./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/eca-rers2018/Problem11.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 791161d1 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/eca-rers2018/Problem11.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 940624650400628fbc547d76c7cce642a9063fb1576962b71733623b165f113e --- Real Ultimate output --- This is Ultimate 0.2.2-?-791161d [2022-07-22 13:14:48,754 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-07-22 13:14:48,756 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-07-22 13:14:48,797 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-07-22 13:14:48,797 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-07-22 13:14:48,798 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-07-22 13:14:48,799 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-07-22 13:14:48,801 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-07-22 13:14:48,802 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-07-22 13:14:48,803 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-07-22 13:14:48,803 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-07-22 13:14:48,804 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-07-22 13:14:48,805 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-07-22 13:14:48,806 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-07-22 13:14:48,807 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-07-22 13:14:48,808 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-07-22 13:14:48,808 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-07-22 13:14:48,809 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-07-22 13:14:48,810 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-07-22 13:14:48,812 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-07-22 13:14:48,813 INFO L181 SettingsManager]: Resetting HornVerifier preferences to default values [2022-07-22 13:14:48,814 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-07-22 13:14:48,815 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-07-22 13:14:48,816 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-07-22 13:14:48,816 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-07-22 13:14:48,819 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-07-22 13:14:48,819 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-07-22 13:14:48,819 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-07-22 13:14:48,820 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-07-22 13:14:48,820 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-07-22 13:14:48,821 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-07-22 13:14:48,821 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-07-22 13:14:48,822 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-07-22 13:14:48,823 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-07-22 13:14:48,823 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-07-22 13:14:48,824 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-07-22 13:14:48,824 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-07-22 13:14:48,825 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-07-22 13:14:48,825 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-07-22 13:14:48,826 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-07-22 13:14:48,827 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-07-22 13:14:48,828 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-07-22 13:14:48,830 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2022-07-22 13:14:48,853 INFO L113 SettingsManager]: Loading preferences was successful [2022-07-22 13:14:48,862 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-07-22 13:14:48,863 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-07-22 13:14:48,863 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-07-22 13:14:48,864 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-07-22 13:14:48,864 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-07-22 13:14:48,864 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-07-22 13:14:48,865 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-07-22 13:14:48,865 INFO L138 SettingsManager]: * Use SBE=true [2022-07-22 13:14:48,866 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-07-22 13:14:48,866 INFO L138 SettingsManager]: * sizeof long=4 [2022-07-22 13:14:48,866 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-07-22 13:14:48,866 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-07-22 13:14:48,866 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-07-22 13:14:48,867 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-07-22 13:14:48,867 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-07-22 13:14:48,867 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-07-22 13:14:48,867 INFO L138 SettingsManager]: * sizeof long double=12 [2022-07-22 13:14:48,867 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-07-22 13:14:48,868 INFO L138 SettingsManager]: * Use constant arrays=true [2022-07-22 13:14:48,869 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-07-22 13:14:48,869 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-07-22 13:14:48,869 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-07-22 13:14:48,869 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-07-22 13:14:48,869 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-07-22 13:14:48,870 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-07-22 13:14:48,870 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-07-22 13:14:48,870 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-07-22 13:14:48,870 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2022-07-22 13:14:48,870 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-07-22 13:14:48,871 INFO L138 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2022-07-22 13:14:48,871 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2022-07-22 13:14:48,871 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-07-22 13:14:48,871 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 940624650400628fbc547d76c7cce642a9063fb1576962b71733623b165f113e [2022-07-22 13:14:49,099 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-07-22 13:14:49,126 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-07-22 13:14:49,129 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-07-22 13:14:49,130 INFO L271 PluginConnector]: Initializing CDTParser... [2022-07-22 13:14:49,130 INFO L275 PluginConnector]: CDTParser initialized [2022-07-22 13:14:49,132 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/eca-rers2018/Problem11.c [2022-07-22 13:14:49,192 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6288dd149/4e4e92cebc9e479689c21b4a11c563e0/FLAG0c91c149f [2022-07-22 13:14:49,797 INFO L306 CDTParser]: Found 1 translation units. [2022-07-22 13:14:49,798 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/eca-rers2018/Problem11.c [2022-07-22 13:14:49,829 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6288dd149/4e4e92cebc9e479689c21b4a11c563e0/FLAG0c91c149f [2022-07-22 13:14:49,983 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6288dd149/4e4e92cebc9e479689c21b4a11c563e0 [2022-07-22 13:14:49,985 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-07-22 13:14:49,986 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-07-22 13:14:49,990 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-07-22 13:14:49,990 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-07-22 13:14:49,993 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-07-22 13:14:49,994 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.07 01:14:49" (1/1) ... [2022-07-22 13:14:49,994 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@679f8355 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.07 01:14:49, skipping insertion in model container [2022-07-22 13:14:49,995 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.07 01:14:49" (1/1) ... [2022-07-22 13:14:50,005 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-07-22 13:14:50,083 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-07-22 13:14:50,269 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/eca-rers2018/Problem11.c[778,791] [2022-07-22 13:14:50,275 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/eca-rers2018/Problem11.c[817,830] [2022-07-22 13:14:50,892 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-07-22 13:14:50,902 INFO L203 MainTranslator]: Completed pre-run [2022-07-22 13:14:50,912 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/eca-rers2018/Problem11.c[778,791] [2022-07-22 13:14:50,912 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/eca-rers2018/Problem11.c[817,830] [2022-07-22 13:14:51,041 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-07-22 13:14:51,101 INFO L208 MainTranslator]: Completed translation [2022-07-22 13:14:51,102 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.07 01:14:51 WrapperNode [2022-07-22 13:14:51,102 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-07-22 13:14:51,103 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-07-22 13:14:51,103 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-07-22 13:14:51,103 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-07-22 13:14:51,107 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.07 01:14:51" (1/1) ... [2022-07-22 13:14:51,142 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.07 01:14:51" (1/1) ... [2022-07-22 13:14:51,331 INFO L137 Inliner]: procedures = 286, calls = 252, calls flagged for inlining = 148, calls inlined = 148, statements flattened = 2260 [2022-07-22 13:14:51,331 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-07-22 13:14:51,332 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-07-22 13:14:51,332 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-07-22 13:14:51,332 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-07-22 13:14:51,340 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.07 01:14:51" (1/1) ... [2022-07-22 13:14:51,341 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.07 01:14:51" (1/1) ... [2022-07-22 13:14:51,373 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.07 01:14:51" (1/1) ... [2022-07-22 13:14:51,374 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.07 01:14:51" (1/1) ... [2022-07-22 13:14:51,510 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.07 01:14:51" (1/1) ... [2022-07-22 13:14:51,532 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.07 01:14:51" (1/1) ... [2022-07-22 13:14:51,552 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.07 01:14:51" (1/1) ... [2022-07-22 13:14:51,602 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-07-22 13:14:51,603 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-07-22 13:14:51,604 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-07-22 13:14:51,604 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-07-22 13:14:51,607 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.07 01:14:51" (1/1) ... [2022-07-22 13:14:51,613 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-07-22 13:14:51,622 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-22 13:14:51,641 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-07-22 13:14:51,665 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-07-22 13:14:51,681 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-07-22 13:14:51,681 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error_a [2022-07-22 13:14:51,681 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error_a [2022-07-22 13:14:51,681 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error_b [2022-07-22 13:14:51,681 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error_b [2022-07-22 13:14:51,682 