./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/combinations/square_8+soft_float_3a.c.cil.c --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/combinations/square_8+soft_float_3a.c.cil.c -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 98ed95c4a54f5ccebfa7d8542fee1c186675c886b13abb30be9edee4d8cb102c --- Real Ultimate output --- This is Ultimate 0.2.2-tmp.no-commuhash-c3fed41 [2021-12-17 21:42:58,331 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-12-17 21:42:58,338 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-12-17 21:42:58,381 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-12-17 21:42:58,382 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-12-17 21:42:58,384 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-12-17 21:42:58,385 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-12-17 21:42:58,387 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-12-17 21:42:58,389 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-12-17 21:42:58,392 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-12-17 21:42:58,393 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-12-17 21:42:58,394 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-12-17 21:42:58,394 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-12-17 21:42:58,396 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-12-17 21:42:58,397 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-12-17 21:42:58,401 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-12-17 21:42:58,402 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-12-17 21:42:58,403 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-12-17 21:42:58,405 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-12-17 21:42:58,409 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-12-17 21:42:58,410 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-12-17 21:42:58,411 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-12-17 21:42:58,412 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-12-17 21:42:58,413 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-12-17 21:42:58,418 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-12-17 21:42:58,418 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-12-17 21:42:58,418 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-12-17 21:42:58,419 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-12-17 21:42:58,420 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-12-17 21:42:58,420 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-12-17 21:42:58,421 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-12-17 21:42:58,421 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-12-17 21:42:58,422 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-12-17 21:42:58,423 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-12-17 21:42:58,424 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-12-17 21:42:58,424 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-12-17 21:42:58,425 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-12-17 21:42:58,425 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-12-17 21:42:58,425 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-12-17 21:42:58,425 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-12-17 21:42:58,426 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-12-17 21:42:58,426 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2021-12-17 21:42:58,451 INFO L113 SettingsManager]: Loading preferences was successful [2021-12-17 21:42:58,452 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-12-17 21:42:58,452 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-12-17 21:42:58,453 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-12-17 21:42:58,453 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-12-17 21:42:58,453 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-12-17 21:42:58,454 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-12-17 21:42:58,454 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-12-17 21:42:58,454 INFO L138 SettingsManager]: * Use SBE=true [2021-12-17 21:42:58,455 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-12-17 21:42:58,455 INFO L138 SettingsManager]: * sizeof long=4 [2021-12-17 21:42:58,456 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-12-17 21:42:58,456 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-12-17 21:42:58,456 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-12-17 21:42:58,456 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-12-17 21:42:58,456 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-12-17 21:42:58,456 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-12-17 21:42:58,456 INFO L138 SettingsManager]: * sizeof long double=12 [2021-12-17 21:42:58,457 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-12-17 21:42:58,458 INFO L138 SettingsManager]: * Use constant arrays=true [2021-12-17 21:42:58,458 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-12-17 21:42:58,461 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-12-17 21:42:58,462 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-12-17 21:42:58,462 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-12-17 21:42:58,463 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-17 21:42:58,463 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-12-17 21:42:58,463 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-12-17 21:42:58,463 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-12-17 21:42:58,463 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-12-17 21:42:58,464 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-12-17 21:42:58,464 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-12-17 21:42:58,464 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-12-17 21:42:58,464 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-12-17 21:42:58,465 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-12-17 21:42:58,465 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 98ed95c4a54f5ccebfa7d8542fee1c186675c886b13abb30be9edee4d8cb102c [2021-12-17 21:42:58,685 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-12-17 21:42:58,700 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-12-17 21:42:58,702 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-12-17 21:42:58,703 INFO L271 PluginConnector]: Initializing CDTParser... [2021-12-17 21:42:58,704 INFO L275 PluginConnector]: CDTParser initialized [2021-12-17 21:42:58,705 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/combinations/square_8+soft_float_3a.c.cil.c [2021-12-17 21:42:58,769 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/fb4028d43/6e3f4014d51440328af2defb4859b0ca/FLAG79cbc4ac8 [2021-12-17 21:42:59,126 INFO L306 CDTParser]: Found 1 translation units. [2021-12-17 21:42:59,126 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/combinations/square_8+soft_float_3a.c.cil.c [2021-12-17 21:42:59,132 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/fb4028d43/6e3f4014d51440328af2defb4859b0ca/FLAG79cbc4ac8 [2021-12-17 21:42:59,144 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/fb4028d43/6e3f4014d51440328af2defb4859b0ca [2021-12-17 21:42:59,146 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-12-17 21:42:59,147 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-12-17 21:42:59,148 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-12-17 21:42:59,148 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-12-17 21:42:59,151 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-12-17 21:42:59,151 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 17.12 09:42:59" (1/1) ... [2021-12-17 21:42:59,152 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1cbeb583 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.12 09:42:59, skipping insertion in model container [2021-12-17 21:42:59,152 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 17.12 09:42:59" (1/1) ... [2021-12-17 21:42:59,156 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-12-17 21:42:59,171 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-12-17 21:42:59,299 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/combinations/square_8+soft_float_3a.c.cil.c[1995,2008] [2021-12-17 21:42:59,303 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/combinations/square_8+soft_float_3a.c.cil.c[2364,2377] [2021-12-17 21:42:59,332 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-17 21:42:59,337 INFO L203 MainTranslator]: Completed pre-run [2021-12-17 21:42:59,348 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/combinations/square_8+soft_float_3a.c.cil.c[1995,2008] [2021-12-17 21:42:59,349 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/combinations/square_8+soft_float_3a.c.cil.c[2364,2377] [2021-12-17 21:42:59,364 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-17 21:42:59,373 INFO L208 MainTranslator]: Completed translation [2021-12-17 21:42:59,374 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.12 09:42:59 WrapperNode [2021-12-17 21:42:59,374 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-12-17 21:42:59,375 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-12-17 21:42:59,375 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-12-17 21:42:59,375 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-12-17 21:42:59,380 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.12 09:42:59" (1/1) ... [2021-12-17 21:42:59,386 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.12 09:42:59" (1/1) ... [2021-12-17 21:42:59,403 INFO L137 Inliner]: procedures = 27, calls = 17, calls flagged for inlining = 6, calls inlined = 6, statements flattened = 133 [2021-12-17 21:42:59,403 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-12-17 21:42:59,404 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-12-17 21:42:59,404 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-12-17 21:42:59,404 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-12-17 21:42:59,411 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.12 09:42:59" (1/1) ... [2021-12-17 21:42:59,411 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.12 09:42:59" (1/1) ... [2021-12-17 21:42:59,413 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.12 09:42:59" (1/1) ... [2021-12-17 21:42:59,413 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.12 09:42:59" (1/1) ... [2021-12-17 21:42:59,419 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.12 09:42:59" (1/1) ... [2021-12-17 21:42:59,422 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.12 09:42:59" (1/1) ... [2021-12-17 21:42:59,424 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.12 09:42:59" (1/1) ... [2021-12-17 21:42:59,425 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-12-17 21:42:59,435 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-12-17 21:42:59,436 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-12-17 21:42:59,436 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-12-17 21:42:59,437 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.12 09:42:59" (1/1) ... [2021-12-17 21:42:59,444 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-17 21:42:59,451 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-17 21:42:59,467 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) [2021-12-17 21:42:59,472 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 [2021-12-17 21:42:59,496 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-12-17 21:42:59,496 INFO L130 BoogieDeclarations]: Found specification of procedure base2flt [2021-12-17 21:42:59,496 INFO L138 BoogieDeclarations]: Found implementation of procedure base2flt [2021-12-17 21:42:59,500 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-12-17 21:42:59,500 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-12-17 21:42:59,500 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-12-17 21:42:59,500 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-12-17 21:42:59,501 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-12-17 21:42:59,550 INFO L236 CfgBuilder]: Building ICFG [2021-12-17 21:42:59,552 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-12-17 21:42:59,821 INFO L277 CfgBuilder]: Performing block encoding [2021-12-17 21:42:59,826 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-12-17 21:42:59,827 INFO L301 CfgBuilder]: Removed 2 assume(true) statements. [2021-12-17 21:42:59,828 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 17.12 09:42:59 BoogieIcfgContainer [2021-12-17 21:42:59,828 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-12-17 21:42:59,829 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-12-17 21:42:59,830 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-12-17 21:42:59,836 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-12-17 21:42:59,836 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 17.12 09:42:59" (1/3) ... [2021-12-17 21:42:59,837 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6a7da3ef and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 17.12 09:42:59, skipping insertion in model container [2021-12-17 21:42:59,837 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.12 09:42:59" (2/3) ... [2021-12-17 21:42:59,837 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6a7da3ef and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 17.12 09:42:59, skipping insertion in model container [2021-12-17 21:42:59,837 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 17.12 09:42:59" (3/3) ... [2021-12-17 21:42:59,838 INFO L111 eAbstractionObserver]: Analyzing ICFG square_8+soft_float_3a.c.cil.c [2021-12-17 21:42:59,842 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-12-17 21:42:59,842 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2021-12-17 21:42:59,874 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-12-17 21:42:59,878 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 [2021-12-17 21:42:59,878 INFO L340 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-12-17 21:42:59,890 INFO L276 IsEmpty]: Start isEmpty. Operand has 60 states, 50 states have (on average 1.56) internal successors, (78), 53 states have internal predecessors, (78), 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) [2021-12-17 21:42:59,893 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-12-17 21:42:59,893 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 21:42:59,893 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-12-17 21:42:59,894 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 21:42:59,897 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 21:42:59,898 INFO L85 PathProgramCache]: Analyzing trace with hash -548115930, now seen corresponding path program 1 times [2021-12-17 21:42:59,904 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-17 21:42:59,904 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1107181560] [2021-12-17 21:42:59,905 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 21:42:59,905 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-17 21:42:59,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 21:43:00,013 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-17 21:43:00,014 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-17 21:43:00,015 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1107181560] [2021-12-17 21:43:00,015 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1107181560] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-17 21:43:00,016 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-17 21:43:00,016 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-17 21:43:00,017 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [233696950] [2021-12-17 21:43:00,018 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-17 21:43:00,022 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-12-17 21:43:00,023 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-17 21:43:00,049 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-12-17 21:43:00,050 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-12-17 21:43:00,051 INFO L87 Difference]: Start difference. First operand has 60 states, 50 states have (on average 1.56) internal successors, (78), 53 states have internal predecessors, (78), 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 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 21:43:00,092 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-17 21:43:00,093 INFO L93 Difference]: Finished difference Result 115 states and 173 transitions. [2021-12-17 21:43:00,095 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-12-17 21:43:00,096 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2021-12-17 21:43:00,096 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-17 21:43:00,102 INFO L225 Difference]: With dead ends: 115 [2021-12-17 21:43:00,103 INFO L226 Difference]: Without dead ends: 51 [2021-12-17 21:43:00,106 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-12-17 21:43:00,109 INFO L933 BasicCegarLoop]: 81 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 0 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 81 SdHoareTripleChecker+Invalid, 0 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 0 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-17 21:43:00,110 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 81 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-17 21:43:00,122 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-12-17 21:43:00,147 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2021-12-17 21:43:00,148 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 43 states have (on average 1.4186046511627908) internal successors, (61), 44 states have internal predecessors, (61), 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) [2021-12-17 21:43:00,151 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 70 transitions. [2021-12-17 21:43:00,152 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 70 transitions. Word has length 7 [2021-12-17 21:43:00,153 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-17 21:43:00,153 INFO L470 AbstractCegarLoop]: Abstraction has 51 states and 70 transitions. [2021-12-17 21:43:00,153 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 21:43:00,153 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 70 transitions. [2021-12-17 21:43:00,154 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-12-17 21:43:00,154 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 21:43:00,154 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-12-17 21:43:00,155 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-12-17 21:43:00,155 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 21:43:00,157 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 21:43:00,158 INFO L85 PathProgramCache]: Analyzing trace with hash -548056348, now seen corresponding path program 1 times [2021-12-17 21:43:00,158 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-17 21:43:00,158 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [482947317] [2021-12-17 21:43:00,158 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 21:43:00,159 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-17 21:43:00,187 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-12-17 21:43:00,188 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-12-17 21:43:00,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-12-17 21:43:00,219 INFO L133 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-12-17 21:43:00,220 INFO L628 BasicCegarLoop]: Counterexample is feasible [2021-12-17 21:43:00,222 INFO L764 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION (1 of 2 remaining) [2021-12-17 21:43:00,223 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 2 remaining) [2021-12-17 21:43:00,223 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-12-17 21:43:00,226 INFO L732 BasicCegarLoop]: Path program histogram: [1, 1] [2021-12-17 21:43:00,228 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2021-12-17 21:43:00,247 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 17.12 09:43:00 BoogieIcfgContainer [2021-12-17 21:43:00,247 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-12-17 21:43:00,248 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-12-17 21:43:00,248 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-12-17 21:43:00,248 INFO L275 PluginConnector]: Witness Printer initialized [2021-12-17 21:43:00,249 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 17.12 09:42:59" (3/4) ... [2021-12-17 21:43:00,251 INFO L140 WitnessPrinter]: No result that supports witness generation found [2021-12-17 21:43:00,251 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-12-17 21:43:00,252 INFO L158 Benchmark]: Toolchain (without parser) took 1104.29ms. Allocated memory was 98.6MB in the beginning and 119.5MB in the end (delta: 21.0MB). Free memory was 71.2MB in the beginning and 83.3MB in the end (delta: -12.1MB). Peak memory consumption was 9.5MB. Max. memory is 16.1GB. [2021-12-17 21:43:00,253 INFO L158 Benchmark]: CDTParser took 0.20ms. Allocated memory is still 98.6MB. Free memory is still 55.4MB. There was no memory consumed. Max. memory is 16.1GB. [2021-12-17 21:43:00,254 INFO L158 Benchmark]: CACSL2BoogieTranslator took 226.05ms. Allocated memory was 98.6MB in the beginning and 119.5MB in the end (delta: 21.0MB). Free memory was 71.0MB in the beginning and 92.3MB in the end (delta: -21.3MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. [2021-12-17 21:43:00,255 INFO L158 Benchmark]: Boogie Procedure Inliner took 28.41ms. Allocated memory is still 119.5MB. Free memory was 92.3MB in the beginning and 90.3MB in the end (delta: 2.0MB). There was no memory consumed. Max. memory is 16.1GB. [2021-12-17 21:43:00,257 INFO L158 Benchmark]: Boogie Preprocessor took 21.76ms. Allocated memory is still 119.5MB. Free memory was 90.3MB in the beginning and 88.9MB in the end (delta: 1.4MB). Peak memory consumption was 4.2MB. Max. memory is 16.1GB. [2021-12-17 21:43:00,257 INFO L158 Benchmark]: RCFGBuilder took 393.44ms. Allocated memory is still 119.5MB. Free memory was 88.9MB in the beginning and 75.4MB in the end (delta: 13.5MB). Peak memory consumption was 12.6MB. Max. memory is 16.1GB. [2021-12-17 21:43:00,257 INFO L158 Benchmark]: TraceAbstraction took 417.63ms. Allocated memory is still 119.5MB. Free memory was 74.8MB in the beginning and 83.8MB in the end (delta: -9.1MB). There was no memory consumed. Max. memory is 16.1GB. [2021-12-17 21:43:00,257 INFO L158 Benchmark]: Witness Printer took 3.20ms. Allocated memory is still 119.5MB. Free memory was 83.8MB in the beginning and 83.3MB in the end (delta: 515.7kB). There was no memory consumed. Max. memory is 16.1GB. [2021-12-17 21:43:00,262 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.20ms. Allocated memory is still 98.6MB. Free memory is still 55.4MB. There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 226.05ms. Allocated memory was 98.6MB in the beginning and 119.5MB in the end (delta: 21.0MB). Free memory was 71.0MB in the beginning and 92.3MB in the end (delta: -21.3MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 28.41ms. Allocated memory is still 119.5MB. Free memory was 92.3MB in the beginning and 90.3MB in the end (delta: 2.0MB). There was no memory consumed. Max. memory is 16.1GB. * Boogie Preprocessor took 21.76ms. Allocated memory is still 119.5MB. Free memory was 90.3MB in the beginning and 88.9MB in the end (delta: 1.4MB). Peak memory consumption was 4.2MB. Max. memory is 16.1GB. * RCFGBuilder took 393.44ms. Allocated memory is still 119.5MB. Free memory was 88.9MB in the beginning and 75.4MB in the end (delta: 13.5MB). Peak memory consumption was 12.6MB. Max. memory is 16.1GB. * TraceAbstraction took 417.63ms. Allocated memory is still 119.5MB. Free memory was 74.8MB in the beginning and 83.8MB in the end (delta: -9.1MB). There was no memory consumed. Max. memory is 16.1GB. * Witness Printer took 3.20ms. Allocated memory is still 119.5MB. Free memory was 83.8MB in the beginning and 83.3MB in the end (delta: 515.7kB). There was no memory consumed. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0s ErrorAutomatonConstructionTimeTotal, 0.0s FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0s ErrorAutomatonConstructionTimeAvg, 0.0s ErrorAutomatonDifferenceTimeAvg, 0.0s ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - UnprovableResult [Line: 48]: Unable to prove that call to reach_error is unreachable Unable to prove that call to reach_error is unreachable Reason: overapproximation of someBinaryFLOATComparisonOperation at line 47, overapproximation of someBinaryArithmeticFLOAToperation at line 45. Possible FailurePath: [L320] COND TRUE __VERIFIER_nondet_int() [L321] CALL main1() [L39] float IN = __VERIFIER_nondet_float(); [L40] CALL assume_abort_if_not(IN >= 0.0f && IN < 1.0f) [L34] COND FALSE !(!cond) VAL [\old(cond)=1, cond=1] [L40] RET assume_abort_if_not(IN >= 0.0f && IN < 1.0f) [L42] float x = IN; [L44-L45] float result = 1.0f + 0.5f*x - 0.125f*x*x + 0.0625f*x*x*x - 0.0390625f*x*x*x*x; VAL [IN=49, x=49] [L47] COND TRUE !