [2021-12-16 20:34:02,127 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-12-16 20:34:02,127 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-12-16 20:34:02,161 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-12-16 20:34:02,166 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 [2021-12-16 20:34:02,166 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-12-16 20:34:02,183 INFO L276 IsEmpty]: Start isEmpty. Operand has 51 states, 42 states have (on average 1.5952380952380953) internal successors, (67), 44 states have internal predecessors, (67), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-12-16 20:34:02,186 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-12-16 20:34:02,186 INFO L506 BasicCegarLoop]: Found error trace [2021-12-16 20:34:02,186 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-16 20:34:02,187 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-16 20:34:02,190 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-16 20:34:02,191 INFO L85 PathProgramCache]: Analyzing trace with hash 229348008, now seen corresponding path program 1 times [2021-12-16 20:34:02,197 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-16 20:34:02,198 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [450784739] [2021-12-16 20:34:02,198 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 20:34:02,199 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-16 20:34:02,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:34:02,427 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-16 20:34:02,427 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-16 20:34:02,427 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [450784739] [2021-12-16 20:34:02,428 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [450784739] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-16 20:34:02,428 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-16 20:34:02,428 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-12-16 20:34:02,430 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1605848515] [2021-12-16 20:34:02,430 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-16 20:34:02,433 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-12-16 20:34:02,434 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-16 20:34:02,456 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-12-16 20:34:02,457 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-12-16 20:34:02,459 INFO L87 Difference]: Start difference. First operand has 51 states, 42 states have (on average 1.5952380952380953) internal successors, (67), 44 states have internal predecessors, (67), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Second operand has 4 states, 4 states have (on average 3.0) internal successors, (12), 4 states have internal predecessors, (12), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-16 20:34:02,518 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-16 20:34:02,518 INFO L93 Difference]: Finished difference Result 110 states and 172 transitions. [2021-12-16 20:34:02,520 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-12-16 20:34:02,520 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 4 states have internal predecessors, (12), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2021-12-16 20:34:02,521 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-16 20:34:02,526 INFO L225 Difference]: With dead ends: 110 [2021-12-16 20:34:02,526 INFO L226 Difference]: Without dead ends: 55 [2021-12-16 20:34:02,530 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-12-16 20:34:02,532 INFO L933 BasicCegarLoop]: 69 mSDtfsCounter, 13 mSDsluCounter, 131 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 200 SdHoareTripleChecker+Invalid, 12 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 9 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-16 20:34:02,533 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 200 Invalid, 12 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 9 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-16 20:34:02,545 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2021-12-16 20:34:02,562 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 49. [2021-12-16 20:34:02,563 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 41 states have (on average 1.3902439024390243) internal successors, (57), 42 states have internal predecessors, (57), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-12-16 20:34:02,564 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 66 transitions. [2021-12-16 20:34:02,565 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 66 transitions. Word has length 13 [2021-12-16 20:34:02,566 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-16 20:34:02,566 INFO L470 AbstractCegarLoop]: Abstraction has 49 states and 66 transitions. [2021-12-16 20:34:02,566 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 4 states have internal predecessors, (12), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-16 20:34:02,566 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 66 transitions. [2021-12-16 20:34:02,567 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-12-16 20:34:02,567 INFO L506 BasicCegarLoop]: Found error trace [2021-12-16 20:34:02,567 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-16 20:34:02,567 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-12-16 20:34:02,568 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-16 20:34:02,570 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-16 20:34:02,570 INFO L85 PathProgramCache]: Analyzing trace with hash -1753731807, now seen corresponding path program 1 times [2021-12-16 20:34:02,570 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-16 20:34:02,570 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [642631138] [2021-12-16 20:34:02,570 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 20:34:02,571 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-16 20:34:02,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:34:02,694 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-16 20:34:02,694 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-16 20:34:02,695 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [642631138] [2021-12-16 20:34:02,695 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [642631138] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-16 20:34:02,695 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-16 20:34:02,695 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-12-16 20:34:02,695 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1275605667] [2021-12-16 20:34:02,696 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-16 20:34:02,697 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-12-16 20:34:02,698 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-16 20:34:02,698 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-12-16 20:34:02,698 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-12-16 20:34:02,699 INFO L87 Difference]: Start difference. First operand 49 states and 66 transitions. Second operand has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-16 20:34:02,804 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-16 20:34:02,804 INFO L93 Difference]: Finished difference Result 105 states and 141 transitions. [2021-12-16 20:34:02,805 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-12-16 20:34:02,805 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2021-12-16 20:34:02,805 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-16 20:34:02,806 INFO L225 Difference]: With dead ends: 105 [2021-12-16 20:34:02,807 INFO L226 Difference]: Without dead ends: 69 [2021-12-16 20:34:02,810 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-12-16 20:34:02,812 INFO L933 BasicCegarLoop]: 54 mSDtfsCounter, 50 mSDsluCounter, 211 mSDsCounter, 0 mSdLazyCounter, 55 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 265 SdHoareTripleChecker+Invalid, 62 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 55 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-16 20:34:02,812 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [50 Valid, 265 Invalid, 62 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 55 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-16 20:34:02,814 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2021-12-16 20:34:02,826 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 65. [2021-12-16 20:34:02,826 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 57 states have (on average 1.4035087719298245) internal successors, (80), 58 states have internal predecessors, (80), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-12-16 20:34:02,829 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 89 transitions. [2021-12-16 20:34:02,829 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 89 transitions. Word has length 15 [2021-12-16 20:34:02,831 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-16 20:34:02,832 INFO L470 AbstractCegarLoop]: Abstraction has 65 states and 89 transitions. [2021-12-16 20:34:02,832 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-16 20:34:02,833 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 89 transitions. [2021-12-16 20:34:02,833 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-12-16 20:34:02,833 INFO L506 BasicCegarLoop]: Found error trace [2021-12-16 20:34:02,833 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-16 20:34:02,833 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-12-16 20:34:02,833 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-16 20:34:02,834 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-16 20:34:02,834 INFO L85 PathProgramCache]: Analyzing trace with hash 404200823, now seen corresponding path program 1 times [2021-12-16 20:34:02,834 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-16 20:34:02,834 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1207173044] [2021-12-16 20:34:02,834 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 20:34:02,834 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-16 20:34:02,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:34:02,943 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-16 20:34:02,944 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-16 20:34:02,944 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1207173044] [2021-12-16 20:34:02,944 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1207173044] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-16 20:34:02,944 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-16 20:34:02,944 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-12-16 20:34:02,945 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [412699618] [2021-12-16 20:34:02,945 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-16 20:34:02,945 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-12-16 20:34:02,946 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-16 20:34:02,946 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-12-16 20:34:02,946 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-12-16 20:34:02,946 INFO L87 Difference]: Start difference. First operand 65 states and 89 transitions. Second operand has 5 states, 5 states have (on average 3.0) internal successors, (15), 5 states have internal predecessors, (15), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-16 20:34:02,998 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-16 20:34:02,998 INFO L93 Difference]: Finished difference Result 81 states and 106 transitions. [2021-12-16 20:34:02,999 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-12-16 20:34:02,999 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 5 states have internal predecessors, (15), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2021-12-16 20:34:02,999 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-16 20:34:03,001 INFO L225 Difference]: With dead ends: 81 [2021-12-16 20:34:03,001 INFO L226 Difference]: Without dead ends: 64 [2021-12-16 20:34:03,002 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-12-16 20:34:03,006 INFO L933 BasicCegarLoop]: 54 mSDtfsCounter, 34 mSDsluCounter, 115 mSDsCounter, 0 mSdLazyCounter, 27 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 169 SdHoareTripleChecker+Invalid, 29 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 27 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-16 20:34:03,007 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [34 Valid, 169 Invalid, 29 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 27 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-16 20:34:03,008 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2021-12-16 20:34:03,017 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 62. [2021-12-16 20:34:03,018 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 54 states have (on average 1.3333333333333333) internal successors, (72), 55 states have internal predecessors, (72), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-12-16 20:34:03,019 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 81 transitions. [2021-12-16 20:34:03,019 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 81 transitions. Word has length 16 [2021-12-16 20:34:03,019 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-16 20:34:03,019 INFO L470 AbstractCegarLoop]: Abstraction has 62 states and 81 transitions. [2021-12-16 20:34:03,020 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 5 states have internal predecessors, (15), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-16 20:34:03,021 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 81 transitions. [2021-12-16 20:34:03,021 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-12-16 20:34:03,021 INFO L506 BasicCegarLoop]: Found error trace [2021-12-16 20:34:03,022 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-16 20:34:03,022 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-12-16 20:34:03,022 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-16 20:34:03,023 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-16 20:34:03,023 INFO L85 PathProgramCache]: Analyzing trace with hash -1831341089, now seen corresponding path program 1 times [2021-12-16 20:34:03,023 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-16 20:34:03,023 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1873133774] [2021-12-16 20:34:03,023 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 20:34:03,023 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-16 20:34:03,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:34:03,218 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-16 20:34:03,219 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-16 20:34:03,219 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1873133774] [2021-12-16 20:34:03,219 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1873133774] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-16 20:34:03,219 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [637865516] [2021-12-16 20:34:03,220 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 20:34:03,220 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-16 20:34:03,220 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-16 20:34:03,221 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) [2021-12-16 20:34:03,225 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-12-16 20:34:03,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:34:03,274 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 12 conjunts are in the unsatisfiable core [2021-12-16 20:34:03,278 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-16 20:34:03,431 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-16 20:34:03,431 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-16 20:34:03,431 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [637865516] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-16 20:34:03,432 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-12-16 20:34:03,432 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [9] total 12 [2021-12-16 20:34:03,432 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [941926182] [2021-12-16 20:34:03,432 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-16 20:34:03,433 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-12-16 20:34:03,433 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-16 20:34:03,433 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-12-16 20:34:03,433 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=107, Unknown=0, NotChecked=0, Total=132 [2021-12-16 20:34:03,433 INFO L87 Difference]: Start difference. First operand 62 states and 81 transitions. Second operand has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-16 20:34:03,500 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-16 20:34:03,501 INFO L93 Difference]: Finished difference Result 71 states and 89 transitions. [2021-12-16 20:34:03,501 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-16 20:34:03,501 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 17 [2021-12-16 20:34:03,501 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-16 20:34:03,502 INFO L225 Difference]: With dead ends: 71 [2021-12-16 20:34:03,502 INFO L226 Difference]: Without dead ends: 69 [2021-12-16 20:34:03,502 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2021-12-16 20:34:03,503 INFO L933 BasicCegarLoop]: 47 mSDtfsCounter, 76 mSDsluCounter, 123 mSDsCounter, 0 mSdLazyCounter, 69 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 76 SdHoareTripleChecker+Valid, 170 SdHoareTripleChecker+Invalid, 78 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 69 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-16 20:34:03,503 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [76 Valid, 170 Invalid, 78 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 69 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-16 20:34:03,504 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2021-12-16 20:34:03,508 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 66. [2021-12-16 20:34:03,508 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 57 states have (on average 1.3157894736842106) internal successors, (75), 58 states have internal predecessors, (75), 5 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-12-16 20:34:03,508 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 84 transitions. [2021-12-16 20:34:03,509 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 84 transitions. Word has length 17 [2021-12-16 20:34:03,509 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-16 20:34:03,509 INFO L470 AbstractCegarLoop]: Abstraction has 66 states and 84 transitions. [2021-12-16 20:34:03,509 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-16 20:34:03,509 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 84 transitions. [2021-12-16 20:34:03,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-12-16 20:34:03,510 INFO L506 BasicCegarLoop]: Found error trace [2021-12-16 20:34:03,510 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-16 20:34:03,529 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-12-16 20:34:03,719 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 [2021-12-16 20:34:03,720 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-16 20:34:03,720 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-16 20:34:03,720 INFO L85 PathProgramCache]: Analyzing trace with hash -251411362, now seen corresponding path program 1 times [2021-12-16 20:34:03,720 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-16 20:34:03,720 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [959849794] [2021-12-16 20:34:03,720 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 20:34:03,721 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-16 20:34:03,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:34:03,754 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-16 20:34:03,771 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-16 20:34:03,771 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [959849794] [2021-12-16 20:34:03,771 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [959849794] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-16 20:34:03,772 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-16 20:34:03,772 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-12-16 20:34:03,772 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1053273952] [2021-12-16 20:34:03,772 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-16 20:34:03,772 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-12-16 20:34:03,772 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-16 20:34:03,773 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-12-16 20:34:03,773 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-12-16 20:34:03,773 INFO L87 Difference]: Start difference. First operand 66 states and 84 transitions. Second operand has 4 states, 4 states have (on average 4.25) internal successors, (17), 4 states have internal predecessors, (17), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-16 20:34:03,788 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-16 20:34:03,788 INFO L93 Difference]: Finished difference Result 78 states and 98 transitions. [2021-12-16 20:34:03,789 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-12-16 20:34:03,789 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.25) internal successors, (17), 4 states have internal predecessors, (17), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2021-12-16 20:34:03,789 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-16 20:34:03,790 INFO L225 Difference]: With dead ends: 78 [2021-12-16 20:34:03,790 INFO L226 Difference]: Without dead ends: 54 [2021-12-16 20:34:03,790 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-12-16 20:34:03,791 INFO L933 BasicCegarLoop]: 62 mSDtfsCounter, 16 mSDsluCounter, 98 mSDsCounter, 0 mSdLazyCounter, 11 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 160 SdHoareTripleChecker+Invalid, 12 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 11 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-16 20:34:03,791 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 160 Invalid, 12 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 11 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-16 20:34:03,791 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-12-16 20:34:03,797 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2021-12-16 20:34:03,799 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 45 states have (on average 1.3333333333333333) internal successors, (60), 46 states have internal predecessors, (60), 5 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-12-16 20:34:03,799 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 69 transitions. [2021-12-16 20:34:03,800 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 69 transitions. Word has length 18 [2021-12-16 20:34:03,800 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-16 20:34:03,800 INFO L470 AbstractCegarLoop]: Abstraction has 54 states and 69 transitions. [2021-12-16 20:34:03,800 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 4.25) internal successors, (17), 4 states have internal predecessors, (17), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-16 20:34:03,801 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 69 transitions. [2021-12-16 20:34:03,801 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-12-16 20:34:03,801 INFO L506 BasicCegarLoop]: Found error trace [2021-12-16 20:34:03,802 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-16 20:34:03,802 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-12-16 20:34:03,802 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-16 20:34:03,802 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-16 20:34:03,802 INFO L85 PathProgramCache]: Analyzing trace with hash -2003533961, now seen corresponding path program 1 times [2021-12-16 20:34:03,803 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-16 20:34:03,803 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [71657412] [2021-12-16 20:34:03,803 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 20:34:03,803 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-16 20:34:03,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:34:03,936 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-16 20:34:03,937 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-16 20:34:03,937 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [71657412] [2021-12-16 20:34:03,937 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [71657412] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-16 20:34:03,937 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1273553182] [2021-12-16 20:34:03,937 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 20:34:03,937 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-16 20:34:03,938 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-16 20:34:03,954 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) [2021-12-16 20:34:03,955 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-12-16 20:34:03,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:34:03,998 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 10 conjunts are in the unsatisfiable core [2021-12-16 20:34:03,999 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-16 20:34:04,074 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-16 20:34:04,075 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-16 20:34:04,075 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1273553182] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-16 20:34:04,075 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-12-16 20:34:04,075 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [9] total 10 [2021-12-16 20:34:04,075 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [579872376] [2021-12-16 20:34:04,076 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-16 20:34:04,076 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-12-16 20:34:04,076 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-16 20:34:04,076 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-12-16 20:34:04,076 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2021-12-16 20:34:04,077 INFO L87 Difference]: Start difference. First operand 54 states and 69 transitions. Second operand has 4 states, 4 states have (on average 4.25) internal successors, (17), 4 states have internal predecessors, (17), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-16 20:34:04,126 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-16 20:34:04,126 INFO L93 Difference]: Finished difference Result 68 states and 85 transitions. [2021-12-16 20:34:04,127 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-12-16 20:34:04,127 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.25) internal successors, (17), 4 states have internal predecessors, (17), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2021-12-16 20:34:04,127 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-16 20:34:04,127 INFO L225 Difference]: With dead ends: 68 [2021-12-16 20:34:04,127 INFO L226 Difference]: Without dead ends: 54 [2021-12-16 20:34:04,128 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 17 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2021-12-16 20:34:04,130 INFO L933 BasicCegarLoop]: 50 mSDtfsCounter, 39 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 107 SdHoareTripleChecker+Invalid, 42 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-16 20:34:04,130 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [43 Valid, 107 Invalid, 42 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 42 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-16 20:34:04,131 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-12-16 20:34:04,136 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2021-12-16 20:34:04,136 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 45 states have (on average 1.3111111111111111) internal successors, (59), 46 states have internal predecessors, (59), 5 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-12-16 20:34:04,137 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 68 transitions. [2021-12-16 20:34:04,137 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 68 transitions. Word has length 18 [2021-12-16 20:34:04,137 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-16 20:34:04,137 INFO L470 AbstractCegarLoop]: Abstraction has 54 states and 68 transitions. [2021-12-16 20:34:04,137 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 4.25) internal successors, (17), 4 states have internal predecessors, (17), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-16 20:34:04,137 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 68 transitions. [2021-12-16 20:34:04,140 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-12-16 20:34:04,141 INFO L506 BasicCegarLoop]: Found error trace [2021-12-16 20:34:04,141 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-16 20:34:04,158 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-12-16 20:34:04,355 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-12-16 20:34:04,355 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-16 20:34:04,356 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-16 20:34:04,356 INFO L85 PathProgramCache]: Analyzing trace with hash -1225946208, now seen corresponding path program 1 times [2021-12-16 20:34:04,356 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-16 20:34:04,356 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2120062991] [2021-12-16 20:34:04,356 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 20:34:04,356 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-16 20:34:04,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:34:04,376 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-16 20:34:04,377 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-16 20:34:04,377 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2120062991] [2021-12-16 20:34:04,377 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2120062991] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-16 20:34:04,377 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-16 20:34:04,377 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-12-16 20:34:04,378 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1093967096] [2021-12-16 20:34:04,378 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-16 20:34:04,378 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-16 20:34:04,378 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-16 20:34:04,378 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-16 20:34:04,379 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-16 20:34:04,379 INFO L87 Difference]: Start difference. First operand 54 states and 68 transitions. Second operand has 3 states, 3 states have (on average 6.333333333333333) internal successors, (19), 3 states have internal predecessors, (19), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-16 20:34:04,390 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-16 20:34:04,391 INFO L93 Difference]: Finished difference Result 90 states and 118 transitions. [2021-12-16 20:34:04,391 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-16 20:34:04,391 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 6.333333333333333) internal successors, (19), 3 states have internal predecessors, (19), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-12-16 20:34:04,391 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-16 20:34:04,392 INFO L225 Difference]: With dead ends: 90 [2021-12-16 20:34:04,392 INFO L226 Difference]: Without dead ends: 76 [2021-12-16 20:34:04,392 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 [2021-12-16 20:34:04,393 INFO L933 BasicCegarLoop]: 64 mSDtfsCounter, 22 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 120 SdHoareTripleChecker+Invalid, 10 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 9 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-16 20:34:04,393 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [26 Valid, 120 Invalid, 10 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 9 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-16 20:34:04,394 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2021-12-16 20:34:04,399 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 59. [2021-12-16 20:34:04,400 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 50 states have (on average 1.32) internal successors, (66), 51 states have internal predecessors, (66), 5 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-12-16 20:34:04,400 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 75 transitions. [2021-12-16 20:34:04,400 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 75 transitions. Word has length 20 [2021-12-16 20:34:04,400 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-16 20:34:04,400 INFO L470 AbstractCegarLoop]: Abstraction has 59 states and 75 transitions. [2021-12-16 20:34:04,401 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 6.333333333333333) internal successors, (19), 3 states have internal predecessors, (19), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-16 20:34:04,401 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 75 transitions. [2021-12-16 20:34:04,401 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-12-16 20:34:04,401 INFO L506 BasicCegarLoop]: Found error trace [2021-12-16 20:34:04,401 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-16 20:34:04,401 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-12-16 20:34:04,402 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-16 20:34:04,402 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-16 20:34:04,402 INFO L85 PathProgramCache]: Analyzing trace with hash -1055739498, now seen corresponding path program 1 times [2021-12-16 20:34:04,402 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-16 20:34:04,402 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1226868182] [2021-12-16 20:34:04,402 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 20:34:04,403 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-16 20:34:04,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:34:04,516 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-16 20:34:04,517 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-16 20:34:04,517 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1226868182] [2021-12-16 20:34:04,517 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1226868182] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-16 20:34:04,517 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [57362634] [2021-12-16 20:34:04,517 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 20:34:04,517 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-16 20:34:04,517 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-16 20:34:04,518 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) [2021-12-16 20:34:04,520 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-12-16 20:34:04,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:34:04,574 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 12 conjunts are in the unsatisfiable core [2021-12-16 20:34:04,576 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-16 20:34:04,639 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-16 20:34:04,640 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-16 20:34:04,640 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [57362634] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-16 20:34:04,640 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-12-16 20:34:04,640 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [8] total 10 [2021-12-16 20:34:04,640 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1749692120] [2021-12-16 20:34:04,641 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-16 20:34:04,641 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-12-16 20:34:04,641 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-16 20:34:04,641 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-12-16 20:34:04,642 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2021-12-16 20:34:04,642 INFO L87 Difference]: Start difference. First operand 59 states and 75 transitions. Second operand has 6 states, 6 states have (on average 3.8333333333333335) internal successors, (23), 6 states have internal predecessors, (23), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-16 20:34:04,710 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-16 20:34:04,711 INFO L93 Difference]: Finished difference Result 121 states and 155 transitions. [2021-12-16 20:34:04,711 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-16 20:34:04,711 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.8333333333333335) internal successors, (23), 6 states have internal predecessors, (23), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-12-16 20:34:04,711 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-16 20:34:04,712 INFO L225 Difference]: With dead ends: 121 [2021-12-16 20:34:04,712 INFO L226 Difference]: Without dead ends: 61 [2021-12-16 20:34:04,714 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=40, Invalid=116, Unknown=0, NotChecked=0, Total=156 [2021-12-16 20:34:04,715 INFO L933 BasicCegarLoop]: 55 mSDtfsCounter, 31 mSDsluCounter, 215 mSDsCounter, 0 mSdLazyCounter, 45 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 270 SdHoareTripleChecker+Invalid, 49 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 45 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-16 20:34:04,715 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [31 Valid, 270 Invalid, 49 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 45 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-16 20:34:04,715 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2021-12-16 20:34:04,718 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 60. [2021-12-16 20:34:04,719 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 51 states have (on average 1.3137254901960784) internal successors, (67), 52 states have internal predecessors, (67), 5 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-12-16 20:34:04,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 76 transitions. [2021-12-16 20:34:04,720 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 76 transitions. Word has length 24 [2021-12-16 20:34:04,720 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-16 20:34:04,720 INFO L470 AbstractCegarLoop]: Abstraction has 60 states and 76 transitions. [2021-12-16 20:34:04,720 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.8333333333333335) internal successors, (23), 6 states have internal predecessors, (23), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-16 20:34:04,721 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 76 transitions. [2021-12-16 20:34:04,724 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-12-16 20:34:04,724 INFO L506 BasicCegarLoop]: Found error trace [2021-12-16 20:34:04,724 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-16 20:34:04,743 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-12-16 20:34:04,943 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-16 20:34:04,944 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-16 20:34:04,944 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-16 20:34:04,944 INFO L85 PathProgramCache]: Analyzing trace with hash -458147624, now seen corresponding path program 1 times [2021-12-16 20:34:04,944 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-16 20:34:04,944 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [530271754] [2021-12-16 20:34:04,944 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 20:34:04,945 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-16 20:34:04,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:34:04,996 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-16 20:34:04,996 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-16 20:34:04,997 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [530271754] [2021-12-16 20:34:04,997 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [530271754] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-16 20:34:04,997 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1304140715] [2021-12-16 20:34:04,997 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 20:34:04,997 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-16 20:34:04,997 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-16 20:34:05,008 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) [2021-12-16 20:34:05,009 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-12-16 20:34:05,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:34:05,057 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 14 conjunts are in the unsatisfiable core [2021-12-16 20:34:05,058 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-16 20:34:05,210 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-16 20:34:05,210 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-16 20:34:05,349 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-16 20:34:05,350 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1304140715] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-16 20:34:05,350 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-16 20:34:05,350 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7, 10] total 15 [2021-12-16 20:34:05,350 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [683219094] [2021-12-16 20:34:05,350 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-16 20:34:05,351 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-12-16 20:34:05,351 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-16 20:34:05,351 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-12-16 20:34:05,351 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2021-12-16 20:34:05,351 INFO L87 Difference]: Start difference. First operand 60 states and 76 transitions. Second operand has 15 states, 14 states have (on average 3.7142857142857144) internal successors, (52), 14 states have internal predecessors, (52), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-16 20:34:05,501 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-16 20:34:05,502 INFO L93 Difference]: Finished difference Result 145 states and 193 transitions. [2021-12-16 20:34:05,502 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-12-16 20:34:05,502 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 3.7142857142857144) internal successors, (52), 14 states have internal predecessors, (52), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 26 [2021-12-16 20:34:05,502 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-16 20:34:05,503 INFO L225 Difference]: With dead ends: 145 [2021-12-16 20:34:05,503 INFO L226 Difference]: Without dead ends: 122 [2021-12-16 20:34:05,503 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 40 SyntacticMatches, 3 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 