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-07-22 13:14:51,682 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-07-22 13:14:51,682 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-07-22 13:14:51,843 INFO L234 CfgBuilder]: Building ICFG [2022-07-22 13:14:51,845 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-07-22 13:15:31,560 INFO L275 CfgBuilder]: Performing block encoding [2022-07-22 13:15:31,572 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-07-22 13:15:31,572 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2022-07-22 13:15:31,575 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.07 01:15:31 BoogieIcfgContainer [2022-07-22 13:15:31,575 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-07-22 13:15:31,577 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-07-22 13:15:31,578 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-07-22 13:15:31,581 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-07-22 13:15:31,581 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.07 01:14:49" (1/3) ... [2022-07-22 13:15:31,582 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3bb2ec8d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.07 01:15:31, skipping insertion in model container [2022-07-22 13:15:31,582 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.07 01:14:51" (2/3) ... [2022-07-22 13:15:31,583 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3bb2ec8d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.07 01:15:31, skipping insertion in model container [2022-07-22 13:15:31,583 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.07 01:15:31" (3/3) ... [2022-07-22 13:15:31,584 INFO L111 eAbstractionObserver]: Analyzing ICFG Problem11.c [2022-07-22 13:15:31,598 INFO L201 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-07-22 13:15:31,599 INFO L160 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2022-07-22 13:15:31,677 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-07-22 13:15:31,684 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings@14927d92, mLbeIndependenceSettings=de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings@1714d7c8 [2022-07-22 13:15:31,684 INFO L358 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2022-07-22 13:15:31,692 INFO L276 IsEmpty]: Start isEmpty. Operand has 705 states, 600 states have (on average 1.5866666666666667) internal successors, (952), 602 states have internal predecessors, (952), 100 states have call successors, (100), 2 states have call predecessors, (100), 2 states have return successors, (100), 100 states have call predecessors, (100), 100 states have call successors, (100) [2022-07-22 13:15:31,702 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2022-07-22 13:15:31,702 INFO L187 NwaCegarLoop]: Found error trace [2022-07-22 13:15:31,703 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-22 13:15:31,703 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-07-22 13:15:31,708 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-22 13:15:31,708 INFO L85 PathProgramCache]: Analyzing trace with hash -295136918, now seen corresponding path program 1 times [2022-07-22 13:15:31,716 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-22 13:15:31,717 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1126169812] [2022-07-22 13:15:31,717 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-22 13:15:31,718 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-22 13:15:31,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-22 13:15:32,158 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-22 13:15:32,158 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-22 13:15:32,159 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1126169812] [2022-07-22 13:15:32,159 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1126169812] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-22 13:15:32,159 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-22 13:15:32,160 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-07-22 13:15:32,161 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1921866622] [2022-07-22 13:15:32,162 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-22 13:15:32,166 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-07-22 13:15:32,166 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-22 13:15:32,204 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-07-22 13:15:32,220 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-07-22 13:15:32,223 INFO L87 Difference]: Start difference. First operand has 705 states, 600 states have (on average 1.5866666666666667) internal successors, (952), 602 states have internal predecessors, (952), 100 states have call successors, (100), 2 states have call predecessors, (100), 2 states have return successors, (100), 100 states have call predecessors, (100), 100 states have call successors, (100) Second operand has 4 states, 4 states have (on average 3.75) internal successors, (15), 3 states have internal predecessors, (15), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-22 13:15:36,002 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-07-22 13:15:37,168 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.13s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-07-22 13:15:39,260 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-07-22 13:15:41,003 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.12s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-07-22 13:15:42,334 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.29s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-07-22 13:15:46,364 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-07-22 13:15:48,782 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-07-22 13:15:53,360 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-07-22 13:15:56,033 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-07-22 13:15:58,055 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-07-22 13:16:00,072 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-07-22 13:16:02,101 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-07-22 13:16:04,121 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-07-22 13:16:05,299 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.15s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-07-22 13:16:07,270 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.28s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-07-22 13:16:09,769 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-07-22 13:16:11,804 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-07-22 13:16:13,820 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-07-22 13:16:15,837 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-07-22 13:16:17,876 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-07-22 13:16:19,907 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-07-22 13:16:21,141 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.21s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-07-22 13:16:24,024 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-07-22 13:16:25,911 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.86s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-07-22 13:16:28,386 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-07-22 13:16:31,170 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-07-22 13:16:33,923 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-07-22 13:16:36,181 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-07-22 13:16:36,189 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-22 13:16:36,189 INFO L93 Difference]: Finished difference Result 1476 states and 2516 transitions. [2022-07-22 13:16:36,203 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-07-22 13:16:36,205 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.75) internal successors, (15), 3 states have internal predecessors, (15), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2022-07-22 13:16:36,205 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-22 13:16:36,219 INFO L225 Difference]: With dead ends: 1476 [2022-07-22 13:16:36,219 INFO L226 Difference]: Without dead ends: 767 [2022-07-22 13:16:36,225 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-07-22 13:16:36,228 INFO L413 NwaCegarLoop]: 724 mSDtfsCounter, 177 mSDsluCounter, 604 mSDsCounter, 0 mSdLazyCounter, 1208 mSolverCounterSat, 108 mSolverCounterUnsat, 21 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 63.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 177 SdHoareTripleChecker+Valid, 1328 SdHoareTripleChecker+Invalid, 1337 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 108 IncrementalHoareTripleChecker+Valid, 1208 IncrementalHoareTripleChecker+Invalid, 21 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 63.8s IncrementalHoareTripleChecker+Time [2022-07-22 13:16:36,229 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [177 Valid, 1328 Invalid, 1337 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [108 Valid, 1208 Invalid, 21 Unknown, 0 Unchecked, 63.8s Time] [2022-07-22 13:16:36,243 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 767 states. [2022-07-22 13:16:36,313 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 767 to 732. [2022-07-22 13:16:36,320 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 732 states, 630 states have (on average 1.4285714285714286) internal successors, (900), 729 states have internal predecessors, (900), 100 states have call successors, (100), 2 states have call predecessors, (100), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-22 13:16:36,344 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 732 states to 732 states and 1000 transitions. [2022-07-22 13:16:36,346 INFO L78 Accepts]: Start accepts. Automaton has 732 states and 1000 transitions. Word has length 16 [2022-07-22 13:16:36,346 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-22 13:16:36,347 INFO L495 AbstractCegarLoop]: Abstraction has 732 states and 1000 transitions. [2022-07-22 13:16:36,347 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.75) internal successors, (15), 3 states have internal predecessors, (15), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-22 13:16:36,347 INFO L276 IsEmpty]: Start isEmpty. Operand 732 states and 1000 transitions. [2022-07-22 13:16:36,349 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-07-22 13:16:36,350 INFO L187 NwaCegarLoop]: Found error trace [2022-07-22 13:16:36,350 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-22 13:16:36,350 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-07-22 13:16:36,350 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-07-22 13:16:36,351 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-22 13:16:36,351 INFO L85 PathProgramCache]: Analyzing trace with hash 733246357, now seen corresponding path program 1 times [2022-07-22 13:16:36,351 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-22 13:16:36,351 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2091907382] [2022-07-22 13:16:36,351 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-22 13:16:36,351 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-22 13:16:36,401 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-07-22 13:16:36,402 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [945167137] [2022-07-22 13:16:36,404 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-22 13:16:36,405 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-22 13:16:36,405 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-22 13:16:36,411 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-22 13:16:36,436 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-07-22 