./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/array-examples/sanfoundry_02_ground.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version c3fed411 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx15G -Xms4m -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/AutomizerReach.xml -i ../sv-benchmarks/c/array-examples/sanfoundry_02_ground.i -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 3a6236bdd88fd6afaea18904cacfb3d20cec5c672e4775ed237e350d1a6fc96b --- Real Ultimate output --- This is Ultimate 0.2.2-tmp.no-commuhash-c3fed41 [2021-12-16 20:34:00,680 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-12-16 20:34:00,688 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-12-16 20:34:00,721 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-12-16 20:34:00,722 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-12-16 20:34:00,724 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-12-16 20:34:00,726 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-12-16 20:34:00,731 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-12-16 20:34:00,733 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-12-16 20:34:00,738 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-12-16 20:34:00,739 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-12-16 20:34:00,740 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-12-16 20:34:00,740 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-12-16 20:34:00,743 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-12-16 20:34:00,744 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-12-16 20:34:00,745 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-12-16 20:34:00,746 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-12-16 20:34:00,746 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-12-16 20:34:00,747 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-12-16 20:34:00,749 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-12-16 20:34:00,750 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-12-16 20:34:00,751 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-12-16 20:34:00,752 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-12-16 20:34:00,752 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-12-16 20:34:00,754 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-12-16 20:34:00,755 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-12-16 20:34:00,755 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-12-16 20:34:00,756 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-12-16 20:34:00,756 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-12-16 20:34:00,757 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-12-16 20:34:00,757 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-12-16 20:34:00,758 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-12-16 20:34:00,758 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-12-16 20:34:00,759 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-12-16 20:34:00,760 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-12-16 20:34:00,760 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-12-16 20:34:00,761 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-12-16 20:34:00,761 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-12-16 20:34:00,761 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-12-16 20:34:00,762 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-12-16 20:34:00,763 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-12-16 20:34:00,771 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2021-12-16 20:34:00,802 INFO L113 SettingsManager]: Loading preferences was successful [2021-12-16 20:34:00,808 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-12-16 20:34:00,809 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-12-16 20:34:00,809 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-12-16 20:34:00,810 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-12-16 20:34:00,810 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-12-16 20:34:00,811 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-12-16 20:34:00,811 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-12-16 20:34:00,811 INFO L138 SettingsManager]: * Use SBE=true [2021-12-16 20:34:00,811 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-12-16 20:34:00,812 INFO L138 SettingsManager]: * sizeof long=4 [2021-12-16 20:34:00,812 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-12-16 20:34:00,813 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-12-16 20:34:00,813 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-12-16 20:34:00,813 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-12-16 20:34:00,813 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-12-16 20:34:00,813 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-12-16 20:34:00,814 INFO L138 SettingsManager]: * sizeof long double=12 [2021-12-16 20:34:00,814 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-12-16 20:34:00,814 INFO L138 SettingsManager]: * Use constant arrays=true [2021-12-16 20:34:00,814 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-12-16 20:34:00,814 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-12-16 20:34:00,815 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-12-16 20:34:00,815 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-12-16 20:34:00,815 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-16 20:34:00,815 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-12-16 20:34:00,815 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-12-16 20:34:00,817 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-12-16 20:34:00,817 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-12-16 20:34:00,817 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-12-16 20:34:00,817 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-12-16 20:34:00,817 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-12-16 20:34:00,818 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-12-16 20:34:00,818 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-12-16 20:34:00,818 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 3a6236bdd88fd6afaea18904cacfb3d20cec5c672e4775ed237e350d1a6fc96b [2021-12-16 20:34:01,009 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-12-16 20:34:01,028 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-12-16 20:34:01,030 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-12-16 20:34:01,030 INFO L271 PluginConnector]: Initializing CDTParser... [2021-12-16 20:34:01,031 INFO L275 PluginConnector]: CDTParser initialized [2021-12-16 20:34:01,031 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/array-examples/sanfoundry_02_ground.i [2021-12-16 20:34:01,099 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6b2b842f9/bfccb7bf7f1e404cb1cf4b450a5b703d/FLAG9a17d9c3b [2021-12-16 20:34:01,455 INFO L306 CDTParser]: Found 1 translation units. [2021-12-16 20:34:01,455 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-examples/sanfoundry_02_ground.i [2021-12-16 20:34:01,461 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6b2b842f9/bfccb7bf7f1e404cb1cf4b450a5b703d/FLAG9a17d9c3b [2021-12-16 20:34:01,474 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6b2b842f9/bfccb7bf7f1e404cb1cf4b450a5b703d [2021-12-16 20:34:01,481 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-12-16 20:34:01,483 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-12-16 20:34:01,484 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-12-16 20:34:01,484 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-12-16 20:34:01,490 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-12-16 20:34:01,491 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 16.12 08:34:01" (1/1) ... [2021-12-16 20:34:01,492 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3a1a1696 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.12 08:34:01, skipping insertion in model container [2021-12-16 20:34:01,492 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 16.12 08:34:01" (1/1) ... [2021-12-16 20:34:01,498 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-12-16 20:34:01,511 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-12-16 20:34:01,665 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-examples/sanfoundry_02_ground.i[813,826] [2021-12-16 20:34:01,682 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-16 20:34:01,688 INFO L203 MainTranslator]: Completed pre-run [2021-12-16 20:34:01,698 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-examples/sanfoundry_02_ground.i[813,826] [2021-12-16 20:34:01,706 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-16 20:34:01,717 INFO L208 MainTranslator]: Completed translation [2021-12-16 20:34:01,717 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.12 08:34:01 WrapperNode [2021-12-16 20:34:01,717 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-12-16 20:34:01,719 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-12-16 20:34:01,719 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-12-16 20:34:01,719 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-12-16 20:34:01,725 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.12 08:34:01" (1/1) ... [2021-12-16 20:34:01,740 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.12 08:34:01" (1/1) ... [2021-12-16 20:34:01,761 INFO L137 Inliner]: procedures = 16, calls = 21, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 93 [2021-12-16 20:34:01,762 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-12-16 20:34:01,763 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-12-16 20:34:01,763 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-12-16 20:34:01,764 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-12-16 20:34:01,771 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.12 08:34:01" (1/1) ... [2021-12-16 20:34:01,771 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.12 08:34:01" (1/1) ... [2021-12-16 20:34:01,775 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.12 08:34:01" (1/1) ... [2021-12-16 20:34:01,776 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.12 08:34:01" (1/1) ... [2021-12-16 20:34:01,790 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.12 08:34:01" (1/1) ... [2021-12-16 20:34:01,794 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.12 08:34:01" (1/1) ... [2021-12-16 20:34:01,800 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.12 08:34:01" (1/1) ... [2021-12-16 20:34:01,804 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-12-16 20:34:01,806 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-12-16 20:34:01,806 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-12-16 20:34:01,806 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-12-16 20:34:01,808 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.12 08:34:01" (1/1) ... [2021-12-16 20:34:01,814 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-16 20:34:01,824 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-16 20:34:01,836 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-12-16 20:34:01,863 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-12-16 20:34:01,883 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-12-16 20:34:01,883 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-12-16 20:34:01,883 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-12-16 20:34:01,884 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-12-16 20:34:01,884 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-12-16 20:34:01,884 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-12-16 20:34:01,884 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-12-16 20:34:01,884 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-12-16 20:34:01,884 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-12-16 20:34:01,885 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-12-16 20:34:01,948 INFO L236 CfgBuilder]: Building ICFG [2021-12-16 20:34:01,950 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-12-16 20:34:02,088 INFO L277 CfgBuilder]: Performing block encoding [2021-12-16 20:34:02,103 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-12-16 20:34:02,104 INFO L301 CfgBuilder]: Removed 4 assume(true) statements. [2021-12-16 20:34:02,105 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 16.12 08:34:02 BoogieIcfgContainer [2021-12-16 20:34:02,105 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-12-16 20:34:02,120 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-12-16 20:34:02,120 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-12-16 20:34:02,129 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-12-16 20:34:02,129 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 16.12 08:34:01" (1/3) ... [2021-12-16 20:34:02,130 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@33d136ea and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 16.12 08:34:02, skipping insertion in model container [2021-12-16 20:34:02,130 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.12 08:34:01" (2/3) ... [2021-12-16 20:34:02,131 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@33d136ea and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 16.12 08:34:02, skipping insertion in model container [2021-12-16 20:34:02,131 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 16.12 08:34:02" (3/3) ... [2021-12-16 20:34:02,132 INFO L111 eAbstractionObserver]: Analyzing ICFG sanfoundry_02_ground.i [2021-12-16 20:34:02,136 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-12-16 20:34:02,151 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-12-16 20:34:02,207 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-12-16 20:34:02,214 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-12-16 20:34:02,214 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-12-16 20:34:02,228 INFO L276 IsEmpty]: Start isEmpty. Operand has 32 states, 27 states have (on average 1.5185185185185186) internal successors, (41), 28 states have internal predecessors, (41), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-16 20:34:02,233 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-12-16 20:34:02,233 INFO L506 BasicCegarLoop]: Found error trace [2021-12-16 20:34:02,234 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-16 20:34:02,234 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-16 20:34:02,239 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-16 20:34:02,239 INFO L85 PathProgramCache]: Analyzing trace with hash -751891331, now seen corresponding path program 1 times [2021-12-16 20:34:02,247 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-16 20:34:02,248 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1256847762] [2021-12-16 20:34:02,248 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 20:34:02,249 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-16 20:34:02,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:34:02,408 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-16 20:34:02,408 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-16 20:34:02,409 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1256847762] [2021-12-16 20:34:02,410 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1256847762] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-16 20:34:02,410 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-16 20:34:02,410 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-12-16 20:34:02,412 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [328632897] [2021-12-16 20:34:02,412 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-16 20:34:02,416 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-16 20:34:02,416 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-16 20:34:02,446 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-16 20:34:02,448 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-16 20:34:02,450 INFO L87 Difference]: Start difference. First operand has 32 states, 27 states have (on average 1.5185185185185186) internal successors, (41), 28 states have internal predecessors, (41), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Second operand has 3 states, 3 states have (on average 4.0) internal successors, (12), 3 states have internal predecessors, (12), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-16 20:34:02,526 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-16 20:34:02,526 INFO L93 Difference]: Finished difference Result 62 states and 90 transitions. [2021-12-16 20:34:02,528 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-16 20:34:02,529 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 3 states have internal predecessors, (12), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2021-12-16 20:34:02,529 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-16 20:34:02,538 INFO L225 Difference]: With dead ends: 62 [2021-12-16 20:34:02,538 INFO L226 Difference]: Without dead ends: 30 [2021-12-16 20:34:02,541 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-16 20:34:02,545 INFO L933 BasicCegarLoop]: 38 mSDtfsCounter, 1 mSDsluCounter, 29 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 67 SdHoareTripleChecker+Invalid, 12 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-16 20:34:02,547 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 67 Invalid, 12 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-16 20:34:02,560 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-12-16 20:34:02,581 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2021-12-16 20:34:02,583 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 25 states have (on average 1.32) internal successors, (33), 25 states have internal predecessors, (33), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-16 20:34:02,584 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 37 transitions. [2021-12-16 20:34:02,585 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 37 transitions. Word has length 13 [2021-12-16 20:34:02,586 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-16 20:34:02,586 INFO L470 AbstractCegarLoop]: Abstraction has 29 states and 37 transitions. [2021-12-16 20:34:02,587 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 3 states have internal predecessors, (12), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-16 20:34:02,588 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 37 transitions. [2021-12-16 20:34:02,590 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-12-16 20:34:02,590 INFO L506 BasicCegarLoop]: Found error trace [2021-12-16 20:34:02,590 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-16 20:34:02,591 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-12-16 20:34:02,591 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-16 20:34:02,594 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-16 20:34:02,595 INFO L85 PathProgramCache]: Analyzing trace with hash -431376725, now seen corresponding path program 1 times [2021-12-16 20:34:02,595 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-16 20:34:02,596 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [122429110] [2021-12-16 20:34:02,596 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 20:34:02,596 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-16 20:34:02,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:34:02,664 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-16 20:34:02,664 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-16 20:34:02,665 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [122429110] [2021-12-16 20:34:02,665 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [122429110] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-16 20:34:02,666 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1914713424] [2021-12-16 20:34:02,666 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 20:34:02,666 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-16 20:34:02,666 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-16 20:34:02,672 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-16 20:34:02,674 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-12-16 20:34:02,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:34:02,736 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 2 conjunts are in the unsatisfiable core [2021-12-16 20:34:02,742 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-16 20:34:02,796 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-16 20:34:02,797 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-16 20:34:02,798 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1914713424] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-16 20:34:02,800 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-12-16 20:34:02,801 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 5 [2021-12-16 20:34:02,801 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [851604270] [2021-12-16 20:34:02,803 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-16 20:34:02,804 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-16 20:34:02,804 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-16 20:34:02,805 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-16 20:34:02,805 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-12-16 20:34:02,806 INFO L87 Difference]: Start difference. First operand 29 