50 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=69, Invalid=237, Unknown=0, NotChecked=0, Total=306 [2021-12-16 20:34:05,505 INFO L933 BasicCegarLoop]: 59 mSDtfsCounter, 236 mSDsluCounter, 509 mSDsCounter, 0 mSdLazyCounter, 175 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 239 SdHoareTripleChecker+Valid, 568 SdHoareTripleChecker+Invalid, 206 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 175 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-16 20:34:05,505 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [239 Valid, 568 Invalid, 206 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 175 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-16 20:34:05,505 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2021-12-16 20:34:05,510 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 90. [2021-12-16 20:34:05,510 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 80 states have (on average 1.325) internal successors, (106), 81 states have internal predecessors, (106), 6 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-12-16 20:34:05,511 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 117 transitions. [2021-12-16 20:34:05,511 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 117 transitions. Word has length 26 [2021-12-16 20:34:05,511 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-16 20:34:05,511 INFO L470 AbstractCegarLoop]: Abstraction has 90 states and 117 transitions. [2021-12-16 20:34:05,511 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 3.7142857142857144) internal successors, (52), 14 states have internal predecessors, (52), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-16 20:34:05,511 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 117 transitions. [2021-12-16 20:34:05,512 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-12-16 20:34:05,515 INFO L506 BasicCegarLoop]: Found error trace [2021-12-16 20:34:05,515 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-16 20:34:05,534 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-12-16 20:34:05,723 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-16 20:34:05,723 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-16 20:34:05,724 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-16 20:34:05,724 INFO L85 PathProgramCache]: Analyzing trace with hash -456300582, now seen corresponding path program 1 times [2021-12-16 20:34:05,724 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-16 20:34:05,724 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1261055950] [2021-12-16 20:34:05,724 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 20:34:05,724 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-16 20:34:05,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:34:05,815 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-16 20:34:05,815 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-16 20:34:05,815 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1261055950] [2021-12-16 20:34:05,815 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1261055950] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-16 20:34:05,816 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1214761020] [2021-12-16 20:34:05,816 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 20:34:05,816 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-16 20:34:05,816 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-16 20:34:05,817 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) [2021-12-16 20:34:05,818 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-12-16 20:34:05,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:34:05,867 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 10 conjunts are in the unsatisfiable core [2021-12-16 20:34:05,868 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-16 20:34:05,926 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-16 20:34:05,926 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-16 20:34:05,926 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1214761020] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-16 20:34:05,927 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-12-16 20:34:05,928 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [7] total 9 [2021-12-16 20:34:05,928 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [206188282] [2021-12-16 20:34:05,928 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-16 20:34:05,928 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-12-16 20:34:05,928 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-16 20:34:05,929 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-12-16 20:34:05,929 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-12-16 20:34:05,929 INFO L87 Difference]: Start difference. First operand 90 states and 117 transitions. Second operand has 4 states, 4 states have (on average 6.25) internal successors, (25), 4 states have internal predecessors, (25), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-16 20:34:05,975 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-16 20:34:05,976 INFO L93 Difference]: Finished difference Result 124 states and 161 transitions. [2021-12-16 20:34:05,976 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-12-16 20:34:05,976 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 6.25) internal successors, (25), 4 states have internal predecessors, (25), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 26 [2021-12-16 20:34:05,976 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-16 20:34:05,977 INFO L225 Difference]: With dead ends: 124 [2021-12-16 20:34:05,977 INFO L226 Difference]: Without dead ends: 110 [2021-12-16 20:34:05,977 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2021-12-16 20:34:05,978 INFO L933 BasicCegarLoop]: 69 mSDtfsCounter, 55 mSDsluCounter, 65 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 59 SdHoareTripleChecker+Valid, 134 SdHoareTripleChecker+Invalid, 47 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-16 20:34:05,978 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [59 Valid, 134 Invalid, 47 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 39 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-16 20:34:05,978 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2021-12-16 20:34:05,982 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 96. [2021-12-16 20:34:05,983 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 96 states, 86 states have (on average 1.313953488372093) internal successors, (113), 87 states have internal predecessors, (113), 6 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-12-16 20:34:05,983 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 124 transitions. [2021-12-16 20:34:05,983 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 124 transitions. Word has length 26 [2021-12-16 20:34:05,983 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-16 20:34:05,983 INFO L470 AbstractCegarLoop]: Abstraction has 96 states and 124 transitions. [2021-12-16 20:34:05,984 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 6.25) internal successors, (25), 4 states have internal predecessors, (25), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-16 20:34:05,984 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 124 transitions. [2021-12-16 20:34:05,984 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-12-16 20:34:05,984 INFO L506 BasicCegarLoop]: Found error trace [2021-12-16 20:34:05,984 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-16 20:34:06,005 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-12-16 20:34:06,201 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-12-16 20:34:06,201 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-16 20:34:06,202 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-16 20:34:06,202 INFO L85 PathProgramCache]: Analyzing trace with hash -993450261, now seen corresponding path program 1 times [2021-12-16 20:34:06,202 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-16 20:34:06,202 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1645395722] [2021-12-16 20:34:06,202 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 20:34:06,202 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-16 20:34:06,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:34:06,293 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-16 20:34:06,293 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-16 20:34:06,293 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1645395722] [2021-12-16 20:34:06,293 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1645395722] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-16 20:34:06,293 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2130930206] [2021-12-16 20:34:06,293 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 20:34:06,294 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-16 20:34:06,294 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-16 20:34:06,308 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) [2021-12-16 20:34:06,309 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-12-16 20:34:06,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:34:06,358 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 14 conjunts are in the unsatisfiable core [2021-12-16 20:34:06,360 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-16 20:34:06,437 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-16 20:34:06,437 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-16 20:34:06,527 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-16 20:34:06,527 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2130930206] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-16 20:34:06,527 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-16 20:34:06,527 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8, 8] total 17 [2021-12-16 20:34:06,528 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [498368274] [2021-12-16 20:34:06,528 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-16 20:34:06,528 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-12-16 20:34:06,528 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-16 20:34:06,528 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-12-16 20:34:06,529 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=226, Unknown=0, NotChecked=0, Total=272 [2021-12-16 20:34:06,529 INFO L87 Difference]: Start difference. First operand 96 states and 124 transitions. Second operand has 17 states, 17 states have (on average 3.235294117647059) internal successors, (55), 17 states have internal predecessors, (55), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-16 20:34:06,863 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-16 20:34:06,863 INFO L93 Difference]: Finished difference Result 177 states and 231 transitions. [2021-12-16 20:34:06,864 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-12-16 20:34:06,864 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 3.235294117647059) internal successors, (55), 17 states have internal predecessors, (55), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 27 [2021-12-16 20:34:06,864 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-16 20:34:06,864 INFO L225 Difference]: With dead ends: 177 [2021-12-16 20:34:06,865 INFO L226 Difference]: Without dead ends: 127 [2021-12-16 20:34:06,865 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 106 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=135, Invalid=515, Unknown=0, NotChecked=0, Total=650 [2021-12-16 20:34:06,865 INFO L933 BasicCegarLoop]: 68 mSDtfsCounter, 313 mSDsluCounter, 483 mSDsCounter, 0 mSdLazyCounter, 307 mSolverCounterSat, 66 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 317 SdHoareTripleChecker+Valid, 551 SdHoareTripleChecker+Invalid, 373 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 66 IncrementalHoareTripleChecker+Valid, 307 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-16 20:34:06,866 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [317 Valid, 551 Invalid, 373 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [66 Valid, 307 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-16 20:34:06,866 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2021-12-16 20:34:06,870 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 88. [2021-12-16 20:34:06,871 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 78 states have (on average 1.2820512820512822) internal successors, (100), 79 states have internal predecessors, (100), 6 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-12-16 20:34:06,871 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 111 transitions. [2021-12-16 20:34:06,871 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 111 transitions. Word has length 27 [2021-12-16 20:34:06,872 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-16 20:34:06,872 INFO L470 AbstractCegarLoop]: Abstraction has 88 states and 111 transitions. [2021-12-16 20:34:06,872 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 3.235294117647059) internal successors, (55), 17 states have internal predecessors, (55), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-16 20:34:06,872 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 111 transitions. [2021-12-16 20:34:06,872 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-12-16 20:34:06,873 INFO L506 BasicCegarLoop]: Found error trace [2021-12-16 20:34:06,873 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-16 20:34:06,891 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-12-16 20:34:07,087 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-16 20:34:07,087 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-16 20:34:07,088 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-16 20:34:07,088 INFO L85 PathProgramCache]: Analyzing trace with hash 1669286615, now seen corresponding path program 1 times [2021-12-16 20:34:07,088 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-16 20:34:07,088 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [102840638] [2021-12-16 20:34:07,088 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 20:34:07,088 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-16 20:34:07,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:34:07,165 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-12-16 20:34:07,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:34:07,169 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-16 20:34:07,169 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-16 20:34:07,169 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [102840638] [2021-12-16 20:34:07,169 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [102840638] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-16 20:34:07,169 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1958444815] [2021-12-16 20:34:07,169 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 20:34:07,170 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-16 20:34:07,170 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-16 20:34:07,171 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) [2021-12-16 20:34:07,172 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-12-16 20:34:07,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:34:07,216 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 17 conjunts are in the unsatisfiable core [2021-12-16 20:34:07,217 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-16 20:34:07,353 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-12-16 20:34:07,354 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-16 20:34:07,354 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1958444815] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-16 20:34:07,354 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-12-16 20:34:07,354 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [9] total 13 [2021-12-16 20:34:07,354 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2006214967] [2021-12-16 20:34:07,354 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-16 20:34:07,355 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-12-16 20:34:07,355 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-16 20:34:07,355 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-12-16 20:34:07,355 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2021-12-16 20:34:07,355 INFO L87 Difference]: Start difference. First operand 88 states and 111 transitions. Second operand has 6 states, 6 states have (on average 4.666666666666667) internal successors, (28), 6 states have internal predecessors, (28), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-16 20:34:07,444 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-16 20:34:07,444 INFO L93 Difference]: Finished difference Result 128 states and 160 transitions. [2021-12-16 20:34:07,445 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-16 20:34:07,445 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.666666666666667) internal successors, (28), 6 states have internal predecessors, (28), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 31 [2021-12-16 20:34:07,445 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-16 20:34:07,445 INFO L225 Difference]: With dead ends: 128 [2021-12-16 20:34:07,445 INFO L226 Difference]: Without dead ends: 93 [2021-12-16 20:34:07,446 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=46, Invalid=164, Unknown=0, NotChecked=0, Total=210 [2021-12-16 20:34:07,446 INFO L933 BasicCegarLoop]: 50 mSDtfsCounter, 61 mSDsluCounter, 109 mSDsCounter, 0 mSdLazyCounter, 96 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 159 SdHoareTripleChecker+Invalid, 99 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 96 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-16 20:34:07,446 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [65 Valid, 159 Invalid, 99 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 96 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-16 20:34:07,447 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2021-12-16 20:34:07,450 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 89. [2021-12-16 20:34:07,451 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89 states, 79 states have (on average 1.2658227848101267) internal successors, (100), 80 states have internal predecessors, (100), 6 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-12-16 20:34:07,451 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 111 transitions. [2021-12-16 20:34:07,451 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 111 transitions. Word has length 31 [2021-12-16 20:34:07,451 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-16 20:34:07,451 INFO L470 AbstractCegarLoop]: Abstraction has 89 states and 111 transitions. [2021-12-16 20:34:07,451 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 4.666666666666667) internal successors, (28), 6 states have internal predecessors, (28), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-16 20:34:07,452 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 111 transitions. [2021-12-16 20:34:07,452 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-12-16 20:34:07,452 INFO L506 BasicCegarLoop]: Found error trace [2021-12-16 20:34:07,452 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-16 20:34:07,471 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-12-16 20:34:07,663 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-16 20:34:07,663 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-16 20:34:07,664 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-16 20:34:07,664 INFO L85 PathProgramCache]: Analyzing trace with hash 1241240931, now seen corresponding path program 1 times [2021-12-16 20:34:07,664 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-16 20:34:07,664 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [719093021] [2021-12-16 20:34:07,664 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 20:34:07,664 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-16 20:34:07,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:34:07,706 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-12-16 20:34:07,706 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-16 20:34:07,707 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [719093021] [2021-12-16 20:34:07,707 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [719093021] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-16 20:34:07,707 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [689367195] [2021-12-16 20:34:07,707 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 20:34:07,707 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-16 20:34:07,707 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-16 20:34:07,708 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) [2021-12-16 20:34:07,709 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-12-16 20:34:07,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:34:07,759 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 18 conjunts are in the unsatisfiable core [2021-12-16 20:34:07,760 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-16 20:34:07,944 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-16 20:34:07,944 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-16 20:34:08,054 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-12-16 20:34:08,054 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [689367195] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-16 20:34:08,054 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-16 20:34:08,055 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 12, 7] total 20 [2021-12-16 20:34:08,055 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [131414305] [2021-12-16 20:34:08,055 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-16 20:34:08,055 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-12-16 20:34:08,055 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-16 20:34:08,055 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-12-16 20:34:08,056 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=323, Unknown=0, NotChecked=0, Total=380 [2021-12-16 20:34:08,056 INFO L87 Difference]: Start difference. First operand 89 states and 111 transitions. Second operand has 20 states, 17 states have (on average 3.6470588235294117) internal successors, (62), 18 states have internal predecessors, (62), 3 states have call successors, (3), 2 states have call predecessors, (3), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-16 20:34:08,744 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-16 20:34:08,745 INFO L93 Difference]: Finished difference Result 279 states and 389 transitions. [2021-12-16 20:34:08,745 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-12-16 20:34:08,745 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 17 states have (on average 3.6470588235294117) internal successors, (62), 18 states have internal predecessors, (62), 3 states have call successors, (3), 2 states have call predecessors, (3), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 31 [2021-12-16 20:34:08,745 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-16 20:34:08,746 INFO L225 Difference]: With dead ends: 279 [2021-12-16 20:34:08,746 INFO L226 Difference]: Without dead ends: 253 [2021-12-16 20:34:08,747 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 50 SyntacticMatches, 1 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 284 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=239, Invalid=1243, Unknown=0, NotChecked=0, Total=1482 [2021-12-16 20:34:08,748 INFO L933 BasicCegarLoop]: 111 mSDtfsCounter, 426 mSDsluCounter, 980 mSDsCounter, 0 mSdLazyCounter, 469 mSolverCounterSat, 128 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 426 SdHoareTripleChecker+Valid, 1091 SdHoareTripleChecker+Invalid, 597 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 128 IncrementalHoareTripleChecker+Valid, 469 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-12-16 20:34:08,748 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [426 Valid, 1091 Invalid, 597 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [128 Valid, 469 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-12-16 20:34:08,748 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 253 states. [2021-12-16 20:34:08,755 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 253 to 120. [2021-12-16 20:34:08,755 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 120 states, 110 states have (on average 1.3181818181818181) internal successors, (145), 111 states have internal predecessors, (145), 6 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-12-16 20:34:08,756 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 156 transitions. [2021-12-16 20:34:08,756 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 156 transitions. Word has length 31 [2021-12-16 20:34:08,756 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-16 20:34:08,756 INFO L470 AbstractCegarLoop]: Abstraction has 120 states and 156 transitions. [2021-12-16 20:34:08,756 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 17 states have (on average 3.6470588235294117) internal successors, (62), 18 states have internal predecessors, (62), 3 states have call successors, (3), 2 states have call predecessors, (3), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-16 20:34:08,756 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 156 transitions. [2021-12-16 20:34:08,757 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-12-16 20:34:08,757 INFO L506 BasicCegarLoop]: Found error trace [2021-12-16 20:34:08,757 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-16 20:34:08,775 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-12-16 20:34:08,973 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,SelfDestructingSolverStorable12 [2021-12-16 20:34:08,973 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-16 20:34:08,974 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-16 20:34:08,974 INFO L85 PathProgramCache]: Analyzing trace with hash 431894305, now seen corresponding path program 1 times [2021-12-16 20:34:08,974 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-16 20:34:08,974 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1240238291] [2021-12-16 20:34:08,974 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 20:34:08,974 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-16 20:34:08,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:34:09,197 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-12-16 20:34:09,198 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-16 20:34:09,198 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1240238291] [2021-12-16 20:34:09,198 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1240238291] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-16 20:34:09,198 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [187097254] [2021-12-16 20:34:09,198 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 20:34:09,198 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-16 20:34:09,198 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-16 20:34:09,199 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) [2021-12-16 20:34:09,200 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-12-16 20:34:09,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:34:09,251 INFO L263 TraceCheckSpWp]: Trace formula consists of 158 conjuncts, 56 conjunts are in the unsatisfiable core [2021-12-16 20:34:09,253 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-16 20:34:09,326 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-12-16 20:34:09,529 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-16 20:34:09,529 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-16 20:34:09,531 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-16 20:34:09,538 INFO L354 Elim1Store]: treesize reduction 12, result has 40.0 percent of original size [2021-12-16 20:34:09,538 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 75 treesize of output 38 [2021-12-16 20:34:09,561 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-16 20:34:09,561 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-16 20:34:09,784 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-12-16 20:34:09,784 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [187097254] provided 1 perfect and 1 imperfect interpolant sequences [2021-12-16 20:34:09,785 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-12-16 20:34:09,785 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [11, 13] total 27 [2021-12-16 20:34:09,785 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1126771953] [2021-12-16 20:34:09,785 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-16 20:34:09,785 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-12-16 20:34:09,785 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-16 20:34:09,785 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-12-16 20:34:09,786 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=100, Invalid=602, Unknown=0, NotChecked=0, Total=702 [2021-12-16 20:34:09,786 INFO L87 Difference]: Start difference. First operand 120 states and 156 transitions. Second operand has 12 states, 11 states have (on average 2.5454545454545454) internal successors, (28), 11 states have internal predecessors, (28), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-16 20:34:10,072 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-16 20:34:10,073 INFO L93 Difference]: Finished difference Result 220 states and 294 transitions. [2021-12-16 20:34:10,073 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-12-16 20:34:10,073 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 2.5454545454545454) internal successors, (28), 11 states have internal predecessors, (28), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 31 [2021-12-16 20:34:10,073 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-16 20:34:10,074 INFO L225 Difference]: With dead ends: 220 [2021-12-16 20:34:10,074 INFO L226 Difference]: Without dead ends: 211 [2021-12-16 20:34:10,075 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 45 SyntacticMatches, 3 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 319 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=168, Invalid=954, Unknown=0, NotChecked=0, Total=1122 [2021-12-16 20:34:10,075 INFO L933 BasicCegarLoop]: 88 mSDtfsCounter, 108 mSDsluCounter, 510 mSDsCounter, 0 mSdLazyCounter, 254 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 116 SdHoareTripleChecker+Valid, 598 SdHoareTripleChecker+Invalid, 273 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 254 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-16 20:34:10,076 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [116 Valid, 598 Invalid, 273 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 254 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-16 20:34:10,076 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 211 states. [2021-12-16 20:34:10,083 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 211 to 144. [2021-12-16 20:34:10,084 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 144 states, 134 states have (on average 1.335820895522388) internal successors, (179), 135 states have internal predecessors, (179), 6 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-12-16 20:34:10,084 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 190 transitions. [2021-12-16 20:34:10,084 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 190 transitions. Word has length 31 [2021-12-16 20:34:10,084 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-16 20:34:10,085 INFO L470 AbstractCegarLoop]: Abstraction has 144 states and 190 transitions. [2021-12-16 20:34:10,085 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 2.5454545454545454) internal successors, (28), 11 states have internal predecessors, (28), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-16 20:34:10,085 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 190 transitions. [2021-12-16 20:34:10,085 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-12-16 20:34:10,085 INFO L506 BasicCegarLoop]: Found error trace [2021-12-16 20:34:10,085 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-16 20:34:10,101 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-12-16 20:34:10,295 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-12-16 20:34:10,295 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-16 20:34:10,296 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-16 20:34:10,296 INFO L85 PathProgramCache]: Analyzing trace with hash 596615928, now seen corresponding path program 1 times [2021-12-16 20:34:10,296 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-16 20:34:10,296 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1121682101] [2021-12-16 20:34:10,296 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 20:34:10,296 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-16 20:34:10,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:34:10,387 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-12-16 20:34:10,387 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-16 20:34:10,387 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1121682101] [2021-12-16 20:34:10,387 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1121682101] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-16 20:34:10,388 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [219640431] [2021-12-16 20:34:10,388 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 20:34:10,388 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-16 20:34:10,388 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-16 20:34:10,389 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) [2021-12-16 20:34:10,422 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-12-16 20:34:10,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:34:10,445 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 11 conjunts are in the unsatisfiable core [2021-12-16 20:34:10,449 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-16 20:34:10,599 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-12-16 20:34:10,600 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-16 20:34:14,084 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-12-16 20:34:14,084 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [219640431] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-16 20:34:14,084 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-16 20:34:14,084 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 17 [2021-12-16 20:34:14,084 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2071421435] [2021-12-16 20:34:14,085 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-16 20:34:14,085 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-12-16 20:34:14,085 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-16 20:34:14,085 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-12-16 20:34:14,085 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=225, Unknown=1, NotChecked=0, Total=272 [2021-12-16 20:34:14,086 INFO L87 Difference]: Start difference. First operand 144 states and 190 transitions. Second operand has 17 states, 17 states have (on average 4.294117647058823) internal successors, (73), 17 states have internal predecessors, (73), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-16 20:34:14,564 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-16 20:34:14,564 INFO L93 Difference]: Finished difference Result 438 states and 600 transitions. [2021-12-16 20:34:14,564 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-12-16 20:34:14,564 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 4.294117647058823) internal successors, (73), 17 states have internal predecessors, (73), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 32 [2021-12-16 20:34:14,565 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-16 20:34:14,566 INFO L225 Difference]: With dead ends: 438 [2021-12-16 20:34:14,566 INFO L226 Difference]: Without dead ends: 412 [2021-12-16 20:34:14,566 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 54 SyntacticMatches, 3 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 106 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=112, Invalid=487, Unknown=1, NotChecked=0, Total=600 [2021-12-16 20:34:14,567 INFO L933 BasicCegarLoop]: 108 mSDtfsCounter, 236 mSDsluCounter, 834 mSDsCounter, 0 mSdLazyCounter, 257 mSolverCounterSat, 40 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 240 SdHoareTripleChecker+Valid, 942 SdHoareTripleChecker+Invalid, 341 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 40 IncrementalHoareTripleChecker+Valid, 257 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 44 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-16 20:34:14,567 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [240 Valid, 942 Invalid, 341 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [40 Valid, 257 Invalid, 0 Unknown, 44 Unchecked, 0.2s Time] [2021-12-16 20:34:14,567 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 412 states. [2021-12-16 20:34:14,580 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 412 to 212. [2021-12-16 20:34:14,580 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 212 states, 201 states have (on average 1.3582089552238805) internal successors, (273), 202 states have internal predecessors, (273), 7 states have call successors, (7), 3 states have call predecessors, (7), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-12-16 20:34:14,581 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 212 states to 212 states and 286 transitions. [2021-12-16 20:34:14,581 INFO L78 Accepts]: Start accepts. Automaton has 212 states and 286 transitions. Word has length 32 [2021-12-16 20:34:14,581 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-16 20:34:14,581 INFO L470 AbstractCegarLoop]: Abstraction has 212 states and 286 transitions. [2021-12-16 20:34:14,581 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 4.294117647058823) internal successors, (73), 17 states have internal predecessors, (73), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-16 20:34:14,582 INFO L276 IsEmpty]: Start isEmpty. Operand 212 states and 286 transitions. [2021-12-16 20:34:14,582 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-12-16 20:34:14,582 INFO L506 BasicCegarLoop]: Found error trace [2021-12-16 20:34:14,582 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-16 20:34:14,600 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-12-16 20:34:14,798 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,SelfDestructingSolverStorable14 [2021-12-16 20:34:14,798 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-16 20:34:14,799 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-16 20:34:14,799 INFO L85 PathProgramCache]: Analyzing trace with hash -1820522836, now seen corresponding path program 1 times [2021-12-16 20:34:14,799 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-16 20:34:14,799 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1549722058] [2021-12-16 20:34:14,799 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 20:34:14,799 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-16 20:34:14,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:34:14,877 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 18 [2021-12-16 20:34:14,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:34:14,881 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-12-16 20:34:14,882 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-16 20:34:14,882 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1549722058] [2021-12-16 20:34:14,882 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1549722058] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-16 20:34:14,882 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2101325751] [2021-12-16 20:34:14,882 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 20:34:14,882 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-16 20:34:14,882 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-16 20:34:14,883 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) [2021-12-16 20:34:14,885 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-12-16 20:34:14,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:34:14,936 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 5 conjunts are in the unsatisfiable core [2021-12-16 20:34:14,937 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-16 20:34:14,988 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-16 20:34:14,988 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-16 20:34:14,988 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2101325751] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-16 20:34:14,988 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-12-16 20:34:14,988 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [8] total 9 [2021-12-16 20:34:14,989 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [235023578] [2021-12-16 20:34:14,989 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-16 20:34:14,989 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-16 20:34:14,989 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-16 20:34:14,990 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-16 20:34:14,990 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2021-12-16 20:34:14,990 INFO L87 Difference]: Start difference. First operand 212 states and 286 transitions. Second operand has 3 states, 3 states have (on average 10.333333333333334) internal successors, (31), 3 states have internal predecessors, (31), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-16 20:34:15,017 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-16 20:34:15,017 INFO L93 Difference]: Finished difference Result 242 states and 325 transitions. [2021-12-16 20:34:15,017 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-16 20:34:15,017 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 10.333333333333334) internal successors, (31), 3 states have internal predecessors, (31), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 34 [2021-12-16 20:34:15,018 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-16 20:34:15,019 INFO L225 Difference]: With dead ends: 242 [2021-12-16 20:34:15,019 INFO L226 Difference]: Without dead ends: 221 [2021-12-16 20:34:15,019 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2021-12-16 20:34:15,019 INFO L933 BasicCegarLoop]: 58 mSDtfsCounter, 5 mSDsluCounter, 53 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 111 SdHoareTripleChecker+Invalid, 16 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-16 20:34:15,020 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 111 Invalid, 16 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 16 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-16 20:34:15,021 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 221 states. [2021-12-16 20:34:15,040 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 