13:16:36,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-22 13:16:36,550 INFO L263 TraceCheckSpWp]: Trace formula consists of 375 conjuncts, 2 conjunts are in the unsatisfiable core [2022-07-22 13:16:36,554 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-22 13:16:36,606 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-22 13:16:36,606 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-07-22 13:16:36,606 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-22 13:16:36,606 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2091907382] [2022-07-22 13:16:36,607 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-07-22 13:16:36,607 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [945167137] [2022-07-22 13:16:36,607 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [945167137] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-22 13:16:36,607 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-22 13:16:36,607 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-07-22 13:16:36,608 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1263540726] [2022-07-22 13:16:36,608 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-22 13:16:36,609 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-07-22 13:16:36,609 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-22 13:16:36,610 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-07-22 13:16:36,610 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-07-22 13:16:36,610 INFO L87 Difference]: Start difference. First operand 732 states and 1000 transitions. Second operand has 3 states, 3 states have (on average 7.666666666666667) internal successors, (23), 2 states have internal predecessors, (23), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-22 13:16:36,719 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-22 13:16:36,720 INFO L93 Difference]: Finished difference Result 1893 states and 2649 transitions. [2022-07-22 13:16:36,720 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-07-22 13:16:36,720 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 7.666666666666667) internal successors, (23), 2 states have internal predecessors, (23), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2022-07-22 13:16:36,720 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-22 13:16:36,725 INFO L225 Difference]: With dead ends: 1893 [2022-07-22 13:16:36,726 INFO L226 Difference]: Without dead ends: 1297 [2022-07-22 13:16:36,727 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-07-22 13:16:36,728 INFO L413 NwaCegarLoop]: 853 mSDtfsCounter, 777 mSDsluCounter, 831 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 777 SdHoareTripleChecker+Valid, 1684 SdHoareTripleChecker+Invalid, 23 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-07-22 13:16:36,729 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [777 Valid, 1684 Invalid, 23 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-07-22 13:16:36,731 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1297 states. [2022-07-22 13:16:36,773 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1297 to 1187. [2022-07-22 13:16:36,775 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1187 states, 1085 states have (on average 1.4663594470046082) internal successors, (1591), 1184 states have internal predecessors, (1591), 100 states have call successors, (100), 2 states have call predecessors, (100), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-22 13:16:36,780 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1187 states to 1187 states and 1691 transitions. [2022-07-22 13:16:36,780 INFO L78 Accepts]: Start accepts. Automaton has 1187 states and 1691 transitions. Word has length 24 [2022-07-22 13:16:36,780 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-22 13:16:36,780 INFO L495 AbstractCegarLoop]: Abstraction has 1187 states and 1691 transitions. [2022-07-22 13:16:36,781 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 7.666666666666667) internal successors, (23), 2 states have internal predecessors, (23), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-22 13:16:36,781 INFO L276 IsEmpty]: Start isEmpty. Operand 1187 states and 1691 transitions. [2022-07-22 13:16:36,786 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-07-22 13:16:36,787 INFO L187 NwaCegarLoop]: Found error trace [2022-07-22 13:16:36,787 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-22 13:16:36,806 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-07-22 13:16:36,995 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-22 13:16:36,996 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-07-22 13:16:36,996 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-22 13:16:36,996 INFO L85 PathProgramCache]: Analyzing trace with hash 1255084462, now seen corresponding path program 1 times [2022-07-22 13:16:36,996 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-22 13:16:36,997 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1045654670] [2022-07-22 13:16:36,997 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-22 13:16:36,997 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-22 13:16:37,053 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-07-22 13:16:37,062 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1934645790] [2022-07-22 13:16:37,062 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-22 13:16:37,062 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-22 13:16:37,063 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-22 13:16:37,076 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-22 13:16:37,125 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-07-22 13:16:37,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-22 13:16:37,245 INFO L263 TraceCheckSpWp]: Trace formula consists of 376 conjuncts, 2 conjunts are in the unsatisfiable core [2022-07-22 13:16:37,248 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-22 13:16:37,291 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-22 13:16:37,292 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-07-22 13:16:37,292 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-22 13:16:37,292 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1045654670] [2022-07-22 13:16:37,292 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-07-22 13:16:37,292 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1934645790] [2022-07-22 13:16:37,292 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1934645790] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-22 13:16:37,293 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-22 13:16:37,293 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-07-22 13:16:37,295 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1248943770] [2022-07-22 13:16:37,295 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-22 13:16:37,295 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-07-22 13:16:37,295 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-22 13:16:37,296 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-07-22 13:16:37,296 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-07-22 13:16:37,296 INFO L87 Difference]: Start difference. First operand 1187 states and 1691 transitions. Second operand has 3 states, 3 states have (on average 8.0) internal successors, (24), 2 states have internal predecessors, (24), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-22 13:16:38,751 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-22 13:16:38,751 INFO L93 Difference]: Finished difference Result 2230 states and 3211 transitions. [2022-07-22 13:16:38,757 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-07-22 13:16:38,757 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 8.0) internal successors, (24), 2 states have internal predecessors, (24), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 25 [2022-07-22 13:16:38,757 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-22 13:16:38,765 INFO L225 Difference]: With dead ends: 2230 [2022-07-22 13:16:38,765 INFO L226 Difference]: Without dead ends: 2217 [2022-07-22 13:16:38,766 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-07-22 13:16:38,767 INFO L413 NwaCegarLoop]: 867 mSDtfsCounter, 803 mSDsluCounter, 807 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 803 SdHoareTripleChecker+Valid, 1674 SdHoareTripleChecker+Invalid, 52 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2022-07-22 13:16:38,767 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [803 Valid, 1674 Invalid, 52 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 39 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2022-07-22 13:16:38,770 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2217 states. [2022-07-22 13:16:38,798 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2217 to 2124. [2022-07-22 13:16:38,801 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2124 states, 2022 states have (on average 1.4792284866468843) internal successors, (2991), 2121 states have internal predecessors, (2991), 100 states have call successors, (100), 2 states have call predecessors, (100), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-22 13:16:38,809 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2124 states to 2124 states and 3091 transitions. [2022-07-22 13:16:38,810 INFO L78 Accepts]: Start accepts. Automaton has 2124 states and 3091 transitions. Word has length 25 [2022-07-22 13:16:38,810 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-22 13:16:38,810 INFO L495 AbstractCegarLoop]: Abstraction has 2124 states and 3091 transitions. [2022-07-22 13:16:38,810 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 8.0) internal successors, (24), 2 states have internal predecessors, (24), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-22 13:16:38,810 INFO L276 IsEmpty]: Start isEmpty. Operand 2124 states and 3091 transitions. [2022-07-22 13:16:38,811 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-07-22 13:16:38,811 INFO L187 NwaCegarLoop]: Found error trace [2022-07-22 13:16:38,811 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-22 13:16:38,838 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-07-22 13:16:39,029 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2022-07-22 13:16:39,029 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-07-22 13:16:39,030 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-22 13:16:39,030 INFO L85 PathProgramCache]: Analyzing trace with hash 252203415, now seen corresponding path program 1 times [2022-07-22 13:16:39,030 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-22 13:16:39,030 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [531198747] [2022-07-22 13:16:39,030 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-22 13:16:39,030 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-22 13:16:39,133 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-07-22 13:16:39,133 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [290949668] [2022-07-22 13:16:39,133 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-22 13:16:39,134 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-22 13:16:39,134 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-22 13:16:39,135 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-22 13:16:39,136 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-07-22 13:16:39,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-22 13:16:39,257 INFO L263 TraceCheckSpWp]: Trace formula consists of 377 conjuncts, 2 conjunts are in the unsatisfiable core [2022-07-22 13:16:39,259 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-22 13:16:39,299 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-22 13:16:39,300 