(result >= 0.0f && result < 1.5f) VAL [IN=49, x=49] [L48] reach_error() VAL [IN=49, x=49] - UnprovableResult [Line: 60]: Unable to prove that call to reach_error is unreachable Unable to prove that call to reach_error is unreachable Reason: Not analyzed. - StatisticsResult: Ultimate Automizer benchmark data CFG has 3 procedures, 60 locations, 2 error locations. Started 1 CEGAR loops. OverallTime: 0.4s, OverallIterations: 2, TraceHistogramMax: 1, PathProgramHistogramMax: 1, EmptinessCheckTime: 0.0s, AutomataDifference: 0.1s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, PartialOrderReductionTime: 0.0s, HoareTripleCheckerStatistics: 0 mSolverCounterUnknown, 0 SdHoareTripleChecker+Valid, 0.0s IncrementalHoareTripleChecker+Time, 0 mSdLazyCounter, 0 mSDsluCounter, 81 SdHoareTripleChecker+Invalid, 0.0s Time, 0 mProtectedAction, 0 SdHoareTripleChecker+Unchecked, 0 IncrementalHoareTripleChecker+Unchecked, 0 mSDsCounter, 0 IncrementalHoareTripleChecker+Valid, 0 mProtectedPredicate, 0 IncrementalHoareTripleChecker+Invalid, 0 SdHoareTripleChecker+Unknown, 0 mSolverCounterNotChecked, 0 mSolverCounterUnsat, 81 mSDtfsCounter, 0 mSolverCounterSat, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Unknown, PredicateUnifierStatistics: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=60occurred in iteration=0, InterpolantAutomatonStates: 2, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 1 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.0s SatisfiabilityAnalysisTime, 0.0s InterpolantComputationTime, 14 NumberOfCodeBlocks, 14 NumberOfCodeBlocksAsserted, 2 NumberOfCheckSat, 6 ConstructedInterpolants, 0 QuantifiedInterpolants, 6 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 1 InterpolantComputations, 1 PerfectInterpolantSequences, 0/0 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: unable to determine feasibility of some traces [2021-12-17 21:43:00,296 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request... --- End real Ultimate output --- Execution finished normally Using bit-precise analysis Retrying with bit-precise analysis ### Bit-precise run ### Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx15G -Xms4m -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/AutomizerReach.xml -i ../sv-benchmarks/c/combinations/square_8+soft_float_3a.c.cil.c -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 98ed95c4a54f5ccebfa7d8542fee1c186675c886b13abb30be9edee4d8cb102c --- Real Ultimate output --- This is Ultimate 0.2.2-tmp.no-commuhash-c3fed41 [2021-12-17 21:43:01,952 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-12-17 21:43:01,954 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-12-17 21:43:01,990 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-12-17 21:43:01,993 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-12-17 21:43:01,996 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-12-17 21:43:01,998 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-12-17 21:43:02,001 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-12-17 21:43:02,003 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-12-17 21:43:02,008 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-12-17 21:43:02,009 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-12-17 21:43:02,010 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-12-17 21:43:02,010 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-12-17 21:43:02,012 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-12-17 21:43:02,013 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-12-17 21:43:02,017 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-12-17 21:43:02,018 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-12-17 21:43:02,018 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-12-17 21:43:02,019 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-12-17 21:43:02,025 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-12-17 21:43:02,027 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-12-17 21:43:02,028 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-12-17 21:43:02,029 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-12-17 21:43:02,029 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-12-17 21:43:02,031 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-12-17 21:43:02,033 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-12-17 21:43:02,033 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-12-17 21:43:02,034 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-12-17 21:43:02,035 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-12-17 21:43:02,035 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-12-17 21:43:02,035 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-12-17 21:43:02,036 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-12-17 21:43:02,037 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-12-17 21:43:02,037 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-12-17 21:43:02,038 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-12-17 21:43:02,039 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-12-17 21:43:02,039 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-12-17 21:43:02,039 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-12-17 21:43:02,039 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-12-17 21:43:02,041 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-12-17 21:43:02,041 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-12-17 21:43:02,042 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Bitvector.epf [2021-12-17 21:43:02,069 INFO L113 SettingsManager]: Loading preferences was successful [2021-12-17 21:43:02,069 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-12-17 21:43:02,070 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-12-17 21:43:02,070 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-12-17 21:43:02,071 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-12-17 21:43:02,071 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-12-17 21:43:02,072 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-12-17 21:43:02,072 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-12-17 21:43:02,072 INFO L138 SettingsManager]: * Use SBE=true [2021-12-17 21:43:02,072 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-12-17 21:43:02,073 INFO L138 SettingsManager]: * sizeof long=4 [2021-12-17 21:43:02,073 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-12-17 21:43:02,073 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-12-17 21:43:02,074 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-12-17 21:43:02,074 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-12-17 21:43:02,074 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-12-17 21:43:02,074 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-12-17 21:43:02,074 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-12-17 21:43:02,074 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-12-17 21:43:02,074 INFO L138 SettingsManager]: * sizeof long double=12 [2021-12-17 21:43:02,075 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-12-17 21:43:02,075 INFO L138 SettingsManager]: * Use constant arrays=true [2021-12-17 21:43:02,075 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-12-17 21:43:02,075 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-12-17 21:43:02,075 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-12-17 21:43:02,075 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-12-17 21:43:02,075 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-17 21:43:02,076 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-12-17 21:43:02,076 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-12-17 21:43:02,076 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-12-17 21:43:02,076 INFO L138 SettingsManager]: * Trace refinement strategy=WOLF [2021-12-17 21:43:02,076 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-12-17 21:43:02,076 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-12-17 21:43:02,077 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-12-17 21:43:02,077 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-12-17 21:43:02,077 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-12-17 21:43:02,077 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-12-17 21:43:02,077 INFO L138 SettingsManager]: * Logic for external solver=AUFBV WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 98ed95c4a54f5ccebfa7d8542fee1c186675c886b13abb30be9edee4d8cb102c [2021-12-17 21:43:02,361 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-12-17 21:43:02,375 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-12-17 21:43:02,377 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-12-17 21:43:02,378 INFO L271 PluginConnector]: Initializing CDTParser... [2021-12-17 21:43:02,379 INFO L275 PluginConnector]: CDTParser initialized [2021-12-17 21:43:02,380 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/combinations/square_8+soft_float_3a.c.cil.c [2021-12-17 21:43:02,439 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2cddb9bd8/557138e5668e4cd18c1e8bc7b32743f7/FLAG8a16d6411 [2021-12-17 21:43:02,818 INFO L306 CDTParser]: Found 1 translation units. [2021-12-17 21:43:02,822 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/combinations/square_8+soft_float_3a.c.cil.c [2021-12-17 21:43:02,833 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2cddb9bd8/557138e5668e4cd18c1e8bc7b32743f7/FLAG8a16d6411 [2021-12-17 21:43:02,845 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2cddb9bd8/557138e5668e4cd18c1e8bc7b32743f7 [2021-12-17 21:43:02,849 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-12-17 21:43:02,851 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-12-17 21:43:02,852 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-12-17 21:43:02,852 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-12-17 21:43:02,854 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-12-17 21:43:02,855 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 17.12 09:43:02" (1/1) ... [2021-12-17 21:43:02,856 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@30f633b8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.12 09:43:02, skipping insertion in model container [2021-12-17 21:43:02,857 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 17.12 09:43:02" (1/1) ... [2021-12-17 21:43:02,862 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-12-17 21:43:02,891 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-12-17 21:43:03,038 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/combinations/square_8+soft_float_3a.c.cil.c[1995,2008] [2021-12-17 21:43:03,044 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/combinations/square_8+soft_float_3a.c.cil.c[2364,2377] [2021-12-17 21:43:03,126 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-17 21:43:03,140 INFO L203 MainTranslator]: Completed pre-run [2021-12-17 21:43:03,155 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/combinations/square_8+soft_float_3a.c.cil.c[1995,2008] [2021-12-17 21:43:03,157 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/combinations/square_8+soft_float_3a.c.cil.c[2364,2377] [2021-12-17 21:43:03,183 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-17 21:43:03,198 INFO L208 MainTranslator]: Completed translation [2021-12-17 21:43:03,199 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.12 09:43:03 WrapperNode [2021-12-17 21:43:03,199 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-12-17 21:43:03,201 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-12-17 21:43:03,201 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-12-17 21:43:03,201 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-12-17 21:43:03,206 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.12 09:43:03" (1/1) ... [2021-12-17 21:43:03,214 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.12 09:43:03" (1/1) ... [2021-12-17 21:43:03,229 INFO L137 Inliner]: procedures = 28, calls = 17, calls flagged for inlining = 6, calls inlined = 6, statements flattened = 129 [2021-12-17 21:43:03,231 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-12-17 21:43:03,233 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-12-17 21:43:03,233 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-12-17 21:43:03,233 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-12-17 21:43:03,239 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.12 09:43:03" (1/1) ... [2021-12-17 21:43:03,239 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.12 09:43:03" (1/1) ... [2021-12-17 21:43:03,254 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.12 09:43:03" (1/1) ... [2021-12-17 21:43:03,257 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.12 09:43:03" (1/1) ... [2021-12-17 21:43:03,275 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.12 09:43:03" (1/1) ... [2021-12-17 21:43:03,278 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.12 09:43:03" (1/1) ... [2021-12-17 21:43:03,281 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.12 09:43:03" (1/1) ... [2021-12-17 21:43:03,288 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-12-17 21:43:03,289 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-12-17 21:43:03,289 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-12-17 21:43:03,289 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-12-17 21:43:03,290 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.12 09:43:03" (1/1) ... [2021-12-17 21:43:03,294 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-17 21:43:03,301 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-17 21:43:03,309 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) [2021-12-17 21:43:03,335 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 [2021-12-17 21:43:03,358 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-12-17 21:43:03,358 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-12-17 21:43:03,359 INFO L130 BoogieDeclarations]: Found specification of procedure base2flt [2021-12-17 21:43:03,359 INFO L138 BoogieDeclarations]: Found implementation of procedure base2flt [2021-12-17 21:43:03,359 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-12-17 21:43:03,359 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-12-17 21:43:03,359 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-12-17 21:43:03,359 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-12-17 21:43:03,410 INFO L236 CfgBuilder]: Building ICFG [2021-12-17 21:43:03,412 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-12-17 21:43:05,862 INFO L277 CfgBuilder]: Performing block encoding [2021-12-17 21:43:05,867 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-12-17 21:43:05,868 INFO L301 CfgBuilder]: Removed 2 assume(true) statements. [2021-12-17 21:43:05,869 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 17.12 09:43:05 BoogieIcfgContainer [2021-12-17 21:43:05,869 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-12-17 21:43:05,870 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-12-17 21:43:05,871 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-12-17 21:43:05,872 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-12-17 21:43:05,873 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 17.12 09:43:02" (1/3) ... [2021-12-17 21:43:05,873 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@27557a4d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 17.12 09:43:05, skipping insertion in model container [2021-12-17 21:43:05,873 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.12 09:43:03" (2/3) ... [2021-12-17 21:43:05,874 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@27557a4d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 17.12 09:43:05, skipping insertion in model container [2021-12-17 21:43:05,874 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 17.12 09:43:05" (3/3) ... [2021-12-17 21:43:05,875 INFO L111 eAbstractionObserver]: Analyzing ICFG square_8+soft_float_3a.c.cil.c [2021-12-17 21:43:05,878 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-12-17 21:43:05,878 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2021-12-17 21:43:05,908 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-12-17 21:43:05,912 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 [2021-12-17 21:43:05,912 INFO L340 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-12-17 21:43:05,922 INFO L276 IsEmpty]: Start isEmpty. Operand has 60 states, 50 states have (on average 1.56) internal successors, (78), 53 states have internal predecessors, (78), 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) [2021-12-17 21:43:05,925 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-12-17 21:43:05,925 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 21:43:05,926 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-12-17 21:43:05,926 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 21:43:05,929 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 21:43:05,930 INFO L85 PathProgramCache]: Analyzing trace with hash -548115930, now seen corresponding path program 1 times [2021-12-17 21:43:05,937 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-17 21:43:05,937 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [305213301] [2021-12-17 21:43:05,938 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 21:43:05,938 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-17 21:43:05,938 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-17 21:43:05,940 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-17 21:43:05,947 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-12-17 21:43:06,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 21:43:06,332 INFO L263 TraceCheckSpWp]: Trace formula consists of 22 conjuncts, 1 conjunts are in the unsatisfiable core [2021-12-17 21:43:06,335 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-17 21:43:06,376 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-17 21:43:06,376 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-17 21:43:06,377 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-17 21:43:06,377 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [305213301] [2021-12-17 21:43:06,377 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [305213301] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-17 21:43:06,378 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-17 21:43:06,378 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-17 21:43:06,379 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2095164291] [2021-12-17 21:43:06,380 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-17 21:43:06,382 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-12-17 21:43:06,382 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-17 21:43:06,398 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-12-17 21:43:06,398 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-12-17 21:43:06,400 INFO L87 Difference]: Start difference. First operand has 60 states, 50 states have (on average 1.56) internal successors, (78), 53 states have internal predecessors, (78), 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 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 21:43:06,416 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-17 21:43:06,417 INFO L93 Difference]: Finished difference Result 115 states and 173 transitions. [2021-12-17 21:43:06,418 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-12-17 21:43:06,418 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2021-12-17 21:43:06,419 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-17 21:43:06,423 INFO L225 Difference]: With dead ends: 115 [2021-12-17 21:43:06,424 INFO L226 Difference]: Without dead ends: 51 [2021-12-17 21:43:06,427 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-12-17 21:43:06,431 INFO L933 BasicCegarLoop]: 81 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 0 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 81 SdHoareTripleChecker+Invalid, 0 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 0 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-17 21:43:06,433 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 81 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-17 21:43:06,445 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-12-17 21:43:06,467 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2021-12-17 21:43:06,468 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 43 states have (on average 1.4186046511627908) internal successors, (61), 44 states have internal predecessors, (61), 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) [2021-12-17 21:43:06,471 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 70 transitions. [2021-12-17 21:43:06,472 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 70 transitions. Word has length 7 [2021-12-17 21:43:06,472 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-17 21:43:06,472 INFO L470 AbstractCegarLoop]: Abstraction has 51 states and 70 transitions. [2021-12-17 21:43:06,473 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 21:43:06,473 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 70 transitions. [2021-12-17 21:43:06,474 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-12-17 21:43:06,474 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 21:43:06,474 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-12-17 21:43:06,492 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (2)] Ended with exit code 0 [2021-12-17 21:43:06,690 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-17 21:43:06,690 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 21:43:06,691 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 21:43:06,691 INFO L85 PathProgramCache]: Analyzing trace with hash -548056348, now seen corresponding path program 1 times [2021-12-17 21:43:06,691 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-17 21:43:06,691 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [435457543] [2021-12-17 21:43:06,691 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 21:43:06,692 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-17 21:43:06,692 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-17 21:43:06,695 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-17 21:43:06,736 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-12-17 21:43:46,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 21:43:46,758 INFO L263 TraceCheckSpWp]: Trace formula consists of 22 conjuncts, 7 conjunts are in the unsatisfiable core [2021-12-17 21:43:46,759 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-17 21:44:01,837 WARN L838 $PredicateComparison]: unable to prove that (and (= c_currentRoundingMode roundNearestTiesToEven) (exists ((|ULTIMATE.start_main1_~IN~0#1| (_ FloatingPoint 8 24))) (let ((.cse0 ((_ to_fp 8 24) c_currentRoundingMode 1.0))) (and (= |c_ULTIMATE.start_main1_~result~0#1| (fp.sub c_currentRoundingMode (fp.add c_currentRoundingMode (fp.sub c_currentRoundingMode (fp.add c_currentRoundingMode .cse0 (fp.mul c_currentRoundingMode ((_ to_fp 8 24) c_currentRoundingMode (/ 1.0 2.0)) |ULTIMATE.start_main1_~IN~0#1|)) (fp.mul c_currentRoundingMode (fp.mul c_currentRoundingMode ((_ to_fp 8 24) c_currentRoundingMode (/ 1.0 8.0)) |ULTIMATE.start_main1_~IN~0#1|) |ULTIMATE.start_main1_~IN~0#1|)) (fp.mul c_currentRoundingMode (fp.mul c_currentRoundingMode (fp.mul c_currentRoundingMode ((_ to_fp 8 24) c_currentRoundingMode (/ 1.0 16.0)) |ULTIMATE.start_main1_~IN~0#1|) |ULTIMATE.start_main1_~IN~0#1|) |ULTIMATE.start_main1_~IN~0#1|)) (fp.mul c_currentRoundingMode (fp.mul c_currentRoundingMode (fp.mul c_currentRoundingMode (fp.mul c_currentRoundingMode ((_ to_fp 8 24) c_currentRoundingMode (/ 5.0 128.0)) |ULTIMATE.start_main1_~IN~0#1|) |ULTIMATE.start_main1_~IN~0#1|) |ULTIMATE.start_main1_~IN~0#1|) |ULTIMATE.start_main1_~IN~0#1|))) (fp.lt |ULTIMATE.start_main1_~IN~0#1| .cse0) (fp.geq |ULTIMATE.start_main1_~IN~0#1| (_ +zero 8 24)))))) is different from false [2021-12-17 21:44:52,447 WARN L838 $PredicateComparison]: unable to prove that (exists ((|ULTIMATE.start_main1_~IN~0#1| (_ FloatingPoint 8 24))) (let ((.cse1 ((_ to_fp 8 24) roundNearestTiesToEven 1.0))) (and (let ((.cse0 (fp.sub roundNearestTiesToEven (fp.add roundNearestTiesToEven (fp.sub roundNearestTiesToEven (fp.add roundNearestTiesToEven .cse1 (fp.mul roundNearestTiesToEven ((_ to_fp 8 24) roundNearestTiesToEven (/ 1.0 2.0)) |ULTIMATE.start_main1_~IN~0#1|)) (fp.mul roundNearestTiesToEven (fp.mul roundNearestTiesToEven ((_ to_fp 8 24) roundNearestTiesToEven (/ 1.0 8.0)) |ULTIMATE.start_main1_~IN~0#1|) |ULTIMATE.start_main1_~IN~0#1|)) (fp.mul roundNearestTiesToEven (fp.mul roundNearestTiesToEven (fp.mul roundNearestTiesToEven ((_ to_fp 8 24) roundNearestTiesToEven (/ 1.0 16.0)) |ULTIMATE.start_main1_~IN~0#1|) |ULTIMATE.start_main1_~IN~0#1|) |ULTIMATE.start_main1_~IN~0#1|)) (fp.mul roundNearestTiesToEven (fp.mul roundNearestTiesToEven (fp.mul roundNearestTiesToEven (fp.mul roundNearestTiesToEven ((_ to_fp 8 24) roundNearestTiesToEven (/ 5.0 128.0)) |ULTIMATE.start_main1_~IN~0#1|) |ULTIMATE.start_main1_~IN~0#1|) |ULTIMATE.start_main1_~IN~0#1|) |ULTIMATE.start_main1_~IN~0#1|)))) (or (not (fp.geq .cse0 (_ +zero 8 24))) (not (fp.lt .cse0 ((_ to_fp 8 24) roundNearestTiesToEven (/ 3.0 2.0)))))) (fp.lt |ULTIMATE.start_main1_~IN~0#1| .cse1) (fp.geq |ULTIMATE.start_main1_~IN~0#1| (_ +zero 8 24))))) is different from false [2021-12-17 21:44:54,501 WARN L860 $PredicateComparison]: unable to prove that (exists ((|ULTIMATE.start_main1_~IN~0#1| (_ FloatingPoint 8 24))) (let ((.cse1 ((_ to_fp 8 24) roundNearestTiesToEven 1.0))) (and (let ((.cse0 (fp.sub roundNearestTiesToEven (fp.add roundNearestTiesToEven (fp.sub roundNearestTiesToEven (fp.add roundNearestTiesToEven .cse1 (fp.mul roundNearestTiesToEven ((_ to_fp 8 24) roundNearestTiesToEven (/ 1.0 2.0)) |ULTIMATE.start_main1_~IN~0#1|)) (fp.mul roundNearestTiesToEven (fp.mul roundNearestTiesToEven ((_ to_fp 8 24) roundNearestTiesToEven (/ 1.0 8.0)) |ULTIMATE.start_main1_~IN~0#1|) |ULTIMATE.start_main1_~IN~0#1|)) (fp.mul roundNearestTiesToEven (fp.mul roundNearestTiesToEven (fp.mul roundNearestTiesToEven ((_ to_fp 8 24) roundNearestTiesToEven (/ 1.0 16.0)) |ULTIMATE.start_main1_~IN~0#1|) |ULTIMATE.start_main1_~IN~0#1|) |ULTIMATE.start_main1_~IN~0#1|)) (fp.mul roundNearestTiesToEven (fp.mul roundNearestTiesToEven (fp.mul roundNearestTiesToEven (fp.mul roundNearestTiesToEven ((_ to_fp 8 24) roundNearestTiesToEven (/ 5.0 128.0)) |ULTIMATE.start_main1_~IN~0#1|) |ULTIMATE.start_main1_~IN~0#1|) |ULTIMATE.start_main1_~IN~0#1|) |ULTIMATE.start_main1_~IN~0#1|)))) (or (not (fp.geq .cse0 (_ +zero 8 24))) (not (fp.lt .cse0 ((_ to_fp 8 24) roundNearestTiesToEven (/ 3.0 2.0)))))) (fp.lt |ULTIMATE.start_main1_~IN~0#1| .cse1) (fp.geq |ULTIMATE.start_main1_~IN~0#1| (_ +zero 8 24))))) is different from true [2021-12-17 21:44:54,502 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-17 21:44:54,502 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-17 21:44:54,502 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-17 21:44:54,502 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [435457543] [2021-12-17 21:44:54,502 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [435457543] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-17 21:44:54,502 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-17 21:44:54,502 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-12-17 21:44:54,502 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1337305827] [2021-12-17 21:44:54,502 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-17 21:44:54,503 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-12-17 21:44:54,503 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-17 21:44:54,504 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-12-17 21:44:54,504 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=12, Unknown=3, NotChecked=14, Total=42 [2021-12-17 21:44:54,504 INFO L87 Difference]: Start difference. First operand 51 states and 70 transitions. Second operand has 7 states, 6 states have (on average 1.1666666666666667) internal successors, (7), 6 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 21:44:56,888 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.19s for a HTC check with result UNKNOWN. Formula has sorts [Bool, FloatingPoint, RoundingMode, Real, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-12-17 21:44:57,069 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-17 21:44:57,069 INFO L93 Difference]: Finished difference Result 51 states and 70 transitions. [2021-12-17 21:44:57,070 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-12-17 21:44:57,070 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 1.1666666666666667) internal successors, (7), 6 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2021-12-17 21:44:57,070 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-17 21:44:57,070 INFO L225 Difference]: With dead ends: 51 [2021-12-17 21:44:57,071 INFO L226 Difference]: Without dead ends: 46 [2021-12-17 21:44:57,071 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 2 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 6.6s TimeCoverageRelationStatistics Valid=18, Invalid=17, Unknown=3, NotChecked=18, Total=56 [2021-12-17 21:44:57,072 INFO L933 BasicCegarLoop]: 65 mSDtfsCounter, 65 mSDsluCounter, 110 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 0 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 175 SdHoareTripleChecker+Invalid, 159 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 135 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-12-17 21:44:57,072 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [65 Valid, 175 Invalid, 159 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 23 Invalid, 1 Unknown, 135 Unchecked, 2.4s Time] [2021-12-17 21:44:57,073 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2021-12-17 21:44:57,075 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2021-12-17 21:44:57,075 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 39 states have (on average 1.435897435897436) internal successors, (56), 39 states have internal predecessors, (56), 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) [2021-12-17 21:44:57,076 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 65 transitions. [2021-12-17 21:44:57,076 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 65 transitions. Word has length 7 [2021-12-17 21:44:57,077 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-17 21:44:57,077 INFO L470 AbstractCegarLoop]: Abstraction has 46 states and 65 transitions. [2021-12-17 21:44:57,082 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 1.1666666666666667) internal successors, (7), 6 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 21:44:57,082 