./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/verifythis/prefixsum_rec.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 7e70badd Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e71f7eb-5b8c-4382-813c-d0d21d627740/bin/uautomizer-wIGwrQj20G/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e71f7eb-5b8c-4382-813c-d0d21d627740/bin/uautomizer-wIGwrQj20G/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e71f7eb-5b8c-4382-813c-d0d21d627740/bin/uautomizer-wIGwrQj20G/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e71f7eb-5b8c-4382-813c-d0d21d627740/bin/uautomizer-wIGwrQj20G/config/AutomizerReach.xml -i ../../sv-benchmarks/c/verifythis/prefixsum_rec.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e71f7eb-5b8c-4382-813c-d0d21d627740/bin/uautomizer-wIGwrQj20G/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e71f7eb-5b8c-4382-813c-d0d21d627740/bin/uautomizer-wIGwrQj20G --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 81bdf17d0130e934dcb31a2f76f595e947b99d6273334b7f05365a624466aeab --- Real Ultimate output --- This is Ultimate 0.2.1-dev-7e70bad [2021-11-23 13:38:00,615 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 13:38:00,617 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 13:38:00,652 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 13:38:00,653 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 13:38:00,654 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 13:38:00,656 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 13:38:00,659 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 13:38:00,662 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 13:38:00,663 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 13:38:00,664 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 13:38:00,666 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 13:38:00,666 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 13:38:00,668 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 13:38:00,670 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 13:38:00,672 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 13:38:00,673 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 13:38:00,674 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 13:38:00,677 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 13:38:00,680 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 13:38:00,682 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 13:38:00,684 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 13:38:00,686 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 13:38:00,687 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 13:38:00,691 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 13:38:00,692 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 13:38:00,692 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 13:38:00,693 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 13:38:00,694 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 13:38:00,695 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 13:38:00,696 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 13:38:00,697 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 13:38:00,698 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 13:38:00,699 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 13:38:00,700 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 13:38:00,701 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 13:38:00,702 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 13:38:00,702 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 13:38:00,702 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 13:38:00,704 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 13:38:00,705 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 13:38:00,705 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e71f7eb-5b8c-4382-813c-d0d21d627740/bin/uautomizer-wIGwrQj20G/config/svcomp-Reach-32bit-Automizer_Default.epf [2021-11-23 13:38:00,734 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 13:38:00,734 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 13:38:00,734 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 13:38:00,735 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 13:38:00,736 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-23 13:38:00,736 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-23 13:38:00,736 INFO L138 SettingsManager]: * Use SBE=true [2021-11-23 13:38:00,737 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 13:38:00,737 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 13:38:00,737 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 13:38:00,737 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 13:38:00,737 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 13:38:00,738 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 13:38:00,738 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 13:38:00,738 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 13:38:00,738 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 13:38:00,738 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 13:38:00,739 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 13:38:00,739 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 13:38:00,739 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 13:38:00,739 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-23 13:38:00,740 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 13:38:00,740 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 13:38:00,740 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 13:38:00,740 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 13:38:00,740 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 13:38:00,741 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-11-23 13:38:00,741 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 13:38:00,741 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-11-23 13:38:00,741 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-11-23 13:38:00,741 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 13:38:00,742 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 13:38:00,742 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:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e71f7eb-5b8c-4382-813c-d0d21d627740/bin/uautomizer-wIGwrQj20G/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e71f7eb-5b8c-4382-813c-d0d21d627740/bin/uautomizer-wIGwrQj20G Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 81bdf17d0130e934dcb31a2f76f595e947b99d6273334b7f05365a624466aeab [2021-11-23 13:38:01,021 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 13:38:01,042 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 13:38:01,044 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 13:38:01,045 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 