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-07-22 13:16:39,300 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-22 13:16:39,300 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [531198747] [2022-07-22 13:16:39,300 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-07-22 13:16:39,300 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [290949668] [2022-07-22 13:16:39,300 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [290949668] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-22 13:16:39,300 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-22 13:16:39,300 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-07-22 13:16:39,301 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1495281235] [2022-07-22 13:16:39,301 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-22 13:16:39,301 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-07-22 13:16:39,301 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-22 13:16:39,301 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-07-22 13:16:39,301 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-07-22 13:16:39,302 INFO L87 Difference]: Start difference. First operand 2124 states and 3091 transitions. Second operand has 3 states, 3 states have (on average 8.333333333333334) internal successors, (25), 2 states have internal predecessors, (25), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-22 13:16:41,691 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-07-22 13:16:44,213 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-07-22 13:16:46,649 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-07-22 13:16:48,253 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.39s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-07-22 13:16:49,638 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.26s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-07-22 13:16:51,652 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-07-22 13:16:53,686 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-07-22 13:16:56,543 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-07-22 13:16:58,530 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.97s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-07-22 13:17:00,537 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-07-22 13:17:02,550 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-07-22 13:17:04,568 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-07-22 13:17:06,586 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-07-22 13:17:07,046 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-22 13:17:07,046 INFO L93 Difference]: Finished difference Result 5971 states and 8790 transitions. [2022-07-22 13:17:07,046 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-07-22 13:17:07,047 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 8.333333333333334) internal successors, (25), 2 states have internal predecessors, (25), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 26 [2022-07-22 13:17:07,047 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-22 13:17:07,059 INFO L225 Difference]: With dead ends: 5971 [2022-07-22 13:17:07,060 INFO L226 Difference]: Without dead ends: 3983 [2022-07-22 13:17:07,064 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-07-22 13:17:07,066 INFO L413 NwaCegarLoop]: 927 mSDtfsCounter, 760 mSDsluCounter, 704 mSDsCounter, 0 mSdLazyCounter, 132 mSolverCounterSat, 41 mSolverCounterUnsat, 10 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 27.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 760 SdHoareTripleChecker+Valid, 1631 SdHoareTripleChecker+Invalid, 183 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 132 IncrementalHoareTripleChecker+Invalid, 10 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 27.7s IncrementalHoareTripleChecker+Time [2022-07-22 13:17:07,067 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [760 Valid, 1631 Invalid, 183 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 132 Invalid, 10 Unknown, 0 Unchecked, 27.7s Time] [2022-07-22 13:17:07,072 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3983 states. [2022-07-22 13:17:07,125 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3983 to 3758. [2022-07-22 13:17:07,130 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3758 states, 3656 states have (on average 1.5090262582056893) internal successors, (5517), 3755 states have internal predecessors, (5517), 100 states have call successors, (100), 2 states have call predecessors, (100), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-22 13:17:07,142 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3758 states to 3758 states and 5617 transitions. [2022-07-22 13:17:07,143 INFO L78 Accepts]: Start accepts. Automaton has 3758 states and 5617 transitions. Word has length 26 [2022-07-22 13:17:07,143 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-22 13:17:07,143 INFO L495 AbstractCegarLoop]: Abstraction has 3758 states and 5617 transitions. [2022-07-22 13:17:07,143 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 8.333333333333334) internal successors, (25), 2 states have internal predecessors, (25), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-22 13:17:07,144 INFO L276 IsEmpty]: Start isEmpty. Operand 3758 states and 5617 transitions. [2022-07-22 13:17:07,144 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-07-22 13:17:07,145 INFO L187 NwaCegarLoop]: Found error trace [2022-07-22 13:17:07,145 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-22 13:17:07,167 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-07-22 13:17:07,359 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-22 13:17:07,360 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-07-22 13:17:07,360 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-22 13:17:07,360 INFO L85 PathProgramCache]: Analyzing trace with hash -1845510924, now seen corresponding path program 1 times [2022-07-22 13:17:07,360 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-22 13:17:07,360 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1575290790] [2022-07-22 13:17:07,360 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-22 13:17:07,360 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-22 13:17:07,387 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-07-22 13:17:07,387 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [351106223] [2022-07-22 13:17:07,388 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-22 13:17:07,388 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-22 13:17:07,388 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-22 13:17:07,390 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-22 13:17:07,391 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-07-22 13:17:07,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-22 13:17:07,544 INFO L263 TraceCheckSpWp]: Trace formula consists of 427 conjuncts, 2 conjunts are in the unsatisfiable core [2022-07-22 13:17:07,545 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-22 13:17:07,563 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-22 13:17:07,563 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-07-22 13:17:07,564 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-22 13:17:07,564 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1575290790] [2022-07-22 13:17:07,564 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-07-22 13:17:07,564 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [351106223] [2022-07-22 13:17:07,564 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [351106223] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-22 13:17:07,564 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-22 13:17:07,564 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-07-22 13:17:07,564 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2106477340] [2022-07-22 13:17:07,564 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-22 13:17:07,564 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-07-22 13:17:07,565 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-22 13:17:07,565 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-07-22 13:17:07,565 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-07-22 13:17:07,565 INFO L87 Difference]: Start difference. First operand 3758 states and 5617 transitions. Second operand has 3 states, 3 states have (on average 8.666666666666666) internal successors, (26), 2 states have internal predecessors, (26), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-22 13:17:10,214 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-07-22 13:17:12,226 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-07-22 13:17:13,952 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.72s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-07-22 13:17:14,459 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-22 13:17:14,459 INFO L93 Difference]: Finished difference Result 11045 states and 16558 transitions. [2022-07-22 13:17:14,461 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-07-22 13:17:14,461 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 8.666666666666666) internal successors, (26), 2 states have internal predecessors, (26), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 27 [2022-07-22 13:17:14,461 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-22 13:17:14,485 INFO L225 Difference]: With dead ends: 11045 [2022-07-22 13:17:14,485 INFO L226 Difference]: Without dead ends: 7289 [2022-07-22 13:17:14,493 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-07-22 13:17:14,493 INFO L413 NwaCegarLoop]: 927 mSDtfsCounter, 806 mSDsluCounter, 823 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 4 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 806 SdHoareTripleChecker+Valid, 1750 SdHoareTripleChecker+Invalid, 35 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.8s IncrementalHoareTripleChecker+Time [2022-07-22 13:17:14,494 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [806 Valid, 1750 Invalid, 35 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 29 Invalid, 2 Unknown, 0 Unchecked, 6.8s Time] [2022-07-22 13:17:14,500 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7289 states. [2022-07-22 13:17:14,721 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7289 to 6981. [2022-07-22 13:17:14,744 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6981 states, 6879 states have (on average 1.525948539031836) internal successors, (10497), 6978 states have internal predecessors, (10497), 100 states have call successors, (100), 2 states have call predecessors, (100), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-22 13:17:14,758 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6981 states to 6981 states and 10597 transitions. [2022-07-22 13:17:14,770 INFO L78 Accepts]: Start accepts. Automaton has 6981 states and 10597 transitions. Word has length 27 [2022-07-22 13:17:14,770 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-22 13:17:14,770 INFO L495 AbstractCegarLoop]: Abstraction has 6981 states and 10597 transitions. [2022-07-22 13:17:14,770 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 8.666666666666666) internal successors, (26), 2 states have internal predecessors, (26), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-22 13:17:14,771 INFO L276 IsEmpty]: Start isEmpty. Operand 6981 states and 10597 transitions. [2022-07-22 13:17:14,771 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-07-22 13:17:14,771 INFO L187 NwaCegarLoop]: Found error trace [2022-07-22 13:17:14,772 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-22 13:17:14,806 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-07-22 13:17:14,972 