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 65 transitions. [2021-12-17 21:44:57,083 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-12-17 21:44:57,083 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 21:44:57,084 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 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] [2021-12-17 21:44:57,105 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-12-17 21:44:57,293 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-17 21:44:57,294 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 21:44:57,294 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 21:44:57,294 INFO L85 PathProgramCache]: Analyzing trace with hash 220430878, now seen corresponding path program 1 times [2021-12-17 21:44:57,295 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-17 21:44:57,295 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2022518656] [2021-12-17 21:44:57,295 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 21:44:57,295 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-17 21:44:57,296 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-17 21:44:57,297 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-17 21:44:57,298 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-12-17 21:44:57,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 21:44:57,383 INFO L263 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 3 conjunts are in the unsatisfiable core [2021-12-17 21:44:57,385 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-17 21:44:57,647 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 24 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-12-17 21:44:57,647 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-17 21:44:57,647 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-17 21:44:57,647 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2022518656] [2021-12-17 21:44:57,647 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2022518656] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-17 21:44:57,647 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-17 21:44:57,647 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-12-17 21:44:57,648 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2104052219] [2021-12-17 21:44:57,648 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-17 21:44:57,648 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-12-17 21:44:57,648 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-17 21:44:57,649 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-12-17 21:44:57,649 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-12-17 21:44:57,649 INFO L87 Difference]: Start difference. First operand 46 states and 65 transitions. Second operand has 4 states, 4 states have (on average 7.25) internal successors, (29), 4 states have internal predecessors, (29), 2 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-12-17 21:44:57,923 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-17 21:44:57,924 INFO L93 Difference]: Finished difference Result 102 states and 148 transitions. [2021-12-17 21:44:57,924 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-12-17 21:44:57,924 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 7.25) internal successors, (29), 4 states have internal predecessors, (29), 2 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 42 [2021-12-17 21:44:57,925 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-17 21:44:57,926 INFO L225 Difference]: With dead ends: 102 [2021-12-17 21:44:57,926 INFO L226 Difference]: Without dead ends: 60 [2021-12-17 21:44:57,927 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-12-17 21:44:57,927 INFO L933 BasicCegarLoop]: 51 mSDtfsCounter, 16 mSDsluCounter, 92 mSDsCounter, 0 mSdLazyCounter, 45 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 143 SdHoareTripleChecker+Invalid, 47 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 45 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-17 21:44:57,928 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 143 Invalid, 47 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 45 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-17 21:44:57,928 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-12-17 21:44:57,936 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 51. [2021-12-17 21:44:57,936 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 43 states have (on average 1.3953488372093024) internal successors, (60), 43 states have internal predecessors, (60), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-12-17 21:44:57,936 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 71 transitions. [2021-12-17 21:44:57,937 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 71 transitions. Word has length 42 [2021-12-17 21:44:57,937 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-17 21:44:57,937 INFO L470 AbstractCegarLoop]: Abstraction has 51 states and 71 transitions. [2021-12-17 21:44:57,937 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 7.25) internal successors, (29), 4 states have internal predecessors, (29), 2 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-12-17 21:44:57,937 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 71 transitions. [2021-12-17 21:44:57,938 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-12-17 21:44:57,938 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 21:44:57,938 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 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] [2021-12-17 21:44:57,946 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-12-17 21:44:58,146 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-17 21:44:58,146 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 21:44:58,147 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 21:44:58,147 INFO L85 PathProgramCache]: Analyzing trace with hash -1744233432, now seen corresponding path program 1 times [2021-12-17 21:44:58,147 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-17 21:44:58,147 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1090791208] [2021-12-17 21:44:58,147 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 21:44:58,147 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-17 21:44:58,147 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-17 21:44:58,148 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-17 21:44:58,157 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-12-17 21:44:58,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 21:44:58,192 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 3 conjunts are in the unsatisfiable core [2021-12-17 21:44:58,197 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-17 21:44:58,504 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 24 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-12-17 21:44:58,504 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-17 21:44:58,504 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-17 21:44:58,504 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1090791208] [2021-12-17 21:44:58,504 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1090791208] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-17 21:44:58,504 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-17 21:44:58,504 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-12-17 21:44:58,504 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [219186935] [2021-12-17 21:44:58,504 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-17 21:44:58,505 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-12-17 21:44:58,505 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-17 21:44:58,505 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-12-17 21:44:58,505 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-12-17 21:44:58,505 INFO L87 Difference]: Start difference. First operand 51 states and 71 transitions. Second operand has 4 states, 4 states have (on average 8.0) internal successors, (32), 4 states have internal predecessors, (32), 2 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-12-17 21:44:58,784 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-17 21:44:58,784 INFO L93 Difference]: Finished difference Result 106 states and 151 transitions. [2021-12-17 21:44:58,785 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-12-17 21:44:58,785 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 8.0) internal successors, (32), 4 states have internal predecessors, (32), 2 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 45 [2021-12-17 21:44:58,785 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-17 21:44:58,786 INFO L225 Difference]: With dead ends: 106 [2021-12-17 21:44:58,786 INFO L226 Difference]: Without dead ends: 63 [2021-12-17 21:44:58,787 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-12-17 21:44:58,787 INFO L933 BasicCegarLoop]: 58 mSDtfsCounter, 10 mSDsluCounter, 99 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 157 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-17 21:44:58,787 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 157 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-17 21:44:58,788 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-12-17 21:44:58,792 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 56. [2021-12-17 21:44:58,792 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 47 states have (on average 1.3829787234042554) internal successors, (65), 48 states have internal predecessors, (65), 5 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-12-17 21:44:58,793 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 78 transitions. [2021-12-17 21:44:58,793 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 78 transitions. Word has length 45 [2021-12-17 21:44:58,793 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-17 21:44:58,793 INFO L470 AbstractCegarLoop]: Abstraction has 56 states and 78 transitions. [2021-12-17 21:44:58,794 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 8.0) internal successors, (32), 4 states have internal predecessors, (32), 2 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-12-17 21:44:58,794 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 78 transitions. [2021-12-17 21:44:58,794 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-12-17 21:44:58,795 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 21:44:58,795 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 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] [2021-12-17 21:44:58,802 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (5)] Ended with exit code 0 [2021-12-17 21:44:58,995 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-17 21:44:58,996 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 21:44:58,997 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 21:44:58,998 INFO L85 PathProgramCache]: Analyzing trace with hash -1089123319, now seen corresponding path program 1 times [2021-12-17 21:44:58,999 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-17 21:44:58,999 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1585582012] [2021-12-17 21:44:58,999 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 21:44:58,999 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-17 21:44:59,001 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-17 21:44:59,003 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-17 21:44:59,007 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-12-17 21:44:59,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 21:44:59,068 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 3 conjunts are in the unsatisfiable core [2021-12-17 21:44:59,069 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-17 21:44:59,363 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 24 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-12-17 21:44:59,363 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-17 21:44:59,363 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-17 21:44:59,363 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1585582012] [2021-12-17 21:44:59,363 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1585582012] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-17 21:44:59,363 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-17 21:44:59,364 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-12-17 21:44:59,364 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1663991017] [2021-12-17 21:44:59,364 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-17 21:44:59,364 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-12-17 21:44:59,364 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-17 21:44:59,364 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-12-17 21:44:59,364 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-12-17 21:44:59,365 INFO L87 Difference]: Start difference. First operand 56 states and 78 transitions. Second operand has 4 states, 4 states have (on average 8.25) internal successors, (33), 4 states have internal predecessors, (33), 2 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-12-17 21:44:59,663 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-17 21:44:59,663 INFO L93 Difference]: Finished difference Result 115 states and 163 transitions. [2021-12-17 21:44:59,664 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-12-17 21:44:59,664 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 8.25) internal successors, (33), 4 states have internal predecessors, (33), 2 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 46 [2021-12-17 21:44:59,664 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-17 21:44:59,665 INFO L225 Difference]: With dead ends: 115 [2021-12-17 21:44:59,665 INFO L226 Difference]: Without dead ends: 67 [2021-12-17 21:44:59,665 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-12-17 21:44:59,666 INFO L933 BasicCegarLoop]: 57 mSDtfsCounter, 16 mSDsluCounter, 93 mSDsCounter, 0 mSdLazyCounter, 50 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 150 SdHoareTripleChecker+Invalid, 51 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 50 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-17 21:44:59,666 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 150 Invalid, 51 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 50 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-17 21:44:59,666 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2021-12-17 21:44:59,671 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 57. [2021-12-17 21:44:59,671 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 48 states have (on average 1.375) internal successors, (66), 49 states have internal predecessors, (66), 5 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-12-17 21:44:59,672 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 79 transitions. [2021-12-17 21:44:59,672 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 79 transitions. Word has length 46 [2021-12-17 21:44:59,672 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-17 21:44:59,672 INFO L470 AbstractCegarLoop]: Abstraction has 57 states and 79 transitions. [2021-12-17 21:44:59,672 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 8.25) internal successors, (33), 4 states have internal predecessors, (33), 2 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-12-17 21:44:59,672 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 79 transitions. [2021-12-17 21:44:59,673 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-12-17 21:44:59,673 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 21:44:59,673 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 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] [2021-12-17 21:44:59,684 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2021-12-17 21:44:59,873 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-17 21:44:59,874 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 21:44:59,875 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 21:44:59,875 INFO L85 PathProgramCache]: Analyzing trace with hash 957340839, now seen corresponding path program 1 times [2021-12-17 21:44:59,875 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-17 21:44:59,875 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [254838700] [2021-12-17 21:44:59,875 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 21:44:59,875 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-17 21:44:59,876 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-17 21:44:59,876 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-17 21:44:59,878 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2021-12-17 21:44:59,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 21:44:59,914 INFO L263 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 4 conjunts are in the unsatisfiable core [2021-12-17 21:44:59,915 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-17 21:45:00,246 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 24 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-12-17 21:45:00,247 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-17 21:45:00,247 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-17 21:45:00,247 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [254838700] [2021-12-17 21:45:00,247 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [254838700] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-17 21:45:00,247 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-17 21:45:00,247 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-12-17 21:45:00,247 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [652826064] [2021-12-17 21:45:00,247 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-17 21:45:00,248 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-12-17 21:45:00,248 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-17 21:45:00,248 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-12-17 21:45:00,248 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-12-17 21:45:00,249 INFO L87 Difference]: Start difference. First operand 57 states and 79 transitions. Second operand has 5 states, 5 states have (on average 6.8) internal successors, (34), 5 states have internal predecessors, (34), 2 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-12-17 21:45:00,727 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-17 21:45:00,727 INFO L93 Difference]: Finished difference Result 123 states and 174 transitions. [2021-12-17 21:45:00,728 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-12-17 21:45:00,728 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 6.8) internal successors, (34), 5 states have internal predecessors, (34), 2 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 47 [2021-12-17 21:45:00,728 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-17 21:45:00,729 INFO L225 Difference]: With dead ends: 123 [2021-12-17 21:45:00,729 INFO L226 Difference]: Without dead ends: 74 [2021-12-17 21:45:00,730 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-12-17 21:45:00,730 INFO L933 BasicCegarLoop]: 54 mSDtfsCounter, 19 mSDsluCounter, 144 mSDsCounter, 0 mSdLazyCounter, 82 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 198 SdHoareTripleChecker+Invalid, 83 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 82 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-12-17 21:45:00,730 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 198 Invalid, 83 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 82 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-12-17 21:45:00,731 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2021-12-17 21:45:00,735 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 58. [2021-12-17 21:45:00,735 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 49 states have (on average 1.3877551020408163) internal successors, (68), 50 states have internal predecessors, (68), 5 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-12-17 21:45:00,736 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 81 transitions. [2021-12-17 21:45:00,740 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 81 transitions. Word has length 47 [2021-12-17 21:45:00,740 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-17 21:45:00,741 INFO L470 AbstractCegarLoop]: Abstraction has 58 states and 81 transitions. [2021-12-17 21:45:00,742 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 6.8) internal successors, (34), 5 states have internal predecessors, (34), 2 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-12-17 21:45:00,742 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 81 transitions. [2021-12-17 21:45:00,743 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-12-17 21:45:00,744 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 21:45:00,744 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 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] [2021-12-17 21:45:00,752 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (7)] Forceful destruction successful, exit code 0 [2021-12-17 21:45:00,949 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-17 21:45:00,949 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 21:45:00,950 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 21:45:00,950 INFO L85 PathProgramCache]: Analyzing trace with hash -1066513524, now seen corresponding path program 1 times [2021-12-17 21:45:00,950 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-17 21:45:00,950 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [275912317] [2021-12-17 21:45:00,950 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 21:45:00,950 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-17 21:45:00,951 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-17 21:45:00,951 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-17 21:45:00,953 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2021-12-17 21:45:00,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 21:45:00,986 INFO L263 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 4 conjunts are in the unsatisfiable core [2021-12-17 21:45:00,987 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-17 21:45:01,325 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 24 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-12-17 21:45:01,325 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-17 21:45:01,917 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 4 proven. 10 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-12-17 21:45:01,917 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-17 21:45:01,917 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [275912317] [2021-12-17 21:45:01,917 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [275912317] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-17 21:45:01,917 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-17 21:45:01,917 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 8 [2021-12-17 21:45:01,918 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2066792857] [2021-12-17 21:45:01,918 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-17 21:45:01,918 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-12-17 21:45:01,918 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-17 21:45:01,919 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-12-17 21:45:01,919 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-12-17 21:45:01,919 INFO L87 Difference]: Start difference. First operand 58 states and 81 transitions. Second operand has 8 states, 8 states have (on average 5.625) internal successors, (45), 8 states have internal predecessors, (45), 2 states have call successors, (7), 2 states have call predecessors, (7), 4 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-12-17 21:45:02,748 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-17 21:45:02,749 INFO L93 Difference]: Finished difference Result 144 states and 206 transitions. [2021-12-17 21:45:02,749 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-12-17 21:45:02,750 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 5.625) internal successors, (45), 8 states have internal predecessors, (45), 2 states have call successors, (7), 2 states have call predecessors, (7), 4 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 48 [2021-12-17 21:45:02,750 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-17 21:45:02,751 INFO L225 Difference]: With dead ends: 144 [2021-12-17 21:45:02,751 INFO L226 Difference]: Without dead ends: 94 [2021-12-17 21:45:02,751 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 91 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=45, Invalid=65, Unknown=0, NotChecked=0, Total=110 [2021-12-17 21:45:02,752 INFO L933 BasicCegarLoop]: 63 mSDtfsCounter, 52 mSDsluCounter, 222 mSDsCounter, 0 mSdLazyCounter, 107 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 285 SdHoareTripleChecker+Invalid, 116 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 107 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-12-17 21:45:02,752 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [52 Valid, 285 Invalid, 116 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 107 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-12-17 21:45:02,752 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2021-12-17 21:45:02,758 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 66. [2021-12-17 21:45:02,758 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 57 states have (on average 1.4210526315789473) internal successors, (81), 58 states have internal predecessors, (81), 5 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-12-17 21:45:02,759 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 94 transitions. [2021-12-17 21:45:02,759 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 94 transitions. Word has length 48 [2021-12-17 21:45:02,759 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-17 21:45:02,759 INFO L470 AbstractCegarLoop]: Abstraction has 66 states and 94 transitions. [2021-12-17 21:45:02,775 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 5.625) internal successors, (45), 8 states have internal predecessors, (45), 2 states have call successors, (7), 2 states have call predecessors, (7), 4 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-12-17 21:45:02,775 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 94 transitions. [2021-12-17 21:45:02,780 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-12-17 21:45:02,780 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 21:45:02,780 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 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] [2021-12-17 21:45:02,789 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (8)] Forceful destruction successful, exit code 0 [2021-12-17 21:45:02,980 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-17 21:45:02,981 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 21:45:02,981 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 21:45:02,981 INFO L85 PathProgramCache]: Analyzing trace with hash -588856565, now seen corresponding path program 1 times [2021-12-17 21:45:02,981 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-17 21:45:02,981 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [330273511] [2021-12-17 21:45:02,981 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 21:45:02,981 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-17 21:45:02,981 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-17 21:45:02,982 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-17 21:45:02,984 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2021-12-17 21:45:03,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 21:45:03,020 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 5 conjunts are in the unsatisfiable core [2021-12-17 21:45:03,022 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-17 21:45:03,385 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 24 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-12-17 21:45:03,385 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-17 21:45:04,009 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 4 proven. 