221 to 216. [2021-12-16 20:34:15,041 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 216 states, 205 states have (on average 1.3609756097560977) internal successors, (279), 206 states have internal predecessors, (279), 7 states have call successors, (7), 3 states have call predecessors, (7), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-12-16 20:34:15,042 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 216 states to 216 states and 292 transitions. [2021-12-16 20:34:15,042 INFO L78 Accepts]: Start accepts. Automaton has 216 states and 292 transitions. Word has length 34 [2021-12-16 20:34:15,042 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-16 20:34:15,042 INFO L470 AbstractCegarLoop]: Abstraction has 216 states and 292 transitions. [2021-12-16 20:34:15,042 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 10.333333333333334) internal successors, (31), 3 states have internal predecessors, (31), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-16 20:34:15,042 INFO L276 IsEmpty]: Start isEmpty. Operand 216 states and 292 transitions. [2021-12-16 20:34:15,043 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-12-16 20:34:15,044 INFO L506 BasicCegarLoop]: Found error trace [2021-12-16 20:34:15,044 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-16 20:34:15,060 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-12-16 20:34:15,260 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,SelfDestructingSolverStorable15 [2021-12-16 20:34:15,260 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-16 20:34:15,260 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-16 20:34:15,260 INFO L85 PathProgramCache]: Analyzing trace with hash -1917352198, now seen corresponding path program 1 times [2021-12-16 20:34:15,261 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-16 20:34:15,261 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1399918662] [2021-12-16 20:34:15,261 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 20:34:15,261 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-16 20:34:15,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:34:15,449 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-16 20:34:15,450 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-16 20:34:15,450 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1399918662] [2021-12-16 20:34:15,450 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1399918662] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-16 20:34:15,450 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1675986747] [2021-12-16 20:34:15,450 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 20:34:15,450 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-16 20:34:15,450 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-16 20:34:15,451 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) [2021-12-16 20:34:15,452 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-12-16 20:34:15,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:34:15,505 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 18 conjunts are in the unsatisfiable core [2021-12-16 20:34:15,506 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-16 20:34:15,640 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-12-16 20:34:15,640 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-16 20:34:15,765 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-12-16 20:34:15,765 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1675986747] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-16 20:34:15,765 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-16 20:34:15,765 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 9, 8] total 24 [2021-12-16 20:34:15,765 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1359011752] [2021-12-16 20:34:15,766 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-16 20:34:15,766 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-12-16 20:34:15,766 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-16 20:34:15,766 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-12-16 20:34:15,766 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=485, Unknown=0, NotChecked=0, Total=552 [2021-12-16 20:34:15,766 INFO L87 Difference]: Start difference. First operand 216 states and 292 transitions. Second operand has 24 states, 24 states have (on average 2.9166666666666665) internal successors, (70), 24 states have internal predecessors, (70), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-16 20:34:17,524 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-16 20:34:17,524 INFO L93 Difference]: Finished difference Result 703 states and 968 transitions. [2021-12-16 20:34:17,536 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-12-16 20:34:17,536 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 2.9166666666666665) internal successors, (70), 24 states have internal predecessors, (70), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 34 [2021-12-16 20:34:17,536 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-16 20:34:17,538 INFO L225 Difference]: With dead ends: 703 [2021-12-16 20:34:17,538 INFO L226 Difference]: Without dead ends: 538 [2021-12-16 20:34:17,539 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 58 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 741 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=576, Invalid=2846, Unknown=0, NotChecked=0, Total=3422 [2021-12-16 20:34:17,540 INFO L933 BasicCegarLoop]: 85 mSDtfsCounter, 1108 mSDsluCounter, 1060 mSDsCounter, 0 mSdLazyCounter, 747 mSolverCounterSat, 234 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1111 SdHoareTripleChecker+Valid, 1145 SdHoareTripleChecker+Invalid, 981 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 234 IncrementalHoareTripleChecker+Valid, 747 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-12-16 20:34:17,540 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1111 Valid, 1145 Invalid, 981 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [234 Valid, 747 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-12-16 20:34:17,540 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 538 states. [2021-12-16 20:34:17,575 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 538 to 278. [2021-12-16 20:34:17,576 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 278 states, 267 states have (on average 1.3408239700374531) internal successors, (358), 268 states have internal predecessors, (358), 7 states have call successors, (7), 3 states have call predecessors, (7), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-12-16 20:34:17,577 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 278 states to 278 states and 371 transitions. [2021-12-16 20:34:17,577 INFO L78 Accepts]: Start accepts. Automaton has 278 states and 371 transitions. Word has length 34 [2021-12-16 20:34:17,577 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-16 20:34:17,577 INFO L470 AbstractCegarLoop]: Abstraction has 278 states and 371 transitions. [2021-12-16 20:34:17,577 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 2.9166666666666665) internal successors, (70), 24 states have internal predecessors, (70), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-16 20:34:17,578 INFO L276 IsEmpty]: Start isEmpty. Operand 278 states and 371 transitions. [2021-12-16 20:34:17,578 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-12-16 20:34:17,578 INFO L506 BasicCegarLoop]: Found error trace [2021-12-16 20:34:17,578 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-16 20:34:17,596 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-12-16 20:34:17,791 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,SelfDestructingSolverStorable16 [2021-12-16 20:34:17,791 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-16 20:34:17,792 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-16 20:34:17,792 INFO L85 PathProgramCache]: Analyzing trace with hash -337481851, now seen corresponding path program 1 times [2021-12-16 20:34:17,792 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-16 20:34:17,792 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [380171067] [2021-12-16 20:34:17,792 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 20:34:17,792 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-16 20:34:17,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:34:18,208 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-12-16 20:34:18,208 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-16 20:34:18,208 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [380171067] [2021-12-16 20:34:18,208 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [380171067] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-16 20:34:18,208 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1908568909] [2021-12-16 20:34:18,214 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 20:34:18,214 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-16 20:34:18,214 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-16 20:34:18,215 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) [2021-12-16 20:34:18,216 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-12-16 20:34:18,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:34:18,283 INFO L263 TraceCheckSpWp]: Trace formula consists of 180 conjuncts, 52 conjunts are in the unsatisfiable core [2021-12-16 20:34:18,284 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-16 20:34:18,332 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-16 20:34:18,653 INFO L354 Elim1Store]: treesize reduction 3, result has 78.6 percent of original size [2021-12-16 20:34:18,653 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 31 treesize of output 22 [2021-12-16 20:34:18,676 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 3 proven. 11 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-12-16 20:34:18,677 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-16 20:34:18,986 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 4 proven. 4 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-12-16 20:34:18,986 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1908568909] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-16 20:34:18,986 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-16 20:34:18,986 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 12] total 38 [2021-12-16 20:34:18,987 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1049350337] [2021-12-16 20:34:18,987 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-16 20:34:18,987 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2021-12-16 20:34:18,987 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-16 20:34:18,987 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-12-16 20:34:18,988 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=217, Invalid=1189, Unknown=0, NotChecked=0, Total=1406 [2021-12-16 20:34:18,988 INFO L87 Difference]: Start difference. First operand 278 states and 371 transitions. Second operand has 38 states, 38 states have (on average 2.289473684210526) internal successors, (87), 38 states have internal predecessors, (87), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-16 20:34:19,912 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-16 20:34:19,912 INFO L93 Difference]: Finished difference Result 606 states and 818 transitions. [2021-12-16 20:34:19,912 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-12-16 20:34:19,913 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 2.289473684210526) internal successors, (87), 38 states have internal predecessors, (87), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 37 [2021-12-16 20:34:19,913 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-16 20:34:19,914 INFO L225 Difference]: With dead ends: 606 [2021-12-16 20:34:19,914 INFO L226 Difference]: Without dead ends: 465 [2021-12-16 20:34:19,916 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 101 GetRequests, 53 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 742 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=394, Invalid=2056, Unknown=0, NotChecked=0, Total=2450 [2021-12-16 20:34:19,916 INFO L933 BasicCegarLoop]: 99 mSDtfsCounter, 228 mSDsluCounter, 1274 mSDsCounter, 0 mSdLazyCounter, 915 mSolverCounterSat, 53 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 236 SdHoareTripleChecker+Valid, 1373 SdHoareTripleChecker+Invalid, 968 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 53 IncrementalHoareTripleChecker+Valid, 915 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-12-16 20:34:19,916 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [236 Valid, 1373 Invalid, 968 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [53 Valid, 915 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-12-16 20:34:19,917 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 465 states. [2021-12-16 20:34:19,941 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 465 to 313. [2021-12-16 20:34:19,942 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 313 states, 302 states have (on average 1.3344370860927153) internal successors, (403), 303 states have internal predecessors, (403), 7 states have call successors, (7), 3 states have call predecessors, (7), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-12-16 20:34:19,942 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 313 states to 313 states and 416 transitions. [2021-12-16 20:34:19,943 INFO L78 Accepts]: Start accepts. Automaton has 313 states and 416 transitions. Word has length 37 [2021-12-16 20:34:19,943 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-16 20:34:19,943 INFO L470 AbstractCegarLoop]: Abstraction has 313 states and 416 transitions. [2021-12-16 20:34:19,943 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 2.289473684210526) internal successors, (87), 38 states have internal predecessors, (87), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-16 20:34:19,943 INFO L276 IsEmpty]: Start isEmpty. Operand 313 states and 416 transitions. [2021-12-16 20:34:19,945 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-12-16 20:34:19,945 INFO L506 BasicCegarLoop]: Found error trace [2021-12-16 20:34:19,945 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-16 20:34:19,962 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-12-16 20:34:20,145 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,SelfDestructingSolverStorable17 [2021-12-16 20:34:20,145 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-16 20:34:20,146 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-16 20:34:20,146 INFO L85 PathProgramCache]: Analyzing trace with hash 363582727, now seen corresponding path program 1 times [2021-12-16 20:34:20,146 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-16 20:34:20,146 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [894552996] [2021-12-16 20:34:20,146 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 20:34:20,146 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-16 20:34:20,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:34:20,575 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 3 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-12-16 20:34:20,575 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-16 20:34:20,576 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [894552996] [2021-12-16 20:34:20,576 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [894552996] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-16 20:34:20,576 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [796791668] [2021-12-16 20:34:20,576 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 20:34:20,576 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-16 20:34:20,576 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-16 20:34:20,579 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) [2021-12-16 20:34:20,581 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-12-16 20:34:20,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:34:20,659 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 53 conjunts are in the unsatisfiable core [2021-12-16 20:34:20,660 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-16 20:34:20,701 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-16 20:34:20,877 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-16 20:34:20,878 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-16 20:34:20,879 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-16 20:34:20,887 INFO L354 Elim1Store]: treesize reduction 12, result has 40.0 percent of original size [2021-12-16 20:34:20,887 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 75 treesize of output 38 [2021-12-16 20:34:20,910 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-12-16 20:34:20,910 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-16 20:34:21,082 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-12-16 20:34:21,083 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [796791668] provided 1 perfect and 1 imperfect interpolant sequences [2021-12-16 20:34:21,083 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-12-16 20:34:21,083 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [12, 11] total 25 [2021-12-16 20:34:21,083 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [140832140] [2021-12-16 20:34:21,083 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-16 20:34:21,084 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-12-16 20:34:21,084 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-16 20:34:21,084 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-12-16 20:34:21,084 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=483, Unknown=0, NotChecked=0, Total=600 [2021-12-16 20:34:21,084 INFO L87 Difference]: Start difference. First operand 313 states and 416 transitions. Second operand has 11 states, 11 states have (on average 2.8181818181818183) internal successors, (31), 10 states have internal predecessors, (31), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-16 20:34:21,360 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-16 20:34:21,360 INFO L93 Difference]: Finished difference Result 410 states and 546 transitions. [2021-12-16 20:34:21,360 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-12-16 20:34:21,360 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.8181818181818183) internal successors, (31), 10 states have internal predecessors, (31), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 37 [2021-12-16 20:34:21,361 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-16 20:34:21,362 INFO L225 Difference]: With dead ends: 410 [2021-12-16 20:34:21,362 INFO L226 Difference]: Without dead ends: 402 [2021-12-16 20:34:21,362 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 60 SyntacticMatches, 4 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 343 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=182, Invalid=748, Unknown=0, NotChecked=0, Total=930 [2021-12-16 20:34:21,363 INFO L933 BasicCegarLoop]: 84 mSDtfsCounter, 165 mSDsluCounter, 386 mSDsCounter, 0 mSdLazyCounter, 201 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 173 SdHoareTripleChecker+Valid, 470 SdHoareTripleChecker+Invalid, 229 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 201 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-16 20:34:21,363 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [173 Valid, 470 Invalid, 229 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 201 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-16 20:34:21,363 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 402 states. [2021-12-16 20:34:21,394 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 402 to 309. [2021-12-16 20:34:21,395 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 309 states, 298 states have (on average 1.332214765100671) internal successors, (397), 299 states have internal predecessors, (397), 7 states have call successors, (7), 3 states have call predecessors, (7), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-12-16 20:34:21,396 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 309 states to 309 states and 410 transitions. [2021-12-16 20:34:21,396 INFO L78 Accepts]: Start accepts. Automaton has 309 states and 410 transitions. Word has length 37 [2021-12-16 20:34:21,396 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-16 20:34:21,396 INFO L470 AbstractCegarLoop]: Abstraction has 309 states and 410 transitions. [2021-12-16 20:34:21,396 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 2.8181818181818183) internal successors, (31), 10 states have internal predecessors, (31), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-16 20:34:21,396 INFO L276 IsEmpty]: Start isEmpty. Operand 309 states and 410 transitions. [2021-12-16 20:34:21,397 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-12-16 20:34:21,397 INFO L506 BasicCegarLoop]: Found error trace [2021-12-16 20:34:21,397 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-16 20:34:21,413 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-12-16 20:34:21,613 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-16 20:34:21,613 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-16 20:34:21,614 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-16 20:34:21,614 INFO L85 PathProgramCache]: Analyzing trace with hash 1656301321, now seen corresponding path program 1 times [2021-12-16 20:34:21,614 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-16 20:34:21,614 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [775575372] [2021-12-16 20:34:21,614 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 20:34:21,614 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-16 20:34:21,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:34:21,639 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 18 [2021-12-16 20:34:21,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:34:21,642 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-16 20:34:21,642 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-16 20:34:21,642 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [775575372] [2021-12-16 20:34:21,643 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [775575372] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-16 20:34:21,643 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-16 20:34:21,643 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-12-16 20:34:21,643 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1500349636] [2021-12-16 20:34:21,643 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-16 20:34:21,643 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-12-16 20:34:21,643 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-16 20:34:21,644 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-12-16 20:34:21,644 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-12-16 20:34:21,644 INFO L87 Difference]: Start difference. First operand 309 states and 410 transitions. Second operand has 4 states, 4 states have (on average 9.0) internal successors, (36), 4 states have internal predecessors, (36), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-16 20:34:21,682 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-16 20:34:21,683 INFO L93 Difference]: Finished difference Result 332 states and 437 transitions. [2021-12-16 20:34:21,683 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-12-16 20:34:21,683 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 9.0) internal successors, (36), 4 states have internal predecessors, (36), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 39 [2021-12-16 20:34:21,683 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-16 20:34:21,685 INFO L225 Difference]: With dead ends: 332 [2021-12-16 20:34:21,685 INFO L226 Difference]: Without dead ends: 310 [2021-12-16 20:34:21,685 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-12-16 20:34:21,687 INFO L933 BasicCegarLoop]: 59 mSDtfsCounter, 5 mSDsluCounter, 95 mSDsCounter, 0 mSdLazyCounter, 26 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 154 SdHoareTripleChecker+Invalid, 26 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 26 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-16 20:34:21,687 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 154 Invalid, 26 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 26 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-16 20:34:21,691 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 310 states. [2021-12-16 20:34:21,728 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 310 to 308. [2021-12-16 20:34:21,729 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 308 states, 297 states have (on average 1.3265993265993266) internal successors, (394), 298 states have internal predecessors, (394), 7 states have call successors, (7), 3 states have call predecessors, (7), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-12-16 20:34:21,731 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 308 states to 308 states and 407 transitions. [2021-12-16 20:34:21,731 INFO L78 Accepts]: Start accepts. Automaton has 308 states and 407 transitions. Word has length 39 [2021-12-16 20:34:21,731 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-16 20:34:21,732 INFO L470 AbstractCegarLoop]: Abstraction has 308 states and 407 transitions. [2021-12-16 20:34:21,732 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 9.0) internal successors, (36), 4 states have internal predecessors, (36), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-16 20:34:21,732 INFO L276 IsEmpty]: Start isEmpty. Operand 308 states and 407 transitions. [2021-12-16 20:34:21,733 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-12-16 20:34:21,733 INFO L506 BasicCegarLoop]: Found error trace [2021-12-16 20:34:21,733 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-16 20:34:21,733 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2021-12-16 20:34:21,733 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-16 20:34:21,734 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-16 20:34:21,734 INFO L85 PathProgramCache]: Analyzing trace with hash -1348669506, now seen corresponding path program 2 times [2021-12-16 20:34:21,734 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-16 20:34:21,734 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1316012468] [2021-12-16 20:34:21,734 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 20:34:21,734 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-16 20:34:21,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:34:21,953 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 2 proven. 12 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-12-16 20:34:21,954 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-16 20:34:21,954 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1316012468] [2021-12-16 20:34:21,954 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1316012468] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-16 20:34:21,954 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [324992305] [2021-12-16 20:34:21,954 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-16 20:34:21,954 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-16 20:34:21,954 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-16 20:34:21,955 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) [2021-12-16 20:34:21,956 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-12-16 20:34:22,016 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-16 20:34:22,016 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-16 20:34:22,017 INFO L263 TraceCheckSpWp]: Trace formula consists of 186 conjuncts, 15 conjunts are in the unsatisfiable core [2021-12-16 20:34:22,018 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-16 20:34:22,168 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-12-16 20:34:22,168 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-16 20:34:22,336 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-12-16 20:34:22,336 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [324992305] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-16 20:34:22,336 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-16 20:34:22,336 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 9, 8] total 24 [2021-12-16 20:34:22,336 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1620639747] [2021-12-16 20:34:22,336 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-16 20:34:22,336 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-12-16 20:34:22,336 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-16 20:34:22,337 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-12-16 20:34:22,337 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=480, Unknown=0, NotChecked=0, Total=552 [2021-12-16 20:34:22,337 INFO L87 Difference]: Start difference. First operand 308 states and 407 transitions. Second operand has 24 states, 24 states have (on average 3.0416666666666665) internal successors, (73), 24 states have internal predecessors, (73), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-16 20:34:25,305 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-16 20:34:25,305 INFO L93 Difference]: Finished difference Result 1201 states and 1619 transitions. [2021-12-16 20:34:25,306 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2021-12-16 20:34:25,306 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 3.0416666666666665) internal successors, (73), 24 states have internal predecessors, (73), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 38 [2021-12-16 20:34:25,306 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-16 20:34:25,314 INFO L225 Difference]: With dead ends: 1201 [2021-12-16 20:34:25,314 INFO L226 Difference]: Without dead ends: 1191 [2021-12-16 20:34:25,316 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 65 SyntacticMatches, 0 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1984 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=824, Invalid=6148, Unknown=0, NotChecked=0, Total=6972 [2021-12-16 20:34:25,317 INFO L933 BasicCegarLoop]: 320 mSDtfsCounter, 1509 mSDsluCounter, 3148 mSDsCounter, 0 mSdLazyCounter, 1615 mSolverCounterSat, 396 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1509 SdHoareTripleChecker+Valid, 3468 SdHoareTripleChecker+Invalid, 2011 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 396 IncrementalHoareTripleChecker+Valid, 1615 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2021-12-16 20:34:25,317 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1509 Valid, 3468 Invalid, 2011 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [396 Valid, 1615 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2021-12-16 20:34:25,318 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1191 states. [2021-12-16 20:34:25,355 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1191 to 272. [2021-12-16 20:34:25,356 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 272 states, 261 states have (on average 1.314176245210728) internal successors, (343), 262 states have internal predecessors, (343), 7 states have call successors, (7), 3 states have call predecessors, (7), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-12-16 20:34:25,357 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 272 states to 272 states and 356 transitions. [2021-12-16 20:34:25,357 INFO L78 Accepts]: Start accepts. Automaton has 272 states and 356 transitions. Word has length 38 [2021-12-16 20:34:25,357 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-16 20:34:25,357 INFO L470 AbstractCegarLoop]: Abstraction has 272 states and 356 transitions. [2021-12-16 20:34:25,358 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 3.0416666666666665) internal successors, (73), 24 states have internal predecessors, (73), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-16 20:34:25,358 INFO L276 IsEmpty]: Start isEmpty. Operand 272 states and 356 transitions. [2021-12-16 20:34:25,358 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-12-16 20:34:25,358 INFO L506 BasicCegarLoop]: Found error trace [2021-12-16 20:34:25,358 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-16 20:34:25,376 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-12-16 20:34:25,567 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,16 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-16 20:34:25,567 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-16 20:34:25,568 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-16 20:34:25,568 INFO L85 PathProgramCache]: Analyzing trace with hash 916341538, now seen corresponding path program 1 times [2021-12-16 20:34:25,568 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-16 20:34:25,568 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [15294466] [2021-12-16 20:34:25,568 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 20:34:25,568 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-16 20:34:25,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:34:25,704 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-12-16 20:34:25,704 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-16 20:34:25,704 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [15294466] [2021-12-16 20:34:25,705 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [15294466] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-16 20:34:25,705 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1012327488] [2021-12-16 20:34:25,705 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 20:34:25,705 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-16 20:34:25,705 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-16 20:34:25,706 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) [2021-12-16 20:34:25,707 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-12-16 20:34:25,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:34:25,768 INFO L263 TraceCheckSpWp]: Trace formula consists of 190 conjuncts, 18 conjunts are in the unsatisfiable core [2021-12-16 20:34:25,769 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-16 20:34:25,947 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-12-16 20:34:25,947 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-16 20:34:26,138 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-12-16 20:34:26,138 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1012327488] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-16 20:34:26,139 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-16 20:34:26,139 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 10] total 23 [2021-12-16 20:34:26,139 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [460469396] [2021-12-16 20:34:26,139 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-16 20:34:26,139 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-12-16 20:34:26,139 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-16 20:34:26,140 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-12-16 20:34:26,140 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=433, Unknown=0, NotChecked=0, Total=506 [2021-12-16 20:34:26,140 INFO L87 Difference]: Start difference. First operand 272 states and 356 transitions. Second operand has 23 states, 23 states have (on average 2.9130434782608696) internal successors, (67), 23 states have internal predecessors, (67), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-16 20:34:26,672 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-16 20:34:26,673 INFO L93 Difference]: Finished difference Result 431 states and 560 transitions. [2021-12-16 20:34:26,674 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-12-16 20:34:26,674 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 2.9130434782608696) internal successors, (67), 23 states have internal predecessors, (67), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 40 [2021-12-16 20:34:26,674 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-16 20:34:26,675 INFO L225 Difference]: With dead ends: 431 [2021-12-16 20:34:26,675 INFO L226 Difference]: Without dead ends: 347 [2021-12-16 20:34:26,676 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 66 SyntacticMatches, 2 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 154 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=173, Invalid=819, Unknown=0, NotChecked=0, Total=992 [2021-12-16 20:34:26,676 INFO L933 BasicCegarLoop]: 105 mSDtfsCounter, 529 mSDsluCounter, 1056 mSDsCounter, 0 mSdLazyCounter, 466 mSolverCounterSat, 99 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 529 SdHoareTripleChecker+Valid, 1161 SdHoareTripleChecker+Invalid, 565 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 99 IncrementalHoareTripleChecker+Valid, 466 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-16 20:34:26,677 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [529 Valid, 1161 Invalid, 565 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [99 Valid, 466 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-12-16 20:34:26,677 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 347 states. [2021-12-16 20:34:26,700 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 347 to 242. [2021-12-16 20:34:26,701 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 242 states, 231 states have (on average 1.2987012987012987) internal successors, (300), 232 states have internal predecessors, (300), 7 states have call successors, (7), 3 states have call predecessors, (7), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-12-16 20:34:26,702 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 242 states to 242 states and 313 transitions. [2021-12-16 20:34:26,702 INFO L78 Accepts]: Start accepts. Automaton has 242 states and 313 transitions. Word has length 40 [2021-12-16 20:34:26,702 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-16 20:34:26,703 INFO L470 AbstractCegarLoop]: Abstraction has 242 states and 313 transitions. [2021-12-16 20:34:26,703 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 2.9130434782608696) internal successors, (67), 23 states have internal predecessors, (67), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-16 20:34:26,703 INFO L276 IsEmpty]: Start isEmpty. Operand 242 states and 313 transitions. [2021-12-16 20:34:26,703 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-12-16 20:34:26,703 INFO L506 BasicCegarLoop]: Found error trace [2021-12-16 20:34:26,704 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-16 20:34:26,719 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Ended with exit code 0 [2021-12-16 20:34:26,904 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-12-16 20:34:26,904 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-16 20:34:26,904 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-16 20:34:26,905 INFO L85 PathProgramCache]: Analyzing trace with hash -1229432872, now seen corresponding path program 1 times [2021-12-16 20:34:26,905 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-16 20:34:26,905 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [356109882] [2021-12-16 20:34:26,905 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 20:34:26,905 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-16 20:34:26,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:34:26,989 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 18 [2021-12-16 20:34:26,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:34:26,992 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 28 [2021-12-16 20:34:26,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:34:26,997 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-16 20:34:26,997 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-16 20:34:26,997 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [356109882] [2021-12-16 20:34:26,997 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [356109882] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-16 20:34:26,997 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1659600590] [2021-12-16 20:34:26,997 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 20:34:26,997 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-16 20:34:26,997 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-16 20:34:26,998 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) [2021-12-16 20:34:26,999 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-12-16 20:34:27,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:34:27,053 INFO L263 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 10 conjunts are in the unsatisfiable core [2021-12-16 20:34:27,053 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-16 20:34:27,170 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-12-16 20:34:27,170 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-16 20:34:27,293 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-12-16 20:34:27,293 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1659600590] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-16 20:34:27,293 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-16 20:34:27,294 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 16 [2021-12-16 20:34:27,294 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [639863617] [2021-12-16 20:34:27,294 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-16 20:34:27,296 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-12-16 20:34:27,296 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-16 20:34:27,296 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-12-16 20:34:27,296 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-12-16 20:34:27,296 INFO L87 Difference]: Start difference. First operand 242 states and 313 transitions. Second operand has 16 states, 16 states have (on average 4.6875) internal successors, (75), 16 states have internal predecessors, (75), 6 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-12-16 20:34:27,530 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-16 20:34:27,530 INFO L93 Difference]: Finished difference Result 300 states and 385 transitions. [2021-12-16 20:34:27,530 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-12-16 20:34:27,530 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 4.6875) internal successors, (75), 16 states have internal predecessors, (75), 6 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Word has length 43 [2021-12-16 20:34:27,531 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-16 20:34:27,531 INFO L225 Difference]: With dead ends: 300 [2021-12-16 20:34:27,531 INFO L226 Difference]: Without dead ends: 250 [2021-12-16 20:34:27,532 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 85 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 91 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=118, Invalid=388, Unknown=0, NotChecked=0, Total=506 [2021-12-16 20:34:27,532 INFO L933 BasicCegarLoop]: 59 mSDtfsCounter, 79 mSDsluCounter, 444 mSDsCounter, 0 mSdLazyCounter, 213 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 81 SdHoareTripleChecker+Valid, 503 SdHoareTripleChecker+Invalid, 245 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 213 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-16 20:34:27,532 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [81 Valid, 503 Invalid, 245 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 213 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-16 20:34:27,533 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 250 states. [2021-12-16 20:34:27,558 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 250 to 240. [2021-12-16 20:34:27,559 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 240 states, 228 states have (on average 1.2982456140350878) internal successors, (296), 229 states have internal predecessors, (296), 8 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-12-16 20:34:27,560 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 240 states to 240 states and 311 transitions. [2021-12-16 20:34:27,560 INFO L78 Accepts]: Start accepts. Automaton has 240 states and 311 transitions. Word has length 43 [2021-12-16 20:34:27,560 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-16 20:34:27,560 INFO L470 AbstractCegarLoop]: Abstraction has 240 states and 311 transitions. [2021-12-16 20:34:27,560 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 4.6875) internal successors, (75), 16 states have internal predecessors, (75), 6 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-12-16 20:34:27,560 INFO L276 IsEmpty]: Start isEmpty. Operand 240 states and 311 transitions. [2021-12-16 20:34:27,561 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-12-16 20:34:27,561 INFO L506 BasicCegarLoop]: Found error trace [2021-12-16 20:34:27,561 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-16 20:34:27,577 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-12-16 20:34:27,767 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,18 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-16 20:34:27,767 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-16 20:34:27,768 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-16 20:34:27,768 INFO L85 PathProgramCache]: Analyzing trace with hash -1477368771, now seen corresponding path program 3 times [2021-12-16 20:34:27,768 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-16 20:34:27,768 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [549234468] [2021-12-16 20:34:27,768 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 20:34:27,768 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-16 20:34:27,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:34:28,087 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 3 proven. 