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-22 13:17:14,972 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-07-22 13:17:14,973 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-22 13:17:14,973 INFO L85 PathProgramCache]: Analyzing trace with hash -772331178, now seen corresponding path program 1 times [2022-07-22 13:17:14,973 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-22 13:17:14,973 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1703532867] [2022-07-22 13:17:14,973 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-22 13:17:14,973 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-22 13:17:15,001 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-07-22 13:17:15,003 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1454986478] [2022-07-22 13:17:15,004 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-22 13:17:15,004 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-22 13:17:15,004 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-22 13:17:15,005 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-22 13:17:15,006 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-07-22 13:17:15,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-22 13:17:15,177 INFO L263 TraceCheckSpWp]: Trace formula consists of 378 conjuncts, 2 conjunts are in the unsatisfiable core [2022-07-22 13:17:15,184 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-22 13:17:15,245 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-22 13:17:15,245 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-07-22 13:17:15,245 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-22 13:17:15,246 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1703532867] [2022-07-22 13:17:15,246 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-07-22 13:17:15,246 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1454986478] [2022-07-22 13:17:15,247 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1454986478] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-22 13:17:15,247 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-22 13:17:15,247 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-07-22 13:17:15,247 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2050661323] [2022-07-22 13:17:15,247 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-22 13:17:15,248 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-07-22 13:17:15,248 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-22 13:17:15,249 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-07-22 13:17:15,250 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-07-22 13:17:15,250 INFO L87 Difference]: Start difference. First operand 6981 states and 10597 transitions. Second operand has 3 states, 3 states have (on average 8.666666666666666) internal successors, (26), 2 states have internal predecessors, (26), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-22 13:17:17,307 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-07-22 13:17:18,660 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.33s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-07-22 13:17:20,681 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-07-22 13:17:20,714 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-22 13:17:20,714 INFO L93 Difference]: Finished difference Result 20410 states and 31110 transitions. [2022-07-22 13:17:20,723 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-07-22 13:17:20,723 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 8.666666666666666) internal successors, (26), 2 states have internal predecessors, (26), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 27 [2022-07-22 13:17:20,723 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-22 13:17:20,811 INFO L225 Difference]: With dead ends: 20410 [2022-07-22 13:17:20,811 INFO L226 Difference]: Without dead ends: 13558 [2022-07-22 13:17:20,818 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-07-22 13:17:20,820 INFO L413 NwaCegarLoop]: 847 mSDtfsCounter, 787 mSDsluCounter, 830 mSDsCounter, 0 mSdLazyCounter, 18 mSolverCounterSat, 4 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 787 SdHoareTripleChecker+Valid, 1677 SdHoareTripleChecker+Invalid, 24 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 18 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.4s IncrementalHoareTripleChecker+Time [2022-07-22 13:17:20,820 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [787 Valid, 1677 Invalid, 24 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 18 Invalid, 2 Unknown, 0 Unchecked, 5.4s Time] [2022-07-22 13:17:20,831 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13558 states. [2022-07-22 13:17:21,111 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13558 to 13409. [2022-07-22 13:17:21,151 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13409 states, 13307 states have (on average 1.5285939730968663) internal successors, (20341), 13406 states have internal predecessors, (20341), 100 states have call successors, (100), 2 states have call predecessors, (100), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-22 13:17:21,287 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13409 states to 13409 states and 20441 transitions. [2022-07-22 13:17:21,288 INFO L78 Accepts]: Start accepts. Automaton has 13409 states and 20441 transitions. Word has length 27 [2022-07-22 13:17:21,288 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-22 13:17:21,288 INFO L495 AbstractCegarLoop]: Abstraction has 13409 states and 20441 transitions. [2022-07-22 13:17:21,289 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 8.666666666666666) internal successors, (26), 2 states have internal predecessors, (26), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-22 13:17:21,289 INFO L276 IsEmpty]: Start isEmpty. Operand 13409 states and 20441 transitions. [2022-07-22 13:17:21,289 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-07-22 13:17:21,289 INFO L187 NwaCegarLoop]: Found error trace [2022-07-22 13:17:21,289 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-22 13:17:21,329 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2022-07-22 13:17:21,490 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-22 13:17:21,490 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-07-22 13:17:21,491 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-22 13:17:21,491 INFO L85 PathProgramCache]: Analyzing trace with hash -1121479118, now seen corresponding path program 1 times [2022-07-22 13:17:21,491 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-22 13:17:21,491 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [506803021] [2022-07-22 13:17:21,491 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-22 13:17:21,491 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-22 13:17:21,518 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-07-22 13:17:21,519 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [62795120] [2022-07-22 13:17:21,520 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-22 13:17:21,520 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-22 13:17:21,520 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-22 13:17:21,521 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-22 13:17:21,522 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-07-22 13:17:21,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-22 13:17:21,690 INFO L263 TraceCheckSpWp]: Trace formula consists of 440 conjuncts, 2 conjunts are in the unsatisfiable core [2022-07-22 13:17:21,691 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-22 13:17:21,701 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-22 13:17:21,701 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-07-22 13:17:21,702 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-22 13:17:21,702 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [506803021] [2022-07-22 13:17:21,702 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-07-22 13:17:21,702 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [62795120] [2022-07-22 13:17:21,702 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [62795120] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-22 13:17:21,702 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-22 13:17:21,702 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-07-22 13:17:21,703 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [740071500] [2022-07-22 13:17:21,703 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-22 13:17:21,703 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-07-22 13:17:21,703 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-22 13:17:21,703 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-07-22 13:17:21,704 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-07-22 13:17:21,704 INFO L87 Difference]: Start difference. First operand 13409 states and 20441 transitions. Second operand has 3 states, 3 states have (on average 9.0) internal successors, (27), 3 states have internal predecessors, (27), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-22 13:17:23,968 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-07-22 13:17:25,988 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-07-22 13:17:28,016 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-07-22 13:17:29,958 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.93s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-07-22 13:17:31,980 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-07-22 13:17:34,028 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.35s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-07-22 13:17:36,039 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-07-22 13:17:38,050 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-07-22 13:17:40,076 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-07-22 13:17:42,095 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-07-22 13:17:44,106 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-07-22 13:17:46,131 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-07-22 13:17:48,145 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-07-22 13:17:48,278 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-22 13:17:48,279 INFO L93 Difference]: Finished difference Result 35105 states and 54533 transitions. [2022-07-22 13:17:48,279 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-07-22 13:17:48,280 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), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 28 [2022-07-22 13:17:48,280 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-22 13:17:48,320 INFO L225 Difference]: With dead ends: 35105 [2022-07-22 13:17:48,321 INFO L226 Difference]: Without dead ends: 21825 [2022-07-22 13:17:48,339 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-07-22 13:17:48,362 INFO L413 NwaCegarLoop]: 1068 mSDtfsCounter, 627 mSDsluCounter, 701 mSDsCounter, 0 mSdLazyCounter, 121 mSolverCounterSat, 51 mSolverCounterUnsat, 11 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 26.