13:38:01,051 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 13:38:01,052 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e71f7eb-5b8c-4382-813c-d0d21d627740/bin/uautomizer-wIGwrQj20G/../../sv-benchmarks/c/verifythis/prefixsum_rec.c [2021-11-23 13:38:01,134 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e71f7eb-5b8c-4382-813c-d0d21d627740/bin/uautomizer-wIGwrQj20G/data/fbad8c521/d899d453ee69438c844832656e9f3851/FLAGe4e77da46 [2021-11-23 13:38:01,705 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 13:38:01,707 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e71f7eb-5b8c-4382-813c-d0d21d627740/sv-benchmarks/c/verifythis/prefixsum_rec.c [2021-11-23 13:38:01,722 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e71f7eb-5b8c-4382-813c-d0d21d627740/bin/uautomizer-wIGwrQj20G/data/fbad8c521/d899d453ee69438c844832656e9f3851/FLAGe4e77da46 [2021-11-23 13:38:02,044 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e71f7eb-5b8c-4382-813c-d0d21d627740/bin/uautomizer-wIGwrQj20G/data/fbad8c521/d899d453ee69438c844832656e9f3851 [2021-11-23 13:38:02,047 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 13:38:02,049 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 13:38:02,050 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 13:38:02,051 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 13:38:02,055 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 13:38:02,055 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 01:38:02" (1/1) ... [2021-11-23 13:38:02,057 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6426420e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:38:02, skipping insertion in model container [2021-11-23 13:38:02,057 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 01:38:02" (1/1) ... [2021-11-23 13:38:02,063 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 13:38:02,087 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 13:38:02,271 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e71f7eb-5b8c-4382-813c-d0d21d627740/sv-benchmarks/c/verifythis/prefixsum_rec.c[525,538] [2021-11-23 13:38:02,298 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 13:38:02,310 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 13:38:02,322 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e71f7eb-5b8c-4382-813c-d0d21d627740/sv-benchmarks/c/verifythis/prefixsum_rec.c[525,538] [2021-11-23 13:38:02,337 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 13:38:02,350 INFO L208 MainTranslator]: Completed translation [2021-11-23 13:38:02,351 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:38:02 WrapperNode [2021-11-23 13:38:02,351 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 13:38:02,352 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 13:38:02,353 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 13:38:02,353 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 13:38:02,360 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:38:02" (1/1) ... [2021-11-23 13:38:02,370 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:38:02" (1/1) ... [2021-11-23 13:38:02,396 INFO L137 Inliner]: procedures = 22, calls = 37, calls flagged for inlining = 9, calls inlined = 9, statements flattened = 83 [2021-11-23 13:38:02,401 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 13:38:02,402 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 13:38:02,402 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 13:38:02,402 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 13:38:02,411 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:38:02" (1/1) ... [2021-11-23 13:38:02,412 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:38:02" (1/1) ... [2021-11-23 13:38:02,419 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:38:02" (1/1) ... [2021-11-23 13:38:02,420 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:38:02" (1/1) ... [2021-11-23 13:38:02,440 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:38:02" (1/1) ... [2021-11-23 13:38:02,454 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:38:02" (1/1) ... [2021-11-23 13:38:02,457 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:38:02" (1/1) ... [2021-11-23 13:38:02,464 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 13:38:02,465 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 13:38:02,473 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 13:38:02,473 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 13:38:02,474 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:38:02" (1/1) ... [2021-11-23 13:38:02,482 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 13:38:02,493 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e71f7eb-5b8c-4382-813c-d0d21d627740/bin/uautomizer-wIGwrQj20G/z3 [2021-11-23 13:38:02,509 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e71f7eb-5b8c-4382-813c-d0d21d627740/bin/uautomizer-wIGwrQj20G/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 13:38:02,547 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e71f7eb-5b8c-4382-813c-d0d21d627740/bin/uautomizer-wIGwrQj20G/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 13:38:02,568 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 13:38:02,569 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 13:38:02,569 INFO L130 BoogieDeclarations]: Found specification of procedure downsweep [2021-11-23 13:38:02,569 INFO L138 BoogieDeclarations]: Found implementation of procedure downsweep [2021-11-23 13:38:02,569 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-23 13:38:02,570 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-11-23 13:38:02,570 INFO L130 BoogieDeclarations]: Found specification of procedure upsweep [2021-11-23 13:38:02,570 INFO L138 BoogieDeclarations]: Found implementation of procedure upsweep [2021-11-23 13:38:02,571 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 13:38:02,572 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 13:38:02,573 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-23 13:38:02,573 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-23 13:38:02,705 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 13:38:02,707 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 13:38:05,169 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 13:38:05,176 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 13:38:05,177 INFO L301 CfgBuilder]: Removed 3 assume(true) statements. [2021-11-23 13:38:05,179 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 01:38:05 BoogieIcfgContainer [2021-11-23 13:38:05,179 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 13:38:05,181 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 13:38:05,181 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 13:38:05,189 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 13:38:05,189 