15 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-12-16 20:34:28,087 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-16 20:34:28,087 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [549234468] [2021-12-16 20:34:28,087 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [549234468] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-16 20:34:28,087 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1332485734] [2021-12-16 20:34:28,087 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-16 20:34:28,087 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-16 20:34:28,087 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-16 20:34:28,092 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) [2021-12-16 20:34:28,094 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-12-16 20:34:28,218 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-12-16 20:34:28,218 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-16 20:34:28,220 INFO L263 TraceCheckSpWp]: Trace formula consists of 187 conjuncts, 52 conjunts are in the unsatisfiable core [2021-12-16 20:34:28,221 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-16 20:34:28,257 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-12-16 20:34:28,534 INFO L354 Elim1Store]: treesize reduction 99, result has 27.2 percent of original size [2021-12-16 20:34:28,535 INFO L388 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 82 treesize of output 71 [2021-12-16 20:34:28,584 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 3 proven. 11 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-12-16 20:34:28,584 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-16 20:34:29,012 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 6 proven. 4 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-12-16 20:34:29,012 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1332485734] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-16 20:34:29,012 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-16 20:34:29,012 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13, 14] total 36 [2021-12-16 20:34:29,012 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [748234838] [2021-12-16 20:34:29,012 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-16 20:34:29,013 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-12-16 20:34:29,013 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-16 20:34:29,013 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-12-16 20:34:29,013 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=146, Invalid=1114, Unknown=0, NotChecked=0, Total=1260 [2021-12-16 20:34:29,014 INFO L87 Difference]: Start difference. First operand 240 states and 311 transitions. Second operand has 36 states, 35 states have (on average 2.5428571428571427) internal successors, (89), 35 states have internal predecessors, (89), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-16 20:34:30,226 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-16 20:34:30,227 INFO L93 Difference]: Finished difference Result 499 states and 664 transitions. [2021-12-16 20:34:30,227 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-12-16 20:34:30,227 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 35 states have (on average 2.5428571428571427) internal successors, (89), 35 states have internal predecessors, (89), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 41 [2021-12-16 20:34:30,227 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-16 20:34:30,228 INFO L225 Difference]: With dead ends: 499 [2021-12-16 20:34:30,229 INFO L226 Difference]: Without dead ends: 453 [2021-12-16 20:34:30,229 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 62 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 506 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=317, Invalid=2133, Unknown=0, NotChecked=0, Total=2450 [2021-12-16 20:34:30,229 INFO L933 BasicCegarLoop]: 97 mSDtfsCounter, 570 mSDsluCounter, 1474 mSDsCounter, 0 mSdLazyCounter, 1259 mSolverCounterSat, 140 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 578 SdHoareTripleChecker+Valid, 1571 SdHoareTripleChecker+Invalid, 1399 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 140 IncrementalHoareTripleChecker+Valid, 1259 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-12-16 20:34:30,230 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [578 Valid, 1571 Invalid, 1399 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [140 Valid, 1259 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-12-16 20:34:30,230 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 453 states. [2021-12-16 20:34:30,255 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 453 to 265. [2021-12-16 20:34:30,255 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 265 states, 253 states have (on average 1.300395256916996) internal successors, (329), 254 states have internal predecessors, (329), 8 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-12-16 20:34:30,256 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 265 states to 265 states and 344 transitions. [2021-12-16 20:34:30,256 INFO L78 Accepts]: Start accepts. Automaton has 265 states and 344 transitions. Word has length 41 [2021-12-16 20:34:30,256 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-16 20:34:30,256 INFO L470 AbstractCegarLoop]: Abstraction has 265 states and 344 transitions. [2021-12-16 20:34:30,257 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 35 states have (on average 2.5428571428571427) internal successors, (89), 35 states have internal predecessors, (89), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-16 20:34:30,257 INFO L276 IsEmpty]: Start isEmpty. Operand 265 states and 344 transitions. [2021-12-16 20:34:30,257 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-12-16 20:34:30,257 INFO L506 BasicCegarLoop]: Found error trace [2021-12-16 20:34:30,257 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-16 20:34:30,273 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-12-16 20:34:30,459 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,19 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-16 20:34:30,459 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-16 20:34:30,460 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-16 20:34:30,460 INFO L85 PathProgramCache]: Analyzing trace with hash -374018524, now seen corresponding path program 2 times [2021-12-16 20:34:30,460 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-16 20:34:30,460 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1830083754] [2021-12-16 20:34:30,460 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 20:34:30,460 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-16 20:34:30,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:34:30,591 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-12-16 20:34:30,591 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-16 20:34:30,591 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1830083754] [2021-12-16 20:34:30,591 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1830083754] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-16 20:34:30,591 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [843947317] [2021-12-16 20:34:30,591 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-16 20:34:30,591 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-16 20:34:30,591 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-16 20:34:30,592 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) [2021-12-16 20:34:30,636 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-12-16 20:34:30,674 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-16 20:34:30,674 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-16 20:34:30,675 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 21 conjunts are in the unsatisfiable core [2021-12-16 20:34:30,676 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-16 20:34:30,928 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-12-16 20:34:30,928 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-16 20:34:31,127 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-12-16 20:34:31,128 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [843947317] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-16 20:34:31,128 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-16 20:34:31,128 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 12, 10] total 24 [2021-12-16 20:34:31,128 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1862467312] [2021-12-16 20:34:31,128 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-16 20:34:31,129 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-12-16 20:34:31,129 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-16 20:34:31,129 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-12-16 20:34:31,129 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=470, Unknown=0, NotChecked=0, Total=552 [2021-12-16 20:34:31,129 INFO L87 Difference]: Start difference. First operand 265 states and 344 transitions. Second operand has 24 states, 24 states have (on average 3.7916666666666665) internal successors, (91), 24 states have internal predecessors, (91), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-16 20:34:33,478 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-16 20:34:33,479 INFO L93 Difference]: Finished difference Result 1785 states and 2402 transitions. [2021-12-16 20:34:33,479 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2021-12-16 20:34:33,479 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 3.7916666666666665) internal successors, (91), 24 states have internal predecessors, (91), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 42 [2021-12-16 20:34:33,479 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-16 20:34:33,483 INFO L225 Difference]: With dead ends: 1785 [2021-12-16 20:34:33,483 INFO L226 Difference]: Without dead ends: 1745 [2021-12-16 20:34:33,485 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 68 SyntacticMatches, 4 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1638 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1067, Invalid=4785, Unknown=0, NotChecked=0, Total=5852 [2021-12-16 20:34:33,485 INFO L933 BasicCegarLoop]: 220 mSDtfsCounter, 2411 mSDsluCounter, 1514 mSDsCounter, 0 mSdLazyCounter, 945 mSolverCounterSat, 504 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2415 SdHoareTripleChecker+Valid, 1734 SdHoareTripleChecker+Invalid, 1449 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 504 IncrementalHoareTripleChecker+Valid, 945 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-12-16 20:34:33,485 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2415 Valid, 1734 Invalid, 1449 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [504 Valid, 945 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-12-16 20:34:33,486 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1745 states. [2021-12-16 20:34:33,526 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1745 to 297. [2021-12-16 20:34:33,531 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 297 states, 285 states have (on average 1.3368421052631578) internal successors, (381), 286 states have internal predecessors, (381), 8 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-12-16 20:34:33,532 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 297 states to 297 states and 396 transitions. [2021-12-16 20:34:33,532 INFO L78 Accepts]: Start accepts. Automaton has 297 states and 396 transitions. Word has length 42 [2021-12-16 20:34:33,532 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-16 20:34:33,533 INFO L470 AbstractCegarLoop]: Abstraction has 297 states and 396 transitions. [2021-12-16 20:34:33,533 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 3.7916666666666665) internal successors, (91), 24 states have internal predecessors, (91), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-16 20:34:33,533 INFO L276 IsEmpty]: Start isEmpty. Operand 297 states and 396 transitions. [2021-12-16 20:34:33,534 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-12-16 20:34:33,534 INFO L506 BasicCegarLoop]: Found error trace [2021-12-16 20:34:33,534 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-16 20:34:33,552 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-12-16 20:34:33,752 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,20 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-16 20:34:33,752 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-16 20:34:33,753 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-16 20:34:33,753 INFO L85 PathProgramCache]: Analyzing trace with hash 841725603, now seen corresponding path program 2 times [2021-12-16 20:34:33,753 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-16 20:34:33,753 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [820949718] [2021-12-16 20:34:33,753 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 20:34:33,753 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-16 20:34:33,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:34:33,856 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 35 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-12-16 20:34:33,856 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-16 20:34:33,856 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [820949718] [2021-12-16 20:34:33,856 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [820949718] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-16 20:34:33,856 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [938378506] [2021-12-16 20:34:33,856 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-16 20:34:33,857 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-16 20:34:33,857 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-16 20:34:33,857 INFO L229 MonitoredProcess]: Starting monitored process 21 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-16 20:34:33,859 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-12-16 20:34:33,922 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-16 20:34:33,922 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-16 20:34:33,923 INFO L263 TraceCheckSpWp]: Trace formula consists of 203 conjuncts, 14 conjunts are in the unsatisfiable core [2021-12-16 20:34:33,924 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-16 20:34:34,049 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 16 proven. 5 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-12-16 20:34:34,049 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-16 20:34:34,177 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 16 proven. 2 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-12-16 20:34:34,177 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [938378506] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-16 20:34:34,177 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-16 20:34:34,177 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 8, 7] total 21 [2021-12-16 20:34:34,177 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1395877726] [2021-12-16 20:34:34,177 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-16 20:34:34,177 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-12-16 20:34:34,177 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-16 20:34:34,178 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-12-16 20:34:34,178 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=373, Unknown=0, NotChecked=0, Total=420 [2021-12-16 20:34:34,178 INFO L87 Difference]: Start difference. First operand 297 states and 396 transitions. Second operand has 21 states, 20 states have (on average 3.9) internal successors, (78), 20 states have internal predecessors, (78), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-16 20:34:34,573 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-16 20:34:34,574 INFO L93 Difference]: Finished difference Result 400 states and 533 transitions. [2021-12-16 20:34:34,574 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-12-16 20:34:34,574 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 3.9) internal successors, (78), 20 states have internal predecessors, (78), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 43 [2021-12-16 20:34:34,574 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-16 20:34:34,575 INFO L225 Difference]: With dead ends: 400 [2021-12-16 20:34:34,575 INFO L226 Difference]: Without dead ends: 353 [2021-12-16 20:34:34,575 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 77 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=94, Invalid=608, Unknown=0, NotChecked=0, Total=702 [2021-12-16 20:34:34,576 INFO L933 BasicCegarLoop]: 77 mSDtfsCounter, 77 mSDsluCounter, 1181 mSDsCounter, 0 mSdLazyCounter, 635 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 77 SdHoareTripleChecker+Valid, 1258 SdHoareTripleChecker+Invalid, 658 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 635 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-16 20:34:34,576 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [77 Valid, 1258 Invalid, 658 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 635 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-12-16 20:34:34,576 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 353 states. [2021-12-16 20:34:34,613 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 353 to 313. [2021-12-16 20:34:34,614 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 313 states, 301 states have (on average 1.3388704318936877) internal successors, (403), 302 states have internal predecessors, (403), 8 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-12-16 20:34:34,614 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 313 states to 313 states and 418 transitions. [2021-12-16 20:34:34,615 INFO L78 Accepts]: Start accepts. Automaton has 313 states and 418 transitions. Word has length 43 [2021-12-16 20:34:34,615 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-16 20:34:34,615 INFO L470 AbstractCegarLoop]: Abstraction has 313 states and 418 transitions. [2021-12-16 20:34:34,615 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 20 states have (on average 3.9) internal successors, (78), 20 states have internal predecessors, (78), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-16 20:34:34,615 INFO L276 IsEmpty]: Start isEmpty. Operand 313 states and 418 transitions. [2021-12-16 20:34:34,616 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-12-16 20:34:34,616 INFO L506 BasicCegarLoop]: Found error trace [2021-12-16 20:34:34,616 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-16 20:34:34,632 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Ended with exit code 0 [2021-12-16 20:34:34,831 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2021-12-16 20:34:34,831 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-16 20:34:34,832 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-16 20:34:34,832 INFO L85 PathProgramCache]: Analyzing trace with hash 1064658949, now seen corresponding path program 1 times [2021-12-16 20:34:34,832 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-16 20:34:34,832 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1472407886] [2021-12-16 20:34:34,832 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 20:34:34,832 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-16 20:34:34,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:34:34,916 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2021-12-16 20:34:34,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:34:34,919 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 31 [2021-12-16 20:34:34,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:34:34,922 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 3 proven. 3 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-12-16 20:34:34,922 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-16 20:34:34,922 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1472407886] [2021-12-16 20:34:34,922 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1472407886] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-16 20:34:34,922 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [99379146] [2021-12-16 20:34:34,923 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 20:34:34,923 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-16 20:34:34,923 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-16 20:34:34,924 INFO L229 MonitoredProcess]: Starting monitored process 22 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-16 20:34:34,925 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-12-16 20:34:34,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:34:34,985 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 14 conjunts are in the unsatisfiable core [2021-12-16 20:34:34,986 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-16 20:34:35,119 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-12-16 20:34:35,119 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-16 20:34:35,257 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-12-16 20:34:35,257 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [99379146] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-16 20:34:35,257 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-16 20:34:35,257 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 7] total 15 [2021-12-16 20:34:35,257 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [344704894] [2021-12-16 20:34:35,257 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-16 20:34:35,258 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-12-16 20:34:35,258 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-16 20:34:35,258 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-12-16 20:34:35,258 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2021-12-16 20:34:35,259 INFO L87 Difference]: Start difference. First operand 313 states and 418 transitions. Second operand has 15 states, 15 states have (on average 3.8666666666666667) internal successors, (58), 15 states have internal predecessors, (58), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-12-16 20:34:35,485 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-16 20:34:35,485 INFO L93 Difference]: Finished difference Result 357 states and 470 transitions. [2021-12-16 20:34:35,485 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-12-16 20:34:35,485 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 3.8666666666666667) internal successors, (58), 15 states have internal predecessors, (58), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 46 [2021-12-16 20:34:35,486 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-16 20:34:35,486 INFO L225 Difference]: With dead ends: 357 [2021-12-16 20:34:35,486 INFO L226 Difference]: Without dead ends: 309 [2021-12-16 20:34:35,487 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 87 SyntacticMatches, 4 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=84, Invalid=296, Unknown=0, NotChecked=0, Total=380 [2021-12-16 20:34:35,487 INFO L933 BasicCegarLoop]: 53 mSDtfsCounter, 64 mSDsluCounter, 448 mSDsCounter, 0 mSdLazyCounter, 224 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 501 SdHoareTripleChecker+Invalid, 250 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 224 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-16 20:34:35,488 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [65 Valid, 501 Invalid, 250 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 224 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-16 20:34:35,488 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 309 states. [2021-12-16 20:34:35,524 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 309 to 306. [2021-12-16 20:34:35,525 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 306 states, 294 states have (on average 1.336734693877551) internal successors, (393), 295 states have internal predecessors, (393), 8 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-12-16 20:34:35,525 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 306 states to 306 states and 408 transitions. [2021-12-16 20:34:35,525 INFO L78 Accepts]: Start accepts. Automaton has 306 states and 408 transitions. Word has length 46 [2021-12-16 20:34:35,525 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-16 20:34:35,526 INFO L470 AbstractCegarLoop]: Abstraction has 306 states and 408 transitions. [2021-12-16 20:34:35,526 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 3.8666666666666667) internal successors, (58), 15 states have internal predecessors, (58), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-12-16 20:34:35,526 INFO L276 IsEmpty]: Start isEmpty. Operand 306 states and 408 transitions. [2021-12-16 20:34:35,526 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-12-16 20:34:35,526 INFO L506 BasicCegarLoop]: Found error trace [2021-12-16 20:34:35,527 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-16 20:34:35,544 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2021-12-16 20:34:35,735 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-12-16 20:34:35,735 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-16 20:34:35,735 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-16 20:34:35,736 INFO L85 PathProgramCache]: Analyzing trace with hash 1968671326, now seen corresponding path program 4 times [2021-12-16 20:34:35,736 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-16 20:34:35,736 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2092272132] [2021-12-16 20:34:35,736 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 20:34:35,736 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-16 20:34:35,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:34:36,016 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-12-16 20:34:36,016 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-16 20:34:36,017 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2092272132] [2021-12-16 20:34:36,017 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2092272132] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-16 20:34:36,017 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [505147882] [2021-12-16 20:34:36,017 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-16 20:34:36,017 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-16 20:34:36,017 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-16 20:34:36,018 INFO L229 MonitoredProcess]: Starting monitored process 23 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-16 20:34:36,019 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-12-16 20:34:36,089 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-16 20:34:36,089 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-16 20:34:36,090 INFO L263 TraceCheckSpWp]: Trace formula consists of 206 conjuncts, 24 conjunts are in the unsatisfiable core [2021-12-16 20:34:36,091 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-16 20:34:36,285 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 7 proven. 9 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-12-16 20:34:36,285 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-16 20:34:36,498 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 7 proven. 9 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-12-16 20:34:36,498 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [505147882] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-16 20:34:36,499 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-16 20:34:36,499 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 10, 10] total 32 [2021-12-16 20:34:36,499 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1755097081] [2021-12-16 20:34:36,499 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-16 20:34:36,499 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-12-16 20:34:36,499 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-16 20:34:36,500 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-12-16 20:34:36,500 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=897, Unknown=0, NotChecked=0, Total=992 [2021-12-16 20:34:36,500 INFO L87 Difference]: Start difference. First operand 306 states and 408 transitions. Second operand has 32 states, 32 states have (on average 2.6875) internal successors, (86), 32 states have internal predecessors, (86), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-16 20:34:42,168 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-12-16 20:34:44,177 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-16 20:34:44,177 INFO L93 Difference]: Finished difference Result 1587 states and 2133 transitions. [2021-12-16 20:34:44,178 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2021-12-16 20:34:44,178 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 2.6875) internal successors, (86), 32 states have internal predecessors, (86), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 44 [2021-12-16 20:34:44,178 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-16 20:34:44,181 INFO L225 Difference]: With dead ends: 1587 [2021-12-16 20:34:44,181 INFO L226 Difference]: Without dead ends: 1320 [2021-12-16 20:34:44,183 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 74 SyntacticMatches, 0 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2020 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=1163, Invalid=7027, Unknown=0, NotChecked=0, Total=8190 [2021-12-16 20:34:44,183 INFO L933 BasicCegarLoop]: 157 mSDtfsCounter, 3325 mSDsluCounter, 2135 mSDsCounter, 0 mSdLazyCounter, 1982 mSolverCounterSat, 659 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3328 SdHoareTripleChecker+Valid, 2292 SdHoareTripleChecker+Invalid, 2642 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 659 IncrementalHoareTripleChecker+Valid, 1982 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.1s IncrementalHoareTripleChecker+Time [2021-12-16 20:34:44,184 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3328 Valid, 2292 Invalid, 2642 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [659 Valid, 1982 Invalid, 1 Unknown, 0 Unchecked, 4.1s Time] [2021-12-16 20:34:44,185 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1320 states. [2021-12-16 20:34:44,238 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1320 to 374. [2021-12-16 20:34:44,239 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 374 states, 362 states have (on average 1.3232044198895028) internal successors, (479), 363 states have internal predecessors, (479), 8 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-12-16 20:34:44,240 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 374 states to 374 states and 494 transitions. [2021-12-16 20:34:44,240 INFO L78 Accepts]: Start accepts. Automaton has 374 states and 494 transitions. Word has length 44 [2021-12-16 20:34:44,240 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-16 20:34:44,240 INFO L470 AbstractCegarLoop]: Abstraction has 374 states and 494 transitions. [2021-12-16 20:34:44,240 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 2.6875) internal successors, (86), 32 states have internal predecessors, (86), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-16 20:34:44,240 INFO L276 IsEmpty]: Start isEmpty. Operand 374 states and 494 transitions. [2021-12-16 20:34:44,241 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-12-16 20:34:44,241 INFO L506 BasicCegarLoop]: Found error trace [2021-12-16 20:34:44,241 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-16 20:34:44,260 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-12-16 20:34:44,457 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-12-16 20:34:44,458 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-16 20:34:44,458 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-16 20:34:44,458 INFO L85 PathProgramCache]: Analyzing trace with hash 1011805829, now seen corresponding path program 1 times [2021-12-16 20:34:44,458 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-16 20:34:44,458 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1273862116] [2021-12-16 20:34:44,458 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 20:34:44,458 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-16 20:34:44,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:34:44,746 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 22 [2021-12-16 20:34:44,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:34:44,751 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 33 [2021-12-16 20:34:44,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:34:44,753 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-16 20:34:44,753 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-16 20:34:44,753 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1273862116] [2021-12-16 20:34:44,753 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1273862116] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-16 20:34:44,753 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [127920560] [2021-12-16 20:34:44,753 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 20:34:44,754 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-16 20:34:44,754 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-16 20:34:44,755 INFO L229 MonitoredProcess]: Starting monitored process 24 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-16 20:34:44,756 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-12-16 20:34:44,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:34:44,820 INFO L263 TraceCheckSpWp]: Trace formula consists of 186 conjuncts, 23 conjunts are in the unsatisfiable core [2021-12-16 20:34:44,821 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-16 20:34:45,058 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-12-16 20:34:45,059 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-16 20:34:45,309 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-12-16 20:34:45,309 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [127920560] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-16 20:34:45,309 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-16 20:34:45,309 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 9, 8] total 27 [2021-12-16 20:34:45,309 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [744827294] [2021-12-16 20:34:45,309 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-16 20:34:45,310 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-12-16 20:34:45,310 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-16 20:34:45,310 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-12-16 20:34:45,310 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=618, Unknown=0, NotChecked=0, Total=702 [2021-12-16 20:34:45,310 INFO L87 Difference]: Start difference. First operand 374 states and 494 transitions. Second operand has 27 states, 27 states have (on average 3.0) internal successors, (81), 27 states have internal predecessors, (81), 5 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-12-16 20:34:47,346 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-16 20:34:47,346 INFO L93 Difference]: Finished difference Result 812 states and 1065 transitions. [2021-12-16 20:34:47,346 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-12-16 20:34:47,346 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 3.0) internal successors, (81), 27 states have internal predecessors, (81), 5 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Word has length 48 [2021-12-16 20:34:47,347 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-16 20:34:47,348 INFO L225 Difference]: With dead ends: 812 [2021-12-16 20:34:47,348 INFO L226 Difference]: Without dead ends: 728 [2021-12-16 20:34:47,349 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 90 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 718 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=589, Invalid=2833, Unknown=0, NotChecked=0, Total=3422 [2021-12-16 20:34:47,349 INFO L933 BasicCegarLoop]: 96 mSDtfsCounter, 1273 mSDsluCounter, 1049 mSDsCounter, 0 mSdLazyCounter, 1057 mSolverCounterSat, 263 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1273 SdHoareTripleChecker+Valid, 1145 SdHoareTripleChecker+Invalid, 1320 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 263 IncrementalHoareTripleChecker+Valid, 1057 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-12-16 20:34:47,350 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1273 Valid, 1145 Invalid, 1320 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [263 Valid, 1057 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-12-16 20:34:47,350 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 728 states. [2021-12-16 20:34:47,407 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 728 to 375. [2021-12-16 20:34:47,408 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 375 states, 363 states have (on average 1.303030303030303) internal successors, (473), 364 states have internal predecessors, (473), 8 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-12-16 20:34:47,408 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 375 states to 375 states and 488 transitions. [2021-12-16 20:34:47,408 INFO L78 Accepts]: Start accepts. Automaton has 375 states and 488 transitions. Word has length 48 [2021-12-16 20:34:47,408 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-16 20:34:47,408 INFO L470 AbstractCegarLoop]: Abstraction has 375 states and 488 transitions. [2021-12-16 20:34:47,408 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 3.0) internal successors, (81), 27 states have internal predecessors, (81), 5 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-12-16 20:34:47,409 INFO L276 IsEmpty]: Start isEmpty. Operand 375 states and 488 transitions. [2021-12-16 20:34:47,409 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-12-16 20:34:47,409 INFO L506 BasicCegarLoop]: Found error trace [2021-12-16 20:34:47,409 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-16 20:34:47,425 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Ended with exit code 0 [2021-12-16 20:34:47,610 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28,24 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-16 20:34:47,610 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-16 20:34:47,610 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-16 20:34:47,611 INFO L85 PathProgramCache]: Analyzing trace with hash -1719898279, now seen corresponding path program 3 times [2021-12-16 20:34:47,611 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-16 20:34:47,611 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1229539138] [2021-12-16 20:34:47,611 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 20:34:47,611 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-16 20:34:47,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:34:48,103 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 5 proven. 24 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-12-16 20:34:48,103 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-16 20:34:48,103 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1229539138] [2021-12-16 20:34:48,103 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1229539138] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-16 20:34:48,103 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1698191182] [2021-12-16 20:34:48,103 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-16 20:34:48,103 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-16 20:34:48,103 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-16 20:34:48,104 INFO L229 MonitoredProcess]: Starting monitored process 25 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-16 20:34:48,105 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-12-16 20:34:48,283 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-12-16 20:34:48,283 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-16 20:34:48,285 INFO L263 TraceCheckSpWp]: Trace formula consists of 190 conjuncts, 43 conjunts are in the unsatisfiable core [2021-12-16 20:34:48,286 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-16 20:34:48,331 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-16 20:34:48,521 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-12-16 20:34:48,521 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 26 treesize of output 10 [2021-12-16 20:34:48,549 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 5 proven. 