11 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-12-17 21:45:04,010 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-17 21:45:04,010 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [330273511] [2021-12-17 21:45:04,010 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [330273511] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-17 21:45:04,010 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-17 21:45:04,010 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 10 [2021-12-17 21:45:04,010 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1112645669] [2021-12-17 21:45:04,010 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-17 21:45:04,010 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-12-17 21:45:04,010 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-17 21:45:04,011 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-12-17 21:45:04,011 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2021-12-17 21:45:04,011 INFO L87 Difference]: Start difference. First operand 66 states and 94 transitions. Second operand has 10 states, 10 states have (on average 4.9) internal successors, (49), 10 states have internal predecessors, (49), 2 states have call successors, (7), 2 states have call predecessors, (7), 4 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-12-17 21:45:05,153 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-17 21:45:05,154 INFO L93 Difference]: Finished difference Result 162 states and 234 transitions. [2021-12-17 21:45:05,160 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-12-17 21:45:05,161 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 4.9) internal successors, (49), 10 states have internal predecessors, (49), 2 states have call successors, (7), 2 states have call predecessors, (7), 4 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 50 [2021-12-17 21:45:05,161 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-17 21:45:05,161 INFO L225 Difference]: With dead ends: 162 [2021-12-17 21:45:05,162 INFO L226 Difference]: Without dead ends: 104 [2021-12-17 21:45:05,162 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 93 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=94, Invalid=146, Unknown=0, NotChecked=0, Total=240 [2021-12-17 21:45:05,162 INFO L933 BasicCegarLoop]: 55 mSDtfsCounter, 138 mSDsluCounter, 195 mSDsCounter, 0 mSdLazyCounter, 131 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 138 SdHoareTripleChecker+Valid, 250 SdHoareTripleChecker+Invalid, 158 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 131 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-12-17 21:45:05,163 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [138 Valid, 250 Invalid, 158 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 131 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-12-17 21:45:05,163 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2021-12-17 21:45:05,169 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 70. [2021-12-17 21:45:05,169 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 61 states have (on average 1.4426229508196722) internal successors, (88), 62 states have internal predecessors, (88), 5 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-12-17 21:45:05,170 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 101 transitions. [2021-12-17 21:45:05,170 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 101 transitions. Word has length 50 [2021-12-17 21:45:05,170 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-17 21:45:05,170 INFO L470 AbstractCegarLoop]: Abstraction has 70 states and 101 transitions. [2021-12-17 21:45:05,170 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 4.9) internal successors, (49), 10 states have internal predecessors, (49), 2 states have call successors, (7), 2 states have call predecessors, (7), 4 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-12-17 21:45:05,170 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 101 transitions. [2021-12-17 21:45:05,171 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-12-17 21:45:05,171 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 21:45:05,171 INFO L514 BasicCegarLoop]: trace histogram [5, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-17 21:45:05,179 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (9)] Forceful destruction successful, exit code 0 [2021-12-17 21:45:05,378 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-17 21:45:05,379 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 21:45:05,380 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 21:45:05,380 INFO L85 PathProgramCache]: Analyzing trace with hash 1889085224, now seen corresponding path program 2 times [2021-12-17 21:45:05,380 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-17 21:45:05,380 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1268009449] [2021-12-17 21:45:05,380 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-17 21:45:05,380 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-17 21:45:05,381 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-17 21:45:05,381 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-17 21:45:05,383 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (10)] Waiting until timeout for monitored process [2021-12-17 21:45:05,413 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2021-12-17 21:45:05,414 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-17 21:45:05,415 INFO L263 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 7 conjunts are in the unsatisfiable core [2021-12-17 21:45:05,417 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-17 21:45:05,668 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2021-12-17 21:45:05,668 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-17 21:45:05,669 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-17 21:45:05,669 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1268009449] [2021-12-17 21:45:05,669 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1268009449] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-17 21:45:05,669 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-17 21:45:05,669 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-12-17 21:45:05,669 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1122020492] [2021-12-17 21:45:05,669 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-17 21:45:05,669 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-12-17 21:45:05,669 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-17 21:45:05,670 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-12-17 21:45:05,670 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-12-17 21:45:05,670 INFO L87 Difference]: Start difference. First operand 70 states and 101 transitions. Second operand has 6 states, 6 states have (on average 5.0) internal successors, (30), 5 states have internal predecessors, (30), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) [2021-12-17 21:45:05,839 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-17 21:45:05,839 INFO L93 Difference]: Finished difference Result 110 states and 159 transitions. [2021-12-17 21:45:05,840 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-17 21:45:05,840 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 5.0) internal successors, (30), 5 states have internal predecessors, (30), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) Word has length 57 [2021-12-17 21:45:05,840 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-17 21:45:05,841 INFO L225 Difference]: With dead ends: 110 [2021-12-17 21:45:05,841 INFO L226 Difference]: Without dead ends: 89 [2021-12-17 21:45:05,841 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-12-17 21:45:05,842 INFO L933 BasicCegarLoop]: 61 mSDtfsCounter, 17 mSDsluCounter, 236 mSDsCounter, 0 mSdLazyCounter, 25 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 297 SdHoareTripleChecker+Invalid, 28 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 25 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-17 21:45:05,842 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [17 Valid, 297 Invalid, 28 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 25 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-17 21:45:05,845 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2021-12-17 21:45:05,850 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 79. [2021-12-17 21:45:05,850 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 68 states have (on average 1.3970588235294117) internal successors, (95), 70 states have internal predecessors, (95), 5 states have call successors, (5), 3 states have call predecessors, (5), 5 states have return successors, (13), 5 states have call predecessors, (13), 4 states have call successors, (13) [2021-12-17 21:45:05,852 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 113 transitions. [2021-12-17 21:45:05,854 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 113 transitions. Word has length 57 [2021-12-17 21:45:05,854 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-17 21:45:05,855 INFO L470 AbstractCegarLoop]: Abstraction has 79 states and 113 transitions. [2021-12-17 21:45:05,856 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 5.0) internal successors, (30), 5 states have internal predecessors, (30), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) [2021-12-17 21:45:05,856 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 113 transitions. [2021-12-17 21:45:05,856 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-12-17 21:45:05,856 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 21:45:05,856 INFO L514 BasicCegarLoop]: trace histogram [5, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-17 21:45:05,864 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (10)] Forceful destruction successful, exit code 0 [2021-12-17 21:45:06,060 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-17 21:45:06,060 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 21:45:06,061 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 21:45:06,062 INFO L85 PathProgramCache]: Analyzing trace with hash -1704817494, now seen corresponding path program 1 times [2021-12-17 21:45:06,062 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-17 21:45:06,063 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1388048566] [2021-12-17 21:45:06,063 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 21:45:06,063 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-17 21:45:06,063 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-17 21:45:06,064 INFO L229 MonitoredProcess]: Starting monitored process 11 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-17 21:45:06,066 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (11)] Waiting until timeout for monitored process [2021-12-17 21:45:06,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 21:45:06,135 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 7 conjunts are in the unsatisfiable core [2021-12-17 21:45:06,136 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-17 21:45:06,803 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 24 proven. 26 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-12-17 21:45:06,804 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-17 21:45:07,997 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 4 proven. 34 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-12-17 21:45:07,998 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-17 21:45:07,998 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1388048566] [2021-12-17 21:45:07,998 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1388048566] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-17 21:45:07,998 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-17 21:45:07,998 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 14 [2021-12-17 21:45:07,998 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [188010684] [2021-12-17 21:45:07,998 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-17 21:45:07,998 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-12-17 21:45:07,998 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-17 21:45:07,999 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-12-17 21:45:07,999 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2021-12-17 21:45:07,999 INFO L87 Difference]: Start difference. First operand 79 states and 113 transitions. Second operand has 14 states, 14 states have (on average 4.5) internal successors, (63), 14 states have internal predecessors, (63), 2 states have call successors, (7), 2 states have call predecessors, (7), 4 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-12-17 21:45:10,601 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-17 21:45:10,601 INFO L93 Difference]: Finished difference Result 221 states and 318 transitions. [2021-12-17 21:45:10,602 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-12-17 21:45:10,602 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 4.5) internal successors, (63), 14 states have internal predecessors, (63), 2 states have call successors, (7), 2 states have call predecessors, (7), 4 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 57 [2021-12-17 21:45:10,602 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-17 21:45:10,603 INFO L225 Difference]: With dead ends: 221 [2021-12-17 21:45:10,603 INFO L226 Difference]: Without dead ends: 150 [2021-12-17 21:45:10,604 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 109 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=183, Invalid=323, Unknown=0, NotChecked=0, Total=506 [2021-12-17 21:45:10,604 INFO L933 BasicCegarLoop]: 84 mSDtfsCounter, 178 mSDsluCounter, 421 mSDsCounter, 0 mSdLazyCounter, 277 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 178 SdHoareTripleChecker+Valid, 505 SdHoareTripleChecker+Invalid, 307 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 277 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2021-12-17 21:45:10,604 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [178 Valid, 505 Invalid, 307 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 277 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2021-12-17 21:45:10,605 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2021-12-17 21:45:10,613 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 93. [2021-12-17 21:45:10,613 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 82 states have (on average 1.4390243902439024) internal successors, (118), 84 states have internal predecessors, (118), 5 states have call successors, (5), 3 states have call predecessors, (5), 5 states have return successors, (13), 5 states have call predecessors, (13), 4 states have call successors, (13) [2021-12-17 21:45:10,614 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 136 transitions. [2021-12-17 21:45:10,614 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 136 transitions. Word has length 57 [2021-12-17 21:45:10,614 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-17 21:45:10,614 INFO L470 AbstractCegarLoop]: Abstraction has 93 states and 136 transitions. [2021-12-17 21:45:10,614 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 4.5) internal successors, (63), 14 states have internal predecessors, (63), 2 states have call successors, (7), 2 states have call predecessors, (7), 4 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-12-17 21:45:10,614 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 136 transitions. [2021-12-17 21:45:10,615 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-12-17 21:45:10,615 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 21:45:10,615 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 5, 4, 4, 4, 3, 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] [2021-12-17 21:45:10,631 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (11)] Ended with exit code 0 [2021-12-17 21:45:10,822 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-17 21:45:10,823 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 21:45:10,823 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 21:45:10,823 INFO L85 PathProgramCache]: Analyzing trace with hash -848364147, now seen corresponding path program 1 times [2021-12-17 21:45:10,823 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-17 21:45:10,824 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1591926584] [2021-12-17 21:45:10,824 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 21:45:10,824 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-17 21:45:10,824 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-17 21:45:10,825 INFO L229 MonitoredProcess]: Starting monitored process 12 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-17 21:45:10,826 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (12)] Waiting until timeout for monitored process [2021-12-17 21:45:10,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 21:45:10,865 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 9 conjunts are in the unsatisfiable core [2021-12-17 21:45:10,866 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-17 21:45:11,620 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 24 proven. 45 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-12-17 21:45:11,621 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-17 21:45:13,087 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 4 proven. 53 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-12-17 21:45:13,087 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-17 21:45:13,087 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1591926584] [2021-12-17 21:45:13,087 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1591926584] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-17 21:45:13,087 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-17 21:45:13,087 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 18 [2021-12-17 21:45:13,088 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [98676688] [2021-12-17 21:45:13,088 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-17 21:45:13,088 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-12-17 21:45:13,088 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-17 21:45:13,088 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-12-17 21:45:13,088 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=209, Unknown=0, NotChecked=0, Total=306 [2021-12-17 21:45:13,089 INFO L87 Difference]: Start difference. First operand 93 states and 136 transitions. Second operand has 18 states, 18 states have (on average 4.055555555555555) internal successors, (73), 18 states have internal predecessors, (73), 2 states have call successors, (7), 2 states have call predecessors, (7), 4 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-12-17 21:45:16,922 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-17 21:45:16,922 INFO L93 Difference]: Finished difference Result 244 states and 356 transitions. [2021-12-17 21:45:16,926 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-12-17 21:45:16,926 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 4.055555555555555) internal successors, (73), 18 states have internal predecessors, (73), 2 states have call successors, (7), 2 states have call predecessors, (7), 4 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 62 [2021-12-17 21:45:16,926 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-17 21:45:16,927 INFO L225 Difference]: With dead ends: 244 [2021-12-17 21:45:16,927 INFO L226 Difference]: Without dead ends: 159 [2021-12-17 21:45:16,928 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 113 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 138 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=354, Invalid=638, Unknown=0, NotChecked=0, Total=992 [2021-12-17 21:45:16,928 INFO L933 BasicCegarLoop]: 63 mSDtfsCounter, 321 mSDsluCounter, 723 mSDsCounter, 0 mSdLazyCounter, 431 mSolverCounterSat, 71 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 321 SdHoareTripleChecker+Valid, 786 SdHoareTripleChecker+Invalid, 502 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 71 IncrementalHoareTripleChecker+Valid, 431 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.1s IncrementalHoareTripleChecker+Time [2021-12-17 21:45:16,928 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [321 Valid, 786 Invalid, 502 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [71 Valid, 431 Invalid, 0 Unknown, 0 Unchecked, 2.1s Time] [2021-12-17 21:45:16,929 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 159 states. [2021-12-17 21:45:16,940 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 159 to 103. [2021-12-17 21:45:16,940 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 92 states have (on average 1.4673913043478262) internal successors, (135), 94 states have internal predecessors, (135), 5 states have call successors, (5), 3 states have call predecessors, (5), 5 states have return successors, (13), 5 states have call predecessors, (13), 4 states have call successors, (13) [2021-12-17 21:45:16,944 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 153 transitions. [2021-12-17 21:45:16,945 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 153 transitions. Word has length 62 [2021-12-17 21:45:16,946 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-17 21:45:16,946 INFO L470 AbstractCegarLoop]: Abstraction has 103 states and 153 transitions. [2021-12-17 21:45:16,946 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 4.055555555555555) internal successors, (73), 18 states have internal predecessors, (73), 2 states have call successors, (7), 2 states have call predecessors, (7), 4 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-12-17 21:45:16,946 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 153 transitions. [2021-12-17 21:45:16,947 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-12-17 21:45:16,947 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 21:45:16,947 INFO L514 BasicCegarLoop]: trace histogram [11, 10, 10, 4, 4, 4, 3, 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] [2021-12-17 21:45:16,955 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (12)] Ended with exit code 0 [2021-12-17 21:45:17,154 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-17 21:45:17,155 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 21:45:17,155 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 21:45:17,155 INFO L85 PathProgramCache]: Analyzing trace with hash -115561174, now seen corresponding path program 2 times [2021-12-17 21:45:17,156 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-17 21:45:17,156 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [801547257] [2021-12-17 21:45:17,156 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-17 21:45:17,156 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-17 21:45:17,156 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-17 21:45:17,157 INFO L229 MonitoredProcess]: Starting monitored process 13 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-17 21:45:17,158 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (13)] Waiting until timeout for monitored process [2021-12-17 21:45:17,205 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2021-12-17 21:45:17,205 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-17 21:45:17,207 INFO L263 TraceCheckSpWp]: Trace formula consists of 47 conjuncts, 2 conjunts are in the unsatisfiable core [2021-12-17 21:45:17,208 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-17 21:45:17,333 INFO L134 CoverageAnalysis]: Checked inductivity of 185 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 185 trivial. 0 not checked. [2021-12-17 21:45:17,333 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-17 21:45:17,333 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-17 21:45:17,333 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [801547257] [2021-12-17 21:45:17,333 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [801547257] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-17 21:45:17,333 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-17 21:45:17,334 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-12-17 21:45:17,334 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1632652353] [2021-12-17 21:45:17,334 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-17 21:45:17,334 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-17 21:45:17,334 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-17 21:45:17,334 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-17 21:45:17,334 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-17 21:45:17,334 INFO L87 Difference]: Start difference. First operand 103 states and 153 transitions. Second operand has 3 states, 3 states have (on average 9.0) internal successors, (27), 3 states have internal predecessors, (27), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2021-12-17 21:45:17,374 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-17 21:45:17,375 INFO L93 Difference]: Finished difference Result 112 states and 163 transitions. [2021-12-17 21:45:17,376 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-17 21:45:17,376 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 9.0) internal successors, (27), 3 states have internal predecessors, (27), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) Word has length 75 [2021-12-17 21:45:17,376 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-17 21:45:17,377 INFO L225 Difference]: With dead ends: 112 [2021-12-17 21:45:17,377 INFO L226 Difference]: Without dead ends: 103 [2021-12-17 21:45:17,377 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 73 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-17 21:45:17,377 INFO L933 BasicCegarLoop]: 65 mSDtfsCounter, 0 mSDsluCounter, 61 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 126 SdHoareTripleChecker+Invalid, 3 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-17 21:45:17,377 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 126 Invalid, 3 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-17 21:45:17,378 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2021-12-17 21:45:17,384 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 103. [2021-12-17 21:45:17,384 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 92 states have (on average 1.4565217391304348) internal successors, (134), 94 states have internal predecessors, (134), 5 states have call successors, (5), 3 states have call predecessors, (5), 5 states have return successors, (13), 5 states have call predecessors, (13), 4 states have call successors, (13) [2021-12-17 21:45:17,385 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 152 transitions. [2021-12-17 21:45:17,385 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 152 transitions. Word has length 75 [2021-12-17 21:45:17,385 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-17 21:45:17,385 INFO L470 AbstractCegarLoop]: Abstraction has 103 states and 152 transitions. [2021-12-17 21:45:17,385 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 9.0) internal successors, (27), 3 states have internal predecessors, (27), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2021-12-17 21:45:17,385 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 152 transitions. [2021-12-17 21:45:17,386 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-12-17 21:45:17,386 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 21:45:17,386 INFO L514 BasicCegarLoop]: trace histogram [11, 10, 10, 4, 4, 4, 3, 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] [2021-12-17 21:45:17,415 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (13)] Ended with exit code 0 [2021-12-17 21:45:17,586 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-17 21:45:17,586 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 21:45:17,587 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 21:45:17,587 INFO L85 PathProgramCache]: Analyzing trace with hash 1364778096, now seen corresponding path program 1 times [2021-12-17 21:45:17,587 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-17 21:45:17,587 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [851807125] [2021-12-17 21:45:17,587 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 21:45:17,587 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-17 21:45:17,587 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-17 21:45:17,588 INFO L229 MonitoredProcess]: Starting monitored process 14 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-17 21:45:17,589 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (14)] Waiting until timeout for monitored process [2021-12-17 21:45:17,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 21:45:17,631 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 13 conjunts are in the unsatisfiable core [2021-12-17 21:45:17,632 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-17 21:45:19,150 INFO L134 CoverageAnalysis]: Checked inductivity of 185 backedges. 