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 01:38:02" (1/3) ... [2021-11-23 13:38:05,190 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@781b5d72 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 01:38:05, skipping insertion in model container [2021-11-23 13:38:05,190 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:38:02" (2/3) ... [2021-11-23 13:38:05,190 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@781b5d72 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 01:38:05, skipping insertion in model container [2021-11-23 13:38:05,190 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 01:38:05" (3/3) ... [2021-11-23 13:38:05,192 INFO L111 eAbstractionObserver]: Analyzing ICFG prefixsum_rec.c [2021-11-23 13:38:05,198 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 13:38:05,198 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-23 13:38:05,257 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 13:38:05,267 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 [2021-11-23 13:38:05,267 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-23 13:38:05,300 INFO L276 IsEmpty]: Start isEmpty. Operand has 40 states, 30 states have (on average 1.4) internal successors, (42), 33 states have internal predecessors, (42), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-23 13:38:05,307 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-23 13:38:05,308 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 13:38:05,308 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 13:38:05,309 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 13:38:05,316 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 13:38:05,316 INFO L85 PathProgramCache]: Analyzing trace with hash -1112089738, now seen corresponding path program 1 times [2021-11-23 13:38:05,327 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-23 13:38:05,328 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [964681005] [2021-11-23 13:38:05,328 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 13:38:05,329 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 13:38:05,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 13:38:05,544 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-23 13:38:05,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 13:38:05,590 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2021-11-23 13:38:05,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 13:38:05,618 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 13:38:05,618 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-23 13:38:05,619 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [964681005] [2021-11-23 13:38:05,620 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [964681005] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 13:38:05,620 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 13:38:05,620 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 13:38:05,623 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1856018278] [2021-11-23 13:38:05,625 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 13:38:05,629 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 13:38:05,629 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-23 13:38:05,665 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 13:38:05,665 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 13:38:05,667 INFO L87 Difference]: Start difference. First operand has 40 states, 30 states have (on average 1.4) internal successors, (42), 33 states have internal predecessors, (42), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) 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, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-23 13:38:05,783 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 13:38:05,784 INFO L93 Difference]: Finished difference Result 78 states and 105 transitions. [2021-11-23 13:38:05,785 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 13:38:05,786 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, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 28 [2021-11-23 13:38:05,786 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 13:38:05,794 INFO L225 Difference]: With dead ends: 78 [2021-11-23 13:38:05,794 INFO L226 Difference]: Without dead ends: 37 [2021-11-23 13:38:05,798 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 13:38:05,803 INFO L933 BasicCegarLoop]: 46 mSDtfsCounter, 3 mSDsluCounter, 29 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 75 SdHoareTripleChecker+Invalid, 18 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 13:38:05,806 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 75 Invalid, 18 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 13:38:05,828 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-11-23 13:38:05,859 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 36. [2021-11-23 13:38:05,861 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 27 states have (on average 1.1851851851851851) internal successors, (32), 29 states have internal predecessors, (32), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-23 13:38:05,867 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 44 transitions. [2021-11-23 13:38:05,868 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 44 transitions. Word has length 28 [2021-11-23 13:38:05,869 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 13:38:05,869 INFO L470 AbstractCegarLoop]: Abstraction has 36 states and 44 transitions. [2021-11-23 13:38:05,869 INFO L471 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, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-23 13:38:05,870 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 44 transitions. [2021-11-23 13:38:05,872 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-23 13:38:05,872 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 13:38:05,873 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 13:38:05,873 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-23 13:38:05,874 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 13:38:05,874 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 13:38:05,874 INFO L85 PathProgramCache]: Analyzing trace with hash -627348298, now seen corresponding path program 1 times [2021-11-23 13:38:05,875 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-23 13:38:05,875 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [691000999] [2021-11-23 13:38:05,875 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 13:38:05,876 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 13:38:05,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 13:38:06,186 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-23 13:38:06,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 13:38:06,221 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2021-11-23 