4 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2021-12-16 20:34:48,550 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-16 20:34:48,719 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2021-12-16 20:34:48,719 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1698191182] provided 1 perfect and 1 imperfect interpolant sequences [2021-12-16 20:34:48,719 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-12-16 20:34:48,719 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [19, 9] total 29 [2021-12-16 20:34:48,719 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1851239698] [2021-12-16 20:34:48,719 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-16 20:34:48,720 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-12-16 20:34:48,720 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-16 20:34:48,720 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-12-16 20:34:48,720 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=706, Unknown=0, NotChecked=0, Total=812 [2021-12-16 20:34:48,720 INFO L87 Difference]: Start difference. First operand 375 states and 488 transitions. Second operand has 8 states, 8 states have (on average 3.875) internal successors, (31), 8 states have internal predecessors, (31), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-16 20:34:48,963 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-16 20:34:48,963 INFO L93 Difference]: Finished difference Result 561 states and 741 transitions. [2021-12-16 20:34:48,964 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-12-16 20:34:48,964 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.875) internal successors, (31), 8 states have internal predecessors, (31), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 47 [2021-12-16 20:34:48,964 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-16 20:34:48,965 INFO L225 Difference]: With dead ends: 561 [2021-12-16 20:34:48,965 INFO L226 Difference]: Without dead ends: 481 [2021-12-16 20:34:48,966 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 84 SyntacticMatches, 1 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 288 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=144, Invalid=912, Unknown=0, NotChecked=0, Total=1056 [2021-12-16 20:34:48,966 INFO L933 BasicCegarLoop]: 68 mSDtfsCounter, 96 mSDsluCounter, 225 mSDsCounter, 0 mSdLazyCounter, 131 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 104 SdHoareTripleChecker+Valid, 293 SdHoareTripleChecker+Invalid, 144 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 131 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-16 20:34:48,966 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [104 Valid, 293 Invalid, 144 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 131 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-16 20:34:48,967 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 481 states. [2021-12-16 20:34:49,018 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 481 to 375. [2021-12-16 20:34:49,019 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 375 states, 363 states have (on average 1.2865013774104683) internal successors, (467), 364 states have internal predecessors, (467), 8 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-12-16 20:34:49,019 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 375 states to 375 states and 482 transitions. [2021-12-16 20:34:49,019 INFO L78 Accepts]: Start accepts. Automaton has 375 states and 482 transitions. Word has length 47 [2021-12-16 20:34:49,019 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-16 20:34:49,020 INFO L470 AbstractCegarLoop]: Abstraction has 375 states and 482 transitions. [2021-12-16 20:34:49,020 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 3.875) internal successors, (31), 8 states have internal predecessors, (31), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-16 20:34:49,020 INFO L276 IsEmpty]: Start isEmpty. Operand 375 states and 482 transitions. [2021-12-16 20:34:49,020 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-12-16 20:34:49,020 INFO L506 BasicCegarLoop]: Found error trace [2021-12-16 20:34:49,020 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-16 20:34:49,024 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Ended with exit code 0 [2021-12-16 20:34:49,224 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,25 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-16 20:34:49,224 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-16 20:34:49,224 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-16 20:34:49,224 INFO L85 PathProgramCache]: Analyzing trace with hash 862887189, now seen corresponding path program 4 times [2021-12-16 20:34:49,225 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-16 20:34:49,225 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1167599356] [2021-12-16 20:34:49,225 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 20:34:49,225 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-16 20:34:49,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:34:49,682 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 5 proven. 24 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-12-16 20:34:49,683 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-16 20:34:49,684 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1167599356] [2021-12-16 20:34:49,684 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1167599356] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-16 20:34:49,684 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1351038282] [2021-12-16 20:34:49,684 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-16 20:34:49,684 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-16 20:34:49,684 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-16 20:34:49,685 INFO L229 MonitoredProcess]: Starting monitored process 26 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-16 20:34:49,685 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2021-12-16 20:34:49,764 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-16 20:34:49,764 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-16 20:34:49,765 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 63 conjunts are in the unsatisfiable core [2021-12-16 20:34:49,766 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-16 20:34:49,846 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-16 20:34:50,260 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-16 20:34:50,261 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-16 20:34:50,279 INFO L354 Elim1Store]: treesize reduction 19, result has 70.3 percent of original size [2021-12-16 20:34:50,279 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 77 treesize of output 79 [2021-12-16 20:34:50,318 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 5 proven. 28 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-12-16 20:34:50,318 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-16 20:34:50,871 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 3 proven. 17 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-12-16 20:34:50,872 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1351038282] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-16 20:34:50,872 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-16 20:34:50,872 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18, 17] total 50 [2021-12-16 20:34:50,872 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1918614059] [2021-12-16 20:34:50,872 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-16 20:34:50,873 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2021-12-16 20:34:50,873 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-16 20:34:50,873 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-12-16 20:34:50,874 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=288, Invalid=2162, Unknown=0, NotChecked=0, Total=2450 [2021-12-16 20:34:50,874 INFO L87 Difference]: Start difference. First operand 375 states and 482 transitions. Second operand has 50 states, 50 states have (on average 2.3) internal successors, (115), 49 states have internal predecessors, (115), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-16 20:34:52,664 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-16 20:34:52,664 INFO L93 Difference]: Finished difference Result 870 states and 1133 transitions. [2021-12-16 20:34:52,665 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-12-16 20:34:52,665 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 2.3) internal successors, (115), 49 states have internal predecessors, (115), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 47 [2021-12-16 20:34:52,665 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-16 20:34:52,667 INFO L225 Difference]: With dead ends: 870 [2021-12-16 20:34:52,667 INFO L226 Difference]: Without dead ends: 724 [2021-12-16 20:34:52,668 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 64 SyntacticMatches, 0 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1346 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=661, Invalid=4169, Unknown=0, NotChecked=0, Total=4830 [2021-12-16 20:34:52,668 INFO L933 BasicCegarLoop]: 116 mSDtfsCounter, 246 mSDsluCounter, 2001 mSDsCounter, 0 mSdLazyCounter, 1473 mSolverCounterSat, 66 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 254 SdHoareTripleChecker+Valid, 2117 SdHoareTripleChecker+Invalid, 1539 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 66 IncrementalHoareTripleChecker+Valid, 1473 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-12-16 20:34:52,668 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [254 Valid, 2117 Invalid, 1539 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [66 Valid, 1473 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-12-16 20:34:52,669 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 724 states. [2021-12-16 20:34:52,732 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 724 to 399. [2021-12-16 20:34:52,733 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 399 states, 387 states have (on average 1.2790697674418605) internal successors, (495), 388 states have internal predecessors, (495), 8 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-12-16 20:34:52,733 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 399 states to 399 states and 510 transitions. [2021-12-16 20:34:52,733 INFO L78 Accepts]: Start accepts. Automaton has 399 states and 510 transitions. Word has length 47 [2021-12-16 20:34:52,734 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-16 20:34:52,734 INFO L470 AbstractCegarLoop]: Abstraction has 399 states and 510 transitions. [2021-12-16 20:34:52,735 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 2.3) internal successors, (115), 49 states have internal predecessors, (115), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-16 20:34:52,735 INFO L276 IsEmpty]: Start isEmpty. Operand 399 states and 510 transitions. [2021-12-16 20:34:52,736 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-12-16 20:34:52,736 INFO L506 BasicCegarLoop]: Found error trace [2021-12-16 20:34:52,736 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-16 20:34:52,752 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2021-12-16 20:34:52,948 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable30 [2021-12-16 20:34:52,949 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-16 20:34:52,949 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-16 20:34:52,949 INFO L85 PathProgramCache]: Analyzing trace with hash -144056787, now seen corresponding path program 5 times [2021-12-16 20:34:52,949 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-16 20:34:52,949 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1307734137] [2021-12-16 20:34:52,949 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 20:34:52,949 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-16 20:34:52,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:34:53,388 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 5 proven. 24 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-12-16 20:34:53,388 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-16 20:34:53,388 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1307734137] [2021-12-16 20:34:53,388 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1307734137] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-16 20:34:53,388 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1338711005] [2021-12-16 20:34:53,388 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-12-16 20:34:53,389 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-16 20:34:53,389 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-16 20:34:53,389 INFO L229 MonitoredProcess]: Starting monitored process 27 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-16 20:34:53,390 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2021-12-16 20:34:53,602 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-12-16 20:34:53,603 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-16 20:34:53,605 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 73 conjunts are in the unsatisfiable core [2021-12-16 20:34:53,607 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-16 20:34:53,617 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-12-16 20:34:53,700 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-12-16 20:34:53,761 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-16 20:34:53,795 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-16 20:34:53,810 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-16 20:34:54,407 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-16 20:34:54,407 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-16 20:34:54,408 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 73 treesize of output 35 [2021-12-16 20:34:54,438 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 5 proven. 32 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-16 20:34:54,438 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-16 20:34:55,035 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 5 proven. 15 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-12-16 20:34:55,035 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1338711005] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-16 20:34:55,035 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-16 20:34:55,035 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 20, 17] total 52 [2021-12-16 20:34:55,035 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [807502850] [2021-12-16 20:34:55,035 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-16 20:34:55,036 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2021-12-16 20:34:55,036 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-16 20:34:55,036 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-12-16 20:34:55,036 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=306, Invalid=2346, Unknown=0, NotChecked=0, Total=2652 [2021-12-16 20:34:55,037 INFO L87 Difference]: Start difference. First operand 399 states and 510 transitions. Second operand has 52 states, 52 states have (on average 2.25) internal successors, (117), 51 states have internal predecessors, (117), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-16 20:34:56,636 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-16 20:34:56,637 INFO L93 Difference]: Finished difference Result 884 states and 1157 transitions. [2021-12-16 20:34:56,637 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-12-16 20:34:56,637 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 2.25) internal successors, (117), 51 states have internal predecessors, (117), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 47 [2021-12-16 20:34:56,637 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-16 20:34:56,639 INFO L225 Difference]: With dead ends: 884 [2021-12-16 20:34:56,639 INFO L226 Difference]: Without dead ends: 728 [2021-12-16 20:34:56,639 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 62 SyntacticMatches, 0 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1221 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=584, Invalid=3972, Unknown=0, NotChecked=0, Total=4556 [2021-12-16 20:34:56,640 INFO L933 BasicCegarLoop]: 112 mSDtfsCounter, 426 mSDsluCounter, 1881 mSDsCounter, 0 mSdLazyCounter, 1728 mSolverCounterSat, 103 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 434 SdHoareTripleChecker+Valid, 1993 SdHoareTripleChecker+Invalid, 1831 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 103 IncrementalHoareTripleChecker+Valid, 1728 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-12-16 20:34:56,640 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [434 Valid, 1993 Invalid, 1831 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [103 Valid, 1728 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-12-16 20:34:56,640 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 728 states. [2021-12-16 20:34:56,702 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 728 to 423. [2021-12-16 20:34:56,704 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 423 states, 411 states have (on average 1.2822384428223845) internal successors, (527), 412 states have internal predecessors, (527), 8 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-12-16 20:34:56,704 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 423 states to 423 states and 542 transitions. [2021-12-16 20:34:56,705 INFO L78 Accepts]: Start accepts. Automaton has 423 states and 542 transitions. Word has length 47 [2021-12-16 20:34:56,705 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-16 20:34:56,705 INFO L470 AbstractCegarLoop]: Abstraction has 423 states and 542 transitions. [2021-12-16 20:34:56,705 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 52 states have (on average 2.25) internal successors, (117), 51 states have internal predecessors, (117), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-16 20:34:56,705 INFO L276 IsEmpty]: Start isEmpty. Operand 423 states and 542 transitions. [2021-12-16 20:34:56,706 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-12-16 20:34:56,706 INFO L506 BasicCegarLoop]: Found error trace [2021-12-16 20:34:56,706 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-16 20:34:56,713 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2021-12-16 20:34:56,911 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable31 [2021-12-16 20:34:56,911 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-16 20:34:56,911 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-16 20:34:56,911 INFO L85 PathProgramCache]: Analyzing trace with hash -1449599454, now seen corresponding path program 5 times [2021-12-16 20:34:56,911 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-16 20:34:56,912 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1863204006] [2021-12-16 20:34:56,912 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 20:34:56,912 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-16 20:34:56,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:34:57,191 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-12-16 20:34:57,191 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-16 20:34:57,192 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1863204006] [2021-12-16 20:34:57,192 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1863204006] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-16 20:34:57,192 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1094601241] [2021-12-16 20:34:57,192 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-12-16 20:34:57,192 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-16 20:34:57,192 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-16 20:34:57,193 INFO L229 MonitoredProcess]: Starting monitored process 28 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-16 20:34:57,194 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2021-12-16 20:34:58,050 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2021-12-16 20:34:58,050 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-16 20:34:58,053 INFO L263 TraceCheckSpWp]: Trace formula consists of 224 conjuncts, 25 conjunts are in the unsatisfiable core [2021-12-16 20:34:58,054 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-16 20:34:58,357 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 31 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-12-16 20:34:58,357 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-16 20:34:58,764 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 7 proven. 24 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-12-16 20:34:58,764 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1094601241] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-16 20:34:58,764 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-16 20:34:58,764 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 14, 14] total 36 [2021-12-16 20:34:58,765 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1811899081] [2021-12-16 20:34:58,765 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-16 20:34:58,765 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-12-16 20:34:58,765 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-16 20:34:58,765 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-12-16 20:34:58,765 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=180, Invalid=1080, Unknown=0, NotChecked=0, Total=1260 [2021-12-16 20:34:58,766 INFO L87 Difference]: Start difference. First operand 423 states and 542 transitions. Second operand has 36 states, 36 states have (on average 2.6944444444444446) internal successors, (97), 36 states have internal predecessors, (97), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-16 20:35:10,521 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-16 20:35:10,521 INFO L93 Difference]: Finished difference Result 2413 states and 3147 transitions. [2021-12-16 20:35:10,522 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 136 states. [2021-12-16 20:35:10,522 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 2.6944444444444446) internal successors, (97), 36 states have internal predecessors, (97), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 48 [2021-12-16 20:35:10,522 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-16 20:35:10,527 INFO L225 Difference]: With dead ends: 2413 [2021-12-16 20:35:10,527 INFO L226 Difference]: Without dead ends: 2405 [2021-12-16 20:35:10,529 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 242 GetRequests, 75 SyntacticMatches, 2 SemanticMatches, 165 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8955 ImplicationChecksByTransitivity, 8.9s TimeCoverageRelationStatistics Valid=3683, Invalid=24039, Unknown=0, NotChecked=0, Total=27722 [2021-12-16 20:35:10,530 INFO L933 BasicCegarLoop]: 261 mSDtfsCounter, 4454 mSDsluCounter, 3329 mSDsCounter, 0 mSdLazyCounter, 3267 mSolverCounterSat, 1055 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4458 SdHoareTripleChecker+Valid, 3590 SdHoareTripleChecker+Invalid, 4322 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1055 IncrementalHoareTripleChecker+Valid, 3267 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.7s IncrementalHoareTripleChecker+Time [2021-12-16 20:35:10,530 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4458 Valid, 3590 Invalid, 4322 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1055 Valid, 3267 Invalid, 0 Unknown, 0 Unchecked, 2.7s Time] [2021-12-16 20:35:10,531 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2405 states. [2021-12-16 20:35:10,608 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2405 to 426. [2021-12-16 20:35:10,608 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 426 states, 414 states have (on average 1.2801932367149758) internal successors, (530), 415 states have internal predecessors, (530), 8 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-12-16 20:35:10,609 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 426 states to 426 states and 545 transitions. [2021-12-16 20:35:10,609 INFO L78 Accepts]: Start accepts. Automaton has 426 states and 545 transitions. Word has length 48 [2021-12-16 20:35:10,610 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-16 20:35:10,610 INFO L470 AbstractCegarLoop]: Abstraction has 426 states and 545 transitions. [2021-12-16 20:35:10,610 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 2.6944444444444446) internal successors, (97), 36 states have internal predecessors, (97), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-16 20:35:10,611 INFO L276 IsEmpty]: Start isEmpty. Operand 426 states and 545 transitions. [2021-12-16 20:35:10,613 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-12-16 20:35:10,613 INFO L506 BasicCegarLoop]: Found error trace [2021-12-16 20:35:10,615 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-16 20:35:10,622 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2021-12-16 20:35:10,820 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32,28 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-16 20:35:10,820 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-16 20:35:10,820 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-16 20:35:10,821 INFO L85 PathProgramCache]: Analyzing trace with hash -1577867576, now seen corresponding path program 2 times [2021-12-16 20:35:10,821 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-16 20:35:10,821 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [644659923] [2021-12-16 20:35:10,821 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 20:35:10,821 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-16 20:35:10,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:35:11,107 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2021-12-16 20:35:11,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:35:11,111 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 36 [2021-12-16 20:35:11,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:35:11,125 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 5 proven. 5 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-12-16 20:35:11,125 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-16 20:35:11,125 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [644659923] [2021-12-16 20:35:11,125 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [644659923] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-16 20:35:11,125 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [945842432] [2021-12-16 20:35:11,126 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-16 20:35:11,126 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-16 20:35:11,126 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-16 20:35:11,127 INFO L229 MonitoredProcess]: Starting monitored process 29 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-16 20:35:11,128 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2021-12-16 20:35:11,207 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-16 20:35:11,208 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-16 20:35:11,209 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 42 conjunts are in the unsatisfiable core [2021-12-16 20:35:11,210 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-16 20:35:11,245 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-16 20:35:11,435 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-12-16 20:35:11,436 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 26 treesize of output 10 [2021-12-16 20:35:11,465 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 5 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-12-16 20:35:11,466 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-16 20:35:11,624 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-12-16 20:35:11,624 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [945842432] provided 1 perfect and 1 imperfect interpolant sequences [2021-12-16 20:35:11,624 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-12-16 20:35:11,624 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [14, 11] total 22 [2021-12-16 20:35:11,624 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1127055529] [2021-12-16 20:35:11,624 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-16 20:35:11,624 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-12-16 20:35:11,624 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-16 20:35:11,625 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-12-16 20:35:11,625 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=363, Unknown=0, NotChecked=0, Total=462 [2021-12-16 20:35:11,625 INFO L87 Difference]: Start difference. First operand 426 states and 545 transitions. Second operand has 10 states, 9 states have (on average 4.555555555555555) internal successors, (41), 10 states have internal predecessors, (41), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-16 20:35:11,903 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-16 20:35:11,903 INFO L93 Difference]: Finished difference Result 561 states and 723 transitions. [2021-12-16 20:35:11,903 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-12-16 20:35:11,903 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 4.555555555555555) internal successors, (41), 10 states have internal predecessors, (41), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 51 [2021-12-16 20:35:11,904 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-16 20:35:11,905 INFO L225 Difference]: With dead ends: 561 [2021-12-16 20:35:11,905 INFO L226 Difference]: Without dead ends: 538 [2021-12-16 20:35:11,906 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 92 SyntacticMatches, 7 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 265 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=145, Invalid=505, Unknown=0, NotChecked=0, Total=650 [2021-12-16 20:35:11,906 INFO L933 BasicCegarLoop]: 63 mSDtfsCounter, 151 mSDsluCounter, 253 mSDsCounter, 0 mSdLazyCounter, 155 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 158 SdHoareTripleChecker+Valid, 316 SdHoareTripleChecker+Invalid, 177 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 155 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-16 20:35:11,906 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [158 Valid, 316 Invalid, 177 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 155 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-16 20:35:11,907 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 538 states. [2021-12-16 20:35:11,990 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 538 to 447. [2021-12-16 20:35:11,990 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 447 states, 432 states have (on average 1.2708333333333333) internal successors, (549), 433 states have internal predecessors, (549), 11 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-12-16 20:35:11,991 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 447 states to 447 states and 570 transitions. [2021-12-16 20:35:11,991 INFO L78 Accepts]: Start accepts. Automaton has 447 states and 570 transitions. Word has length 51 [2021-12-16 20:35:11,992 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-16 20:35:11,992 INFO L470 AbstractCegarLoop]: Abstraction has 447 states and 570 transitions. [2021-12-16 20:35:11,992 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 4.555555555555555) internal successors, (41), 10 states have internal predecessors, (41), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-16 20:35:11,992 INFO L276 IsEmpty]: Start isEmpty. Operand 447 states and 570 transitions. [2021-12-16 20:35:11,993 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-12-16 20:35:11,993 INFO L506 BasicCegarLoop]: Found error trace [2021-12-16 20:35:11,993 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-16 20:35:12,012 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2021-12-16 20:35:12,212 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33,29 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-16 20:35:12,212 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-16 20:35:12,212 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-16 20:35:12,212 INFO L85 PathProgramCache]: Analyzing trace with hash 832365819, now seen corresponding path program 1 times [2021-12-16 20:35:12,212 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-16 20:35:12,213 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1557351035] [2021-12-16 20:35:12,213 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 20:35:12,213 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-16 20:35:12,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:35:12,508 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 26 [2021-12-16 20:35:12,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:35:12,517 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2021-12-16 20:35:12,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:35:12,522 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 2 proven. 12 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-12-16 20:35:12,522 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-16 20:35:12,522 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1557351035] [2021-12-16 20:35:12,522 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1557351035] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-16 20:35:12,522 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1725095429] [2021-12-16 20:35:12,522 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 20:35:12,522 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-16 20:35:12,523 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-16 20:35:12,523 INFO L229 MonitoredProcess]: Starting monitored process 30 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-16 20:35:12,524 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2021-12-16 20:35:12,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:35:12,595 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 46 conjunts are in the unsatisfiable core [2021-12-16 20:35:12,596 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-16 20:35:12,636 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-16 20:35:13,546 WARN L860 $PredicateComparison]: unable to prove that (exists ((|v_ULTIMATE.start_main_~a~0#1.base_BEFORE_CALL_3| Int) (|v_ULTIMATE.start_main_~pat~0#1.base_BEFORE_CALL_3| Int) (|v_ULTIMATE.start_main_~pat~0#1.offset_BEFORE_CALL_3| Int)) (= (select (select |c_#memory_int| |v_ULTIMATE.start_main_~a~0#1.base_BEFORE_CALL_3|) 0) (select (select |c_#memory_int| |v_ULTIMATE.start_main_~pat~0#1.base_BEFORE_CALL_3|) (+ |v_ULTIMATE.start_main_~pat~0#1.offset_BEFORE_CALL_3| 4)))) is different from true [2021-12-16 20:35:16,577 WARN L860 $PredicateComparison]: unable to prove that (exists ((|v_ULTIMATE.start_main_~a~0#1.base_BEFORE_CALL_4| Int) (|v_ULTIMATE.start_main_~pat~0#1.base_BEFORE_CALL_4| Int) (|v_ULTIMATE.start_main_~pat~0#1.offset_BEFORE_CALL_4| Int)) (= (select (select |c_#memory_int| |v_ULTIMATE.start_main_~a~0#1.base_BEFORE_CALL_4|) 0) (select (select |c_#memory_int| |v_ULTIMATE.start_main_~pat~0#1.base_BEFORE_CALL_4|) (+ |v_ULTIMATE.start_main_~pat~0#1.offset_BEFORE_CALL_4| 4)))) is different from true [2021-12-16 20:35:17,419 INFO L354 Elim1Store]: treesize reduction 13, result has 7.1 percent of original size [2021-12-16 20:35:17,419 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 30 treesize of output 10 [2021-12-16 20:35:17,454 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 5 trivial. 2 not checked. [2021-12-16 20:35:17,455 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-16 20:35:17,677 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 5 proven. 5 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-12-16 20:35:17,677 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1725095429] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-16 20:35:17,677 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-16 20:35:17,677 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 13] total 39 [2021-12-16 20:35:17,677 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1672142664] [2021-12-16 20:35:17,677 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-16 20:35:17,678 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-12-16 20:35:17,678 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-16 20:35:17,678 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-12-16 20:35:17,678 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=207, Invalid=1131, Unknown=2, NotChecked=142, Total=1482 [2021-12-16 20:35:17,678 INFO L87 Difference]: Start difference. First operand 447 states and 570 transitions. Second operand has 39 states, 38 states have (on average 3.1842105263157894) internal successors, (121), 37 states have internal predecessors, (121), 7 states have call successors, (8), 5 states have call predecessors, (8), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-12-16 20:35:21,319 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-16 20:35:21,319 INFO L93 Difference]: Finished difference Result 803 states and 1043 transitions. [2021-12-16 20:35:21,320 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-12-16 20:35:21,320 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 38 states have (on average 3.1842105263157894) internal successors, (121), 37 states have internal predecessors, (121), 7 states have call successors, (8), 5 states have call predecessors, (8), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) Word has length 52 [2021-12-16 20:35:21,320 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-16 20:35:21,322 INFO L225 Difference]: With dead ends: 803 [2021-12-16 20:35:21,322 INFO L226 Difference]: Without dead ends: 647 [2021-12-16 20:35:21,323 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 129 GetRequests, 81 SyntacticMatches, 5 SemanticMatches, 43 ConstructedPredicates, 2 IntricatePredicates, 0 DeprecatedPredicates, 741 ImplicationChecksByTransitivity, 8.0s TimeCoverageRelationStatistics Valid=278, Invalid=1531, Unknown=5, NotChecked=166, Total=1980 [2021-12-16 20:35:21,324 INFO L933 BasicCegarLoop]: 95 mSDtfsCounter, 247 mSDsluCounter, 1085 mSDsCounter, 0 mSdLazyCounter, 833 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 257 SdHoareTripleChecker+Valid, 1180 SdHoareTripleChecker+Invalid, 1201 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 833 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 336 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-12-16 20:35:21,326 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [257 Valid, 1180 Invalid, 1201 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 833 Invalid, 0 Unknown, 336 Unchecked, 0.4s Time] [2021-12-16 20:35:21,327 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 647 states. [2021-12-16 20:35:21,413 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 647 to 468. [2021-12-16 20:35:21,414 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 468 states, 448 states have (on average 1.2611607142857142) internal successors, (565), 450 states have internal predecessors, (565), 13 states have call successors, (13), 6 states have call predecessors, (13), 6 states have return successors, (12), 11 states have call predecessors, (12), 12 states have call successors, (12) [2021-12-16 20:35:21,415 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 468 states to 468 states and 590 transitions. [2021-12-16 20:35:21,415 INFO L78 Accepts]: Start accepts. Automaton has 468 states and 590 transitions. Word has length 52 [2021-12-16 20:35:21,415 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-16 20:35:21,416 INFO L470 AbstractCegarLoop]: Abstraction has 468 states and 590 transitions. [2021-12-16 20:35:21,416 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 38 states have (on average 3.1842105263157894) internal successors, (121), 37 states have internal predecessors, (121), 7 states have call successors, (8), 5 states have call predecessors, (8), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-12-16 20:35:21,416 INFO L276 IsEmpty]: Start isEmpty. Operand 468 states and 590 transitions. [2021-12-16 20:35:21,417 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-12-16 20:35:21,417 INFO L506 BasicCegarLoop]: Found error trace [2021-12-16 20:35:21,417 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-16 20:35:21,439 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2021-12-16 20:35:21,633 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34,30 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-16 20:35:21,633 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-16 20:35:21,633 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-16 20:35:21,633 INFO L85 PathProgramCache]: Analyzing trace with hash -1251822086, now seen corresponding path program 6 times [2021-12-16 20:35:21,633 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-16 20:35:21,634 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [313324680] [2021-12-16 20:35:21,634 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 20:35:21,634 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-16 20:35:21,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:35:22,014 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 5 proven. 20 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-12-16 20:35:22,014 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-16 20:35:22,014 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [313324680] [2021-12-16 20:35:22,014 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [313324680] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-16 20:35:22,014 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1315070101] [2021-12-16 20:35:22,014 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-12-16 20:35:22,014 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-16 20:35:22,014 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-16 20:35:22,015 INFO L229 MonitoredProcess]: Starting monitored process 31 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-16 20:35:22,016 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2021-12-16 20:35:22,113 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 2 check-sat command(s) [2021-12-16 20:35:22,113 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-16 20:35:22,114 INFO L263 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 48 conjunts are in the unsatisfiable core [2021-12-16 20:35:22,115 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-16 20:35:22,531 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-16 20:35:22,532 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-16 20:35:22,532 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-16 20:35:22,535 INFO L354 Elim1Store]: treesize reduction 17, result has 15.0 percent of original size [2021-12-16 20:35:22,536 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 72 treesize of output 37 [2021-12-16 20:35:22,567 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 8 proven. 