states and 37 transitions. Second operand has 3 states, 3 states have (on average 4.666666666666667) internal successors, (14), 3 states have internal predecessors, (14), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-16 20:34:02,845 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-16 20:34:02,846 INFO L93 Difference]: Finished difference Result 51 states and 65 transitions. [2021-12-16 20:34:02,847 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-16 20:34:02,847 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.666666666666667) internal successors, (14), 3 states have internal predecessors, (14), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2021-12-16 20:34:02,850 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-16 20:34:02,851 INFO L225 Difference]: With dead ends: 51 [2021-12-16 20:34:02,852 INFO L226 Difference]: Without dead ends: 34 [2021-12-16 20:34:02,853 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-12-16 20:34:02,855 INFO L933 BasicCegarLoop]: 29 mSDtfsCounter, 6 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 54 SdHoareTripleChecker+Invalid, 17 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-16 20:34:02,855 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 54 Invalid, 17 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 16 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-16 20:34:02,856 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-12-16 20:34:02,859 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 30. [2021-12-16 20:34:02,860 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 26 states have (on average 1.3076923076923077) internal successors, (34), 26 states have internal predecessors, (34), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-16 20:34:02,861 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 38 transitions. [2021-12-16 20:34:02,861 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 38 transitions. Word has length 15 [2021-12-16 20:34:02,861 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-16 20:34:02,861 INFO L470 AbstractCegarLoop]: Abstraction has 30 states and 38 transitions. [2021-12-16 20:34:02,862 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.666666666666667) internal successors, (14), 3 states have internal predecessors, (14), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-16 20:34:02,862 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 38 transitions. [2021-12-16 20:34:02,862 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-12-16 20:34:02,863 INFO L506 BasicCegarLoop]: Found error trace [2021-12-16 20:34:02,863 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-16 20:34:02,890 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-12-16 20:34:03,082 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-16 20:34:03,082 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-16 20:34:03,083 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-16 20:34:03,083 INFO L85 PathProgramCache]: Analyzing trace with hash 1763712837, now seen corresponding path program 1 times [2021-12-16 20:34:03,083 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-16 20:34:03,083 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1762078367] [2021-12-16 20:34:03,083 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 20:34:03,083 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-16 20:34:03,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:34:03,122 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-16 20:34:03,123 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-16 20:34:03,123 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1762078367] [2021-12-16 20:34:03,123 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1762078367] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-16 20:34:03,124 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1600880521] [2021-12-16 20:34:03,124 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 20:34:03,124 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-16 20:34:03,124 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-16 20:34:03,125 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-16 20:34:03,127 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-12-16 20:34:03,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:34:03,175 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 3 conjunts are in the unsatisfiable core [2021-12-16 20:34:03,177 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-16 20:34:03,251 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-16 20:34:03,253 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-16 20:34:03,323 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-16 20:34:03,323 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1600880521] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-16 20:34:03,324 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-16 20:34:03,324 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2021-12-16 20:34:03,324 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1453623944] [2021-12-16 20:34:03,324 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-16 20:34:03,325 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-12-16 20:34:03,325 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-16 20:34:03,326 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-12-16 20:34:03,326 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2021-12-16 20:34:03,326 INFO L87 Difference]: Start difference. First operand 30 states and 38 transitions. Second operand has 7 states, 7 states have (on average 3.4285714285714284) internal successors, (24), 7 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) [2021-12-16 20:34:03,366 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-16 20:34:03,366 INFO L93 Difference]: Finished difference Result 65 states and 86 transitions. [2021-12-16 20:34:03,367 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-16 20:34:03,367 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.4285714285714284) internal successors, (24), 7 states have internal predecessors, (24), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2021-12-16 20:34:03,367 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-16 20:34:03,368 INFO L225 Difference]: With dead ends: 65 [2021-12-16 20:34:03,368 INFO L226 Difference]: Without dead ends: 40 [2021-12-16 20:34:03,369 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2021-12-16 20:34:03,370 INFO L933 BasicCegarLoop]: 29 mSDtfsCounter, 16 mSDsluCounter, 51 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 80 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-16 20:34:03,370 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 80 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-16 20:34:03,371 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2021-12-16 20:34:03,375 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2021-12-16 20:34:03,375 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 36 states have (on average 1.2777777777777777) internal successors, (46), 36 states have