13:38:06,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 13:38:06,241 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 13:38:06,241 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-23 13:38:06,242 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [691000999] [2021-11-23 13:38:06,244 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [691000999] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 13:38:06,246 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 13:38:06,246 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-23 13:38:06,246 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [930661471] [2021-11-23 13:38:06,246 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 13:38:06,248 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 13:38:06,249 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-23 13:38:06,249 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 13:38:06,250 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-23 13:38:06,251 INFO L87 Difference]: Start difference. First operand 36 states and 44 transitions. Second operand has 7 states, 7 states have (on average 3.4285714285714284) internal successors, (24), 6 states have internal predecessors, (24), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-23 13:38:08,282 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 13:38:08,746 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 13:38:08,746 INFO L93 Difference]: Finished difference Result 76 states and 94 transitions. [2021-11-23 13:38:08,747 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-23 13:38:08,748 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.4285714285714284) internal successors, (24), 6 states have internal predecessors, (24), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 28 [2021-11-23 13:38:08,748 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 13:38:08,750 INFO L225 Difference]: With dead ends: 76 [2021-11-23 13:38:08,750 INFO L226 Difference]: Without dead ends: 60 [2021-11-23 13:38:08,751 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=42, Invalid=90, Unknown=0, NotChecked=0, Total=132 [2021-11-23 13:38:08,752 INFO L933 BasicCegarLoop]: 44 mSDtfsCounter, 34 mSDsluCounter, 173 mSDsCounter, 0 mSdLazyCounter, 91 mSolverCounterSat, 14 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 217 SdHoareTripleChecker+Invalid, 106 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 91 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-11-23 13:38:08,753 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [36 Valid, 217 Invalid, 106 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 91 Invalid, 1 Unknown, 0 Unchecked, 2.4s Time] [2021-11-23 13:38:08,754 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-11-23 13:38:08,768 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 37. [2021-11-23 13:38:08,768 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 28 states have (on average 1.1785714285714286) internal successors, (33), 30 states have internal predecessors, (33), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-23 13:38:08,770 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 45 transitions. [2021-11-23 13:38:08,771 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 45 transitions. Word has length 28 [2021-11-23 13:38:08,771 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 13:38:08,778 INFO L470 AbstractCegarLoop]: Abstraction has 37 states and 45 transitions. [2021-11-23 13:38:08,779 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.4285714285714284) internal successors, (24), 6 states have internal predecessors, (24), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-23 13:38:08,779 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 45 transitions. [2021-11-23 13:38:08,782 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-23 13:38:08,782 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 13:38:08,782 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 13:38:08,782 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-23 13:38:08,783 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 13:38:08,785 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 13:38:08,785 INFO L85 PathProgramCache]: Analyzing trace with hash -250977996, now seen corresponding path program 1 times [2021-11-23 13:38:08,786 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-23 13:38:08,786 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1236863992] [2021-11-23 13:38:08,787 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 13:38:08,787 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 13:38:08,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 13:38:09,042 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 14 [2021-11-23 13:38:09,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 13:38:09,057 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2021-11-23 13:38:09,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 13:38:09,071 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 13:38:09,071 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-23 13:38:09,073 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1236863992] [2021-11-23 13:38:09,074 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1236863992] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 13:38:09,074 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1591984845] [2021-11-23 13:38:09,074 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 13:38:09,074 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 13:38:09,074 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e71f7eb-5b8c-4382-813c-d0d21d627740/bin/uautomizer-wIGwrQj20G/z3 [2021-11-23 13:38:09,084 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e71f7eb-5b8c-4382-813c-d0d21d627740/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 13:38:09,106 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e71f7eb-5b8c-4382-813c-d0d21d627740/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-23 13:38:09,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 13:38:09,170 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 13:38:09,177 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 13:38:09,583 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 13:38:09,583 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 13:38:09,797 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 13:38:09,798 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1591984845] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 13:38:09,798 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 13:38:09,798 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 6] total 14 [2021-11-23 13:38:09,798 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [148940189] [2021-11-23 13:38:09,799 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 