14 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-12-16 20:35:22,567 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-16 20:35:22,920 INFO L354 Elim1Store]: treesize reduction 30, result has 73.2 percent of original size [2021-12-16 20:35:22,920 INFO L388 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 39 treesize of output 89 [2021-12-16 20:35:23,329 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 2 proven. 20 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-12-16 20:35:23,329 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1315070101] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-16 20:35:23,329 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-16 20:35:23,329 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 11, 13] total 36 [2021-12-16 20:35:23,329 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1975404883] [2021-12-16 20:35:23,330 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-16 20:35:23,330 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-12-16 20:35:23,330 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-16 20:35:23,330 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-12-16 20:35:23,330 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=1158, Unknown=0, NotChecked=0, Total=1260 [2021-12-16 20:35:23,331 INFO L87 Difference]: Start difference. First operand 468 states and 590 transitions. Second operand has 36 states, 36 states have (on average 2.75) internal successors, (99), 35 states have internal predecessors, (99), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-16 20:35:27,834 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-16 20:35:27,834 INFO L93 Difference]: Finished difference Result 1564 states and 2022 transitions. [2021-12-16 20:35:27,835 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-12-16 20:35:27,835 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 2.75) internal successors, (99), 35 states have internal predecessors, (99), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 50 [2021-12-16 20:35:27,835 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-16 20:35:27,840 INFO L225 Difference]: With dead ends: 1564 [2021-12-16 20:35:27,840 INFO L226 Difference]: Without dead ends: 1283 [2021-12-16 20:35:27,841 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 81 SyntacticMatches, 0 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 845 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=508, Invalid=4048, Unknown=0, NotChecked=0, Total=4556 [2021-12-16 20:35:27,841 INFO L933 BasicCegarLoop]: 159 mSDtfsCounter, 772 mSDsluCounter, 3130 mSDsCounter, 0 mSdLazyCounter, 2785 mSolverCounterSat, 223 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 776 SdHoareTripleChecker+Valid, 3289 SdHoareTripleChecker+Invalid, 3008 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 223 IncrementalHoareTripleChecker+Valid, 2785 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-12-16 20:35:27,841 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [776 Valid, 3289 Invalid, 3008 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [223 Valid, 2785 Invalid, 0 Unknown, 0 Unchecked, 2.3s Time] [2021-12-16 20:35:27,842 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1283 states. [2021-12-16 20:35:27,956 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1283 to 522. [2021-12-16 20:35:27,956 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 522 states, 502 states have (on average 1.2669322709163346) internal successors, (636), 504 states have internal predecessors, (636), 13 states have call successors, (13), 6 states have call predecessors, (13), 6 states have return successors, (12), 11 states have call predecessors, (12), 12 states have call successors, (12) [2021-12-16 20:35:27,957 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 522 states to 522 states and 661 transitions. [2021-12-16 20:35:27,957 INFO L78 Accepts]: Start accepts. Automaton has 522 states and 661 transitions. Word has length 50 [2021-12-16 20:35:27,958 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-16 20:35:27,958 INFO L470 AbstractCegarLoop]: Abstraction has 522 states and 661 transitions. [2021-12-16 20:35:27,958 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 2.75) internal successors, (99), 35 states have internal predecessors, (99), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-16 20:35:27,958 INFO L276 IsEmpty]: Start isEmpty. Operand 522 states and 661 transitions. [2021-12-16 20:35:27,959 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-12-16 20:35:27,959 INFO L506 BasicCegarLoop]: Found error trace [2021-12-16 20:35:27,959 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-16 20:35:27,977 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2021-12-16 20:35:28,174 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2021-12-16 20:35:28,175 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-16 20:35:28,175 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-16 20:35:28,175 INFO L85 PathProgramCache]: Analyzing trace with hash -1768465341, now seen corresponding path program 1 times [2021-12-16 20:35:28,175 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-16 20:35:28,175 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [231128319] [2021-12-16 20:35:28,175 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 20:35:28,175 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-16 20:35:28,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:35:28,284 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 0 proven. 51 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-12-16 20:35:28,284 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-16 20:35:28,284 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [231128319] [2021-12-16 20:35:28,284 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [231128319] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-16 20:35:28,285 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2070618128] [2021-12-16 20:35:28,285 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 20:35:28,285 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-16 20:35:28,285 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-16 20:35:28,286 INFO L229 MonitoredProcess]: Starting monitored process 32 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-16 20:35:28,287 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2021-12-16 20:35:28,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:35:28,371 INFO L263 TraceCheckSpWp]: Trace formula consists of 236 conjuncts, 20 conjunts are in the unsatisfiable core [2021-12-16 20:35:28,372 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-16 20:35:28,578 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 28 proven. 17 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-12-16 20:35:28,579 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-16 20:35:28,765 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 28 proven. 9 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-12-16 20:35:28,765 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2070618128] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-16 20:35:28,765 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-16 20:35:28,765 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11, 9] total 27 [2021-12-16 20:35:28,765 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1402500520] [2021-12-16 20:35:28,765 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-16 20:35:28,765 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-12-16 20:35:28,766 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-16 20:35:28,766 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-12-16 20:35:28,766 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=636, Unknown=0, NotChecked=0, Total=702 [2021-12-16 20:35:28,766 INFO L87 Difference]: Start difference. First operand 522 states and 661 transitions. Second operand has 27 states, 26 states have (on average 3.5) internal successors, (91), 26 states have internal predecessors, (91), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-16 20:35:29,453 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-16 20:35:29,453 INFO L93 Difference]: Finished difference Result 710 states and 898 transitions. [2021-12-16 20:35:29,453 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-12-16 20:35:29,453 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 26 states have (on average 3.5) internal successors, (91), 26 states have internal predecessors, (91), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 51 [2021-12-16 20:35:29,453 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-16 20:35:29,455 INFO L225 Difference]: With dead ends: 710 [2021-12-16 20:35:29,455 INFO L226 Difference]: Without dead ends: 596 [2021-12-16 20:35:29,455 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 88 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=156, Invalid=1176, Unknown=0, NotChecked=0, Total=1332 [2021-12-16 20:35:29,456 INFO L933 BasicCegarLoop]: 74 mSDtfsCounter, 97 mSDsluCounter, 1358 mSDsCounter, 0 mSdLazyCounter, 948 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 97 SdHoareTripleChecker+Valid, 1432 SdHoareTripleChecker+Invalid, 983 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 948 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-12-16 20:35:29,456 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [97 Valid, 1432 Invalid, 983 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 948 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-12-16 20:35:29,456 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 596 states. [2021-12-16 20:35:29,553 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 596 to 522. [2021-12-16 20:35:29,554 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 522 states, 502 states have (on average 1.2649402390438247) internal successors, (635), 504 states have internal predecessors, (635), 13 states have call successors, (13), 6 states have call predecessors, (13), 6 states have return successors, (12), 11 states have call predecessors, (12), 12 states have call successors, (12) [2021-12-16 20:35:29,555 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 522 states to 522 states and 660 transitions. [2021-12-16 20:35:29,555 INFO L78 Accepts]: Start accepts. Automaton has 522 states and 660 transitions. Word has length 51 [2021-12-16 20:35:29,555 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-16 20:35:29,556 INFO L470 AbstractCegarLoop]: Abstraction has 522 states and 660 transitions. [2021-12-16 20:35:29,556 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 26 states have (on average 3.5) internal successors, (91), 26 states have internal predecessors, (91), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-16 20:35:29,556 INFO L276 IsEmpty]: Start isEmpty. Operand 522 states and 660 transitions. [2021-12-16 20:35:29,557 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-12-16 20:35:29,557 INFO L506 BasicCegarLoop]: Found error trace [2021-12-16 20:35:29,557 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-16 20:35:29,573 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Ended with exit code 0 [2021-12-16 20:35:29,764 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2021-12-16 20:35:29,764 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-16 20:35:29,764 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-16 20:35:29,764 INFO L85 PathProgramCache]: Analyzing trace with hash -1804342439, now seen corresponding path program 6 times [2021-12-16 20:35:29,765 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-16 20:35:29,765 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [892290379] [2021-12-16 20:35:29,765 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 20:35:29,765 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-16 20:35:29,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:35:30,220 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 5 proven. 34 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-12-16 20:35:30,220 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-16 20:35:30,221 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [892290379] [2021-12-16 20:35:30,221 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [892290379] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-16 20:35:30,221 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1878206708] [2021-12-16 20:35:30,221 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-12-16 20:35:30,221 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-16 20:35:30,221 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-16 20:35:30,222 INFO L229 MonitoredProcess]: Starting monitored process 33 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-16 20:35:30,224 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2021-12-16 20:35:30,416 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2021-12-16 20:35:30,416 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-16 20:35:30,418 INFO L263 TraceCheckSpWp]: Trace formula consists of 234 conjuncts, 64 conjunts are in the unsatisfiable core [2021-12-16 20:35:30,419 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-16 20:35:30,488 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-16 20:35:30,861 INFO L354 Elim1Store]: treesize reduction 7, result has 56.3 percent of original size [2021-12-16 20:35:30,861 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 20 [2021-12-16 20:35:30,884 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 5 proven. 40 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-12-16 20:35:30,884 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-16 20:35:31,252 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 10 proven. 14 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-12-16 20:35:31,252 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1878206708] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-16 20:35:31,252 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-16 20:35:31,252 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 20, 12] total 43 [2021-12-16 20:35:31,252 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1167160361] [2021-12-16 20:35:31,252 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-16 20:35:31,253 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2021-12-16 20:35:31,253 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-16 20:35:31,253 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-12-16 20:35:31,253 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=188, Invalid=1618, Unknown=0, NotChecked=0, Total=1806 [2021-12-16 20:35:31,254 INFO L87 Difference]: Start difference. First operand 522 states and 660 transitions. Second operand has 43 states, 43 states have (on average 2.558139534883721) internal successors, (110), 43 states have internal predecessors, (110), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-16 20:35:34,600 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-16 20:35:34,600 INFO L93 Difference]: Finished difference Result 1491 states and 1929 transitions. [2021-12-16 20:35:34,600 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2021-12-16 20:35:34,601 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 2.558139534883721) internal successors, (110), 43 states have internal predecessors, (110), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 51 [2021-12-16 20:35:34,601 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-16 20:35:34,604 INFO L225 Difference]: With dead ends: 1491 [2021-12-16 20:35:34,604 INFO L226 Difference]: Without dead ends: 1403 [2021-12-16 20:35:34,605 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 165 GetRequests, 78 SyntacticMatches, 0 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1877 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=802, Invalid=7030, Unknown=0, NotChecked=0, Total=7832 [2021-12-16 20:35:34,605 INFO L933 BasicCegarLoop]: 182 mSDtfsCounter, 1434 mSDsluCounter, 2804 mSDsCounter, 0 mSdLazyCounter, 2940 mSolverCounterSat, 450 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1442 SdHoareTripleChecker+Valid, 2986 SdHoareTripleChecker+Invalid, 3390 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 450 IncrementalHoareTripleChecker+Valid, 2940 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2021-12-16 20:35:34,605 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1442 Valid, 2986 Invalid, 3390 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [450 Valid, 2940 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2021-12-16 20:35:34,606 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1403 states. [2021-12-16 20:35:34,724 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1403 to 567. [2021-12-16 20:35:34,725 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 567 states, 547 states have (on average 1.263254113345521) internal successors, (691), 549 states have internal predecessors, (691), 13 states have call successors, (13), 6 states have call predecessors, (13), 6 states have return successors, (12), 11 states have call predecessors, (12), 12 states have call successors, (12) [2021-12-16 20:35:34,726 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 567 states to 567 states and 716 transitions. [2021-12-16 20:35:34,726 INFO L78 Accepts]: Start accepts. Automaton has 567 states and 716 transitions. Word has length 51 [2021-12-16 20:35:34,726 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-16 20:35:34,726 INFO L470 AbstractCegarLoop]: Abstraction has 567 states and 716 transitions. [2021-12-16 20:35:34,726 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 2.558139534883721) internal successors, (110), 43 states have internal predecessors, (110), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-16 20:35:34,726 INFO L276 IsEmpty]: Start isEmpty. Operand 567 states and 716 transitions. [2021-12-16 20:35:34,727 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-12-16 20:35:34,727 INFO L506 BasicCegarLoop]: Found error trace [2021-12-16 20:35:34,727 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-16 20:35:34,733 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Forceful destruction successful, exit code 0 [2021-12-16 20:35:34,931 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2021-12-16 20:35:34,932 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-16 20:35:34,932 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-16 20:35:34,932 INFO L85 PathProgramCache]: Analyzing trace with hash 1341258368, now seen corresponding path program 7 times [2021-12-16 20:35:34,932 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-16 20:35:34,932 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1370816312] [2021-12-16 20:35:34,932 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 20:35:34,932 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-16 20:35:34,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:35:35,500 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 8 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-16 20:35:35,500 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-16 20:35:35,500 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1370816312] [2021-12-16 20:35:35,500 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1370816312] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-16 20:35:35,500 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [559479047] [2021-12-16 20:35:35,500 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-12-16 20:35:35,501 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-16 20:35:35,501 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-16 20:35:35,501 INFO L229 MonitoredProcess]: Starting monitored process 34 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-16 20:35:35,502 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2021-12-16 20:35:35,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:35:35,768 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 22 conjunts are in the unsatisfiable core [2021-12-16 20:35:35,769 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-16 20:35:36,082 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 4 proven. 21 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-12-16 20:35:36,082 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-16 20:35:36,412 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 4 proven. 21 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-12-16 20:35:36,413 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [559479047] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-16 20:35:36,413 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-16 20:35:36,413 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 12, 12] total 43 [2021-12-16 20:35:36,413 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [944669513] [2021-12-16 20:35:36,413 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-16 20:35:36,413 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2021-12-16 20:35:36,413 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-16 20:35:36,414 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-12-16 20:35:36,414 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=1672, Unknown=0, NotChecked=0, Total=1806 [2021-12-16 20:35:36,414 INFO L87 Difference]: Start difference. First operand 567 states and 716 transitions. Second operand has 43 states, 43 states have (on average 2.4651162790697674) internal successors, (106), 43 states have internal predecessors, (106), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-16 20:36:26,444 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-16 20:36:26,444 INFO L93 Difference]: Finished difference Result 4270 states and 5521 transitions. [2021-12-16 20:36:26,445 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 203 states. [2021-12-16 20:36:26,445 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 2.4651162790697674) internal successors, (106), 43 states have internal predecessors, (106), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 52 [2021-12-16 20:36:26,445 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-16 20:36:26,458 INFO L225 Difference]: With dead ends: 4270 [2021-12-16 20:36:26,459 INFO L226 Difference]: Without dead ends: 4104 [2021-12-16 20:36:26,462 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 327 GetRequests, 88 SyntacticMatches, 0 SemanticMatches, 239 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20928 ImplicationChecksByTransitivity, 45.0s TimeCoverageRelationStatistics Valid=6091, Invalid=51747, Unknown=2, NotChecked=0, Total=57840 [2021-12-16 20:36:26,463 INFO L933 BasicCegarLoop]: 396 mSDtfsCounter, 6004 mSDsluCounter, 6744 mSDsCounter, 0 mSdLazyCounter, 5658 mSolverCounterSat, 1671 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6004 SdHoareTripleChecker+Valid, 7140 SdHoareTripleChecker+Invalid, 7329 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1671 IncrementalHoareTripleChecker+Valid, 5658 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.3s IncrementalHoareTripleChecker+Time [2021-12-16 20:36:26,463 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6004 Valid, 7140 Invalid, 7329 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1671 Valid, 5658 Invalid, 0 Unknown, 0 Unchecked, 4.3s Time] [2021-12-16 20:36:26,465 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4104 states. [2021-12-16 20:36:26,619 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4104 to 487. [2021-12-16 20:36:26,620 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 487 states, 467 states have (on average 1.2526766595289078) internal successors, (585), 469 states have internal predecessors, (585), 13 states have call successors, (13), 6 states have call predecessors, (13), 6 states have return successors, (12), 11 states have call predecessors, (12), 12 states have call successors, (12) [2021-12-16 20:36:26,621 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 487 states to 487 states and 610 transitions. [2021-12-16 20:36:26,621 INFO L78 Accepts]: Start accepts. Automaton has 487 states and 610 transitions. Word has length 52 [2021-12-16 20:36:26,621 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-16 20:36:26,621 INFO L470 AbstractCegarLoop]: Abstraction has 487 states and 610 transitions. [2021-12-16 20:36:26,621 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 2.4651162790697674) internal successors, (106), 43 states have internal predecessors, (106), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-16 20:36:26,621 INFO L276 IsEmpty]: Start isEmpty. Operand 487 states and 610 transitions. [2021-12-16 20:36:26,622 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-12-16 20:36:26,622 INFO L506 BasicCegarLoop]: Found error trace [2021-12-16 20:36:26,622 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-16 20:36:26,641 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Forceful destruction successful, exit code 0 [2021-12-16 20:36:26,835 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2021-12-16 20:36:26,835 INFO L402 AbstractCegarLoop]: === Iteration 40 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-16 20:36:26,836 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-16 20:36:26,836 INFO L85 PathProgramCache]: Analyzing trace with hash 161123635, now seen corresponding path program 2 times [2021-12-16 20:36:26,836 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-16 20:36:26,836 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [524242920] [2021-12-16 20:36:26,836 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 20:36:26,836 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-16 20:36:26,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:36:26,943 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2021-12-16 20:36:26,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:36:26,947 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 35 [2021-12-16 20:36:26,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:36:26,960 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 44 [2021-12-16 20:36:26,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:36:26,963 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 2 proven. 13 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-12-16 20:36:26,964 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-16 20:36:26,964 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [524242920] [2021-12-16 20:36:26,964 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [524242920] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-16 20:36:26,964 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [995082232] [2021-12-16 20:36:26,964 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-16 20:36:26,964 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-16 20:36:26,964 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-16 20:36:26,965 INFO L229 MonitoredProcess]: Starting monitored process 35 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-16 20:36:26,966 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2021-12-16 20:36:27,047 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-16 20:36:27,047 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-16 20:36:27,048 INFO L263 TraceCheckSpWp]: Trace formula consists of 213 conjuncts, 14 conjunts are in the unsatisfiable core [2021-12-16 20:36:27,049 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-16 20:36:27,237 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 4 proven. 11 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-12-16 20:36:27,237 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-16 20:36:27,429 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 4 proven. 11 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-12-16 20:36:27,430 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [995082232] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-16 20:36:27,430 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-16 20:36:27,430 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 9, 9] total 19 [2021-12-16 20:36:27,430 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1265221286] [2021-12-16 20:36:27,430 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-16 20:36:27,430 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-12-16 20:36:27,430 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-16 20:36:27,430 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-12-16 20:36:27,431 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=286, Unknown=0, NotChecked=0, Total=342 [2021-12-16 20:36:27,431 INFO L87 Difference]: Start difference. First operand 487 states and 610 transitions. Second operand has 19 states, 19 states have (on average 3.6315789473684212) internal successors, (69), 19 states have internal predecessors, (69), 8 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-12-16 20:36:27,829 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-16 20:36:27,829 INFO L93 Difference]: Finished difference Result 592 states and 741 transitions. [2021-12-16 20:36:27,830 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-12-16 20:36:27,830 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 3.6315789473684212) internal successors, (69), 19 states have internal predecessors, (69), 8 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) Word has length 59 [2021-12-16 20:36:27,830 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-16 20:36:27,831 INFO L225 Difference]: With dead ends: 592 [2021-12-16 20:36:27,831 INFO L226 Difference]: Without dead ends: 515 [2021-12-16 20:36:27,832 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 113 SyntacticMatches, 4 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 73 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=92, Invalid=414, Unknown=0, NotChecked=0, Total=506 [2021-12-16 20:36:27,832 INFO L933 BasicCegarLoop]: 56 mSDtfsCounter, 127 mSDsluCounter, 545 mSDsCounter, 0 mSdLazyCounter, 342 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 127 SdHoareTripleChecker+Valid, 601 SdHoareTripleChecker+Invalid, 374 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 342 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-16 20:36:27,832 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [127 Valid, 601 Invalid, 374 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 342 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-16 20:36:27,832 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 515 states. [2021-12-16 20:36:27,965 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 515 to 477. [2021-12-16 20:36:27,966 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 477 states, 457 states have (on average 1.24945295404814) internal successors, (571), 459 states have internal predecessors, (571), 13 states have call successors, (13), 6 states have call predecessors, (13), 6 states have return successors, (12), 11 states have call predecessors, (12), 12 states have call successors, (12) [2021-12-16 20:36:27,967 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 477 states to 477 states and 596 transitions. [2021-12-16 20:36:27,967 INFO L78 Accepts]: Start accepts. Automaton has 477 states and 596 transitions. Word has length 59 [2021-12-16 20:36:27,967 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-16 20:36:27,967 INFO L470 AbstractCegarLoop]: Abstraction has 477 states and 596 transitions. [2021-12-16 20:36:27,967 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 3.6315789473684212) internal successors, (69), 19 states have internal predecessors, (69), 8 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-12-16 20:36:27,967 INFO L276 IsEmpty]: Start isEmpty. Operand 477 states and 596 transitions. [2021-12-16 20:36:27,968 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-12-16 20:36:27,968 INFO L506 BasicCegarLoop]: Found error trace [2021-12-16 20:36:27,968 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-16 20:36:28,030 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Forceful destruction successful, exit code 0 [2021-12-16 20:36:28,179 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2021-12-16 20:36:28,179 INFO L402 AbstractCegarLoop]: === Iteration 41 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-16 20:36:28,180 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-16 20:36:28,180 INFO L85 PathProgramCache]: Analyzing trace with hash 1471487909, now seen corresponding path program 2 times [2021-12-16 20:36:28,180 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-16 20:36:28,180 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [746997031] [2021-12-16 20:36:28,180 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 20:36:28,180 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-16 20:36:28,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:36:28,306 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-12-16 20:36:28,306 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-16 20:36:28,306 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [746997031] [2021-12-16 20:36:28,306 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [746997031] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-16 20:36:28,306 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2019781276] [2021-12-16 20:36:28,306 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-16 20:36:28,307 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-16 20:36:28,307 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-16 20:36:28,308 INFO L229 MonitoredProcess]: Starting monitored process 36 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-16 20:36:28,309 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2021-12-16 20:36:28,413 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-16 20:36:28,413 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-16 20:36:28,415 INFO L263 TraceCheckSpWp]: Trace formula consists of 256 conjuncts, 14 conjunts are in the unsatisfiable core [2021-12-16 20:36:28,416 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-16 20:36:28,595 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 42 proven. 9 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-12-16 20:36:28,595 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-16 20:36:28,780 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 42 proven. 9 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-12-16 20:36:28,780 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2019781276] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-16 20:36:28,780 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-16 20:36:28,780 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 9, 9] total 26 [2021-12-16 20:36:28,781 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1720824145] [2021-12-16 20:36:28,781 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-16 20:36:28,781 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-12-16 20:36:28,781 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-16 20:36:28,781 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-12-16 20:36:28,781 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=586, Unknown=0, NotChecked=0, Total=650 [2021-12-16 20:36:28,782 INFO L87 Difference]: Start difference. First operand 477 states and 596 transitions. Second operand has 26 states, 26 states have (on average 3.6923076923076925) internal successors, (96), 25 states have internal predecessors, (96), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-16 20:36:29,412 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-16 20:36:29,412 INFO L93 Difference]: Finished difference Result 556 states and 696 transitions. [2021-12-16 20:36:29,412 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-12-16 20:36:29,412 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 3.6923076923076925) internal successors, (96), 25 states have internal predecessors, (96), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 57 [2021-12-16 20:36:29,413 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-16 20:36:29,414 INFO L225 Difference]: With dead ends: 556 [2021-12-16 20:36:29,414 INFO L226 Difference]: Without dead ends: 480 [2021-12-16 20:36:29,414 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 101 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=154, Invalid=1106, Unknown=0, NotChecked=0, Total=1260 [2021-12-16 20:36:29,414 INFO L933 BasicCegarLoop]: 77 mSDtfsCounter, 73 mSDsluCounter, 1445 mSDsCounter, 0 mSdLazyCounter, 854 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 73 SdHoareTripleChecker+Valid, 1522 SdHoareTripleChecker+Invalid, 889 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 854 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-12-16 20:36:29,415 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [73 Valid, 1522 Invalid, 889 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 854 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-12-16 20:36:29,415 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 480 states. [2021-12-16 20:36:29,532 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 480 to 470. [2021-12-16 20:36:29,533 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 470 states, 450 states have (on average 1.2555555555555555) internal successors, (565), 452 states have internal predecessors, (565), 13 states have call successors, (13), 6 states have call predecessors, (13), 6 states have return successors, (12), 11 states have call predecessors, (12), 12 states have call successors, (12) [2021-12-16 20:36:29,534 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 470 states to 470 states and 590 transitions. [2021-12-16 20:36:29,534 INFO L78 Accepts]: Start accepts. Automaton has 470 states and 590 transitions. Word has length 57 [2021-12-16 20:36:29,534 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-16 20:36:29,534 INFO L470 AbstractCegarLoop]: Abstraction has 470 states and 590 transitions. [2021-12-16 20:36:29,534 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 3.6923076923076925) internal successors, (96), 25 states have internal predecessors, (96), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-16 20:36:29,534 INFO L276 IsEmpty]: Start isEmpty. Operand 470 states and 590 transitions. [2021-12-16 20:36:29,535 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-12-16 20:36:29,535 INFO L506 BasicCegarLoop]: Found error trace [2021-12-16 20:36:29,535 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-16 20:36:29,553 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Forceful destruction successful, exit code 0 [2021-12-16 20:36:29,735 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,36 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-16 20:36:29,735 INFO L402 AbstractCegarLoop]: === Iteration 42 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-16 20:36:29,736 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-16 20:36:29,736 INFO L85 PathProgramCache]: Analyzing trace with hash 289116221, now seen corresponding path program 8 times [2021-12-16 20:36:29,736 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-16 20:36:29,736 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1980821794] [2021-12-16 20:36:29,736 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 20:36:29,736 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-16 20:36:29,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:36:30,275 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 7 proven. 47 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-12-16 20:36:30,275 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-16 20:36:30,275 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1980821794] [2021-12-16 20:36:30,275 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1980821794] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-16 20:36:30,275 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [394636889] [2021-12-16 20:36:30,276 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-16 20:36:30,276 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-16 20:36:30,276 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-16 20:36:30,277 INFO L229 MonitoredProcess]: Starting monitored process 37 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-16 20:36:30,278 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2021-12-16 20:36:30,516 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-16 20:36:30,517 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-16 20:36:30,519 INFO L263 TraceCheckSpWp]: Trace formula consists of 256 conjuncts, 76 conjunts are in the unsatisfiable core [2021-12-16 20:36:30,520 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-16 20:36:30,723 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-16 20:36:31,409 INFO L354 Elim1Store]: treesize reduction 3, result has 78.6 percent of original size [2021-12-16 20:36:31,409 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 31 treesize of output 22 [2021-12-16 20:36:31,441 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 7 proven. 61 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-12-16 20:36:31,441 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-16 20:36:32,370 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 8 proven. 