24 proven. 155 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-12-17 21:45:19,150 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-17 21:45:22,392 INFO L134 CoverageAnalysis]: Checked inductivity of 185 backedges. 4 proven. 163 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-12-17 21:45:22,392 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-17 21:45:22,392 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [851807125] [2021-12-17 21:45:22,392 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [851807125] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-17 21:45:22,392 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-17 21:45:22,393 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 26 [2021-12-17 21:45:22,393 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [847837363] [2021-12-17 21:45:22,393 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-17 21:45:22,393 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-12-17 21:45:22,393 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-17 21:45:22,393 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-12-17 21:45:22,394 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=193, Invalid=457, Unknown=0, NotChecked=0, Total=650 [2021-12-17 21:45:22,394 INFO L87 Difference]: Start difference. First operand 103 states and 152 transitions. Second operand has 26 states, 26 states have (on average 3.8846153846153846) internal successors, (101), 26 states have internal predecessors, (101), 2 states have call successors, (7), 2 states have call predecessors, (7), 4 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-12-17 21:45:32,728 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-17 21:45:32,728 INFO L93 Difference]: Finished difference Result 347 states and 504 transitions. [2021-12-17 21:45:32,729 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-12-17 21:45:32,729 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 3.8846153846153846) internal successors, (101), 26 states have internal predecessors, (101), 2 states have call successors, (7), 2 states have call predecessors, (7), 4 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 77 [2021-12-17 21:45:32,730 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-17 21:45:32,731 INFO L225 Difference]: With dead ends: 347 [2021-12-17 21:45:32,731 INFO L226 Difference]: Without dead ends: 252 [2021-12-17 21:45:32,732 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 194 GetRequests, 149 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 300 ImplicationChecksByTransitivity, 7.5s TimeCoverageRelationStatistics Valid=729, Invalid=1433, Unknown=0, NotChecked=0, Total=2162 [2021-12-17 21:45:32,732 INFO L933 BasicCegarLoop]: 125 mSDtfsCounter, 642 mSDsluCounter, 1436 mSDsCounter, 0 mSdLazyCounter, 1087 mSolverCounterSat, 99 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 642 SdHoareTripleChecker+Valid, 1561 SdHoareTripleChecker+Invalid, 1186 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 99 IncrementalHoareTripleChecker+Valid, 1087 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.8s IncrementalHoareTripleChecker+Time [2021-12-17 21:45:32,732 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [642 Valid, 1561 Invalid, 1186 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [99 Valid, 1087 Invalid, 0 Unknown, 0 Unchecked, 5.8s Time] [2021-12-17 21:45:32,733 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 252 states. [2021-12-17 21:45:32,744 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 252 to 129. [2021-12-17 21:45:32,745 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 129 states, 118 states have (on average 1.5) internal successors, (177), 120 states have internal predecessors, (177), 5 states have call successors, (5), 3 states have call predecessors, (5), 5 states have return successors, (13), 5 states have call predecessors, (13), 4 states have call successors, (13) [2021-12-17 21:45:32,745 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 195 transitions. [2021-12-17 21:45:32,746 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 195 transitions. Word has length 77 [2021-12-17 21:45:32,746 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-17 21:45:32,746 INFO L470 AbstractCegarLoop]: Abstraction has 129 states and 195 transitions. [2021-12-17 21:45:32,746 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 3.8846153846153846) internal successors, (101), 26 states have internal predecessors, (101), 2 states have call successors, (7), 2 states have call predecessors, (7), 4 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-12-17 21:45:32,746 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 195 transitions. [2021-12-17 21:45:32,747 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-12-17 21:45:32,747 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 21:45:32,747 INFO L514 BasicCegarLoop]: trace histogram [14, 14, 13, 4, 4, 4, 3, 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] [2021-12-17 21:45:32,755 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (14)] Ended with exit code 0 [2021-12-17 21:45:32,955 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-17 21:45:32,955 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 21:45:32,956 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 21:45:32,956 INFO L85 PathProgramCache]: Analyzing trace with hash 875383315, now seen corresponding path program 1 times [2021-12-17 21:45:32,956 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-17 21:45:32,956 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1303193533] [2021-12-17 21:45:32,956 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 21:45:32,956 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-17 21:45:32,956 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-17 21:45:32,957 INFO L229 MonitoredProcess]: Starting monitored process 15 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-17 21:45:32,959 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (15)] Waiting until timeout for monitored process [2021-12-17 21:45:33,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 21:45:33,009 INFO L263 TraceCheckSpWp]: Trace formula consists of 158 conjuncts, 17 conjunts are in the unsatisfiable core [2021-12-17 21:45:33,011 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-17 21:45:35,003 INFO L134 CoverageAnalysis]: Checked inductivity of 303 backedges. 24 proven. 273 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-12-17 21:45:35,004 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-17 21:45:38,935 INFO L134 CoverageAnalysis]: Checked inductivity of 303 backedges. 4 proven. 281 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-12-17 21:45:38,935 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-17 21:45:38,935 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1303193533] [2021-12-17 21:45:38,935 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1303193533] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-17 21:45:38,935 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-17 21:45:38,935 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 34 [2021-12-17 21:45:38,935 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [436454808] [2021-12-17 21:45:38,935 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-17 21:45:38,936 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-12-17 21:45:38,936 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-17 21:45:38,936 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-12-17 21:45:38,936 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=306, Invalid=816, Unknown=0, NotChecked=0, Total=1122 [2021-12-17 21:45:38,937 INFO L87 Difference]: Start difference. First operand 129 states and 195 transitions. Second operand has 34 states, 34 states have (on average 3.6176470588235294) internal successors, (123), 34 states have internal predecessors, (123), 2 states have call successors, (7), 2 states have call predecessors, (7), 4 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-12-17 21:45:48,355 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-17 21:45:48,356 INFO L93 Difference]: Finished difference Result 348 states and 510 transitions. [2021-12-17 21:45:48,356 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-12-17 21:45:48,356 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 3.6176470588235294) internal successors, (123), 34 states have internal predecessors, (123), 2 states have call successors, (7), 2 states have call predecessors, (7), 4 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 88 [2021-12-17 21:45:48,357 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-17 21:45:48,358 INFO L225 Difference]: With dead ends: 348 [2021-12-17 21:45:48,358 INFO L226 Difference]: Without dead ends: 227 [2021-12-17 21:45:48,359 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 207 GetRequests, 151 SyntacticMatches, 0 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 463 ImplicationChecksByTransitivity, 7.8s TimeCoverageRelationStatistics Valid=991, Invalid=2315, Unknown=0, NotChecked=0, Total=3306 [2021-12-17 21:45:48,359 INFO L933 BasicCegarLoop]: 78 mSDtfsCounter, 777 mSDsluCounter, 1582 mSDsCounter, 0 mSdLazyCounter, 1231 mSolverCounterSat, 195 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 777 SdHoareTripleChecker+Valid, 1660 SdHoareTripleChecker+Invalid, 1426 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 195 IncrementalHoareTripleChecker+Valid, 1231 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.5s IncrementalHoareTripleChecker+Time [2021-12-17 21:45:48,359 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [777 Valid, 1660 Invalid, 1426 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [195 Valid, 1231 Invalid, 0 Unknown, 0 Unchecked, 5.5s Time] [2021-12-17 21:45:48,360 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 227 states. [2021-12-17 21:45:48,378 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 227 to 133. [2021-12-17 21:45:48,378 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 122 states have (on average 1.5081967213114753) internal successors, (184), 124 states have internal predecessors, (184), 5 states have call successors, (5), 3 states have call predecessors, (5), 5 states have return successors, (13), 5 states have call predecessors, (13), 4 states have call successors, (13) [2021-12-17 21:45:48,379 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 202 transitions. [2021-12-17 21:45:48,379 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 202 transitions. Word has length 88 [2021-12-17 21:45:48,379 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-17 21:45:48,379 INFO L470 AbstractCegarLoop]: Abstraction has 133 states and 202 transitions. [2021-12-17 21:45:48,380 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 3.6176470588235294) internal successors, (123), 34 states have internal predecessors, (123), 2 states have call successors, (7), 2 states have call predecessors, (7), 4 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-12-17 21:45:48,380 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 202 transitions. [2021-12-17 21:45:48,380 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2021-12-17 21:45:48,380 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 21:45:48,381 INFO L514 BasicCegarLoop]: trace histogram [23, 22, 22, 4, 4, 4, 3, 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] [2021-12-17 21:45:48,389 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (15)] Forceful destruction successful, exit code 0 [2021-12-17 21:45:48,585 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-17 21:45:48,588 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 21:45:48,589 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 21:45:48,589 INFO L85 PathProgramCache]: Analyzing trace with hash -1663337104, now seen corresponding path program 2 times [2021-12-17 21:45:48,589 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-17 21:45:48,589 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [575965395] [2021-12-17 21:45:48,589 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-17 21:45:48,590 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-17 21:45:48,590 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-17 21:45:48,604 INFO L229 MonitoredProcess]: Starting monitored process 16 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-17 21:45:48,639 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (16)] Waiting until timeout for monitored process [2021-12-17 21:45:48,668 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2021-12-17 21:45:48,668 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-17 21:45:48,669 INFO L263 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 4 conjunts are in the unsatisfiable core [2021-12-17 21:45:48,670 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-17 21:45:48,909 INFO L134 CoverageAnalysis]: Checked inductivity of 767 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 767 trivial. 0 not checked. [2021-12-17 21:45:48,909 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-17 21:45:48,909 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-17 21:45:48,909 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [575965395] [2021-12-17 21:45:48,909 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [575965395] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-17 21:45:48,909 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-17 21:45:48,909 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-12-17 21:45:48,909 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1155076844] [2021-12-17 21:45:48,909 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-17 21:45:48,910 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-12-17 21:45:48,910 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-17 21:45:48,910 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-12-17 21:45:48,910 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-12-17 21:45:48,910 INFO L87 Difference]: Start difference. First operand 133 states and 202 transitions. Second operand has 4 states, 4 states have (on average 7.25) internal successors, (29), 4 states have internal predecessors, (29), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2021-12-17 21:45:49,069 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-17 21:45:49,069 INFO L93 Difference]: Finished difference Result 170 states and 252 transitions. [2021-12-17 21:45:49,070 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-12-17 21:45:49,070 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 7.25) internal successors, (29), 4 states have internal predecessors, (29), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) Word has length 113 [2021-12-17 21:45:49,070 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-17 21:45:49,071 INFO L225 Difference]: With dead ends: 170 [2021-12-17 21:45:49,071 INFO L226 Difference]: Without dead ends: 160 [2021-12-17 21:45:49,071 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 110 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-12-17 21:45:49,071 INFO L933 BasicCegarLoop]: 70 mSDtfsCounter, 44 mSDsluCounter, 132 mSDsCounter, 0 mSdLazyCounter, 25 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 202 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 25 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-17 21:45:49,072 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [44 Valid, 202 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 25 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-17 21:45:49,072 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2021-12-17 21:45:49,079 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 138. [2021-12-17 21:45:49,080 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 138 states, 127 states have (on average 1.4960629921259843) internal successors, (190), 129 states have internal predecessors, (190), 5 states have call successors, (5), 3 states have call predecessors, (5), 5 states have return successors, (13), 5 states have call predecessors, (13), 4 states have call successors, (13) [2021-12-17 21:45:49,080 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 208 transitions. [2021-12-17 21:45:49,081 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 208 transitions. Word has length 113 [2021-12-17 21:45:49,081 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-17 21:45:49,081 INFO L470 AbstractCegarLoop]: Abstraction has 138 states and 208 transitions. [2021-12-17 21:45:49,081 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 7.25) internal successors, (29), 4 states have internal predecessors, (29), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2021-12-17 21:45:49,081 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 208 transitions. [2021-12-17 21:45:49,082 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2021-12-17 21:45:49,082 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 21:45:49,082 INFO L514 BasicCegarLoop]: trace histogram [23, 22, 22, 4, 4, 4, 3, 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] [2021-12-17 21:45:49,101 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (16)] Ended with exit code 0 [2021-12-17 21:45:49,282 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-17 21:45:49,282 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 21:45:49,283 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 21:45:49,283 INFO L85 PathProgramCache]: Analyzing trace with hash 1822283566, now seen corresponding path program 1 times [2021-12-17 21:45:49,283 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-17 21:45:49,283 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [773625150] [2021-12-17 21:45:49,283 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 21:45:49,283 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-17 21:45:49,283 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-17 21:45:49,284 INFO L229 MonitoredProcess]: Starting monitored process 17 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-17 21:45:49,285 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (17)] Waiting until timeout for monitored process [2021-12-17 21:45:49,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 21:45:49,340 INFO L263 TraceCheckSpWp]: Trace formula consists of 198 conjuncts, 25 conjunts are in the unsatisfiable core [2021-12-17 21:45:49,342 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-17 21:45:53,495 INFO L134 CoverageAnalysis]: Checked inductivity of 767 backedges. 24 proven. 737 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-12-17 21:45:53,495 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-17 21:46:03,071 INFO L134 CoverageAnalysis]: Checked inductivity of 767 backedges. 4 proven. 745 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-12-17 21:46:03,072 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-17 21:46:03,072 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [773625150] [2021-12-17 21:46:03,072 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [773625150] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-17 21:46:03,072 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-17 21:46:03,072 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26] total 50 [2021-12-17 21:46:03,072 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [641315689] [2021-12-17 21:46:03,072 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-17 21:46:03,072 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2021-12-17 21:46:03,072 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-17 21:46:03,073 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-12-17 21:46:03,073 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=673, Invalid=1777, Unknown=0, NotChecked=0, Total=2450 [2021-12-17 21:46:03,073 INFO L87 Difference]: Start difference. First operand 138 states and 208 transitions. Second operand has 50 states, 50 states have (on average 3.46) internal successors, (173), 50 states have internal predecessors, (173), 2 states have call successors, (7), 2 states have call predecessors, (7), 4 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-12-17 21:46:44,587 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-17 21:46:44,587 INFO L93 Difference]: Finished difference Result 591 states and 868 transitions. [2021-12-17 21:46:44,588 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2021-12-17 21:46:44,589 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 3.46) internal successors, (173), 50 states have internal predecessors, (173), 2 states have call successors, (7), 2 states have call predecessors, (7), 4 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 113 [2021-12-17 21:46:44,589 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-17 21:46:44,591 INFO L225 Difference]: With dead ends: 591 [2021-12-17 21:46:44,591 INFO L226 Difference]: Without dead ends: 461 [2021-12-17 21:46:44,592 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 314 GetRequests, 221 SyntacticMatches, 0 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1452 ImplicationChecksByTransitivity, 30.1s TimeCoverageRelationStatistics Valid=2901, Invalid=6029, Unknown=0, NotChecked=0, Total=8930 [2021-12-17 21:46:44,593 INFO L933 BasicCegarLoop]: 209 mSDtfsCounter, 2260 mSDsluCounter, 4808 mSDsCounter, 0 mSdLazyCounter, 4147 mSolverCounterSat, 345 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 20.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2260 SdHoareTripleChecker+Valid, 5017 SdHoareTripleChecker+Invalid, 4492 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 345 IncrementalHoareTripleChecker+Valid, 4147 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 21.7s IncrementalHoareTripleChecker+Time [2021-12-17 21:46:44,593 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2260 Valid, 5017 Invalid, 4492 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [345 Valid, 4147 Invalid, 0 Unknown, 0 Unchecked, 21.7s Time] [2021-12-17 21:46:44,594 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 461 states. [2021-12-17 21:46:44,609 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 461 to 206. [2021-12-17 21:46:44,609 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 206 states, 195 states have (on average 1.5538461538461539) internal successors, (303), 197 states have internal predecessors, (303), 5 states have call successors, (5), 3 states have call predecessors, (5), 5 states have return successors, (13), 5 states have call predecessors, (13), 4 states have call successors, (13) [2021-12-17 21:46:44,610 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 206 states to 206 states and 321 transitions. [2021-12-17 21:46:44,611 INFO L78 Accepts]: Start accepts. Automaton has 206 states and 321 transitions. Word has length 113 [2021-12-17 21:46:44,611 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-17 21:46:44,611 INFO L470 AbstractCegarLoop]: Abstraction has 206 states and 321 transitions. [2021-12-17 21:46:44,611 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 3.46) internal successors, (173), 50 states have internal predecessors, (173), 2 states have call successors, (7), 2 states have call predecessors, (7), 4 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-12-17 21:46:44,611 INFO L276 IsEmpty]: Start isEmpty. Operand 206 states and 321 transitions. [2021-12-17 21:46:44,612 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2021-12-17 21:46:44,612 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 21:46:44,612 INFO L514 BasicCegarLoop]: trace histogram [24, 24, 23, 4, 4, 4, 3, 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] [2021-12-17 21:46:44,621 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (17)] Forceful destruction successful, exit code 0 [2021-12-17 21:46:44,821 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-17 21:46:44,821 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 21:46:44,821 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 21:46:44,822 INFO L85 PathProgramCache]: Analyzing trace with hash 239945809, now seen corresponding path program 1 times [2021-12-17 21:46:44,822 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-17 21:46:44,822 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1558023560] [2021-12-17 21:46:44,822 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 21:46:44,822 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-17 21:46:44,822 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-17 21:46:44,823 INFO L229 MonitoredProcess]: Starting monitored process 18 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-17 21:46:44,838 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (18)] Waiting until timeout for monitored process [2021-12-17 21:46:44,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 21:46:44,887 INFO L263 TraceCheckSpWp]: Trace formula consists of 208 conjuncts, 63 conjunts are in the unsatisfiable core [2021-12-17 21:46:44,889 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-17 21:46:54,057 INFO L134 CoverageAnalysis]: Checked inductivity of 858 backedges. 10 proven. 836 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-12-17 21:46:54,057 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-17 21:47:11,231 INFO L134 CoverageAnalysis]: Checked inductivity of 858 backedges. 10 proven. 