internal predecessors, (46), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-16 20:34:03,376 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 50 transitions. [2021-12-16 20:34:03,376 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 50 transitions. Word has length 18 [2021-12-16 20:34:03,376 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-16 20:34:03,377 INFO L470 AbstractCegarLoop]: Abstraction has 40 states and 50 transitions. [2021-12-16 20:34:03,377 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.4285714285714284) internal successors, (24), 7 states have internal predecessors, (24), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-16 20:34:03,377 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 50 transitions. [2021-12-16 20:34:03,378 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-12-16 20:34:03,378 INFO L506 BasicCegarLoop]: Found error trace [2021-12-16 20:34:03,378 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-16 20:34:03,403 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-12-16 20:34:03,595 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-12-16 20:34:03,596 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-16 20:34:03,596 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-16 20:34:03,596 INFO L85 PathProgramCache]: Analyzing trace with hash 1149964965, now seen corresponding path program 2 times [2021-12-16 20:34:03,596 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-16 20:34:03,596 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1959607250] [2021-12-16 20:34:03,597 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 20:34:03,597 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-16 20:34:03,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:34:03,696 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-12-16 20:34:03,696 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-16 20:34:03,696 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1959607250] [2021-12-16 20:34:03,696 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1959607250] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-16 20:34:03,697 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [803572847] [2021-12-16 20:34:03,697 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-16 20:34:03,697 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-16 20:34:03,697 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-16 20:34:03,698 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-16 20:34:03,700 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-12-16 20:34:03,767 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-16 20:34:03,767 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-16 20:34:03,768 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 6 conjunts are in the unsatisfiable core [2021-12-16 20:34:03,770 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-16 20:34:03,857 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-12-16 20:34:03,857 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-16 20:34:03,950 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-12-16 20:34:03,951 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [803572847] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-16 20:34:03,951 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-16 20:34:03,951 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 7, 7] total 13 [2021-12-16 20:34:03,951 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [717559587] [2021-12-16 20:34:03,952 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-16 20:34:03,952 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-12-16 20:34:03,952 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-16 20:34:03,953 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-12-16 20:34:03,953 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=80, Unknown=0, NotChecked=0, Total=156 [2021-12-16 20:34:03,953 INFO L87 Difference]: Start difference. First operand 40 states and 50 transitions. Second operand has 13 states, 13 states have (on average 3.6153846153846154) internal successors, (47), 13 states have internal predecessors, (47), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-16 20:34:04,068 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-16 20:34:04,068 INFO L93 Difference]: Finished difference Result 105 states and 148 transitions. [2021-12-16 20:34:04,069 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-12-16 20:34:04,069 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 3.6153846153846154) internal successors, (47), 13 states have internal predecessors, (47), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 27 [2021-12-16 20:34:04,069 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-16 20:34:04,070 INFO L225 Difference]: With dead ends: 105 [2021-12-16 20:34:04,070 INFO L226 Difference]: Without dead ends: 76 [2021-12-16 20:34:04,071 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 46 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=76, Invalid=80, Unknown=0, NotChecked=0, Total=156 [2021-12-16 20:34:04,072 INFO L933 BasicCegarLoop]: 29 mSDtfsCounter, 82 mSDsluCounter, 129 mSDsCounter, 0 mSdLazyCounter, 86 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 82 SdHoareTripleChecker+Valid, 158 SdHoareTripleChecker+Invalid, 116 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 86 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-16 20:34:04,072 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [82 Valid, 158 Invalid, 116 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 86 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-16 20:34:04,073 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2021-12-16 20:34:04,078 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 76. [2021-12-16 20:34:04,079 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 72 states have (on average 1.3055555555555556) internal successors, (94), 72 states have internal predecessors, (94), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-16 20:34:04,080 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 98 transitions. [2021-12-16 20:34:04,080 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 98 transitions. Word has length 27 [2021-12-16 20:34:04,081 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-16 20:34:04,081 INFO L470 AbstractCegarLoop]: Abstraction has 76 states and 98 transitions. [2021-12-16 20:34:04,081 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 3.6153846153846154) internal successors, (47), 13 states have internal predecessors, (47), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-16 20:34:04,081 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 98 transitions. [2021-12-16 20:34:04,082 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-12-16 20:34:04,082 INFO L506 BasicCegarLoop]: Found error trace [2021-12-16 20:34:04,083 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-16 20:34:04,103 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-12-16 20:34:04,295 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-16 