30 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-12-16 20:36:32,370 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [394636889] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-16 20:36:32,370 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-16 20:36:32,370 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 24, 17] total 59 [2021-12-16 20:36:32,371 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [336457294] [2021-12-16 20:36:32,371 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-16 20:36:32,371 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 59 states [2021-12-16 20:36:32,371 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-16 20:36:32,371 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2021-12-16 20:36:32,372 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=322, Invalid=3100, Unknown=0, NotChecked=0, Total=3422 [2021-12-16 20:36:32,372 INFO L87 Difference]: Start difference. First operand 470 states and 590 transitions. Second operand has 59 states, 59 states have (on average 2.3559322033898304) internal successors, (139), 59 states have internal predecessors, (139), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-16 20:36:37,031 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-16 20:36:37,032 INFO L93 Difference]: Finished difference Result 1212 states and 1566 transitions. [2021-12-16 20:36:37,032 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2021-12-16 20:36:37,032 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 59 states have (on average 2.3559322033898304) internal successors, (139), 59 states have internal predecessors, (139), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 57 [2021-12-16 20:36:37,033 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-16 20:36:37,035 INFO L225 Difference]: With dead ends: 1212 [2021-12-16 20:36:37,035 INFO L226 Difference]: Without dead ends: 1089 [2021-12-16 20:36:37,036 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 180 GetRequests, 78 SyntacticMatches, 0 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2647 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=1240, Invalid=9472, Unknown=0, NotChecked=0, Total=10712 [2021-12-16 20:36:37,036 INFO L933 BasicCegarLoop]: 136 mSDtfsCounter, 1925 mSDsluCounter, 2638 mSDsCounter, 0 mSdLazyCounter, 3823 mSolverCounterSat, 527 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1925 SdHoareTripleChecker+Valid, 2774 SdHoareTripleChecker+Invalid, 4350 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 527 IncrementalHoareTripleChecker+Valid, 3823 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2021-12-16 20:36:37,037 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1925 Valid, 2774 Invalid, 4350 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [527 Valid, 3823 Invalid, 0 Unknown, 0 Unchecked, 2.2s Time] [2021-12-16 20:36:37,037 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1089 states. [2021-12-16 20:36:37,151 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1089 to 480. [2021-12-16 20:36:37,152 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 480 states, 460 states have (on average 1.2543478260869565) internal successors, (577), 462 states have internal predecessors, (577), 13 states have call successors, (13), 6 states have call predecessors, (13), 6 states have return successors, (12), 11 states have call predecessors, (12), 12 states have call successors, (12) [2021-12-16 20:36:37,153 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 480 states to 480 states and 602 transitions. [2021-12-16 20:36:37,153 INFO L78 Accepts]: Start accepts. Automaton has 480 states and 602 transitions. Word has length 57 [2021-12-16 20:36:37,153 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-16 20:36:37,153 INFO L470 AbstractCegarLoop]: Abstraction has 480 states and 602 transitions. [2021-12-16 20:36:37,153 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 59 states, 59 states have (on average 2.3559322033898304) internal successors, (139), 59 states have internal predecessors, (139), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-16 20:36:37,153 INFO L276 IsEmpty]: Start isEmpty. Operand 480 states and 602 transitions. [2021-12-16 20:36:37,154 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-12-16 20:36:37,154 INFO L506 BasicCegarLoop]: Found error trace [2021-12-16 20:36:37,154 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-16 20:36:37,171 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Ended with exit code 0 [2021-12-16 20:36:37,371 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41,37 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-16 20:36:37,371 INFO L402 AbstractCegarLoop]: === Iteration 43 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-16 20:36:37,371 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-16 20:36:37,371 INFO L85 PathProgramCache]: Analyzing trace with hash -392326355, now seen corresponding path program 9 times [2021-12-16 20:36:37,371 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-16 20:36:37,372 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [931460163] [2021-12-16 20:36:37,372 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 20:36:37,372 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-16 20:36:37,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:36:38,662 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 0 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-16 20:36:38,662 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-16 20:36:38,662 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [931460163] [2021-12-16 20:36:38,663 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [931460163] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-16 20:36:38,663 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1546111633] [2021-12-16 20:36:38,663 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-16 20:36:38,663 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-16 20:36:38,663 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-16 20:36:38,664 INFO L229 MonitoredProcess]: Starting monitored process 38 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-16 20:36:38,664 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2021-12-16 20:36:40,803 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-12-16 20:36:40,803 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-16 20:36:40,808 INFO L263 TraceCheckSpWp]: Trace formula consists of 256 conjuncts, 86 conjunts are in the unsatisfiable core [2021-12-16 20:36:40,810 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-16 20:36:40,815 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-12-16 20:36:40,930 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-12-16 20:36:41,004 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-16 20:36:41,037 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-16 20:36:41,074 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-16 20:36:41,082 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-16 20:36:41,841 INFO L354 Elim1Store]: treesize reduction 68, result has 4.2 percent of original size [2021-12-16 20:36:41,841 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 82 treesize of output 38 [2021-12-16 20:36:41,886 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 7 proven. 62 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-16 20:36:41,886 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-16 20:36:43,143 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 5 proven. 33 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-12-16 20:36:43,143 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1546111633] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-16 20:36:43,143 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-16 20:36:43,143 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 24, 20] total 71 [2021-12-16 20:36:43,143 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1008362361] [2021-12-16 20:36:43,143 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-16 20:36:43,144 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 71 states [2021-12-16 20:36:43,144 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-16 20:36:43,145 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2021-12-16 20:36:43,145 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=351, Invalid=4619, Unknown=0, NotChecked=0, Total=4970 [2021-12-16 20:36:43,145 INFO L87 Difference]: Start difference. First operand 480 states and 602 transitions. Second operand has 71 states, 71 states have (on average 2.112676056338028) internal successors, (150), 70 states have internal predecessors, (150), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-16 20:36:54,956 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-16 20:36:54,956 INFO L93 Difference]: Finished difference Result 1720 states and 2231 transitions. [2021-12-16 20:36:54,957 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 82 states. [2021-12-16 20:36:54,957 INFO L78 Accepts]: Start accepts. Automaton has has 71 states, 71 states have (on average 2.112676056338028) internal successors, (150), 70 states have internal predecessors, (150), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 57 [2021-12-16 20:36:54,957 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-16 20:36:54,961 INFO L225 Difference]: With dead ends: 1720 [2021-12-16 20:36:54,961 INFO L226 Difference]: Without dead ends: 1600 [2021-12-16 20:36:54,963 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 225 GetRequests, 74 SyntacticMatches, 2 SemanticMatches, 149 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5608 ImplicationChecksByTransitivity, 8.3s TimeCoverageRelationStatistics Valid=1766, Invalid=20884, Unknown=0, NotChecked=0, Total=22650 [2021-12-16 20:36:54,963 INFO L933 BasicCegarLoop]: 276 mSDtfsCounter, 2134 mSDsluCounter, 7234 mSDsCounter, 0 mSdLazyCounter, 8531 mSolverCounterSat, 616 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2134 SdHoareTripleChecker+Valid, 7510 SdHoareTripleChecker+Invalid, 9147 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 616 IncrementalHoareTripleChecker+Valid, 8531 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.1s IncrementalHoareTripleChecker+Time [2021-12-16 20:36:54,963 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2134 Valid, 7510 Invalid, 9147 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [616 Valid, 8531 Invalid, 0 Unknown, 0 Unchecked, 5.1s Time] [2021-12-16 20:36:54,964 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1600 states. [2021-12-16 20:36:55,088 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1600 to 492. [2021-12-16 20:36:55,089 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 492 states, 472 states have (on average 1.2521186440677967) internal successors, (591), 474 states have internal predecessors, (591), 13 states have call successors, (13), 6 states have call predecessors, (13), 6 states have return successors, (12), 11 states have call predecessors, (12), 12 states have call successors, (12) [2021-12-16 20:36:55,090 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 492 states to 492 states and 616 transitions. [2021-12-16 20:36:55,090 INFO L78 Accepts]: Start accepts. Automaton has 492 states and 616 transitions. Word has length 57 [2021-12-16 20:36:55,090 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-16 20:36:55,090 INFO L470 AbstractCegarLoop]: Abstraction has 492 states and 616 transitions. [2021-12-16 20:36:55,090 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 71 states, 71 states have (on average 2.112676056338028) internal successors, (150), 70 states have internal predecessors, (150), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-16 20:36:55,090 INFO L276 IsEmpty]: Start isEmpty. Operand 492 states and 616 transitions. [2021-12-16 20:36:55,091 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-12-16 20:36:55,091 INFO L506 BasicCegarLoop]: Found error trace [2021-12-16 20:36:55,091 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-16 20:36:55,098 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Forceful destruction successful, exit code 0 [2021-12-16 20:36:55,297 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42,38 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-16 20:36:55,298 INFO L402 AbstractCegarLoop]: === Iteration 44 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-16 20:36:55,298 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-16 20:36:55,298 INFO L85 PathProgramCache]: Analyzing trace with hash 1062300221, now seen corresponding path program 10 times [2021-12-16 20:36:55,298 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-16 20:36:55,298 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1043137686] [2021-12-16 20:36:55,298 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 20:36:55,298 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-16 20:36:55,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:36:55,864 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 7 proven. 47 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-12-16 20:36:55,864 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-16 20:36:55,864 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1043137686] [2021-12-16 20:36:55,864 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1043137686] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-16 20:36:55,864 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1510493191] [2021-12-16 20:36:55,864 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-16 20:36:55,864 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-16 20:36:55,864 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-16 20:36:55,865 INFO L229 MonitoredProcess]: Starting monitored process 39 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-16 20:36:55,866 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2021-12-16 20:36:55,998 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-16 20:36:55,998 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-16 20:36:56,000 INFO L263 TraceCheckSpWp]: Trace formula consists of 256 conjuncts, 65 conjunts are in the unsatisfiable core [2021-12-16 20:36:56,001 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-16 20:36:56,100 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-16 20:36:56,563 INFO L354 Elim1Store]: treesize reduction 5, result has 68.8 percent of original size [2021-12-16 20:36:56,563 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 22 [2021-12-16 20:36:56,572 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 7 proven. 58 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-12-16 20:36:56,572 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-16 20:36:57,115 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 8 proven. 30 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-12-16 20:36:57,115 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1510493191] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-16 20:36:57,115 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-16 20:36:57,115 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21, 16] total 52 [2021-12-16 20:36:57,116 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1088258798] [2021-12-16 20:36:57,116 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-16 20:36:57,116 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2021-12-16 20:36:57,116 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-16 20:36:57,117 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-12-16 20:36:57,117 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=267, Invalid=2385, Unknown=0, NotChecked=0, Total=2652 [2021-12-16 20:36:57,117 INFO L87 Difference]: Start difference. First operand 492 states and 616 transitions. Second operand has 52 states, 52 states have (on average 2.3653846153846154) internal successors, (123), 52 states have internal predecessors, (123), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-16 20:36:59,208 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-16 20:36:59,208 INFO L93 Difference]: Finished difference Result 998 states and 1296 transitions. [2021-12-16 20:36:59,209 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-12-16 20:36:59,209 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 2.3653846153846154) internal successors, (123), 52 states have internal predecessors, (123), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 57 [2021-12-16 20:36:59,209 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-16 20:36:59,211 INFO L225 Difference]: With dead ends: 998 [2021-12-16 20:36:59,211 INFO L226 Difference]: Without dead ends: 961 [2021-12-16 20:36:59,212 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 85 SyntacticMatches, 1 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1362 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=510, Invalid=4320, Unknown=0, NotChecked=0, Total=4830 [2021-12-16 20:36:59,212 INFO L933 BasicCegarLoop]: 137 mSDtfsCounter, 460 mSDsluCounter, 2562 mSDsCounter, 0 mSdLazyCounter, 2175 mSolverCounterSat, 73 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 472 SdHoareTripleChecker+Valid, 2699 SdHoareTripleChecker+Invalid, 2248 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 73 IncrementalHoareTripleChecker+Valid, 2175 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-12-16 20:36:59,212 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [472 Valid, 2699 Invalid, 2248 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [73 Valid, 2175 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2021-12-16 20:36:59,213 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 961 states. [2021-12-16 20:36:59,343 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 961 to 504. [2021-12-16 20:36:59,344 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 504 states, 484 states have (on average 1.2541322314049588) internal successors, (607), 486 states have internal predecessors, (607), 13 states have call successors, (13), 6 states have call predecessors, (13), 6 states have return successors, (12), 11 states have call predecessors, (12), 12 states have call successors, (12) [2021-12-16 20:36:59,344 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 504 states to 504 states and 632 transitions. [2021-12-16 20:36:59,345 INFO L78 Accepts]: Start accepts. Automaton has 504 states and 632 transitions. Word has length 57 [2021-12-16 20:36:59,345 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-16 20:36:59,345 INFO L470 AbstractCegarLoop]: Abstraction has 504 states and 632 transitions. [2021-12-16 20:36:59,345 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 52 states have (on average 2.3653846153846154) internal successors, (123), 52 states have internal predecessors, (123), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-16 20:36:59,345 INFO L276 IsEmpty]: Start isEmpty. Operand 504 states and 632 transitions. [2021-12-16 20:36:59,346 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-12-16 20:36:59,346 INFO L506 BasicCegarLoop]: Found error trace [2021-12-16 20:36:59,346 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-16 20:36:59,365 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Forceful destruction successful, exit code 0 [2021-12-16 20:36:59,559 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable43 [2021-12-16 20:36:59,559 INFO L402 AbstractCegarLoop]: === Iteration 45 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-16 20:36:59,560 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-16 20:36:59,560 INFO L85 PathProgramCache]: Analyzing trace with hash -359161805, now seen corresponding path program 1 times [2021-12-16 20:36:59,560 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-16 20:36:59,560 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1545751273] [2021-12-16 20:36:59,560 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 20:36:59,560 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-16 20:36:59,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:36:59,645 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2021-12-16 20:36:59,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:36:59,648 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2021-12-16 20:36:59,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:36:59,651 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 46 [2021-12-16 20:36:59,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:36:59,654 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-12-16 20:36:59,654 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-16 20:36:59,654 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1545751273] [2021-12-16 20:36:59,655 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1545751273] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-16 20:36:59,655 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [362049438] [2021-12-16 20:36:59,655 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 20:36:59,655 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-16 20:36:59,655 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-16 20:36:59,656 INFO L229 MonitoredProcess]: Starting monitored process 40 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-16 20:36:59,658 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2021-12-16 20:36:59,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:36:59,748 INFO L263 TraceCheckSpWp]: Trace formula consists of 224 conjuncts, 20 conjunts are in the unsatisfiable core [2021-12-16 20:36:59,749 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-16 20:36:59,919 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 4 proven. 19 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-12-16 20:36:59,919 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-16 20:37:00,083 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 4 proven. 11 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-12-16 20:37:00,083 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [362049438] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-16 20:37:00,083 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-16 20:37:00,083 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 11, 9] total 21 [2021-12-16 20:37:00,083 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1365464360] [2021-12-16 20:37:00,083 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-16 20:37:00,084 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-12-16 20:37:00,084 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-16 20:37:00,084 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-12-16 20:37:00,084 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=364, Unknown=0, NotChecked=0, Total=420 [2021-12-16 20:37:00,084 INFO L87 Difference]: Start difference. First operand 504 states and 632 transitions. Second operand has 21 states, 21 states have (on average 4.333333333333333) internal successors, (91), 21 states have internal predecessors, (91), 9 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-12-16 20:37:00,628 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-16 20:37:00,628 INFO L93 Difference]: Finished difference Result 576 states and 718 transitions. [2021-12-16 20:37:00,629 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-12-16 20:37:00,629 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 4.333333333333333) internal successors, (91), 21 states have internal predecessors, (91), 9 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) Word has length 61 [2021-12-16 20:37:00,629 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-16 20:37:00,636 INFO L225 Difference]: With dead ends: 576 [2021-12-16 20:37:00,636 INFO L226 Difference]: Without dead ends: 478 [2021-12-16 20:37:00,637 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 115 SyntacticMatches, 2 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 87 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=157, Invalid=773, Unknown=0, NotChecked=0, Total=930 [2021-12-16 20:37:00,637 INFO L933 BasicCegarLoop]: 59 mSDtfsCounter, 53 mSDsluCounter, 748 mSDsCounter, 0 mSdLazyCounter, 414 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 807 SdHoareTripleChecker+Invalid, 442 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 414 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-16 20:37:00,637 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [54 Valid, 807 Invalid, 442 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 414 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-16 20:37:00,638 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 478 states. [2021-12-16 20:37:00,749 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 478 to 463. [2021-12-16 20:37:00,750 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 463 states, 447 states have (on average 1.261744966442953) internal successors, (564), 449 states have internal predecessors, (564), 9 states have call successors, (9), 6 states have call predecessors, (9), 6 states have return successors, (8), 7 states have call predecessors, (8), 8 states have call successors, (8) [2021-12-16 20:37:00,750 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 463 states to 463 states and 581 transitions. [2021-12-16 20:37:00,750 INFO L78 Accepts]: Start accepts. Automaton has 463 states and 581 transitions. Word has length 61 [2021-12-16 20:37:00,750 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-16 20:37:00,751 INFO L470 AbstractCegarLoop]: Abstraction has 463 states and 581 transitions. [2021-12-16 20:37:00,751 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 4.333333333333333) internal successors, (91), 21 states have internal predecessors, (91), 9 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-12-16 20:37:00,751 INFO L276 IsEmpty]: Start isEmpty. Operand 463 states and 581 transitions. [2021-12-16 20:37:00,751 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-12-16 20:37:00,751 INFO L506 BasicCegarLoop]: Found error trace [2021-12-16 20:37:00,752 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-16 20:37:00,767 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Ended with exit code 0 [2021-12-16 20:37:00,952 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable44 [2021-12-16 20:37:00,952 INFO L402 AbstractCegarLoop]: === Iteration 46 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-16 20:37:00,952 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-16 20:37:00,952 INFO L85 PathProgramCache]: Analyzing trace with hash -1331257673, now seen corresponding path program 7 times [2021-12-16 20:37:00,953 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-16 20:37:00,953 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [611786148] [2021-12-16 20:37:00,953 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 20:37:00,953 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-16 20:37:00,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:37:01,111 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2021-12-16 20:37:01,112 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-16 20:37:01,112 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [611786148] [2021-12-16 20:37:01,112 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [611786148] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-16 20:37:01,112 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1436370388] [2021-12-16 20:37:01,112 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-12-16 20:37:01,112 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-16 20:37:01,112 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-16 20:37:01,113 INFO L229 MonitoredProcess]: Starting monitored process 41 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-16 20:37:01,115 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2021-12-16 20:37:01,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:37:01,287 INFO L263 TraceCheckSpWp]: Trace formula consists of 263 conjuncts, 75 conjunts are in the unsatisfiable core [2021-12-16 20:37:01,289 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-16 20:37:01,293 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-12-16 20:37:01,361 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-12-16 20:37:01,398 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-16 20:37:01,423 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-16 20:37:01,447 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-16 20:37:01,459 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-16 20:37:01,955 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 11 [2021-12-16 20:37:01,982 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 7 proven. 68 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-16 20:37:01,982 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-16 20:37:02,499 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 14 proven. 30 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-12-16 20:37:02,499 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1436370388] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-16 20:37:02,499 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-16 20:37:02,499 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 22, 14] total 44 [2021-12-16 20:37:02,500 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [611817490] [2021-12-16 20:37:02,500 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-16 20:37:02,500 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2021-12-16 20:37:02,500 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-16 20:37:02,500 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-12-16 20:37:02,500 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=178, Invalid=1714, Unknown=0, NotChecked=0, Total=1892 [2021-12-16 20:37:02,501 INFO L87 Difference]: Start difference. First operand 463 states and 581 transitions. Second operand has 44 states, 44 states have (on average 3.022727272727273) internal successors, (133), 44 states have internal predecessors, (133), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-16 20:37:09,352 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-16 20:37:09,352 INFO L93 Difference]: Finished difference Result 1558 states and 2003 transitions. [2021-12-16 20:37:09,352 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2021-12-16 20:37:09,352 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 3.022727272727273) internal successors, (133), 44 states have internal predecessors, (133), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 59 [2021-12-16 20:37:09,353 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-16 20:37:09,355 INFO L225 Difference]: With dead ends: 1558 [2021-12-16 20:37:09,355 INFO L226 Difference]: Without dead ends: 1390 [2021-12-16 20:37:09,356 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 190 GetRequests, 87 SyntacticMatches, 0 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2569 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=1262, Invalid=9658, Unknown=0, NotChecked=0, Total=10920 [2021-12-16 20:37:09,357 INFO L933 BasicCegarLoop]: 174 mSDtfsCounter, 1205 mSDsluCounter, 3202 mSDsCounter, 0 mSdLazyCounter, 4133 mSolverCounterSat, 475 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1208 SdHoareTripleChecker+Valid, 3376 SdHoareTripleChecker+Invalid, 4608 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 475 IncrementalHoareTripleChecker+Valid, 4133 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.0s IncrementalHoareTripleChecker+Time [2021-12-16 20:37:09,357 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1208 Valid, 3376 Invalid, 4608 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [475 Valid, 4133 Invalid, 0 Unknown, 0 Unchecked, 3.0s Time] [2021-12-16 20:37:09,358 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1390 states. [2021-12-16 20:37:09,530 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1390 to 658. [2021-12-16 20:37:09,531 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 658 states, 642 states have (on average 1.2679127725856698) internal successors, (814), 644 states have internal predecessors, (814), 9 states have call successors, (9), 6 states have call predecessors, (9), 6 states have return successors, (8), 7 states have call predecessors, (8), 8 states have call successors, (8) [2021-12-16 20:37:09,531 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 658 states to 658 states and 831 transitions. [2021-12-16 20:37:09,531 INFO L78 Accepts]: Start accepts. Automaton has 658 states and 831 transitions. Word has length 59 [2021-12-16 20:37:09,531 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-16 20:37:09,531 INFO L470 AbstractCegarLoop]: Abstraction has 658 states and 831 transitions. [2021-12-16 20:37:09,532 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 3.022727272727273) internal successors, (133), 44 states have internal predecessors, (133), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-16 20:37:09,532 INFO L276 IsEmpty]: Start isEmpty. Operand 658 states and 831 transitions. [2021-12-16 20:37:09,532 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-12-16 20:37:09,533 INFO L506 BasicCegarLoop]: Found error trace [2021-12-16 20:37:09,533 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-16 20:37:09,549 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Ended with exit code 0 [2021-12-16 20:37:09,743 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable45 [2021-12-16 20:37:09,743 INFO L402 AbstractCegarLoop]: === Iteration 47 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-16 20:37:09,744 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-16 20:37:09,744 INFO L85 PathProgramCache]: Analyzing trace with hash 394119407, now seen corresponding path program 3 times [2021-12-16 20:37:09,744 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-16 20:37:09,744 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [747634288] [2021-12-16 20:37:09,744 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 20:37:09,744 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-16 20:37:09,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:37:09,901 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-12-16 20:37:09,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:37:09,909 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 39 [2021-12-16 20:37:09,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:37:09,915 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 48 [2021-12-16 20:37:09,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:37:09,918 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 2 proven. 18 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-12-16 20:37:09,918 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-16 20:37:09,918 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [747634288] [2021-12-16 20:37:09,919 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [747634288] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-16 20:37:09,919 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1138116952] [2021-12-16 20:37:09,919 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-16 20:37:09,919 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-16 20:37:09,919 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-16 20:37:09,920 INFO L229 MonitoredProcess]: Starting monitored process 42 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-16 20:37:09,928 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2021-12-16 20:37:10,182 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-12-16 20:37:10,182 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-16 20:37:10,184 INFO L263 TraceCheckSpWp]: Trace formula consists of 194 conjuncts, 24 conjunts are in the unsatisfiable core [2021-12-16 20:37:10,185 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-16 20:37:15,131 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 7 proven. 7 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-12-16 20:37:15,132 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-16 20:38:23,462 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 2 proven. 12 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-12-16 20:38:23,462 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1138116952] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-16 20:38:23,463 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-16 20:38:23,463 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 11, 11] total 31 [2021-12-16 20:38:23,463 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1321513164] [2021-12-16 20:38:23,463 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-16 20:38:23,463 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-12-16 20:38:23,463 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-16 20:38:23,464 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-12-16 20:38:23,464 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=796, Unknown=0, NotChecked=0, Total=930 [2021-12-16 20:38:23,464 INFO L87 Difference]: Start difference. First operand 658 states and 831 transitions. Second operand has 31 states, 31 states have (on average 3.2903225806451615) internal successors, (102), 31 states have internal predecessors, (102), 10 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-12-16 20:38:35,914 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-16 20:38:35,915 INFO L93 Difference]: Finished difference Result 1485 states and 1908 transitions. [2021-12-16 20:38:35,915 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2021-12-16 20:38:35,915 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 3.2903225806451615) internal successors, (102), 31 states have internal predecessors, (102), 10 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) Word has length 63 [2021-12-16 20:38:35,915 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-16 20:38:35,918 INFO L225 Difference]: With dead ends: 1485 [2021-12-16 20:38:35,918 INFO L226 Difference]: Without dead ends: 1364 [2021-12-16 20:38:35,919 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 218 GetRequests, 116 SyntacticMatches, 1 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2909 ImplicationChecksByTransitivity, 10.0s TimeCoverageRelationStatistics Valid=1981, Invalid=8525, Unknown=0, NotChecked=0, Total=10506 [2021-12-16 20:38:35,919 INFO L933 BasicCegarLoop]: 102 mSDtfsCounter, 1216 mSDsluCounter, 826 mSDsCounter, 0 mSdLazyCounter, 1317 mSolverCounterSat, 480 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1218 SdHoareTripleChecker+Valid, 928 SdHoareTripleChecker+Invalid, 1797 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 480 IncrementalHoareTripleChecker+Valid, 1317 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.8s IncrementalHoareTripleChecker+Time [2021-12-16 20:38:35,919 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1218 Valid, 928 Invalid, 1797 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [480 Valid, 1317 Invalid, 0 Unknown, 0 Unchecked, 2.8s Time] [2021-12-16 20:38:35,920 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1364 states. [2021-12-16 20:38:36,132 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1364 to 753. [2021-12-16 20:38:36,133 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 753 states, 727 states have (on average 1.248968363136176) internal successors, (908), 730 states have internal predecessors, (908), 19 states have call successors, (19), 6 states have call predecessors, (19), 6 states have return successors, (18), 16 states have call predecessors, (18), 18 states have call successors, (18) [2021-12-16 20:38:36,134 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 753 states to 753 states and 945 transitions. [2021-12-16 20:38:36,134 INFO L78 Accepts]: Start accepts. Automaton has 753 states and 945 transitions. Word has length 63 [2021-12-16 20:38:36,134 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-16 20:38:36,134 INFO L470 AbstractCegarLoop]: Abstraction has 753 states and 945 transitions. [2021-12-16 20:38:36,135 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 3.2903225806451615) internal successors, (102), 31 states have internal predecessors, (102), 10 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-12-16 20:38:36,135 INFO L276 IsEmpty]: Start isEmpty. Operand 753 states and 945 transitions. [2021-12-16 20:38:36,136 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-12-16 20:38:36,136 INFO L506 BasicCegarLoop]: Found error trace [2021-12-16 20:38:36,136 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-16 20:38:36,155 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Forceful destruction successful, exit code 0 [2021-12-16 20:38:36,351 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable46 [2021-12-16 20:38:36,351 INFO L402 AbstractCegarLoop]: === Iteration 48 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-16 20:38:36,352 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-16 20:38:36,352 INFO L85 PathProgramCache]: Analyzing trace with hash 1755687522, now seen corresponding path program 3 times [2021-12-16 20:38:36,352 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-16 20:38:36,352 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1388478868] [2021-12-16 20:38:36,352 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 20:38:36,352 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-16 20:38:36,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:38:36,486 INFO L134 CoverageAnalysis]: Checked inductivity of 118 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-12-16 20:38:36,486 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-16 20:38:36,486 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1388478868] [2021-12-16 20:38:36,486 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1388478868] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-16 20:38:36,486 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1752596265] [2021-12-16 20:38:36,486 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-16 20:38:36,486 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-16 20:38:36,486 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-16 20:38:36,487 INFO L229 MonitoredProcess]: Starting monitored process 43 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-16 20:38:36,488 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Waiting until timeout for monitored process [2021-12-16 20:38:36,711 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-12-16 20:38:36,711 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-16 20:38:36,712 INFO L263 TraceCheckSpWp]: Trace formula consists of 208 conjuncts, 20 conjunts are in the unsatisfiable core [2021-12-16 20:38:36,713 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-16 20:38:36,913 INFO L134 CoverageAnalysis]: Checked inductivity of 118 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 103 trivial. 