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 627 SdHoareTripleChecker+Valid, 1769 SdHoareTripleChecker+Invalid, 183 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 121 IncrementalHoareTripleChecker+Invalid, 11 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 26.4s IncrementalHoareTripleChecker+Time [2022-07-22 13:17:48,363 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [627 Valid, 1769 Invalid, 183 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 121 Invalid, 11 Unknown, 0 Unchecked, 26.4s Time] [2022-07-22 13:17:48,401 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21825 states. [2022-07-22 13:17:48,866 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21825 to 21401. [2022-07-22 13:17:48,971 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21401 states, 21299 states have (on average 1.5526081036668389) internal successors, (33069), 21398 states have internal predecessors, (33069), 100 states have call successors, (100), 2 states have call predecessors, (100), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-22 13:17:49,084 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21401 states to 21401 states and 33169 transitions. [2022-07-22 13:17:49,085 INFO L78 Accepts]: Start accepts. Automaton has 21401 states and 33169 transitions. Word has length 28 [2022-07-22 13:17:49,085 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-22 13:17:49,085 INFO L495 AbstractCegarLoop]: Abstraction has 21401 states and 33169 transitions. [2022-07-22 13:17:49,086 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 9.0) internal successors, (27), 3 states have internal predecessors, (27), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-22 13:17:49,086 INFO L276 IsEmpty]: Start isEmpty. Operand 21401 states and 33169 transitions. [2022-07-22 13:17:49,087 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-07-22 13:17:49,087 INFO L187 NwaCegarLoop]: Found error trace [2022-07-22 13:17:49,087 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-22 13:17:49,111 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-07-22 13:17:49,311 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-22 13:17:49,312 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-07-22 13:17:49,312 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-22 13:17:49,312 INFO L85 PathProgramCache]: Analyzing trace with hash -2132596368, now seen corresponding path program 1 times [2022-07-22 13:17:49,312 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-22 13:17:49,313 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [249932204] [2022-07-22 13:17:49,313 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-22 13:17:49,313 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-22 13:17:49,334 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-07-22 13:17:49,334 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [70651387] [2022-07-22 13:17:49,334 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-22 13:17:49,334 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-22 13:17:49,335 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-22 13:17:49,336 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-22 13:17:49,337 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-07-22 13:17:49,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-22 13:17:49,467 INFO L263 TraceCheckSpWp]: Trace formula consists of 383 conjuncts, 2 conjunts are in the unsatisfiable core [2022-07-22 13:17:49,468 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-22 13:17:49,481 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-22 13:17:49,481 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-07-22 13:17:49,481 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-22 13:17:49,481 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [249932204] [2022-07-22 13:17:49,482 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-07-22 13:17:49,482 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [70651387] [2022-07-22 13:17:49,482 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [70651387] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-22 13:17:49,482 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-22 13:17:49,482 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-07-22 13:17:49,482 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1142321716] [2022-07-22 13:17:49,484 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-22 13:17:49,484 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-07-22 13:17:49,484 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-22 13:17:49,485 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-07-22 13:17:49,485 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-07-22 13:17:49,485 INFO L87 Difference]: Start difference. First operand 21401 states and 33169 transitions. Second operand has 3 states, 3 states have (on average 9.0) internal successors, (27), 3 states have internal predecessors, (27), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-22 13:17:49,837 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-22 13:17:49,837 INFO L93 Difference]: Finished difference Result 42389 states and 65801 transitions. [2022-07-22 13:17:49,838 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-07-22 13:17:49,838 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), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 28 [2022-07-22 13:17:49,838 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-22 13:17:49,986 INFO L225 Difference]: With dead ends: 42389 [2022-07-22 13:17:49,999 INFO L226 Difference]: Without dead ends: 42383 [2022-07-22 13:17:50,007 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-07-22 13:17:50,017 INFO L413 NwaCegarLoop]: 872 mSDtfsCounter, 831 mSDsluCounter, 816 mSDsCounter, 0 mSdLazyCounter, 11 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 831 SdHoareTripleChecker+Valid, 1688 SdHoareTripleChecker+Invalid, 16 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 11 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-07-22 13:17:50,018 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [831 Valid, 1688 Invalid, 16 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 11 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-07-22 13:17:50,069 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42383 states. [2022-07-22 13:17:50,591 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42383 to 42137. [2022-07-22 13:17:50,662 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42137 states, 42035 states have (on average 1.555584631854407) internal successors, (65389), 42134 states have internal predecessors, (65389), 100 states have call successors, (100), 2 states have call predecessors, (100), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-22 13:17:50,757 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42137 states to 42137 states and 65489 transitions. [2022-07-22 13:17:50,758 INFO L78 Accepts]: Start accepts. Automaton has 42137 states and 65489 transitions. Word has length 28 [2022-07-22 13:17:50,758 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-22 13:17:50,758 INFO L495 AbstractCegarLoop]: Abstraction has 42137 states and 65489 transitions. [2022-07-22 13:17:50,759 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 9.0) internal successors, (27), 3 states have internal predecessors, (27), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-22 13:17:50,759 INFO L276 IsEmpty]: Start isEmpty. Operand 42137 states and 65489 transitions. [2022-07-22 13:17:50,760 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-07-22 13:17:50,760 INFO L187 NwaCegarLoop]: Found error trace [2022-07-22 13:17:50,760 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-22 13:17:50,784 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-07-22 13:17:50,981 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-22 13:17:50,982 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-07-22 13:17:50,982 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-22 13:17:50,982 INFO L85 PathProgramCache]: Analyzing trace with hash 796822779, now seen corresponding path program 1 times [2022-07-22 13:17:50,983 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-22 13:17:50,983 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1021895354] [2022-07-22 13:17:50,983 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-22 13:17:50,983 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-22 13:17:51,003 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-07-22 13:17:51,004 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1035850274] [2022-07-22 13:17:51,004 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-22 13:17:51,004 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-22 13:17:51,004 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-22 13:17:51,005 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-22 13:17:51,123 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-07-22 13:17:51,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-22 13:17:51,297 INFO L263 TraceCheckSpWp]: Trace formula consists of 380 conjuncts, 2 conjunts are in the unsatisfiable core [2022-07-22 13:17:51,298 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-22 13:17:51,333 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-22 13:17:51,333 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-07-22 13:17:51,334 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-22 13:17:51,334 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1021895354] [2022-07-22 13:17:51,334 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-07-22 13:17:51,334 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1035850274] [2022-07-22 13:17:51,334 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1035850274] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-22 13:17:51,334 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-22 13:17:51,334 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-07-22 13:17:51,337 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2116777692] [2022-07-22 13:17:51,337 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-22 13:17:51,337 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-07-22 13:17:51,337 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-22 13:17:51,338 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-07-22 13:17:51,338 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-07-22 13:17:51,339 INFO L87 Difference]: Start difference. First operand 42137 states and 65489 transitions. Second operand has 3 states, 3 states have (on average 9.333333333333334) internal successors, (28), 2 states have internal predecessors, (28), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-22 13:17:53,219 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.86s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-07-22 13:17:55,416 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-07-22 13:17:57,432 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-07-22 13:17:58,766 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.33s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-07-22 13:18:00,790 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-07-22 13:18:02,803 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-07-22 13:18:04,818 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-07-22 13:18:07,446 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-07-22 13:18:09,457 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-07-22 13:18:09,705 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-22 13:18:09,705 INFO L93 Difference]: Finished difference Result 123783 states and 193051 transitions. [2022-07-22 13:18:09,719 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-07-22 13:18:09,719 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 9.333333333333334) internal successors, (28), 2 states have internal predecessors, (28), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 29 [2022-07-22 13:18:09,720 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-22 13:18:09,940 INFO L225 Difference]: With dead ends: 123783 [2022-07-22 13:18:09,940 INFO L226 Difference]: Without dead ends: 81775 [2022-07-22 13:18:10,013 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-07-22 13:18:10,015 INFO L413 NwaCegarLoop]: 895 mSDtfsCounter, 760 mSDsluCounter, 818 mSDsCounter, 0 mSdLazyCounter, 28 mSolverCounterSat, 4 mSolverCounterUnsat, 7 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 18.