20:34:04,296 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-16 20:34:04,296 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-16 20:34:04,296 INFO L85 PathProgramCache]: Analyzing trace with hash 1960305241, now seen corresponding path program 3 times [2021-12-16 20:34:04,296 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-16 20:34:04,296 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1433051190] [2021-12-16 20:34:04,297 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 20:34:04,297 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-16 20:34:04,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:34:04,495 INFO L134 CoverageAnalysis]: Checked inductivity of 192 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2021-12-16 20:34:04,496 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-16 20:34:04,496 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1433051190] [2021-12-16 20:34:04,496 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1433051190] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-16 20:34:04,496 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1930951601] [2021-12-16 20:34:04,496 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-16 20:34:04,497 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-16 20:34:04,497 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-16 20:34:04,498 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-16 20:34:04,504 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-12-16 20:34:04,598 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2021-12-16 20:34:04,599 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-16 20:34:04,601 INFO L263 TraceCheckSpWp]: Trace formula consists of 216 conjuncts, 10 conjunts are in the unsatisfiable core [2021-12-16 20:34:04,603 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-16 20:34:04,726 INFO L134 CoverageAnalysis]: Checked inductivity of 192 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-12-16 20:34:04,727 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-16 20:34:04,998 INFO L134 CoverageAnalysis]: Checked inductivity of 192 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-12-16 20:34:04,998 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1930951601] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-16 20:34:04,998 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-16 20:34:04,998 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 11, 11] total 22 [2021-12-16 20:34:04,999 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [283896305] [2021-12-16 20:34:04,999 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-16 20:34:04,999 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-12-16 20:34:04,999 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-16 20:34:05,000 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-12-16 20:34:05,000 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=231, Invalid=231, Unknown=0, NotChecked=0, Total=462 [2021-12-16 20:34:05,001 INFO L87 Difference]: Start difference. First operand 76 states and 98 transitions. Second operand has 22 states, 22 states have (on average 4.2272727272727275) internal successors, (93), 22 states have internal predecessors, (93), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-16 20:34:05,238 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-16 20:34:05,239 INFO L93 Difference]: Finished difference Result 189 states and 272 transitions. [2021-12-16 20:34:05,239 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-12-16 20:34:05,239 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 4.2272727272727275) internal successors, (93), 22 states have internal predecessors, (93), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 57 [2021-12-16 20:34:05,240 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-16 20:34:05,241 INFO L225 Difference]: With dead ends: 189 [2021-12-16 20:34:05,242 INFO L226 Difference]: Without dead ends: 136 [2021-12-16 20:34:05,242 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 105 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=231, Invalid=231, Unknown=0, NotChecked=0, Total=462 [2021-12-16 20:34:05,243 INFO L933 BasicCegarLoop]: 29 mSDtfsCounter, 237 mSDsluCounter, 90 mSDsCounter, 0 mSdLazyCounter, 143 mSolverCounterSat, 94 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 237 SdHoareTripleChecker+Valid, 119 SdHoareTripleChecker+Invalid, 237 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 94 IncrementalHoareTripleChecker+Valid, 143 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-16 20:34:05,243 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [237 Valid, 119 Invalid, 237 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [94 Valid, 143 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-16 20:34:05,244 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2021-12-16 20:34:05,252 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 136. [2021-12-16 20:34:05,253 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 136 states, 132 states have (on average 1.3181818181818181) internal successors, (174), 132 states have internal predecessors, (174), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-16 20:34:05,254 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 178 transitions. [2021-12-16 20:34:05,254 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 178 transitions. Word has length 57 [2021-12-16 20:34:05,254 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-16 20:34:05,255 INFO L470 AbstractCegarLoop]: Abstraction has 136 states and 178 transitions. [2021-12-16 20:34:05,255 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 4.2272727272727275) internal successors, (93), 22 states have internal predecessors, (93), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-16 20:34:05,255 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 178 transitions. [2021-12-16 20:34:05,258 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2021-12-16 20:34:05,258 INFO L506 BasicCegarLoop]: Found error trace [2021-12-16 20:34:05,258 INFO L514 BasicCegarLoop]: trace histogram [20, 20, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-16 20:34:05,275 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-12-16 20:34:05,463 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-16 20:34:05,463 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-16 20:34:05,464 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-16 20:34:05,464 INFO L85 PathProgramCache]: Analyzing trace with hash 2113477765, now seen corresponding path program 4 times [2021-12-16 20:34:05,464 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-16 20:34:05,464 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1314128903] [2021-12-16 20:34:05,464 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 20:34:05,464 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-16 20:34:05,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:34:05,820 INFO L134 CoverageAnalysis]: Checked inductivity of 877 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 477 trivial. 