13:38:09,799 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-23 13:38:09,800 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-23 13:38:09,800 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-23 13:38:09,800 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2021-11-23 13:38:09,801 INFO L87 Difference]: Start difference. First operand 37 states and 45 transitions. Second operand has 14 states, 14 states have (on average 3.857142857142857) internal successors, (54), 13 states have internal predecessors, (54), 1 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2021-11-23 13:38:09,974 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 13:38:09,974 INFO L93 Difference]: Finished difference Result 64 states and 79 transitions. [2021-11-23 13:38:09,974 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-23 13:38:09,975 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.857142857142857) internal successors, (54), 13 states have internal predecessors, (54), 1 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) Word has length 30 [2021-11-23 13:38:09,975 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 13:38:09,976 INFO L225 Difference]: With dead ends: 64 [2021-11-23 13:38:09,976 INFO L226 Difference]: Without dead ends: 41 [2021-11-23 13:38:09,977 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 55 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 51 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=68, Invalid=142, Unknown=0, NotChecked=0, Total=210 [2021-11-23 13:38:09,978 INFO L933 BasicCegarLoop]: 33 mSDtfsCounter, 43 mSDsluCounter, 103 mSDsCounter, 0 mSdLazyCounter, 71 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 136 SdHoareTripleChecker+Invalid, 92 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 71 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 13:38:09,978 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [45 Valid, 136 Invalid, 92 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 71 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 13:38:09,980 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2021-11-23 13:38:09,984 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 39. [2021-11-23 13:38:09,985 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 30 states have (on average 1.1666666666666667) internal successors, (35), 32 states have internal predecessors, (35), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-23 13:38:09,986 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 47 transitions. [2021-11-23 13:38:09,986 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 47 transitions. Word has length 30 [2021-11-23 13:38:09,987 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 13:38:09,987 INFO L470 AbstractCegarLoop]: Abstraction has 39 states and 47 transitions. [2021-11-23 13:38:09,987 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 3.857142857142857) internal successors, (54), 13 states have internal predecessors, (54), 1 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2021-11-23 13:38:09,987 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 47 transitions. [2021-11-23 13:38:09,988 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-11-23 13:38:09,989 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 13:38:09,989 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 13:38:10,028 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e71f7eb-5b8c-4382-813c-d0d21d627740/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-23 13:38:10,210 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e71f7eb-5b8c-4382-813c-d0d21d627740/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 13:38:10,211 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 13:38:10,211 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 13:38:10,211 INFO L85 PathProgramCache]: Analyzing trace with hash 663629362, now seen corresponding path program 2 times [2021-11-23 13:38:10,211 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-23 13:38:10,212 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1831724201] [2021-11-23 13:38:10,212 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 13:38:10,212 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 13:38:10,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 13:38:11,208 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-11-23 13:38:11,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 13:38:11,418 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2021-11-23 13:38:11,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 13:38:13,566 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 13:38:13,566 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-23 13:38:13,566 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1831724201] [2021-11-23 13:38:13,566 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1831724201] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 13:38:13,567 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [439709814] [2021-11-23 13:38:13,567 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 13:38:13,567 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 13:38:13,568 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e71f7eb-5b8c-4382-813c-d0d21d627740/bin/uautomizer-wIGwrQj20G/z3 [2021-11-23 13:38:13,569 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e71f7eb-5b8c-4382-813c-d0d21d627740/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 13:38:13,579 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e71f7eb-5b8c-4382-813c-d0d21d627740/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-23 13:38:13,664 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2021-11-23 13:38:13,665 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 13:38:13,684 INFO L263 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 60 conjunts are in the unsatisfiable core [2021-11-23 13:38:13,688 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 13:38:14,231 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-23 13:38:14,491 INFO L354 Elim1Store]: treesize reduction 66, result has 17.5 percent of original size [2021-11-23 13:38:14,491 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 70 treesize of output 32 [2021-11-23 13:38:14,775 INFO L354 Elim1Store]: treesize reduction 16, result has 15.8 percent of original size [2021-11-23 13:38:14,775 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 64 treesize of output 44 [2021-11-23 13:38:14,839 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 13:38:14,839 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 13:38:14,840 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [439709814] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 13:38:14,840 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 13:38:14,840 