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 760 SdHoareTripleChecker+Valid, 1713 SdHoareTripleChecker+Invalid, 39 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 28 IncrementalHoareTripleChecker+Invalid, 7 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 18.1s IncrementalHoareTripleChecker+Time [2022-07-22 13:18:10,015 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [760 Valid, 1713 Invalid, 39 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 28 Invalid, 7 Unknown, 0 Unchecked, 18.1s Time] [2022-07-22 13:18:10,089 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81775 states. [2022-07-22 13:18:11,052 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81775 to 80777. [2022-07-22 13:18:11,164 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80777 states, 80675 states have (on average 1.5637682057638673) internal successors, (126157), 80774 states have internal predecessors, (126157), 100 states have call successors, (100), 2 states have call predecessors, (100), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-22 13:18:11,657 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80777 states to 80777 states and 126257 transitions. [2022-07-22 13:18:11,658 INFO L78 Accepts]: Start accepts. Automaton has 80777 states and 126257 transitions. Word has length 29 [2022-07-22 13:18:11,660 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-22 13:18:11,660 INFO L495 AbstractCegarLoop]: Abstraction has 80777 states and 126257 transitions. [2022-07-22 13:18:11,660 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 9.333333333333334) internal successors, (28), 2 states have internal predecessors, (28), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-22 13:18:11,660 INFO L276 IsEmpty]: Start isEmpty. Operand 80777 states and 126257 transitions. [2022-07-22 13:18:11,663 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2022-07-22 13:18:11,663 INFO L187 NwaCegarLoop]: Found error trace [2022-07-22 13:18:11,663 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-22 13:18:11,689 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-07-22 13:18:11,888 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2022-07-22 13:18:11,888 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-07-22 13:18:11,889 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-22 13:18:11,889 INFO L85 PathProgramCache]: Analyzing trace with hash -1068979804, now seen corresponding path program 1 times [2022-07-22 13:18:11,889 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-22 13:18:11,889 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [702922116] [2022-07-22 13:18:11,889 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-22 13:18:11,890 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-22 13:18:11,949 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-07-22 13:18:11,957 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1020265536] [2022-07-22 13:18:11,958 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-22 13:18:11,958 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-22 13:18:11,958 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-22 13:18:11,960 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-22 13:18:11,961 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-07-22 13:18:12,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-22 13:18:12,149 INFO L263 TraceCheckSpWp]: Trace formula consists of 380 conjuncts, 2 conjunts are in the unsatisfiable core [2022-07-22 13:18:12,151 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-22 13:18:12,187 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-22 13:18:12,188 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-07-22 13:18:12,188 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-22 13:18:12,189 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [702922116] [2022-07-22 13:18:12,189 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-07-22 13:18:12,189 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1020265536] [2022-07-22 13:18:12,189 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1020265536] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-22 13:18:12,190 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-22 13:18:12,190 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-07-22 13:18:12,190 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1663295489] [2022-07-22 13:18:12,190 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-22 13:18:12,192 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-07-22 13:18:12,192 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-22 13:18:12,193 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-07-22 13:18:12,193 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-07-22 13:18:12,193 INFO L87 Difference]: Start difference. First operand 80777 states and 126257 transitions. Second operand has 3 states, 3 states have (on average 9.666666666666666) internal successors, (29), 2 states have internal predecessors, (29), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-22 13:18:14,207 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-07-22 13:18:15,149 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-22 13:18:15,149 INFO L93 Difference]: Finished difference Result 161425 states and 252374 transitions. [2022-07-22 13:18:15,152 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-07-22 13:18:15,153 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 9.666666666666666) internal successors, (29), 2 states have internal predecessors, (29), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 30 [2022-07-22 13:18:15,153 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-22 13:18:15,446 INFO L225 Difference]: With dead ends: 161425 [2022-07-22 13:18:15,446 INFO L226 Difference]: Without dead ends: 161422 [2022-07-22 13:18:15,475 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-07-22 13:18:15,475 INFO L413 NwaCegarLoop]: 840 mSDtfsCounter, 815 mSDsluCounter, 832 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 2 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 815 SdHoareTripleChecker+Valid, 1672 SdHoareTripleChecker+Invalid, 19 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2022-07-22 13:18:15,476 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [815 Valid, 1672 Invalid, 19 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 16 Invalid, 1 Unknown, 0 Unchecked, 2.3s Time] [2022-07-22 13:18:15,673 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 161422 states. [2022-07-22 13:18:17,141 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 161422 to 160617. [2022-07-22 13:18:17,281 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 160617 states, 160515 states have (on average 1.5650437653801825) internal successors, (251213), 160614 states have internal predecessors, (251213), 100 states have call successors, (100), 2 states have call predecessors, (100), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-22 13:18:17,859 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160617 states to 160617 states and 251313 transitions. [2022-07-22 13:18:17,859 INFO L78 Accepts]: Start accepts. Automaton has 160617 states and 251313 transitions. Word has length 30 [2022-07-22 13:18:17,859 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-22 13:18:17,859 INFO L495 AbstractCegarLoop]: Abstraction has 160617 states and 251313 transitions. [2022-07-22 13:18:17,860 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 9.666666666666666) internal successors, (29), 2 states have internal predecessors, (29), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-22 13:18:17,860 INFO L276 IsEmpty]: Start isEmpty. Operand 160617 states and 251313 transitions. [2022-07-22 13:18:17,861 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-07-22 13:18:17,861 INFO L187 NwaCegarLoop]: Found error trace [2022-07-22 13:18:17,861 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-22 13:18:17,878 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-07-22 13:18:18,063 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-07-22 13:18:18,064 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-07-22 13:18:18,064 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-22 13:18:18,064 INFO L85 PathProgramCache]: Analyzing trace with hash -814013527, now seen corresponding path program 1 times [2022-07-22 13:18:18,064 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-22 13:18:18,064 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [435151795] [2022-07-22 13:18:18,064 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-22 13:18:18,064 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-22 13:18:18,076 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-07-22 13:18:18,076 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1211923242] [2022-07-22 13:18:18,077 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-22 13:18:18,077 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-22 13:18:18,077 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-22 13:18:18,078 INFO L229 MonitoredProcess]: Starting monitored process 11 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-22 13:18:18,119 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-07-22 13:18:18,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-22 13:18:18,220 INFO L263 TraceCheckSpWp]: Trace formula consists of 383 conjuncts, 2 conjunts are in the unsatisfiable core [2022-07-22 13:18:18,223 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-22 13:18:18,263 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-22 13:18:18,263 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-07-22 13:18:18,264 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-22 13:18:18,264 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [435151795] [2022-07-22 13:18:18,264 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-07-22 13:18:18,264 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1211923242] [2022-07-22 13:18:18,264 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1211923242] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-22 13:18:18,264 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-22 13:18:18,264 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-07-22 13:18:18,264 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [154201912] [2022-07-22 13:18:18,264 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-22 13:18:18,265 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-07-22 13:18:18,265 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-22 13:18:18,265 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-07-22 13:18:18,265 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-07-22 13:18:18,265 INFO L87 Difference]: Start difference. First operand 160617 states and 251313 transitions. Second operand has 3 states, 3 states have (on average 10.333333333333334) internal successors, (31), 2 states have internal predecessors, (31), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-22 13:18:19,618 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-22 13:18:19,618 INFO L93 Difference]: Finished difference Result 321105 states and 502486 transitions. [2022-07-22 13:18:19,618 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-07-22 13:18:19,619 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 10.333333333333334) internal successors, (31), 2 states have internal predecessors, (31), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 32 [2022-07-22 13:18:19,619 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-22 13:18:20,127 INFO