836 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-12-17 21:47:11,232 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-17 21:47:11,232 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1558023560] [2021-12-17 21:47:11,232 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1558023560] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-17 21:47:11,232 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-17 21:47:11,232 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35] total 66 [2021-12-17 21:47:11,232 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [444811206] [2021-12-17 21:47:11,232 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-17 21:47:11,232 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 66 states [2021-12-17 21:47:11,232 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-17 21:47:11,233 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2021-12-17 21:47:11,234 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=766, Invalid=3524, Unknown=0, NotChecked=0, Total=4290 [2021-12-17 21:47:11,234 INFO L87 Difference]: Start difference. First operand 206 states and 321 transitions. Second operand has 66 states, 66 states have (on average 2.878787878787879) internal successors, (190), 62 states have internal predecessors, (190), 4 states have call successors, (7), 2 states have call predecessors, (7), 4 states have return successors, (7), 7 states have call predecessors, (7), 3 states have call successors, (7) [2021-12-17 21:50:15,557 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-17 21:50:15,558 INFO L93 Difference]: Finished difference Result 570 states and 1123 transitions. [2021-12-17 21:50:15,558 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 209 states. [2021-12-17 21:50:15,559 INFO L78 Accepts]: Start accepts. Automaton has has 66 states, 66 states have (on average 2.878787878787879) internal successors, (190), 62 states have internal predecessors, (190), 4 states have call successors, (7), 2 states have call predecessors, (7), 4 states have return successors, (7), 7 states have call predecessors, (7), 3 states have call successors, (7) Word has length 118 [2021-12-17 21:50:15,559 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-17 21:50:15,571 INFO L225 Difference]: With dead ends: 570 [2021-12-17 21:50:15,577 INFO L226 Difference]: Without dead ends: 547 [2021-12-17 21:50:15,587 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 428 GetRequests, 190 SyntacticMatches, 1 SemanticMatches, 237 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18854 ImplicationChecksByTransitivity, 143.1s TimeCoverageRelationStatistics Valid=11300, Invalid=45582, Unknown=0, NotChecked=0, Total=56882 [2021-12-17 21:50:15,588 INFO L933 BasicCegarLoop]: 101 mSDtfsCounter, 2320 mSDsluCounter, 3484 mSDsCounter, 0 mSdLazyCounter, 11832 mSolverCounterSat, 1701 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 56.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2328 SdHoareTripleChecker+Valid, 3585 SdHoareTripleChecker+Invalid, 13533 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 1701 IncrementalHoareTripleChecker+Valid, 11832 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 60.3s IncrementalHoareTripleChecker+Time [2021-12-17 21:50:15,595 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2328 Valid, 3585 Invalid, 13533 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [1701 Valid, 11832 Invalid, 0 Unknown, 0 Unchecked, 60.3s Time] [2021-12-17 21:50:15,596 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 547 states. [2021-12-17 21:50:15,633 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 547 to 224. [2021-12-17 21:50:15,634 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 224 states, 210 states have (on average 1.5476190476190477) internal successors, (325), 213 states have internal predecessors, (325), 7 states have call successors, (7), 3 states have call predecessors, (7), 6 states have return successors, (25), 7 states have call predecessors, (25), 6 states have call successors, (25) [2021-12-17 21:50:15,635 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 224 states to 224 states and 357 transitions. [2021-12-17 21:50:15,635 INFO L78 Accepts]: Start accepts. Automaton has 224 states and 357 transitions. Word has length 118 [2021-12-17 21:50:15,636 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-17 21:50:15,636 INFO L470 AbstractCegarLoop]: Abstraction has 224 states and 357 transitions. [2021-12-17 21:50:15,636 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 66 states, 66 states have (on average 2.878787878787879) internal successors, (190), 62 states have internal predecessors, (190), 4 states have call successors, (7), 2 states have call predecessors, (7), 4 states have return successors, (7), 7 states have call predecessors, (7), 3 states have call successors, (7) [2021-12-17 21:50:15,636 INFO L276 IsEmpty]: Start isEmpty. Operand 224 states and 357 transitions. [2021-12-17 21:50:15,637 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2021-12-17 21:50:15,637 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 21:50:15,637 INFO L514 BasicCegarLoop]: trace histogram [24, 24, 23, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-17 21:50:15,658 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (18)] Ended with exit code 0 [2021-12-17 21:50:15,845 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-17 21:50:15,856 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 21:50:15,856 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 21:50:15,856 INFO L85 PathProgramCache]: Analyzing trace with hash 729167484, now seen corresponding path program 1 times [2021-12-17 21:50:15,857 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-17 21:50:15,857 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1763174492] [2021-12-17 21:50:15,857 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 21:50:15,857 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-17 21:50:15,857 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-17 21:50:15,872 INFO L229 MonitoredProcess]: Starting monitored process 19 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-17 21:50:15,896 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (19)] Waiting until timeout for monitored process [2021-12-17 21:50:15,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 21:50:15,958 INFO L263 TraceCheckSpWp]: Trace formula consists of 216 conjuncts, 3 conjunts are in the unsatisfiable core [2021-12-17 21:50:15,959 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-17 21:50:16,165 INFO L134 CoverageAnalysis]: Checked inductivity of 860 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 860 trivial. 0 not checked. [2021-12-17 21:50:16,165 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-17 21:50:16,166 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-17 21:50:16,166 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1763174492] [2021-12-17 21:50:16,166 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1763174492] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-17 21:50:16,166 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-17 21:50:16,166 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-12-17 21:50:16,166 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [662214490] [2021-12-17 21:50:16,166 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-17 21:50:16,166 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-12-17 21:50:16,166 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-17 21:50:16,166 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-12-17 21:50:16,166 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-12-17 21:50:16,167 INFO L87 Difference]: Start difference. First operand 224 states and 357 transitions. Second operand has 4 states, 4 states have (on average 8.25) internal successors, (33), 4 states have internal predecessors, (33), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2021-12-17 21:50:16,259 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-17 21:50:16,259 INFO L93 Difference]: Finished difference Result 234 states and 368 transitions. [2021-12-17 21:50:16,259 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-12-17 21:50:16,259 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 8.25) internal successors, (33), 4 states have internal predecessors, (33), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) Word has length 122 [2021-12-17 21:50:16,260 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-17 21:50:16,261 INFO L225 Difference]: With dead ends: 234 [2021-12-17 21:50:16,261 INFO L226 Difference]: Without dead ends: 224 [2021-12-17 21:50:16,261 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 119 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-12-17 21:50:16,261 INFO L933 BasicCegarLoop]: 64 mSDtfsCounter, 1 mSDsluCounter, 121 mSDsCounter, 0 mSdLazyCounter, 7 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 185 SdHoareTripleChecker+Invalid, 7 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 7 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-17 21:50:16,262 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 185 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 7 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-17 21:50:16,262 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 224 states. [2021-12-17 21:50:16,297 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 224 to 219. [2021-12-17 21:50:16,299 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 219 states, 205 states have (on average 1.551219512195122) internal successors, (318), 208 states have internal predecessors, (318), 7 states have call successors, (7), 3 states have call predecessors, (7), 6 states have return successors, (25), 7 states have call predecessors, (25), 6 states have call successors, (25) [2021-12-17 21:50:16,300 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 219 states to 219 states and 350 transitions. [2021-12-17 21:50:16,300 INFO L78 Accepts]: Start accepts. Automaton has 219 states and 350 transitions. Word has length 122 [2021-12-17 21:50:16,300 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-17 21:50:16,300 INFO L470 AbstractCegarLoop]: Abstraction has 219 states and 350 transitions. [2021-12-17 21:50:16,300 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 8.25) internal successors, (33), 4 states have internal predecessors, (33), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2021-12-17 21:50:16,300 INFO L276 IsEmpty]: Start isEmpty. Operand 219 states and 350 transitions. [2021-12-17 21:50:16,301 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2021-12-17 21:50:16,301 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 21:50:16,301 INFO L514 BasicCegarLoop]: trace histogram [24, 24, 23, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-17 21:50:16,321 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (19)] Ended with exit code 0 [2021-12-17 21:50:16,510 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-17 21:50:16,510 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 21:50:16,510 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 21:50:16,511 INFO L85 PathProgramCache]: Analyzing trace with hash -80179142, now seen corresponding path program 1 times [2021-12-17 21:50:16,511 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-17 21:50:16,511 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [287584532] [2021-12-17 21:50:16,511 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 21:50:16,511 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-17 21:50:16,512 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-17 21:50:16,513 INFO L229 MonitoredProcess]: Starting monitored process 20 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-17 21:50:16,515 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (20)] Waiting until timeout for monitored process [2021-12-17 21:50:16,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 21:50:16,574 INFO L263 TraceCheckSpWp]: Trace formula consists of 216 conjuncts, 5 conjunts are in the unsatisfiable core [2021-12-17 21:50:16,575 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-17 21:50:16,974 INFO L134 CoverageAnalysis]: Checked inductivity of 860 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 851 trivial. 0 not checked. [2021-12-17 21:50:16,974 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-17 21:50:17,349 INFO L134 CoverageAnalysis]: Checked inductivity of 860 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 851 trivial. 0 not checked. [2021-12-17 21:50:17,349 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-17 21:50:17,349 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [287584532] [2021-12-17 21:50:17,350 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [287584532] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-17 21:50:17,350 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-17 21:50:17,350 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 6 [2021-12-17 21:50:17,350 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1855477861] [2021-12-17 21:50:17,350 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-17 21:50:17,350 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-12-17 21:50:17,350 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-17 21:50:17,350 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-12-17 21:50:17,350 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-12-17 21:50:17,351 INFO L87 Difference]: Start difference. First operand 219 states and 350 transitions. Second operand has 6 states, 6 states have (on average 6.0) internal successors, (36), 5 states have internal predecessors, (36), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2021-12-17 21:50:17,550 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-17 21:50:17,550 INFO L93 Difference]: Finished difference Result 250 states and 398 transitions. [2021-12-17 21:50:17,550 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-17 21:50:17,551 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 6.0) internal successors, (36), 5 states have internal predecessors, (36), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) Word has length 122 [2021-12-17 21:50:17,551 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-17 21:50:17,552 INFO L225 Difference]: With dead ends: 250 [2021-12-17 21:50:17,553 INFO L226 Difference]: Without dead ends: 245 [2021-12-17 21:50:17,553 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 243 GetRequests, 237 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-12-17 21:50:17,553 INFO L933 BasicCegarLoop]: 59 mSDtfsCounter, 19 mSDsluCounter, 227 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 286 SdHoareTripleChecker+Invalid, 37 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-17 21:50:17,553 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 286 Invalid, 37 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-17 21:50:17,554 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 245 states. [2021-12-17 21:50:17,572 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 245 to 242. [2021-12-17 21:50:17,572 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 242 states, 226 states have (on average 1.5309734513274336) internal successors, (346), 227 states have internal predecessors, (346), 9 states have call successors, (9), 3 states have call predecessors, (9), 6 states have return successors, (34), 11 states have call predecessors, (34), 8 states have call successors, (34) [2021-12-17 21:50:17,573 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 242 states to 242 states and 389 transitions. [2021-12-17 21:50:17,573 INFO L78 Accepts]: Start accepts. Automaton has 242 states and 389 transitions. Word has length 122 [2021-12-17 21:50:17,574 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-17 21:50:17,574 INFO L470 AbstractCegarLoop]: Abstraction has 242 states and 389 transitions. [2021-12-17 21:50:17,574 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 6.0) internal successors, (36), 5 states have internal predecessors, (36), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2021-12-17 21:50:17,574 INFO L276 IsEmpty]: Start isEmpty. Operand 242 states and 389 transitions. [2021-12-17 21:50:17,575 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2021-12-17 21:50:17,575 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 21:50:17,575 INFO L514 BasicCegarLoop]: trace histogram [24, 24, 23, 4, 4, 4, 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] [2021-12-17 21:50:17,599 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (20)] Forceful destruction successful, exit code 0 [2021-12-17 21:50:17,783 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-17 21:50:17,783 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 21:50:17,784 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 21:50:17,784 INFO L85 PathProgramCache]: Analyzing trace with hash 1019638336, now seen corresponding path program 1 times [2021-12-17 21:50:17,784 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-17 21:50:17,784 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [404045382] [2021-12-17 21:50:17,784 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 21:50:17,784 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-17 21:50:17,785 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-17 21:50:17,785 INFO L229 MonitoredProcess]: Starting monitored process 21 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-17 21:50:17,787 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (21)] Waiting until timeout for monitored process [2021-12-17 21:50:17,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 21:50:17,844 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 4 conjunts are in the unsatisfiable core [2021-12-17 21:50:17,845 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-17 21:50:18,113 INFO L134 CoverageAnalysis]: Checked inductivity of 860 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 860 trivial. 0 not checked. [2021-12-17 21:50:18,114 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-17 21:50:18,114 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-17 21:50:18,114 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [404045382] [2021-12-17 21:50:18,114 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [404045382] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-17 21:50:18,114 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-17 21:50:18,114 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-12-17 21:50:18,114 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1743745540] [2021-12-17 21:50:18,114 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-17 21:50:18,114 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-12-17 21:50:18,114 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-17 21:50:18,115 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-12-17 21:50:18,115 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-12-17 21:50:18,115 INFO L87 Difference]: Start difference. First operand 242 states and 389 transitions. Second operand has 5 states, 5 states have (on average 7.0) internal successors, (35), 5 states have internal predecessors, (35), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2021-12-17 21:50:18,317 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-17 21:50:18,317 INFO L93 Difference]: Finished difference Result 265 states and 413 transitions. [2021-12-17 21:50:18,318 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-12-17 21:50:18,318 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 7.0) internal successors, (35), 5 states have internal predecessors, (35), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) Word has length 124 [2021-12-17 21:50:18,318 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-17 21:50:18,319 INFO L225 Difference]: With dead ends: 265 [2021-12-17 21:50:18,319 INFO L226 Difference]: Without dead ends: 259 [2021-12-17 21:50:18,319 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 120 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-12-17 21:50:18,320 INFO L933 BasicCegarLoop]: 58 mSDtfsCounter, 22 mSDsluCounter, 171 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 229 SdHoareTripleChecker+Invalid, 22 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-17 21:50:18,320 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [22 Valid, 229 Invalid, 22 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-17 21:50:18,320 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 259 states. [2021-12-17 21:50:18,352 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 259 to 257. [2021-12-17 21:50:18,352 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 257 states, 241 states have (on average 1.5020746887966805) internal successors, (362), 242 states have internal predecessors, (362), 9 states have call successors, (9), 3 states have call predecessors, (9), 6 states have return successors, (34), 11 states have call predecessors, (34), 8 states have call successors, (34) [2021-12-17 21:50:18,353 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 257 states to 257 states and 405 transitions. [2021-12-17 21:50:18,353 INFO L78 Accepts]: Start accepts. Automaton has 257 states and 405 transitions. Word has length 124 [2021-12-17 21:50:18,354 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-17 21:50:18,354 INFO L470 AbstractCegarLoop]: Abstraction has 257 states and 405 transitions. [2021-12-17 21:50:18,354 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 7.0) internal successors, (35), 5 states have internal predecessors, (35), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2021-12-17 21:50:18,354 INFO L276 IsEmpty]: Start isEmpty. Operand 257 states and 405 transitions. [2021-12-17 21:50:18,355 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2021-12-17 21:50:18,355 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 21:50:18,355 INFO L514 BasicCegarLoop]: trace histogram [24, 24, 23, 4, 4, 4, 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] [2021-12-17 21:50:18,364 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (21)] Forceful destruction successful, exit code 0 [2021-12-17 21:50:18,563 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-17 21:50:18,563 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 21:50:18,564 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 21:50:18,564 INFO L85 PathProgramCache]: Analyzing trace with hash 1076896638, now seen corresponding path program 1 times [2021-12-17 21:50:18,564 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-17 21:50:18,564 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1440041589] [2021-12-17 21:50:18,564 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 21:50:18,564 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-17 21:50:18,564 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-17 21:50:18,565 INFO L229 MonitoredProcess]: Starting monitored process 22 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-17 21:50:18,566 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (22)] Waiting until timeout for monitored process [2021-12-17 21:50:18,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 21:50:18,628 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 5 conjunts are in the unsatisfiable core [2021-12-17 21:50:18,629 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-17 21:50:18,918 INFO L134 CoverageAnalysis]: Checked inductivity of 860 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 860 trivial. 0 not checked. [2021-12-17 21:50:18,918 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-17 21:50:18,918 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-17 21:50:18,918 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1440041589] [2021-12-17 21:50:18,918 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1440041589] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-17 21:50:18,919 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-17 21:50:18,919 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-12-17 21:50:18,919 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [589166849] [2021-12-17 21:50:18,919 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-17 21:50:18,919 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-12-17 21:50:18,919 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-17 21:50:18,919 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-12-17 21:50:18,919 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-12-17 21:50:18,919 INFO L87 Difference]: Start difference. First operand 257 states and 405 transitions. Second operand has 6 states, 5 states have (on average 7.0) internal successors, (35), 5 states have internal predecessors, (35), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2021-12-17 21:50:19,083 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-17 21:50:19,083 INFO L93 Difference]: Finished difference Result 263 states and 410 transitions. [2021-12-17 21:50:19,083 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-17 21:50:19,083 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 7.0) internal successors, (35), 5 states have internal predecessors, (35), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) Word has length 124 [2021-12-17 21:50:19,084 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-17 21:50:19,085 INFO L225 Difference]: With dead ends: 263 [2021-12-17 21:50:19,085 INFO L226 Difference]: Without dead ends: 246 [2021-12-17 21:50:19,085 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 119 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-12-17 21:50:19,085 INFO L933 BasicCegarLoop]: 61 mSDtfsCounter, 2 mSDsluCounter, 237 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 298 SdHoareTripleChecker+Invalid, 16 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-17 21:50:19,086 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 298 Invalid, 16 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 16 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-17 21:50:19,086 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 246 states. [2021-12-17 21:50:19,106 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 246 to 244. [2021-12-17 21:50:19,107 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 244 states, 229 states have (on average 1.5109170305676856) internal successors, (346), 231 states have internal predecessors, (346), 8 states have call successors, (8), 3 states have call predecessors, (8), 6 states have return successors, (28), 9 states have call predecessors, (28), 7 states have call successors, (28) [2021-12-17 21:50:19,108 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 244 states to 244 states and 382 transitions. [2021-12-17 21:50:19,108 INFO L78 Accepts]: Start accepts. Automaton has 244 states and 382 transitions. Word has length 124 [2021-12-17 21:50:19,108 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-17 21:50:19,108 INFO L470 AbstractCegarLoop]: Abstraction has 244 states and 382 transitions. [2021-12-17 21:50:19,109 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 7.0) internal successors, (35), 5 states have internal predecessors, (35), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2021-12-17 21:50:19,109 INFO L276 IsEmpty]: Start isEmpty. Operand 244 states and 382 transitions. [2021-12-17 21:50:19,109 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2021-12-17 21:50:19,109 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 21:50:19,110 INFO L514 BasicCegarLoop]: trace histogram [24, 24, 23, 4, 4, 4, 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] [2021-12-17 21:50:19,133 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (22)] Forceful destruction successful, exit code 0 [2021-12-17 21:50:19,315 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-17 21:50:19,315 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 21:50:19,316 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 21:50:19,316 INFO L85 PathProgramCache]: Analyzing trace with hash 1258657602, now seen corresponding path program 1 times [2021-12-17 21:50:19,316 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-17 21:50:19,316 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [370313148] [2021-12-17 21:50:19,316 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 21:50:19,316 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-17 21:50:19,316 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-17 21:50:19,317 INFO L229 MonitoredProcess]: Starting monitored process 23 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-17 21:50:19,318 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (23)] Waiting until timeout for monitored process [2021-12-17 21:50:19,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 21:50:19,382 INFO L263 TraceCheckSpWp]: Trace formula consists of 223 conjuncts, 9 conjunts are in the unsatisfiable core [2021-12-17 21:50:19,383 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-17 21:50:19,838 INFO L134 CoverageAnalysis]: Checked inductivity of 860 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 851 trivial. 