0 not checked. [2021-12-16 20:38:36,913 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-16 20:38:37,206 INFO L134 CoverageAnalysis]: Checked inductivity of 118 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2021-12-16 20:38:37,207 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1752596265] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-16 20:38:37,207 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-16 20:38:37,207 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 10, 10] total 30 [2021-12-16 20:38:37,207 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1109172922] [2021-12-16 20:38:37,207 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-16 20:38:37,207 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2021-12-16 20:38:37,207 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-16 20:38:37,208 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-12-16 20:38:37,208 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=796, Unknown=0, NotChecked=0, Total=870 [2021-12-16 20:38:37,208 INFO L87 Difference]: Start difference. First operand 753 states and 945 transitions. Second operand has 30 states, 29 states have (on average 3.1724137931034484) internal successors, (92), 29 states have internal predecessors, (92), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-16 20:38:39,050 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-16 20:38:39,051 INFO L93 Difference]: Finished difference Result 901 states and 1141 transitions. [2021-12-16 20:38:39,051 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-12-16 20:38:39,051 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 29 states have (on average 3.1724137931034484) internal successors, (92), 29 states have internal predecessors, (92), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 60 [2021-12-16 20:38:39,052 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-16 20:38:39,053 INFO L225 Difference]: With dead ends: 901 [2021-12-16 20:38:39,053 INFO L226 Difference]: Without dead ends: 850 [2021-12-16 20:38:39,054 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 175 GetRequests, 108 SyntacticMatches, 0 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 713 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=548, Invalid=4144, Unknown=0, NotChecked=0, Total=4692 [2021-12-16 20:38:39,054 INFO L933 BasicCegarLoop]: 66 mSDtfsCounter, 700 mSDsluCounter, 1256 mSDsCounter, 0 mSdLazyCounter, 1111 mSolverCounterSat, 174 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 700 SdHoareTripleChecker+Valid, 1322 SdHoareTripleChecker+Invalid, 1285 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 174 IncrementalHoareTripleChecker+Valid, 1111 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-12-16 20:38:39,054 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [700 Valid, 1322 Invalid, 1285 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [174 Valid, 1111 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-12-16 20:38:39,055 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 850 states. [2021-12-16 20:38:39,272 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 850 to 761. [2021-12-16 20:38:39,273 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 761 states, 735 states have (on average 1.2476190476190476) internal successors, (917), 738 states have internal predecessors, (917), 19 states have call successors, (19), 6 states have call predecessors, (19), 6 states have return successors, (18), 16 states have call predecessors, (18), 18 states have call successors, (18) [2021-12-16 20:38:39,274 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 761 states to 761 states and 954 transitions. [2021-12-16 20:38:39,274 INFO L78 Accepts]: Start accepts. Automaton has 761 states and 954 transitions. Word has length 60 [2021-12-16 20:38:39,274 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-16 20:38:39,274 INFO L470 AbstractCegarLoop]: Abstraction has 761 states and 954 transitions. [2021-12-16 20:38:39,274 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 29 states have (on average 3.1724137931034484) internal successors, (92), 29 states have internal predecessors, (92), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-16 20:38:39,275 INFO L276 IsEmpty]: Start isEmpty. Operand 761 states and 954 transitions. [2021-12-16 20:38:39,275 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-12-16 20:38:39,276 INFO L506 BasicCegarLoop]: Found error trace [2021-12-16 20:38:39,276 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 4, 4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-16 20:38:39,280 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Ended with exit code 0 [2021-12-16 20:38:39,476 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47,43 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-16 20:38:39,477 INFO L402 AbstractCegarLoop]: === Iteration 49 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-16 20:38:39,477 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-16 20:38:39,477 INFO L85 PathProgramCache]: Analyzing trace with hash 1226296938, now seen corresponding path program 11 times [2021-12-16 20:38:39,477 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-16 20:38:39,477 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [622832843] [2021-12-16 20:38:39,477 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 20:38:39,477 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-16 20:38:39,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:38:39,904 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 59 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-12-16 20:38:39,905 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-16 20:38:39,905 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [622832843] [2021-12-16 20:38:39,905 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [622832843] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-16 20:38:39,905 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1658961207] [2021-12-16 20:38:39,905 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-12-16 20:38:39,905 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-16 20:38:39,905 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-16 20:38:39,906 INFO L229 MonitoredProcess]: Starting monitored process 44 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-16 20:38:39,907 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Waiting until timeout for monitored process [2021-12-16 20:38:43,272 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2021-12-16 20:38:43,273 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-16 20:38:43,283 INFO L263 TraceCheckSpWp]: Trace formula consists of 266 conjuncts, 74 conjunts are in the unsatisfiable core [2021-12-16 20:38:43,285 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-16 20:38:43,415 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-12-16 20:38:44,039 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 13 proven. 62 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-12-16 20:38:44,039 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-16 20:38:45,481 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 15 proven. 34 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-12-16 20:38:45,482 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1658961207] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-16 20:38:45,482 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-16 20:38:45,482 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21, 19] total 56 [2021-12-16 20:38:45,482 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [629040371] [2021-12-16 20:38:45,482 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-16 20:38:45,482 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2021-12-16 20:38:45,482 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-16 20:38:45,483 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2021-12-16 20:38:45,483 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=204, Invalid=2876, Unknown=0, NotChecked=0, Total=3080 [2021-12-16 20:38:45,483 INFO L87 Difference]: Start difference. First operand 761 states and 954 transitions. Second operand has 56 states, 56 states have (on average 2.517857142857143) internal successors, (141), 55 states have internal predecessors, (141), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-16 20:40:24,334 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-16 20:40:24,334 INFO L93 Difference]: Finished difference Result 5201 states and 6767 transitions. [2021-12-16 20:40:24,334 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 213 states. [2021-12-16 20:40:24,334 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 56 states have (on average 2.517857142857143) internal successors, (141), 55 states have internal predecessors, (141), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 60 [2021-12-16 20:40:24,334 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-16 20:40:24,350 INFO L225 Difference]: With dead ends: 5201 [2021-12-16 20:40:24,350 INFO L226 Difference]: Without dead ends: 4200 [2021-12-16 20:40:24,355 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 342 GetRequests, 85 SyntacticMatches, 2 SemanticMatches, 255 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21080 ImplicationChecksByTransitivity, 76.9s TimeCoverageRelationStatistics Valid=5555, Invalid=60237, Unknown=0, NotChecked=0, Total=65792 [2021-12-16 20:40:24,356 INFO L933 BasicCegarLoop]: 298 mSDtfsCounter, 3841 mSDsluCounter, 7053 mSDsCounter, 0 mSdLazyCounter, 11193 mSolverCounterSat, 1147 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 19.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3841 SdHoareTripleChecker+Valid, 7351 SdHoareTripleChecker+Invalid, 12340 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1147 IncrementalHoareTripleChecker+Valid, 11193 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 21.1s IncrementalHoareTripleChecker+Time [2021-12-16 20:40:24,356 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3841 Valid, 7351 Invalid, 12340 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1147 Valid, 11193 Invalid, 0 Unknown, 0 Unchecked, 21.1s Time] [2021-12-16 20:40:24,359 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4200 states. [2021-12-16 20:40:24,664 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4200 to 920. [2021-12-16 20:40:24,665 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 920 states, 894 states have (on average 1.2606263982102908) internal successors, (1127), 897 states have internal predecessors, (1127), 19 states have call successors, (19), 6 states have call predecessors, (19), 6 states have return successors, (18), 16 states have call predecessors, (18), 18 states have call successors, (18) [2021-12-16 20:40:24,666 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 920 states to 920 states and 1164 transitions. [2021-12-16 20:40:24,667 INFO L78 Accepts]: Start accepts. Automaton has 920 states and 1164 transitions. Word has length 60 [2021-12-16 20:40:24,667 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-16 20:40:24,667 INFO L470 AbstractCegarLoop]: Abstraction has 920 states and 1164 transitions. [2021-12-16 20:40:24,667 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 56 states, 56 states have (on average 2.517857142857143) internal successors, (141), 55 states have internal predecessors, (141), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-16 20:40:24,668 INFO L276 IsEmpty]: Start isEmpty. Operand 920 states and 1164 transitions. [2021-12-16 20:40:24,669 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-12-16 20:40:24,669 INFO L506 BasicCegarLoop]: Found error trace [2021-12-16 20:40:24,669 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 4, 4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-16 20:40:24,681 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Forceful destruction successful, exit code 0 [2021-12-16 20:40:24,876 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable48 [2021-12-16 20:40:24,876 INFO L402 AbstractCegarLoop]: === Iteration 50 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-16 20:40:24,876 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-16 20:40:24,876 INFO L85 PathProgramCache]: Analyzing trace with hash -52848528, now seen corresponding path program 12 times [2021-12-16 20:40:24,877 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-16 20:40:24,877 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [478332126] [2021-12-16 20:40:24,877 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 20:40:24,877 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-16 20:40:24,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:40:25,619 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-16 20:40:25,620 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-16 20:40:25,620 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [478332126] [2021-12-16 20:40:25,620 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [478332126] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-16 20:40:25,620 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [589776844] [2021-12-16 20:40:25,620 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-12-16 20:40:25,620 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-16 20:40:25,620 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-16 20:40:25,621 INFO L229 MonitoredProcess]: Starting monitored process 45 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-16 20:40:25,622 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Waiting until timeout for monitored process [2021-12-16 20:40:26,087 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 6 check-sat command(s) [2021-12-16 20:40:26,087 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-16 20:40:26,089 INFO L263 TraceCheckSpWp]: Trace formula consists of 275 conjuncts, 26 conjunts are in the unsatisfiable core [2021-12-16 20:40:26,090 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-16 20:40:26,418 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 5 proven. 38 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2021-12-16 20:40:26,418 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-16 20:41:02,201 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 5 proven. 38 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2021-12-16 20:41:02,201 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [589776844] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-16 20:41:02,201 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-16 20:41:02,201 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 14, 14] total 46 [2021-12-16 20:41:02,201 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [777683242] [2021-12-16 20:41:02,201 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-16 20:41:02,201 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2021-12-16 20:41:02,201 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-16 20:41:02,202 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-12-16 20:41:02,202 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=145, Invalid=1912, Unknown=13, NotChecked=0, Total=2070 [2021-12-16 20:41:02,202 INFO L87 Difference]: Start difference. First operand 920 states and 1164 transitions. Second operand has 46 states, 46 states have (on average 2.5869565217391304) internal successors, (119), 46 states have internal predecessors, (119), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-16 20:41:13,284 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-12-16 20:42:50,390 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-16 20:42:50,390 INFO L93 Difference]: Finished difference Result 6865 states and 8685 transitions. [2021-12-16 20:42:50,391 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 268 states. [2021-12-16 20:42:50,391 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 2.5869565217391304) internal successors, (119), 46 states have internal predecessors, (119), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 62 [2021-12-16 20:42:50,391 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-16 20:42:50,403 INFO L225 Difference]: With dead ends: 6865 [2021-12-16 20:42:50,403 INFO L226 Difference]: Without dead ends: 6654 [2021-12-16 20:42:50,409 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 403 GetRequests, 105 SyntacticMatches, 2 SemanticMatches, 296 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33015 ImplicationChecksByTransitivity, 129.8s TimeCoverageRelationStatistics Valid=6142, Invalid=82351, Unknown=13, NotChecked=0, Total=88506 [2021-12-16 20:42:50,409 INFO L933 BasicCegarLoop]: 443 mSDtfsCounter, 5165 mSDsluCounter, 11941 mSDsCounter, 0 mSdLazyCounter, 8546 mSolverCounterSat, 1365 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 9.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5169 SdHoareTripleChecker+Valid, 12384 SdHoareTripleChecker+Invalid, 11341 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1365 IncrementalHoareTripleChecker+Valid, 8546 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 1429 IncrementalHoareTripleChecker+Unchecked, 10.1s IncrementalHoareTripleChecker+Time [2021-12-16 20:42:50,409 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5169 Valid, 12384 Invalid, 11341 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1365 Valid, 8546 Invalid, 1 Unknown, 1429 Unchecked, 10.1s Time] [2021-12-16 20:42:50,413 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6654 states. [2021-12-16 20:42:50,744 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6654 to 799. [2021-12-16 20:42:50,744 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 799 states, 773 states have (on average 1.2509702457956016) internal successors, (967), 776 states have internal predecessors, (967), 19 states have call successors, (19), 6 states have call predecessors, (19), 6 states have return successors, (18), 16 states have call predecessors, (18), 18 states have call successors, (18) [2021-12-16 20:42:50,745 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 799 states to 799 states and 1004 transitions. [2021-12-16 20:42:50,745 INFO L78 Accepts]: Start accepts. Automaton has 799 states and 1004 transitions. Word has length 62 [2021-12-16 20:42:50,746 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-16 20:42:50,746 INFO L470 AbstractCegarLoop]: Abstraction has 799 states and 1004 transitions. [2021-12-16 20:42:50,746 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 2.5869565217391304) internal successors, (119), 46 states have internal predecessors, (119), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-16 20:42:50,746 INFO L276 IsEmpty]: Start isEmpty. Operand 799 states and 1004 transitions. [2021-12-16 20:42:50,747 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-12-16 20:42:50,747 INFO L506 BasicCegarLoop]: Found error trace [2021-12-16 20:42:50,747 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-16 20:42:50,752 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Forceful destruction successful, exit code 0 [2021-12-16 20:42:50,947 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable49 [2021-12-16 20:42:50,948 INFO L402 AbstractCegarLoop]: === Iteration 51 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-16 20:42:50,948 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-16 20:42:50,948 INFO L85 PathProgramCache]: Analyzing trace with hash -1808949996, now seen corresponding path program 2 times [2021-12-16 20:42:50,948 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-16 20:42:50,948 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2086440917] [2021-12-16 20:42:50,949 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 20:42:50,949 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-16 20:42:50,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:42:51,008 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 30 [2021-12-16 20:42:51,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:42:51,010 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 41 [2021-12-16 20:42:51,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:42:51,013 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 51 [2021-12-16 20:42:51,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:42:51,014 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2021-12-16 20:42:51,015 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-16 20:42:51,015 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2086440917] [2021-12-16 20:42:51,015 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2086440917] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-16 20:42:51,015 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-16 20:42:51,015 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-12-16 20:42:51,015 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1577240343] [2021-12-16 20:42:51,015 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-16 20:42:51,015 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-12-16 20:42:51,016 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-16 20:42:51,016 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-12-16 20:42:51,016 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-12-16 20:42:51,016 INFO L87 Difference]: Start difference. First operand 799 states and 1004 transitions. Second operand has 6 states, 6 states have (on average 7.666666666666667) internal successors, (46), 6 states have internal predecessors, (46), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-12-16 20:42:51,360 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-16 20:42:51,361 INFO L93 Difference]: Finished difference Result 841 states and 1056 transitions. [2021-12-16 20:42:51,361 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-16 20:42:51,361 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 7.666666666666667) internal successors, (46), 6 states have internal predecessors, (46), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 66 [2021-12-16 20:42:51,361 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-16 20:42:51,363 INFO L225 Difference]: With dead ends: 841 [2021-12-16 20:42:51,363 INFO L226 Difference]: Without dead ends: 811 [2021-12-16 20:42:51,363 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-12-16 20:42:51,363 INFO L933 BasicCegarLoop]: 60 mSDtfsCounter, 11 mSDsluCounter, 100 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 160 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-16 20:42:51,363 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 160 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 37 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-16 20:42:51,364 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 811 states. [2021-12-16 20:42:51,680 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 811 to 807. [2021-12-16 20:42:51,681 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 807 states, 781 states have (on average 1.2471190781049937) internal successors, (974), 784 states have internal predecessors, (974), 19 states have call successors, (19), 6 states have call predecessors, (19), 6 states have return successors, (18), 16 states have call predecessors, (18), 18 states have call successors, (18) [2021-12-16 20:42:51,682 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 807 states to 807 states and 1011 transitions. [2021-12-16 20:42:51,682 INFO L78 Accepts]: Start accepts. Automaton has 807 states and 1011 transitions. Word has length 66 [2021-12-16 20:42:51,682 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-16 20:42:51,682 INFO L470 AbstractCegarLoop]: Abstraction has 807 states and 1011 transitions. [2021-12-16 20:42:51,682 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 7.666666666666667) internal successors, (46), 6 states have internal predecessors, (46), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-12-16 20:42:51,682 INFO L276 IsEmpty]: Start isEmpty. Operand 807 states and 1011 transitions. [2021-12-16 20:42:51,684 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-12-16 20:42:51,684 INFO L506 BasicCegarLoop]: Found error trace [2021-12-16 20:42:51,684 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-16 20:42:51,684 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50 [2021-12-16 20:42:51,684 INFO L402 AbstractCegarLoop]: === Iteration 52 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-16 20:42:51,684 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-16 20:42:51,684 INFO L85 PathProgramCache]: Analyzing trace with hash -855991739, now seen corresponding path program 1 times [2021-12-16 20:42:51,684 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-16 20:42:51,684 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [781688442] [2021-12-16 20:42:51,684 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 20:42:51,684 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-16 20:42:51,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:42:52,125 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 32 [2021-12-16 20:42:52,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:42:52,131 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 42 [2021-12-16 20:42:52,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:42:52,133 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 52 [2021-12-16 20:42:52,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:42:52,153 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 11 proven. 22 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-12-16 20:42:52,154 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-16 20:42:52,154 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [781688442] [2021-12-16 20:42:52,154 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [781688442] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-16 20:42:52,154 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [309350473] [2021-12-16 20:42:52,154 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 20:42:52,154 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-16 20:42:52,154 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-16 20:42:52,155 INFO L229 MonitoredProcess]: Starting monitored process 46 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-16 20:42:52,156 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Waiting until timeout for monitored process [2021-12-16 20:42:52,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:42:52,255 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 50 conjunts are in the unsatisfiable core [2021-12-16 20:42:52,257 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-16 20:42:52,291 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-16 20:42:52,524 INFO L354 Elim1Store]: treesize reduction 15, result has 6.3 percent of original size [2021-12-16 20:42:52,525 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 34 treesize of output 10 [2021-12-16 20:42:52,559 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 11 proven. 22 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-12-16 20:42:52,559 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-16 20:42:52,821 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 19 proven. 4 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-12-16 20:42:52,821 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [309350473] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-16 20:42:52,821 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-16 20:42:52,822 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 14, 12] total 35 [2021-12-16 20:42:52,822 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1319512653] [2021-12-16 20:42:52,822 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-16 20:42:52,822 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-12-16 20:42:52,822 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-16 20:42:52,822 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-12-16 20:42:52,823 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=169, Invalid=1021, Unknown=0, NotChecked=0, Total=1190 [2021-12-16 20:42:52,823 INFO L87 Difference]: Start difference. First operand 807 states and 1011 transitions. Second operand has 35 states, 33 states have (on average 3.3636363636363638) internal successors, (111), 35 states have internal predecessors, (111), 8 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 6 states have call predecessors, (7), 7 states have call successors, (7) [2021-12-16 20:42:54,128 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-16 20:42:54,128 INFO L93 Difference]: Finished difference Result 1061 states and 1333 transitions. [2021-12-16 20:42:54,128 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-12-16 20:42:54,129 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 33 states have (on average 3.3636363636363638) internal successors, (111), 35 states have internal predecessors, (111), 8 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 6 states have call predecessors, (7), 7 states have call successors, (7) Word has length 67 [2021-12-16 20:42:54,129 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-16 20:42:54,130 INFO L225 Difference]: With dead ends: 1061 [2021-12-16 20:42:54,130 INFO L226 Difference]: Without dead ends: 988 [2021-12-16 20:42:54,131 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 165 GetRequests, 118 SyntacticMatches, 5 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 614 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=297, Invalid=1595, Unknown=0, NotChecked=0, Total=1892 [2021-12-16 20:42:54,131 INFO L933 BasicCegarLoop]: 78 mSDtfsCounter, 280 mSDsluCounter, 1124 mSDsCounter, 0 mSdLazyCounter, 1012 mSolverCounterSat, 88 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 288 SdHoareTripleChecker+Valid, 1202 SdHoareTripleChecker+Invalid, 1100 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 88 IncrementalHoareTripleChecker+Valid, 1012 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-12-16 20:42:54,131 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [288 Valid, 1202 Invalid, 1100 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [88 Valid, 1012 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-12-16 20:42:54,132 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 988 states. [2021-12-16 20:42:54,441 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 988 to 819. [2021-12-16 20:42:54,442 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 819 states, 791 states have (on average 1.2414664981036663) internal successors, (982), 794 states have internal predecessors, (982), 21 states have call successors, (21), 6 states have call predecessors, (21), 6 states have return successors, (20), 18 states have call predecessors, (20), 20 states have call successors, (20) [2021-12-16 20:42:54,443 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 819 states to 819 states and 1023 transitions. [2021-12-16 20:42:54,443 INFO L78 Accepts]: Start accepts. Automaton has 819 states and 1023 transitions. Word has length 67 [2021-12-16 20:42:54,443 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-16 20:42:54,443 INFO L470 AbstractCegarLoop]: Abstraction has 819 states and 1023 transitions. [2021-12-16 20:42:54,443 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 33 states have (on average 3.3636363636363638) internal successors, (111), 35 states have internal predecessors, (111), 8 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 6 states have call predecessors, (7), 7 states have call successors, (7) [2021-12-16 20:42:54,443 INFO L276 IsEmpty]: Start isEmpty. Operand 819 states and 1023 transitions. [2021-12-16 20:42:54,444 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-12-16 20:42:54,444 INFO L506 BasicCegarLoop]: Found error trace [2021-12-16 20:42:54,445 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-16 20:42:54,461 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Ended with exit code 0 [2021-12-16 20:42:54,645 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable51 [2021-12-16 20:42:54,645 INFO L402 AbstractCegarLoop]: === Iteration 53 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-16 20:42:54,646 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-16 20:42:54,646 INFO L85 PathProgramCache]: Analyzing trace with hash -1292876336, now seen corresponding path program 1 times [2021-12-16 20:42:54,646 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-16 20:42:54,646 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1590567871] [2021-12-16 20:42:54,646 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 20:42:54,646 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-16 20:42:54,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:42:56,355 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 30 [2021-12-16 20:42:56,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:42:56,368 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 41 [2021-12-16 20:42:56,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:42:56,371 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 52 [2021-12-16 20:42:56,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:42:56,373 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 4 proven. 23 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-12-16 20:42:56,373 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-16 20:42:56,373 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1590567871] [2021-12-16 20:42:56,374 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1590567871] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-16 20:42:56,374 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2062806260] [2021-12-16 20:42:56,374 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 20:42:56,374 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-16 20:42:56,374 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-16 20:42:56,375 INFO L229 MonitoredProcess]: Starting monitored process 47 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-16 20:42:56,377 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Waiting until timeout for monitored process [2021-12-16 20:42:56,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:42:56,471 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 21 conjunts are in the unsatisfiable core [2021-12-16 20:42:56,472 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-16 20:42:57,019 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2021-12-16 20:42:57,019 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-16 20:42:57,751 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 4 proven. 14 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-12-16 20:42:57,751 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2062806260] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-16 20:42:57,751 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-16 20:42:57,751 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 12, 12] total 38 [2021-12-16 20:42:57,751 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1925468629] [2021-12-16 20:42:57,751 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-16 20:42:57,752 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2021-12-16 20:42:57,752 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-16 20:42:57,752 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-12-16 20:42:57,752 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=1268, Unknown=0, NotChecked=0, Total=1406 [2021-12-16 20:42:57,752 INFO L87 Difference]: Start difference. First operand 819 states and 1023 transitions. Second operand has 38 states, 38 states have (on average 2.473684210526316) internal successors, (94), 38 states have internal predecessors, (94), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-12-16 20:43:45,913 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-12-16 20:43:54,390 WARN L227 SmtUtils]: Spent 5.12s on a formula simplification. DAG size of input: 151 DAG size of output: 94 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-12-16 20:45:11,090 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-16 20:45:11,090 INFO L93 Difference]: Finished difference Result 1921 states and 2417 transitions. [2021-12-16 20:45:11,095 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 79 states. [2021-12-16 20:45:11,095 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 2.473684210526316) internal successors, (94), 38 states have internal predecessors, (94), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 67 [2021-12-16 20:45:11,096 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-16 20:45:11,098 INFO L225 Difference]: With dead ends: 1921 [2021-12-16 20:45:11,098 INFO L226 Difference]: Without dead ends: 1821 [2021-12-16 20:45:11,099 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 236 GetRequests, 123 SyntacticMatches, 3 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3473 ImplicationChecksByTransitivity, 113.1s TimeCoverageRelationStatistics Valid=1654, Invalid=10773, Unknown=5, NotChecked=0, Total=12432 [2021-12-16 20:45:11,099 INFO L933 BasicCegarLoop]: 79 mSDtfsCounter, 2467 mSDsluCounter, 1241 mSDsCounter, 0 mSdLazyCounter, 1594 mSolverCounterSat, 290 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 20.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2467 SdHoareTripleChecker+Valid, 1320 SdHoareTripleChecker+Invalid, 1885 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 290 IncrementalHoareTripleChecker+Valid, 1594 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 21.1s IncrementalHoareTripleChecker+Time [2021-12-16 20:45:11,099 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2467 Valid, 1320 Invalid, 1885 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [290 Valid, 1594 Invalid, 1 Unknown, 0 Unchecked, 21.1s Time] [2021-12-16 20:45:11,100 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1821 states. [2021-12-16 20:45:11,410 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1821 to 787. [2021-12-16 20:45:11,411 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 787 states, 764 states have (on average 1.2408376963350785) internal successors, (948), 766 states have internal predecessors, (948), 16 states have call successors, (16), 6 states have call predecessors, (16), 6 states have return successors, (15), 14 states have call predecessors, (15), 15 states have call successors, (15) [2021-12-16 20:45:11,412 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 787 states to 787 states and 979 transitions. [2021-12-16 20:45:11,412 INFO L78 Accepts]: Start accepts. Automaton has 787 states and 979 transitions. Word has length 67 [2021-12-16 20:45:11,412 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-16 20:45:11,412 INFO L470 AbstractCegarLoop]: Abstraction has 787 states and 979 transitions. [2021-12-16 20:45:11,412 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 2.473684210526316) internal successors, (94), 38 states have internal predecessors, (94), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-12-16 20:45:11,412 INFO L276 IsEmpty]: Start isEmpty. Operand 787 states and 979 transitions. [2021-12-16 20:45:11,413 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-12-16 20:45:11,413 INFO L506 BasicCegarLoop]: Found error trace [2021-12-16 20:45:11,413 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 9, 4, 4, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-16 20:45:11,431 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Ended with exit code 0 [2021-12-16 20:45:11,614 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52,47 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-16 20:45:11,614 INFO L402 AbstractCegarLoop]: === Iteration 54 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-16 20:45:11,614 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-16 20:45:11,614 INFO L85 PathProgramCache]: Analyzing trace with hash 1152882430, now seen corresponding path program 2 times [2021-12-16 20:45:11,615 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-16 20:45:11,615 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1027112876] [2021-12-16 20:45:11,615 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 20:45:11,615 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-16 20:45:11,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:45:11,789 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 0 proven. 117 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-12-16 20:45:11,789 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-16 20:45:11,789 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1027112876] [2021-12-16 20:45:11,789 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1027112876] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-16 20:45:11,789 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [679729171] [2021-12-16 20:45:11,790 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-16 20:45:11,790 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-16 20:45:11,790 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-16 20:45:11,791 INFO L229 MonitoredProcess]: Starting monitored process 48 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-16 20:45:11,792 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Waiting until timeout for monitored process [2021-12-16 20:45:11,980 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-16 20:45:11,981 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-16 20:45:11,983 INFO L263 TraceCheckSpWp]: Trace formula consists of 287 conjuncts, 27 conjunts are in the unsatisfiable core [2021-12-16 20:45:11,993 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-16 20:45:12,436 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 0 proven. 124 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-12-16 20:45:12,437 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-16 20:46:46,576 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 0 proven. 115 refuted. 9 times theorem prover too weak. 21 trivial. 0 not checked. [2021-12-16 20:46:46,576 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [679729171] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-16 20:46:46,576 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-16 20:46:46,576 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 16, 16] total 43 [2021-12-16 20:46:46,576 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1731028716] [2021-12-16 20:46:46,576 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-16 20:46:46,577 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2021-12-16 20:46:46,577 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-16 20:46:46,577 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-12-16 20:46:46,577 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=168, Invalid=1607, Unknown=31, NotChecked=0, Total=1806 [2021-12-16 20:46:46,577 INFO L87 Difference]: Start difference. First operand 787 states and 979 transitions. Second operand has 43 states, 42 states have (on average 3.5476190476190474) internal successors, (149), 42 states have internal predecessors, (149), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-16 20:47:31,591 WARN L838 $PredicateComparison]: unable to prove that (and (<= 0 (div (+ (* (mod |c_ULTIMATE.start_main_~pat_len~0#1| 4294967296) (- 1)) 7) 4294967296)) (forall ((|aux_mod_aux_mod_ULTIMATE.start_main_~pat_len~0#1_51_78| Int) (|aux_div_aux_mod_ULTIMATE.start_main_~pat_len~0#1_51_78| Int)) (or (<= 0 |aux_div_aux_mod_ULTIMATE.start_main_~pat_len~0#1_51_78|) (< (mod (+ |c_ULTIMATE.start_main_~j~0#1| 1) 4294967296) (mod (+ (* |aux_mod_aux_mod_ULTIMATE.start_main_~pat_len~0#1_51_78| 4294967295) 7) 4294967296)) (<= (+ |aux_mod_aux_mod_ULTIMATE.start_main_~pat_len~0#1_51_78| (* 4294967296 |aux_div_aux_mod_ULTIMATE.start_main_~pat_len~0#1_51_78|) 4294967289) 0) (<= 4294967296 |aux_mod_aux_mod_ULTIMATE.start_main_~pat_len~0#1_51_78|))) (forall ((|aux_mod_aux_mod_ULTIMATE.start_main_~pat_len~0#1_51_78| Int) (|aux_div_aux_mod_ULTIMATE.start_main_~pat_len~0#1_51_78| Int)) (or (< (mod (+ |c_ULTIMATE.start_main_~j~0#1| 2) 4294967296) (mod (+ (* |aux_mod_aux_mod_ULTIMATE.start_main_~pat_len~0#1_51_78| 4294967295) 7) 4294967296)) (<= 0 |aux_div_aux_mod_ULTIMATE.start_main_~pat_len~0#1_51_78|) (<= (+ |aux_mod_aux_mod_ULTIMATE.start_main_~pat_len~0#1_51_78| (* 4294967296 |aux_div_aux_mod_ULTIMATE.start_main_~pat_len~0#1_51_78|) 4294967289) 0) (<= 4294967296 |aux_mod_aux_mod_ULTIMATE.start_main_~pat_len~0#1_51_78|))) (forall ((|aux_mod_aux_mod_ULTIMATE.start_main_~pat_len~0#1_51_78| Int) (|aux_div_aux_mod_ULTIMATE.start_main_~pat_len~0#1_51_78| Int)) (or (< (mod |c_ULTIMATE.start_main_~j~0#1| 4294967296) (mod (+ (* |aux_mod_aux_mod_ULTIMATE.start_main_~pat_len~0#1_51_78| 4294967295) 7) 4294967296)) (<= 0 |aux_div_aux_mod_ULTIMATE.start_main_~pat_len~0#1_51_78|) (<= (+ |aux_mod_aux_mod_ULTIMATE.start_main_~pat_len~0#1_51_78| (* 4294967296 |aux_div_aux_mod_ULTIMATE.start_main_~pat_len~0#1_51_78|) 4294967289) 0) (<= 4294967296 |aux_mod_aux_mod_ULTIMATE.start_main_~pat_len~0#1_51_78|)))) is different from false Killed by 15