0 not checked. [2021-12-16 20:34:05,820 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-16 20:34:05,820 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1314128903] [2021-12-16 20:34:05,821 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1314128903] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-16 20:34:05,821 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [492639105] [2021-12-16 20:34:05,821 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-16 20:34:05,821 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-16 20:34:05,821 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-16 20:34:05,822 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-16 20:34:05,829 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-12-16 20:34:05,949 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-16 20:34:05,950 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-16 20:34:05,953 INFO L263 TraceCheckSpWp]: Trace formula consists of 424 conjuncts, 22 conjunts are in the unsatisfiable core [2021-12-16 20:34:05,956 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-16 20:34:06,162 INFO L134 CoverageAnalysis]: Checked inductivity of 877 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 477 trivial. 0 not checked. [2021-12-16 20:34:06,162 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-16 20:34:06,897 INFO L134 CoverageAnalysis]: Checked inductivity of 877 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 477 trivial. 0 not checked. [2021-12-16 20:34:06,897 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [492639105] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-16 20:34:06,897 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-16 20:34:06,897 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 45 [2021-12-16 20:34:06,897 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [602422267] [2021-12-16 20:34:06,898 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-16 20:34:06,898 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2021-12-16 20:34:06,898 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-16 20:34:06,899 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-12-16 20:34:06,900 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=990, Invalid=990, Unknown=0, NotChecked=0, Total=1980 [2021-12-16 20:34:06,900 INFO L87 Difference]: Start difference. First operand 136 states and 178 transitions. Second operand has 45 states, 45 states have (on average 2.2222222222222223) internal successors, (100), 45 states have internal predecessors, (100), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-16 20:34:07,345 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-16 20:34:07,345 INFO L93 Difference]: Finished difference Result 361 states and 532 transitions. [2021-12-16 20:34:07,346 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-12-16 20:34:07,346 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 2.2222222222222223) internal successors, (100), 45 states have internal predecessors, (100), 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 107 [2021-12-16 20:34:07,346 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-16 20:34:07,348 INFO L225 Difference]: With dead ends: 361 [2021-12-16 20:34:07,348 INFO L226 Difference]: Without dead ends: 268 [2021-12-16 20:34:07,349 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 235 GetRequests, 192 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 80 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=990, Invalid=990, Unknown=0, NotChecked=0, Total=1980 [2021-12-16 20:34:07,350 INFO L933 BasicCegarLoop]: 29 mSDtfsCounter, 698 mSDsluCounter, 137 mSDsCounter, 0 mSdLazyCounter, 304 mSolverCounterSat, 175 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 698 SdHoareTripleChecker+Valid, 166 SdHoareTripleChecker+Invalid, 479 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 175 IncrementalHoareTripleChecker+Valid, 304 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-16 20:34:07,350 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [698 Valid, 166 Invalid, 479 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [175 Valid, 304 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-12-16 20:34:07,351 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 268 states. [2021-12-16 20:34:07,363 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 268 to 268. [2021-12-16 20:34:07,364 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 268 states, 264 states have (on average 1.3257575757575757) internal successors, (350), 264 states have internal predecessors, (350), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-16 20:34:07,366 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 268 states to 268 states and 354 transitions. [2021-12-16 20:34:07,366 INFO L78 Accepts]: Start accepts. Automaton has 268 states and 354 transitions. Word has length 107 [2021-12-16 20:34:07,367 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-16 20:34:07,367 INFO L470 AbstractCegarLoop]: Abstraction has 268 states and 354 transitions. [2021-12-16 20:34:07,367 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 45 states have (on average 2.2222222222222223) internal successors, (100), 45 states have internal predecessors, (100), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-16 20:34:07,367 INFO L276 IsEmpty]: Start isEmpty. Operand 268 states and 354 transitions. [2021-12-16 20:34:07,370 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 218 [2021-12-16 20:34:07,370 INFO L506 BasicCegarLoop]: Found error trace [2021-12-16 20:34:07,371 INFO L514 BasicCegarLoop]: trace histogram [42, 42, 40, 40, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-16 20:34:07,392 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-12-16 20:34:07,584 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-16 20:34:07,587 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-16 20:34:07,587 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-16 20:34:07,587 INFO L85 PathProgramCache]: Analyzing trace with hash -2000652775, now seen corresponding path program 5 times [2021-12-16 20:34:07,587 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-16 20:34:07,587 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2126852826] [2021-12-16 20:34:07,588 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 20:34:07,588 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-16 20:34:07,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:34:08,569 INFO L134 CoverageAnalysis]: Checked inductivity of 4144 backedges. 0 proven. 1764 refuted. 0 times theorem prover too weak. 2380 trivial. 