0 not checked. [2021-12-17 21:50:19,838 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-17 21:50:20,239 INFO L134 CoverageAnalysis]: Checked inductivity of 860 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 851 trivial. 0 not checked. [2021-12-17 21:50:20,239 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-17 21:50:20,240 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [370313148] [2021-12-17 21:50:20,240 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [370313148] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-17 21:50:20,240 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-17 21:50:20,240 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 8 [2021-12-17 21:50:20,240 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [640870315] [2021-12-17 21:50:20,240 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-17 21:50:20,240 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-12-17 21:50:20,240 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-17 21:50:20,240 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-12-17 21:50:20,240 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-12-17 21:50:20,241 INFO L87 Difference]: Start difference. First operand 244 states and 382 transitions. Second operand has 8 states, 8 states have (on average 4.875) internal successors, (39), 7 states have internal predecessors, (39), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2021-12-17 21:50:20,647 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-17 21:50:20,647 INFO L93 Difference]: Finished difference Result 260 states and 397 transitions. [2021-12-17 21:50:20,648 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-12-17 21:50:20,648 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.875) internal successors, (39), 7 states have internal predecessors, (39), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) Word has length 125 [2021-12-17 21:50:20,648 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-17 21:50:20,649 INFO L225 Difference]: With dead ends: 260 [2021-12-17 21:50:20,649 INFO L226 Difference]: Without dead ends: 234 [2021-12-17 21:50:20,650 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 252 GetRequests, 241 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2021-12-17 21:50:20,650 INFO L933 BasicCegarLoop]: 59 mSDtfsCounter, 12 mSDsluCounter, 342 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 401 SdHoareTripleChecker+Invalid, 47 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-17 21:50:20,650 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 401 Invalid, 47 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 43 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-17 21:50:20,651 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 234 states. [2021-12-17 21:50:20,671 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 234 to 226. [2021-12-17 21:50:20,671 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 226 states, 212 states have (on average 1.528301886792453) internal successors, (324), 215 states have internal predecessors, (324), 7 states have call successors, (7), 3 states have call predecessors, (7), 6 states have return successors, (19), 7 states have call predecessors, (19), 6 states have call successors, (19) [2021-12-17 21:50:20,672 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 226 states to 226 states and 350 transitions. [2021-12-17 21:50:20,672 INFO L78 Accepts]: Start accepts. Automaton has 226 states and 350 transitions. Word has length 125 [2021-12-17 21:50:20,673 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-17 21:50:20,673 INFO L470 AbstractCegarLoop]: Abstraction has 226 states and 350 transitions. [2021-12-17 21:50:20,673 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 4.875) internal successors, (39), 7 states have internal predecessors, (39), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2021-12-17 21:50:20,673 INFO L276 IsEmpty]: Start isEmpty. Operand 226 states and 350 transitions. [2021-12-17 21:50:20,674 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2021-12-17 21:50:20,674 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 21:50:20,674 INFO L514 BasicCegarLoop]: trace histogram [24, 24, 23, 4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-17 21:50:20,685 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (23)] Forceful destruction successful, exit code 0 [2021-12-17 21:50:20,883 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-17 21:50:20,884 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 21:50:20,884 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 21:50:20,884 INFO L85 PathProgramCache]: Analyzing trace with hash 1209150703, now seen corresponding path program 2 times [2021-12-17 21:50:20,884 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-17 21:50:20,884 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1585952958] [2021-12-17 21:50:20,884 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-17 21:50:20,885 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-17 21:50:20,885 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-17 21:50:20,886 INFO L229 MonitoredProcess]: Starting monitored process 24 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-17 21:50:20,887 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (24)] Waiting until timeout for monitored process [2021-12-17 21:50:20,928 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2021-12-17 21:50:20,928 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-17 21:50:20,930 INFO L263 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 6 conjunts are in the unsatisfiable core [2021-12-17 21:50:20,931 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-17 21:50:21,238 INFO L134 CoverageAnalysis]: Checked inductivity of 866 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 866 trivial. 0 not checked. [2021-12-17 21:50:21,239 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-17 21:50:21,239 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-17 21:50:21,239 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1585952958] [2021-12-17 21:50:21,239 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1585952958] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-17 21:50:21,239 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-17 21:50:21,239 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-12-17 21:50:21,239 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1517856070] [2021-12-17 21:50:21,239 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-17 21:50:21,239 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-12-17 21:50:21,239 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-17 21:50:21,240 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-12-17 21:50:21,240 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-12-17 21:50:21,240 INFO L87 Difference]: Start difference. First operand 226 states and 350 transitions. Second operand has 5 states, 5 states have (on average 6.6) internal successors, (33), 5 states have internal predecessors, (33), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2021-12-17 21:50:21,486 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-17 21:50:21,486 INFO L93 Difference]: Finished difference Result 262 states and 392 transitions. [2021-12-17 21:50:21,487 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-12-17 21:50:21,487 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 6.6) internal successors, (33), 5 states have internal predecessors, (33), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) Word has length 126 [2021-12-17 21:50:21,487 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-17 21:50:21,488 INFO L225 Difference]: With dead ends: 262 [2021-12-17 21:50:21,488 INFO L226 Difference]: Without dead ends: 250 [2021-12-17 21:50:21,488 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 122 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-12-17 21:50:21,489 INFO L933 BasicCegarLoop]: 75 mSDtfsCounter, 53 mSDsluCounter, 178 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 253 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-17 21:50:21,489 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [53 Valid, 253 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-17 21:50:21,489 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 250 states. [2021-12-17 21:50:21,504 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 250 to 227. [2021-12-17 21:50:21,504 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 227 states, 213 states have (on average 1.5258215962441315) internal successors, (325), 216 states have internal predecessors, (325), 7 states have call successors, (7), 3 states have call predecessors, (7), 6 states have return successors, (19), 7 states have call predecessors, (19), 6 states have call successors, (19) [2021-12-17 21:50:21,505 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 227 states to 227 states and 351 transitions. [2021-12-17 21:50:21,505 INFO L78 Accepts]: Start accepts. Automaton has 227 states and 351 transitions. Word has length 126 [2021-12-17 21:50:21,506 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-17 21:50:21,506 INFO L470 AbstractCegarLoop]: Abstraction has 227 states and 351 transitions. [2021-12-17 21:50:21,506 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 6.6) internal successors, (33), 5 states have internal predecessors, (33), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2021-12-17 21:50:21,506 INFO L276 IsEmpty]: Start isEmpty. Operand 227 states and 351 transitions. [2021-12-17 21:50:21,507 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2021-12-17 21:50:21,507 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 21:50:21,507 INFO L514 BasicCegarLoop]: trace histogram [24, 24, 23, 4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-17 21:50:21,514 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (24)] Ended with exit code 0 [2021-12-17 21:50:21,714 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-17 21:50:21,714 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 21:50:21,715 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 21:50:21,715 INFO L85 PathProgramCache]: Analyzing trace with hash 622344689, now seen corresponding path program 1 times [2021-12-17 21:50:21,715 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-17 21:50:21,715 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1998266537] [2021-12-17 21:50:21,715 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 21:50:21,715 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-17 21:50:21,715 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-17 21:50:21,716 INFO L229 MonitoredProcess]: Starting monitored process 25 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-17 21:50:21,718 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (25)] Waiting until timeout for monitored process [2021-12-17 21:50:21,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 21:50:21,778 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 62 conjunts are in the unsatisfiable core [2021-12-17 21:50:21,780 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-17 21:50:29,489 INFO L134 CoverageAnalysis]: Checked inductivity of 866 backedges. 4 proven. 840 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-12-17 21:50:29,490 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-17 21:50:44,305 INFO L134 CoverageAnalysis]: Checked inductivity of 866 backedges. 4 proven. 840 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-12-17 21:50:44,305 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-17 21:50:44,305 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1998266537] [2021-12-17 21:50:44,305 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1998266537] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-17 21:50:44,305 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-17 21:50:44,305 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33] total 64 [2021-12-17 21:50:44,305 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1784885088] [2021-12-17 21:50:44,305 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-17 21:50:44,306 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 64 states [2021-12-17 21:50:44,306 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-17 21:50:44,306 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2021-12-17 21:50:44,306 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=763, Invalid=3269, Unknown=0, NotChecked=0, Total=4032 [2021-12-17 21:50:44,307 INFO L87 Difference]: Start difference. First operand 227 states and 351 transitions. Second operand has 64 states, 64 states have (on average 3.0) internal successors, (192), 62 states have internal predecessors, (192), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (7), 5 states have call predecessors, (7), 3 states have call successors, (7) [2021-12-17 21:53:02,763 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-17 21:53:02,763 INFO L93 Difference]: Finished difference Result 602 states and 890 transitions. [2021-12-17 21:53:02,764 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 159 states. [2021-12-17 21:53:02,764 INFO L78 Accepts]: Start accepts. Automaton has has 64 states, 64 states have (on average 3.0) internal successors, (192), 62 states have internal predecessors, (192), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (7), 5 states have call predecessors, (7), 3 states have call successors, (7) Word has length 126 [2021-12-17 21:53:02,770 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-17 21:53:02,772 INFO L225 Difference]: With dead ends: 602 [2021-12-17 21:53:02,772 INFO L226 Difference]: Without dead ends: 587 [2021-12-17 21:53:02,776 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 401 GetRequests, 216 SyntacticMatches, 0 SemanticMatches, 185 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10219 ImplicationChecksByTransitivity, 117.9s TimeCoverageRelationStatistics Valid=8299, Invalid=26483, Unknown=0, NotChecked=0, Total=34782 [2021-12-17 21:53:02,777 INFO L933 BasicCegarLoop]: 157 mSDtfsCounter, 2332 mSDsluCounter, 5110 mSDsCounter, 0 mSdLazyCounter, 7544 mSolverCounterSat, 1363 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 34.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2332 SdHoareTripleChecker+Valid, 5267 SdHoareTripleChecker+Invalid, 8907 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 1363 IncrementalHoareTripleChecker+Valid, 7544 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 36.7s IncrementalHoareTripleChecker+Time [2021-12-17 21:53:02,777 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2332 Valid, 5267 Invalid, 8907 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [1363 Valid, 7544 Invalid, 0 Unknown, 0 Unchecked, 36.7s Time] [2021-12-17 21:53:02,779 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 587 states. [2021-12-17 21:53:02,818 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 587 to 229. [2021-12-17 21:53:02,819 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 229 states, 215 states have (on average 1.5255813953488373) internal successors, (328), 217 states have internal predecessors, (328), 7 states have call successors, (7), 3 states have call predecessors, (7), 6 states have return successors, (19), 8 states have call predecessors, (19), 6 states have call successors, (19) [2021-12-17 21:53:02,820 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 229 states to 229 states and 354 transitions. [2021-12-17 21:53:02,820 INFO L78 Accepts]: Start accepts. Automaton has 229 states and 354 transitions. Word has length 126 [2021-12-17 21:53:02,820 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-17 21:53:02,820 INFO L470 AbstractCegarLoop]: Abstraction has 229 states and 354 transitions. [2021-12-17 21:53:02,820 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 64 states, 64 states have (on average 3.0) internal successors, (192), 62 states have internal predecessors, (192), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (7), 5 states have call predecessors, (7), 3 states have call successors, (7) [2021-12-17 21:53:02,821 INFO L276 IsEmpty]: Start isEmpty. Operand 229 states and 354 transitions. [2021-12-17 21:53:02,821 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2021-12-17 21:53:02,821 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 21:53:02,821 INFO L514 BasicCegarLoop]: trace histogram [24, 24, 23, 4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-17 21:53:02,830 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (25)] Forceful destruction successful, exit code 0 [2021-12-17 21:53:03,029 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-17 21:53:03,030 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 21:53:03,030 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 21:53:03,030 INFO L85 PathProgramCache]: Analyzing trace with hash 1341851559, now seen corresponding path program 1 times [2021-12-17 21:53:03,030 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-17 21:53:03,030 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1480447242] [2021-12-17 21:53:03,030 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 21:53:03,030 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-17 21:53:03,031 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-17 21:53:03,031 INFO L229 MonitoredProcess]: Starting monitored process 26 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-17 21:53:03,032 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (26)] Waiting until timeout for monitored process [2021-12-17 21:53:03,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 21:53:03,103 INFO L263 TraceCheckSpWp]: Trace formula consists of 226 conjuncts, 68 conjunts are in the unsatisfiable core [2021-12-17 21:53:03,104 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-17 21:53:12,120 INFO L134 CoverageAnalysis]: Checked inductivity of 866 backedges. 4 proven. 840 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-12-17 21:53:12,120 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-17 21:53:15,234 INFO L134 CoverageAnalysis]: Checked inductivity of 866 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 866 trivial. 0 not checked. [2021-12-17 21:53:15,234 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-17 21:53:15,234 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1480447242] [2021-12-17 21:53:15,234 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1480447242] provided 1 perfect and 1 imperfect interpolant sequences [2021-12-17 21:53:15,234 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-12-17 21:53:15,234 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [37] total 41 [2021-12-17 21:53:15,234 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [635649240] [2021-12-17 21:53:15,234 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-17 21:53:15,235 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-12-17 21:53:15,235 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-17 21:53:15,235 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-12-17 21:53:15,235 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=1546, Unknown=0, NotChecked=0, Total=1640 [2021-12-17 21:53:15,235 INFO L87 Difference]: Start difference. First operand 229 states and 354 transitions. Second operand has 6 states, 6 states have (on average 5.666666666666667) internal successors, (34), 6 states have internal predecessors, (34), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2021-12-17 21:53:16,348 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-17 21:53:16,348 INFO L93 Difference]: Finished difference Result 245 states and 370 transitions. [2021-12-17 21:53:16,349 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-12-17 21:53:16,349 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 5.666666666666667) internal successors, (34), 6 states have internal predecessors, (34), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) Word has length 127 [2021-12-17 21:53:16,349 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-17 21:53:16,350 INFO L225 Difference]: With dead ends: 245 [2021-12-17 21:53:16,350 INFO L226 Difference]: Without dead ends: 240 [2021-12-17 21:53:16,351 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 255 GetRequests, 213 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 9.4s TimeCoverageRelationStatistics Valid=112, Invalid=1780, Unknown=0, NotChecked=0, Total=1892 [2021-12-17 21:53:16,351 INFO L933 BasicCegarLoop]: 63 mSDtfsCounter, 25 mSDsluCounter, 206 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 269 SdHoareTripleChecker+Invalid, 50 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-17 21:53:16,351 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [25 Valid, 269 Invalid, 50 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 47 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-17 21:53:16,352 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 240 states. [2021-12-17 21:53:16,374 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 240 to 236. [2021-12-17 21:53:16,374 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 236 states, 222 states have (on average 1.509009009009009) internal successors, (335), 224 states have internal predecessors, (335), 7 states have call successors, (7), 3 states have call predecessors, (7), 6 states have return successors, (19), 8 states have call predecessors, (19), 6 states have call successors, (19) [2021-12-17 21:53:16,375 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 236 states to 236 states and 361 transitions. [2021-12-17 21:53:16,375 INFO L78 Accepts]: Start accepts. Automaton has 236 states and 361 transitions. Word has length 127 [2021-12-17 21:53:16,375 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-17 21:53:16,376 INFO L470 AbstractCegarLoop]: Abstraction has 236 states and 361 transitions. [2021-12-17 21:53:16,376 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 5.666666666666667) internal successors, (34), 6 states have internal predecessors, (34), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2021-12-17 21:53:16,376 INFO L276 IsEmpty]: Start isEmpty. Operand 236 states and 361 transitions. [2021-12-17 21:53:16,376 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2021-12-17 21:53:16,376 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 21:53:16,377 INFO L514 BasicCegarLoop]: trace histogram [24, 24, 23, 4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-17 21:53:16,401 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (26)] Forceful destruction successful, exit code 0 [2021-12-17 21:53:16,584 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-17 21:53:16,585 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 21:53:16,585 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 21:53:16,585 INFO L85 PathProgramCache]: Analyzing trace with hash 1806024394, now seen corresponding path program 1 times [2021-12-17 21:53:16,586 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-17 21:53:16,586 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1519014911] [2021-12-17 21:53:16,586 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 21:53:16,586 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-17 21:53:16,586 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-17 21:53:16,587 INFO L229 MonitoredProcess]: Starting monitored process 27 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-17 21:53:16,588 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (27)] Waiting until timeout for monitored process [2021-12-17 21:53:16,647 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 21:53:16,653 INFO L263 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 65 conjunts are in the unsatisfiable core [2021-12-17 21:53:16,655 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-17 21:53:25,320 INFO L134 CoverageAnalysis]: Checked inductivity of 866 backedges. 4 proven. 840 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-12-17 21:53:25,321 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-17 21:53:27,842 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-17 21:53:27,842 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1519014911] [2021-12-17 21:53:27,842 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1519014911] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-17 21:53:27,842 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1289044362] [2021-12-17 21:53:27,842 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 21:53:27,843 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-17 21:53:27,843 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2021-12-17 21:53:27,844 INFO L229 MonitoredProcess]: Starting monitored process 28 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-12-17 21:53:27,845 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (28)] Waiting until timeout for monitored process [2021-12-17 21:53:27,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 21:53:27,975 INFO L263 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 69 conjunts are in the unsatisfiable core [2021-12-17 21:53:27,977 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-17 21:53:31,308 INFO L134 CoverageAnalysis]: Checked inductivity of 866 backedges. 4 proven. 840 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-12-17 21:53:31,309 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-17 21:53:35,045 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1289044362] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-17 21:53:35,045 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-17 21:53:35,045 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35] total 38 [2021-12-17 21:53:35,045 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [266829056] [2021-12-17 21:53:35,045 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-17 21:53:35,045 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2021-12-17 21:53:35,045 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-17 21:53:35,045 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-12-17 21:53:35,046 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=167, Invalid=2185, Unknown=0, NotChecked=0, Total=2352 [2021-12-17 21:53:35,046 INFO L87 Difference]: Start difference. First operand 236 states and 361 transitions. Second operand has 38 states, 38 states have (on average 3.026315789473684) internal successors, (115), 37 states have internal predecessors, (115), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2021-12-17 21:54:01,783 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-17 21:54:01,783 INFO L93 Difference]: Finished difference Result 397 states and 549 transitions. [2021-12-17 21:54:01,784 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-12-17 21:54:01,784 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 3.026315789473684) internal successors, (115), 37 states have internal predecessors, (115), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) Word has length 128 [2021-12-17 21:54:01,785 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-17 21:54:01,786 INFO L225 Difference]: With dead ends: 397 [2021-12-17 21:54:01,786 INFO L226 Difference]: Without dead ends: 385 [2021-12-17 21:54:01,787 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 290 GetRequests, 240 SyntacticMatches, 1 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 149 ImplicationChecksByTransitivity, 14.2s TimeCoverageRelationStatistics Valid=184, Invalid=2366, Unknown=0, NotChecked=0, Total=2550 [2021-12-17 21:54:01,787 INFO L933 BasicCegarLoop]: 145 mSDtfsCounter, 160 mSDsluCounter, 4066 mSDsCounter, 0 mSdLazyCounter, 5311 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 24.