L225 Difference]: With dead ends: 321105 [2022-07-22 13:18:20,128 INFO L226 Difference]: Without dead ends: 321101 [2022-07-22 13:18:20,182 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-07-22 13:18:20,183 INFO L413 NwaCegarLoop]: 841 mSDtfsCounter, 812 mSDsluCounter, 833 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 812 SdHoareTripleChecker+Valid, 1674 SdHoareTripleChecker+Invalid, 18 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-07-22 13:18:20,183 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [812 Valid, 1674 Invalid, 18 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-07-22 13:18:20,409 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 321101 states. [2022-07-22 13:18:23,733 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 321101 to 319977. [2022-07-22 13:18:24,069 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 319977 states, 319875 states have (on average 1.563851504493943) internal successors, (500237), 319974 states have internal predecessors, (500237), 100 states have call successors, (100), 2 states have call predecessors, (100), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-22 13:18:24,709 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 319977 states to 319977 states and 500337 transitions. [2022-07-22 13:18:24,710 INFO L78 Accepts]: Start accepts. Automaton has 319977 states and 500337 transitions. Word has length 32 [2022-07-22 13:18:24,710 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-22 13:18:24,710 INFO L495 AbstractCegarLoop]: Abstraction has 319977 states and 500337 transitions. [2022-07-22 13:18:24,710 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 10.333333333333334) internal successors, (31), 2 states have internal predecessors, (31), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-22 13:18:24,710 INFO L276 IsEmpty]: Start isEmpty. Operand 319977 states and 500337 transitions. [2022-07-22 13:18:24,711 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2022-07-22 13:18:24,711 INFO L187 NwaCegarLoop]: Found error trace [2022-07-22 13:18:24,711 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-22 13:18:24,729 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-07-22 13:18:24,919 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2022-07-22 13:18:24,919 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-07-22 13:18:24,920 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-22 13:18:24,920 INFO L85 PathProgramCache]: Analyzing trace with hash -604122706, now seen corresponding path program 1 times [2022-07-22 13:18:24,920 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-22 13:18:24,920 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1886698760] [2022-07-22 13:18:24,920 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-22 13:18:24,920 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-22 13:18:24,942 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-07-22 13:18:24,945 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1076419469] [2022-07-22 13:18:24,945 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-22 13:18:24,945 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-22 13:18:24,945 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-22 13:18:24,946 INFO L229 MonitoredProcess]: Starting monitored process 12 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-22 13:18:24,948 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-07-22 13:18:25,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-22 13:18:25,055 INFO L263 TraceCheckSpWp]: Trace formula consists of 385 conjuncts, 2 conjunts are in the unsatisfiable core [2022-07-22 13:18:25,056 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-22 13:18:25,109 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-22 13:18:25,109 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-07-22 13:18:25,110 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-22 13:18:25,110 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1886698760] [2022-07-22 13:18:25,110 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-07-22 13:18:25,110 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1076419469] [2022-07-22 13:18:25,110 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1076419469] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-22 13:18:25,110 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-22 13:18:25,110 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-07-22 13:18:25,110 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1435100972] [2022-07-22 13:18:25,110 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-22 13:18:25,111 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-07-22 13:18:25,111 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-22 13:18:25,111 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-07-22 13:18:25,111 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-07-22 13:18:25,111 INFO L87 Difference]: Start difference. First operand 319977 states and 500337 transitions. Second operand has 3 states, 3 states have (on average 11.0) internal successors, (33), 2 states have internal predecessors, (33), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-22 13:18:27,227 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-22 13:18:27,227 INFO L93 Difference]: Finished difference Result 406740 states and 633592 transitions. [2022-07-22 13:18:27,228 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-07-22 13:18:27,228 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 11.0) internal successors, (33), 2 states have internal predecessors, (33), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 34 [2022-07-22 13:18:27,229 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-22 13:18:27,929 INFO L225 Difference]: With dead ends: 406740 [2022-07-22 13:18:27,929 INFO L226 Difference]: Without dead ends: 406734 [2022-07-22 13:18:27,978 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-07-22 13:18:27,979 INFO L413 NwaCegarLoop]: 841 mSDtfsCounter, 809 mSDsluCounter, 833 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 809 SdHoareTripleChecker+Valid, 1674 SdHoareTripleChecker+Invalid, 19 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-07-22 13:18:27,979 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [809 Valid, 1674 Invalid, 19 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 15 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-07-22 13:18:28,259 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 406734 states. [2022-07-22 13:18:32,332 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 406734 to 405225. [2022-07-22 13:18:32,654 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 405225 states, 405123 states have (on average 1.5561817028408655) internal successors, (630445), 405222 states have internal predecessors, (630445), 100 states have call successors, (100), 2 states have call predecessors, (100), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-22 13:18:33,628 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 405225 states to 405225 states and 630545 transitions. [2022-07-22 13:18:33,628 INFO L78 Accepts]: Start accepts. Automaton has 405225 states and 630545 transitions. Word has length 34 [2022-07-22 13:18:33,628 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-22 13:18:33,629 INFO L495 AbstractCegarLoop]: Abstraction has 405225 states and 630545 transitions. [2022-07-22 13:18:33,629 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 11.0) internal successors, (33), 2 states have internal predecessors, (33), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-22 13:18:33,629 INFO L276 IsEmpty]: Start isEmpty. Operand 405225 states and 630545 transitions. [2022-07-22 13:18:33,630 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-07-22 13:18:33,630 INFO L187 NwaCegarLoop]: Found error trace [2022-07-22 13:18:33,630 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-22 13:18:33,647 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-07-22 13:18:33,831 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2022-07-22 13:18:33,831 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-07-22 13:18:33,831 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-22 13:18:33,831 INFO L85 PathProgramCache]: Analyzing trace with hash 895742227, now seen corresponding path program 1 times [2022-07-22 13:18:33,832 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-22 13:18:33,832 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [729558346] [2022-07-22 13:18:33,832 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-22 13:18:33,832 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-22 13:18:33,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-22 13:18:33,907 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-22 13:18:33,907 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-22 13:18:33,907 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [729558346] [2022-07-22 13:18:33,908 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [729558346] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-22 13:18:33,908 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-22 13:18:33,908 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-07-22 13:18:33,908 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [139963324] [2022-07-22 13:18:33,908 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-22 13:18:33,909 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-07-22 13:18:33,909 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-22 13:18:33,909 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-07-22 13:18:33,909 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-07-22 13:18:33,909 INFO L87 Difference]: Start difference. First operand 405225 states and 630545 transitions. Second operand has 3 states, 3 states have (on average 11.333333333333334) internal successors, (34), 2 states have internal predecessors, (34), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-22 13:18:34,932 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.02s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-07-22 13:18:36,940 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-07-22 13:18:38,425 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.37s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-07-22 13:18:42,988 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-22 13:18:42,988 INFO L93 Difference]: Finished difference Result 962354 states and 1501883 transitions. [2022-07-22 13:18:42,993 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-07-22 13:18:42,994 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 11.333333333333334) internal successors, (34), 2 states have internal predecessors, (34), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 35 [2022-07-22 13:18:42,994 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-22 13:18:44,543 INFO L225 Difference]: With dead ends: 962354 [2022-07-22 13:18:44,543 INFO L226 Difference]: Without dead ends: 557131 [2022-07-22 13:18:44,685 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-07-22 13:18:44,686 INFO L413 NwaCegarLoop]: 942 mSDtfsCounter, 797 mSDsluCounter, 836 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 0 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 797 SdHoareTripleChecker+Valid, 1778 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.0s IncrementalHoareTripleChecker+Time [2022-07-22 13:18:44,686 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [797 Valid, 1778 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 12 Invalid, 1 Unknown, 0 Unchecked, 5.0s Time] [2022-07-22 13:18:45,102 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 557131 states.