0 not checked. [2021-12-16 20:34:08,569 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-16 20:34:08,569 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2126852826] [2021-12-16 20:34:08,570 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2126852826] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-16 20:34:08,570 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2077382462] [2021-12-16 20:34:08,570 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-12-16 20:34:08,570 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-16 20:34:08,570 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-16 20:34:08,571 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-16 20:34:08,573 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-12-16 20:34:32,460 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 43 check-sat command(s) [2021-12-16 20:34:32,461 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-16 20:34:32,503 INFO L263 TraceCheckSpWp]: Trace formula consists of 842 conjuncts, 42 conjunts are in the unsatisfiable core [2021-12-16 20:34:32,509 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-16 20:34:32,920 INFO L134 CoverageAnalysis]: Checked inductivity of 4144 backedges. 0 proven. 2380 refuted. 0 times theorem prover too weak. 1764 trivial. 0 not checked. [2021-12-16 20:34:32,920 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-16 20:34:35,027 INFO L134 CoverageAnalysis]: Checked inductivity of 4144 backedges. 0 proven. 2380 refuted. 0 times theorem prover too weak. 1764 trivial. 0 not checked. [2021-12-16 20:34:35,027 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2077382462] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-16 20:34:35,027 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-16 20:34:35,027 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 43, 43] total 86 [2021-12-16 20:34:35,027 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [126706061] [2021-12-16 20:34:35,027 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-16 20:34:35,028 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 86 states [2021-12-16 20:34:35,028 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-16 20:34:35,030 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 86 interpolants. [2021-12-16 20:34:35,032 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3655, Invalid=3655, Unknown=0, NotChecked=0, Total=7310 [2021-12-16 20:34:35,033 INFO L87 Difference]: Start difference. First operand 268 states and 354 transitions. Second operand has 86 states, 86 states have (on average 4.058139534883721) internal successors, (349), 86 states have internal predecessors, (349), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-16 20:34:36,345 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-16 20:34:36,346 INFO L93 Difference]: Finished difference Result 701 states and 1040 transitions. [2021-12-16 20:34:36,346 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2021-12-16 20:34:36,346 INFO L78 Accepts]: Start accepts. Automaton has has 86 states, 86 states have (on average 4.058139534883721) internal successors, (349), 86 states have internal predecessors, (349), 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 217 [2021-12-16 20:34:36,346 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-16 20:34:36,348 INFO L225 Difference]: With dead ends: 701 [2021-12-16 20:34:36,349 INFO L226 Difference]: Without dead ends: 520 [2021-12-16 20:34:36,351 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 477 GetRequests, 393 SyntacticMatches, 0 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=3655, Invalid=3655, Unknown=0, NotChecked=0, Total=7310 [2021-12-16 20:34:36,352 INFO L933 BasicCegarLoop]: 29 mSDtfsCounter, 1478 mSDsluCounter, 227 mSDsCounter, 0 mSdLazyCounter, 604 mSolverCounterSat, 445 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1478 SdHoareTripleChecker+Valid, 256 SdHoareTripleChecker+Invalid, 1049 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 445 IncrementalHoareTripleChecker+Valid, 604 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-12-16 20:34:36,352 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1478 Valid, 256 Invalid, 1049 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [445 Valid, 604 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-12-16 20:34:36,353 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 520 states. [2021-12-16 20:34:36,369 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 520 to 520. [2021-12-16 20:34:36,370 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 520 states, 516 states have (on average 1.3294573643410852) internal successors, (686), 516 states have internal predecessors, (686), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-16 20:34:36,373 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 520 states to 520 states and 690 transitions. [2021-12-16 20:34:36,373 INFO L78 Accepts]: Start accepts. Automaton has 520 states and 690 transitions. Word has length 217 [2021-12-16 20:34:36,373 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-16 20:34:36,373 INFO L470 AbstractCegarLoop]: Abstraction has 520 states and 690 transitions. [2021-12-16 20:34:36,374 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 86 states, 86 states have (on average 4.058139534883721) internal successors, (349), 86 states have internal predecessors, (349), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-16 20:34:36,374 INFO L276 IsEmpty]: Start isEmpty. Operand 520 states and 690 transitions. [2021-12-16 20:34:36,381 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 428 [2021-12-16 20:34:36,381 INFO L506 BasicCegarLoop]: Found error trace [2021-12-16 20:34:36,381 INFO L514 BasicCegarLoop]: trace histogram [84, 84, 82, 82, 82, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-16 20:34:36,421 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2021-12-16 20:34:36,607 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-16 20:34:36,608 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-16 20:34:36,608 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-16 20:34:36,608 INFO L85 PathProgramCache]: Analyzing trace with hash -1429388283, now seen corresponding path program 6 times [2021-12-16 20:34:36,608 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-16 20:34:36,608 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [941688027] [2021-12-16 20:34:36,609 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 20:34:36,609 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-16 20:34:36,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 20:34:39,513 INFO L134 CoverageAnalysis]: Checked inductivity of 17101 backedges. 0 proven. 7056 refuted. 0 times theorem prover too weak. 10045 trivial. 0 not checked. [2021-12-16 20:34:39,514 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-16 20:34:39,514 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [941688027] [2021-12-16 20:34:39,514 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [941688027] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-16 20:34:39,514 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [843405148] [2021-12-16 20:34:39,514 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-12-16 20:34:39,514 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-16 20:34:39,515 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-16 20:34:39,520 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-16 20:34:39,521 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process Killed by 15