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 160 SdHoareTripleChecker+Valid, 4211 SdHoareTripleChecker+Invalid, 5527 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 5311 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 215 IncrementalHoareTripleChecker+Unchecked, 25.9s IncrementalHoareTripleChecker+Time [2021-12-17 21:54:01,787 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [160 Valid, 4211 Invalid, 5527 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 5311 Invalid, 0 Unknown, 215 Unchecked, 25.9s Time] [2021-12-17 21:54:01,788 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 385 states. [2021-12-17 21:54:01,805 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 385 to 249. [2021-12-17 21:54:01,806 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 249 states, 232 states have (on average 1.4956896551724137) internal successors, (347), 234 states have internal predecessors, (347), 9 states have call successors, (9), 3 states have call predecessors, (9), 7 states have return successors, (32), 11 states have call predecessors, (32), 8 states have call successors, (32) [2021-12-17 21:54:01,807 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 249 states to 249 states and 388 transitions. [2021-12-17 21:54:01,807 INFO L78 Accepts]: Start accepts. Automaton has 249 states and 388 transitions. Word has length 128 [2021-12-17 21:54:01,808 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-17 21:54:01,808 INFO L470 AbstractCegarLoop]: Abstraction has 249 states and 388 transitions. [2021-12-17 21:54:01,808 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 3.026315789473684) internal successors, (115), 37 states have internal predecessors, (115), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2021-12-17 21:54:01,808 INFO L276 IsEmpty]: Start isEmpty. Operand 249 states and 388 transitions. [2021-12-17 21:54:01,809 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2021-12-17 21:54:01,809 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 21:54:01,809 INFO L514 BasicCegarLoop]: trace histogram [24, 24, 23, 4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-17 21:54:01,813 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (28)] Ended with exit code 0 [2021-12-17 21:54:02,020 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (27)] Forceful destruction successful, exit code 0 [2021-12-17 21:54:02,211 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt,27 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-17 21:54:02,212 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 21:54:02,212 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 21:54:02,212 INFO L85 PathProgramCache]: Analyzing trace with hash 526160716, now seen corresponding path program 1 times [2021-12-17 21:54:02,212 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-17 21:54:02,212 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [538298251] [2021-12-17 21:54:02,212 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 21:54:02,212 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-17 21:54:02,213 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-17 21:54:02,214 INFO L229 MonitoredProcess]: Starting monitored process 29 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-17 21:54:02,215 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (29)] Waiting until timeout for monitored process [2021-12-17 21:54:02,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 21:54:02,291 INFO L263 TraceCheckSpWp]: Trace formula consists of 224 conjuncts, 65 conjunts are in the unsatisfiable core [2021-12-17 21:54:02,293 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-17 21:54:10,981 INFO L134 CoverageAnalysis]: Checked inductivity of 866 backedges. 4 proven. 840 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-12-17 21:54:10,981 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-17 21:54:13,353 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-17 21:54:13,354 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [538298251] [2021-12-17 21:54:13,354 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [538298251] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-17 21:54:13,354 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1870447006] [2021-12-17 21:54:13,354 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 21:54:13,354 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-17 21:54:13,354 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2021-12-17 21:54:13,355 INFO L229 MonitoredProcess]: Starting monitored process 30 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-12-17 21:54:13,356 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (30)] Waiting until timeout for monitored process [2021-12-17 21:54:13,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 21:54:13,503 INFO L263 TraceCheckSpWp]: Trace formula consists of 224 conjuncts, 66 conjunts are in the unsatisfiable core [2021-12-17 21:54:13,505 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-17 21:54:15,654 INFO L134 CoverageAnalysis]: Checked inductivity of 866 backedges. 4 proven. 840 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-12-17 21:54:15,654 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-17 21:54:19,489 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1870447006] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-17 21:54:19,489 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-17 21:54:19,489 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35] total 35 [2021-12-17 21:54:19,489 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [161414185] [2021-12-17 21:54:19,489 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-17 21:54:19,490 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-12-17 21:54:19,490 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-17 21:54:19,490 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-12-17 21:54:19,490 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=1848, Unknown=0, NotChecked=0, Total=1980 [2021-12-17 21:54:19,490 INFO L87 Difference]: Start difference. First operand 249 states and 388 transitions. Second operand has 35 states, 35 states have (on average 3.085714285714286) internal successors, (108), 34 states have internal predecessors, (108), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2021-12-17 21:54:47,195 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-17 21:54:47,195 INFO L93 Difference]: Finished difference Result 390 states and 541 transitions. [2021-12-17 21:54:47,196 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-12-17 21:54:47,196 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 3.085714285714286) internal successors, (108), 34 states have internal predecessors, (108), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) Word has length 128 [2021-12-17 21:54:47,196 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-17 21:54:47,197 INFO L225 Difference]: With dead ends: 390 [2021-12-17 21:54:47,197 INFO L226 Difference]: Without dead ends: 378 [2021-12-17 21:54:47,198 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 290 GetRequests, 243 SyntacticMatches, 2 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 94 ImplicationChecksByTransitivity, 12.9s TimeCoverageRelationStatistics Valid=149, Invalid=2013, Unknown=0, NotChecked=0, Total=2162 [2021-12-17 21:54:47,198 INFO L933 BasicCegarLoop]: 129 mSDtfsCounter, 133 mSDsluCounter, 3797 mSDsCounter, 0 mSdLazyCounter, 5441 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 25.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 133 SdHoareTripleChecker+Valid, 3926 SdHoareTripleChecker+Invalid, 5841 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 5441 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 399 IncrementalHoareTripleChecker+Unchecked, 26.9s IncrementalHoareTripleChecker+Time [2021-12-17 21:54:47,198 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [133 Valid, 3926 Invalid, 5841 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 5441 Invalid, 0 Unknown, 399 Unchecked, 26.9s Time] [2021-12-17 21:54:47,199 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 378 states. [2021-12-17 21:54:47,223 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 378 to 249. [2021-12-17 21:54:47,223 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 249 states, 232 states have (on average 1.4956896551724137) internal successors, (347), 234 states have internal predecessors, (347), 9 states have call successors, (9), 3 states have call predecessors, (9), 7 states have return successors, (32), 11 states have call predecessors, (32), 8 states have call successors, (32) [2021-12-17 21:54:47,224 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 249 states to 249 states and 388 transitions. [2021-12-17 21:54:47,224 INFO L78 Accepts]: Start accepts. Automaton has 249 states and 388 transitions. Word has length 128 [2021-12-17 21:54:47,225 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-17 21:54:47,225 INFO L470 AbstractCegarLoop]: Abstraction has 249 states and 388 transitions. [2021-12-17 21:54:47,225 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 3.085714285714286) internal successors, (108), 34 states have internal predecessors, (108), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2021-12-17 21:54:47,225 INFO L276 IsEmpty]: Start isEmpty. Operand 249 states and 388 transitions. [2021-12-17 21:54:47,226 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2021-12-17 21:54:47,226 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 21:54:47,226 INFO L514 BasicCegarLoop]: trace histogram [24, 24, 23, 4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-17 21:54:47,246 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (30)] Forceful destruction successful, exit code 0 [2021-12-17 21:54:47,437 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (29)] Forceful destruction successful, exit code 0 [2021-12-17 21:54:47,637 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt,29 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-17 21:54:47,638 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 21:54:47,638 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 21:54:47,638 INFO L85 PathProgramCache]: Analyzing trace with hash 1791541869, now seen corresponding path program 2 times [2021-12-17 21:54:47,638 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-17 21:54:47,638 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1766126978] [2021-12-17 21:54:47,638 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-17 21:54:47,639 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-17 21:54:47,639 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-17 21:54:47,640 INFO L229 MonitoredProcess]: Starting monitored process 31 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-17 21:54:47,640 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (31)] Waiting until timeout for monitored process [2021-12-17 21:54:47,706 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-17 21:54:47,707 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-17 21:54:47,711 INFO L263 TraceCheckSpWp]: Trace formula consists of 228 conjuncts, 68 conjunts are in the unsatisfiable core [2021-12-17 21:54:47,713 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-17 21:54:56,427 INFO L134 CoverageAnalysis]: Checked inductivity of 866 backedges. 4 proven. 840 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-12-17 21:54:56,427 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-17 21:54:58,731 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-17 21:54:58,731 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1766126978] [2021-12-17 21:54:58,731 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1766126978] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-17 21:54:58,731 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [849417221] [2021-12-17 21:54:58,732 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-17 21:54:58,732 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-17 21:54:58,732 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2021-12-17 21:54:58,733 INFO L229 MonitoredProcess]: Starting monitored process 32 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-12-17 21:54:58,734 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (32)] Waiting until timeout for monitored process [2021-12-17 21:54:58,859 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-17 21:54:58,859 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-17 21:54:58,863 INFO L263 TraceCheckSpWp]: Trace formula consists of 228 conjuncts, 68 conjunts are in the unsatisfiable core [2021-12-17 21:54:58,865 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-17 21:55:00,790 INFO L134 CoverageAnalysis]: Checked inductivity of 866 backedges. 4 proven. 840 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-12-17 21:55:00,790 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-17 21:55:01,551 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [849417221] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-17 21:55:01,551 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-17 21:55:01,551 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35] total 35 [2021-12-17 21:55:01,551 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1615587457] [2021-12-17 21:55:01,551 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-17 21:55:01,552 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-12-17 21:55:01,552 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-17 21:55:01,552 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-12-17 21:55:01,552 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=1462, Unknown=0, NotChecked=0, Total=1560 [2021-12-17 21:55:01,552 INFO L87 Difference]: Start difference. First operand 249 states and 388 transitions. Second operand has 35 states, 35 states have (on average 3.1142857142857143) internal successors, (109), 34 states have internal predecessors, (109), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2021-12-17 21:55:29,480 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-17 21:55:29,480 INFO L93 Difference]: Finished difference Result 412 states and 565 transitions. [2021-12-17 21:55:29,481 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-12-17 21:55:29,481 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 3.1142857142857143) internal successors, (109), 34 states have internal predecessors, (109), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) Word has length 129 [2021-12-17 21:55:29,482 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-17 21:55:29,483 INFO L225 Difference]: With dead ends: 412 [2021-12-17 21:55:29,483 INFO L226 Difference]: Without dead ends: 398 [2021-12-17 21:55:29,484 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 295 GetRequests, 253 SyntacticMatches, 1 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 10.1s TimeCoverageRelationStatistics Valid=123, Invalid=1683, Unknown=0, NotChecked=0, Total=1806 [2021-12-17 21:55:29,484 INFO L933 BasicCegarLoop]: 153 mSDtfsCounter, 215 mSDsluCounter, 4187 mSDsCounter, 0 mSdLazyCounter, 5311 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 24.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 215 SdHoareTripleChecker+Valid, 4340 SdHoareTripleChecker+Invalid, 5585 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 5311 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 273 IncrementalHoareTripleChecker+Unchecked, 26.8s IncrementalHoareTripleChecker+Time [2021-12-17 21:55:29,484 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [215 Valid, 4340 Invalid, 5585 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 5311 Invalid, 0 Unknown, 273 Unchecked, 26.8s Time] [2021-12-17 21:55:29,484 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 398 states. [2021-12-17 21:55:29,511 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 398 to 251. [2021-12-17 21:55:29,512 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 251 states, 234 states have (on average 1.4914529914529915) internal successors, (349), 236 states have internal predecessors, (349), 9 states have call successors, (9), 3 states have call predecessors, (9), 7 states have return successors, (32), 11 states have call predecessors, (32), 8 states have call successors, (32) [2021-12-17 21:55:29,512 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 251 states to 251 states and 390 transitions. [2021-12-17 21:55:29,513 INFO L78 Accepts]: Start accepts. Automaton has 251 states and 390 transitions. Word has length 129 [2021-12-17 21:55:29,513 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-17 21:55:29,513 INFO L470 AbstractCegarLoop]: Abstraction has 251 states and 390 transitions. [2021-12-17 21:55:29,513 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 3.1142857142857143) internal successors, (109), 34 states have internal predecessors, (109), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2021-12-17 21:55:29,513 INFO L276 IsEmpty]: Start isEmpty. Operand 251 states and 390 transitions. [2021-12-17 21:55:29,514 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2021-12-17 21:55:29,514 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 21:55:29,514 INFO L514 BasicCegarLoop]: trace histogram [24, 24, 23, 4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-17 21:55:29,535 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (31)] Forceful destruction successful, exit code 0 [2021-12-17 21:55:29,737 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (32)] Forceful destruction successful, exit code 0 [2021-12-17 21:55:29,925 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3,32 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt [2021-12-17 21:55:29,925 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 21:55:29,925 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 21:55:29,926 INFO L85 PathProgramCache]: Analyzing trace with hash 770473515, now seen corresponding path program 1 times [2021-12-17 21:55:29,926 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-17 21:55:29,926 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1378792760] [2021-12-17 21:55:29,926 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 21:55:29,926 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-17 21:55:29,926 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-17 21:55:29,927 INFO L229 MonitoredProcess]: Starting monitored process 33 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-17 21:55:29,928 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (33)] Waiting until timeout for monitored process [2021-12-17 21:55:29,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 21:55:29,994 INFO L263 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 66 conjunts are in the unsatisfiable core [2021-12-17 21:55:29,995 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-17 21:55:39,185 INFO L134 CoverageAnalysis]: Checked inductivity of 866 backedges. 4 proven. 840 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-12-17 21:55:39,185 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-17 21:55:43,064 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-17 21:55:43,064 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1378792760] [2021-12-17 21:55:43,064 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1378792760] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-17 21:55:43,064 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1372850930] [2021-12-17 21:55:43,064 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 21:55:43,064 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-17 21:55:43,065 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2021-12-17 21:55:43,075 INFO L229 MonitoredProcess]: Starting monitored process 34 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-12-17 21:55:43,075 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (34)] Waiting until timeout for monitored process [2021-12-17 21:55:43,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 21:55:43,226 INFO L263 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 66 conjunts are in the unsatisfiable core [2021-12-17 21:55:43,228 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-17 21:55:45,564 INFO L134 CoverageAnalysis]: Checked inductivity of 866 backedges. 4 proven. 840 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-12-17 21:55:45,564 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-17 21:55:46,984 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1372850930] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-17 21:55:46,984 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-17 21:55:46,985 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35] total 35 [2021-12-17 21:55:46,985 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [948857411] [2021-12-17 21:55:46,985 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-17 21:55:46,985 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-12-17 21:55:46,985 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-17 21:55:46,985 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-12-17 21:55:46,985 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=1533, Unknown=0, NotChecked=0, Total=1640 [2021-12-17 21:55:46,986 INFO L87 Difference]: Start difference. First operand 251 states and 390 transitions. Second operand has 35 states, 35 states have (on average 3.1142857142857143) internal successors, (109), 34 states have internal predecessors, (109), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2021-12-17 21:56:15,265 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-17 21:56:15,265 INFO L93 Difference]: Finished difference Result 413 states and 566 transitions. [2021-12-17 21:56:15,266 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-12-17 21:56:15,266 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 3.1142857142857143) internal successors, (109), 34 states have internal predecessors, (109), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) Word has length 129 [2021-12-17 21:56:15,267 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-17 21:56:15,268 INFO L225 Difference]: With dead ends: 413 [2021-12-17 21:56:15,268 INFO L226 Difference]: Without dead ends: 399 [2021-12-17 21:56:15,268 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 294 GetRequests, 250 SyntacticMatches, 3 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 12.5s TimeCoverageRelationStatistics Valid=121, Invalid=1685, Unknown=0, NotChecked=0, Total=1806 [2021-12-17 21:56:15,269 INFO L933 BasicCegarLoop]: 147 mSDtfsCounter, 173 mSDsluCounter, 4127 mSDsCounter, 0 mSdLazyCounter, 5498 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 25.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 173 SdHoareTripleChecker+Valid, 4274 SdHoareTripleChecker+Invalid, 5595 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 5498 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 96 IncrementalHoareTripleChecker+Unchecked, 27.5s IncrementalHoareTripleChecker+Time [2021-12-17 21:56:15,269 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [173 Valid, 4274 Invalid, 5595 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 5498 Invalid, 0 Unknown, 96 Unchecked, 27.5s Time] [2021-12-17 21:56:15,269 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 399 states. [2021-12-17 21:56:15,288 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 399 to 249. [2021-12-17 21:56:15,288 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 249 states, 232 states have (on average 1.4913793103448276) internal successors, (346), 234 states have internal predecessors, (346), 9 states have call successors, (9), 3 states have call predecessors, (9), 7 states have return successors, (32), 11 states have call predecessors, (32), 8 states have call successors, (32) [2021-12-17 21:56:15,297 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 249 states to 249 states and 387 transitions. [2021-12-17 21:56:15,297 INFO L78 Accepts]: Start accepts. Automaton has 249 states and 387 transitions. Word has length 129 [2021-12-17 21:56:15,297 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-17 21:56:15,297 INFO L470 AbstractCegarLoop]: Abstraction has 249 states and 387 transitions. [2021-12-17 21:56:15,297 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 3.1142857142857143) internal successors, (109), 34 states have internal predecessors, (109), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2021-12-17 21:56:15,297 INFO L276 IsEmpty]: Start isEmpty. Operand 249 states and 387 transitions. [2021-12-17 21:56:15,298 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2021-12-17 21:56:15,298 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 21:56:15,298 INFO L514 BasicCegarLoop]: trace histogram [24, 24, 23, 4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-17 21:56:15,315 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (34)] Forceful destruction successful, exit code 0 [2021-12-17 21:56:15,510 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (33)] Forceful destruction successful, exit code 0 [2021-12-17 21:56:15,709 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt,33 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-17 21:56:15,710 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 21:56:15,710 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 21:56:15,710 INFO L85 PathProgramCache]: Analyzing trace with hash 755502598, now seen corresponding path program 1 times [2021-12-17 21:56:15,711 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-17 21:56:15,711 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1990414172] [2021-12-17 21:56:15,711 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 21:56:15,711 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-17 21:56:15,711 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-17 21:56:15,736 INFO L229 MonitoredProcess]: Starting monitored process 35 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-17 21:56:15,739 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (35)] Waiting until timeout for monitored process [2021-12-17 21:56:15,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 21:56:15,852 INFO L263 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 80 conjunts are in the unsatisfiable core [2021-12-17 21:56:15,854 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-17 21:56:51,858 INFO L134 CoverageAnalysis]: Checked inductivity of 866 backedges. 4 proven. 840 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-12-17 21:56:51,858 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-17 21:57:36,326 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-17 21:57:36,326 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1990414172] [2021-12-17 21:57:36,326 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1990414172] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-17 21:57:36,327 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1996920754] [2021-12-17 21:57:36,327 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 21:57:36,327 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-17 21:57:36,327 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2021-12-17 21:57:36,328 INFO L229 MonitoredProcess]: Starting monitored process 36 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-12-17 21:57:36,329 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (36)] Waiting until timeout for monitored process [2021-12-17 21:57:36,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 21:57:36,539 INFO L263 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 100 conjunts are in the unsatisfiable core [2021-12-17 21:57:36,540 INFO L286 TraceCheckSpWp]: Computing forward predicates... Killed by 15