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [17] total 27 [2021-11-23 13:38:14,840 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2065635237] [2021-11-23 13:38:14,840 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 13:38:14,841 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-23 13:38:14,841 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-23 13:38:14,842 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-23 13:38:14,842 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=632, Unknown=0, NotChecked=0, Total=702 [2021-11-23 13:38:14,842 INFO L87 Difference]: Start difference. First operand 39 states and 47 transitions. Second operand has 13 states, 12 states have (on average 2.1666666666666665) internal successors, (26), 10 states have internal predecessors, (26), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-23 13:38:15,632 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 13:38:15,632 INFO L93 Difference]: Finished difference Result 67 states and 81 transitions. [2021-11-23 13:38:15,634 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 13:38:15,634 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 2.1666666666666665) internal successors, (26), 10 states have internal predecessors, (26), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 32 [2021-11-23 13:38:15,635 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 13:38:15,637 INFO L225 Difference]: With dead ends: 67 [2021-11-23 13:38:15,638 INFO L226 Difference]: Without dead ends: 65 [2021-11-23 13:38:15,638 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 171 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=118, Invalid=1004, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 13:38:15,640 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 63 mSDsluCounter, 151 mSDsCounter, 0 mSdLazyCounter, 244 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 174 SdHoareTripleChecker+Invalid, 262 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 244 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 13:38:15,640 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [69 Valid, 174 Invalid, 262 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 244 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 13:38:15,641 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2021-11-23 13:38:15,650 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 49. [2021-11-23 13:38:15,651 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 37 states have (on average 1.135135135135135) internal successors, (42), 38 states have internal predecessors, (42), 7 states have call successors, (7), 2 states have call predecessors, (7), 4 states have return successors, (14), 8 states have call predecessors, (14), 7 states have call successors, (14) [2021-11-23 13:38:15,652 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 63 transitions. [2021-11-23 13:38:15,652 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 63 transitions. Word has length 32 [2021-11-23 13:38:15,653 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 13:38:15,653 INFO L470 AbstractCegarLoop]: Abstraction has 49 states and 63 transitions. [2021-11-23 13:38:15,653 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 12 states have (on average 2.1666666666666665) internal successors, (26), 10 states have internal predecessors, (26), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-23 13:38:15,653 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 63 transitions. [2021-11-23 13:38:15,655 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-23 13:38:15,655 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 13:38:15,655 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 13:38:15,693 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e71f7eb-5b8c-4382-813c-d0d21d627740/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-23 13:38:15,875 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e71f7eb-5b8c-4382-813c-d0d21d627740/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 13:38:15,876 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 13:38:15,876 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 13:38:15,876 INFO L85 PathProgramCache]: Analyzing trace with hash 1120401257, now seen corresponding path program 1 times [2021-11-23 13:38:15,876 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-23 13:38:15,876 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1531314742] [2021-11-23 13:38:15,876 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 13:38:15,877 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 13:38:15,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 13:38:16,096 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-11-23 13:38:16,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 13:38:16,102 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2021-11-23 13:38:16,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 13:38:16,106 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 13:38:16,106 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-23 13:38:16,106 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1531314742] [2021-11-23 13:38:16,107 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1531314742] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 13:38:16,107 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [563090947] [2021-11-23 13:38:16,107 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 13:38:16,107 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 13:38:16,107 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e71f7eb-5b8c-4382-813c-d0d21d627740/bin/uautomizer-wIGwrQj20G/z3 [2021-11-23 13:38:16,110 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e71f7eb-5b8c-4382-813c-d0d21d627740/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 13:38:16,131 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e71f7eb-5b8c-4382-813c-d0d21d627740/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-23 13:38:16,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 13:38:16,194 INFO L263 TraceCheckSpWp]: Trace formula consists of 198 conjuncts, 83 conjunts are in the unsatisfiable core [2021-11-23 13:38:16,198 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 13:38:16,231 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 6 [2021-11-23 13:38:16,237 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-23 13:38:16,300 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-23 13:38:16,300 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2021-11-23 13:38:16,309 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 16 [2021-11-23 13:38:16,404 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 36 treesize of output 32 [2021-11-23 13:38:16,535 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 36 treesize of output 32 [2021-11-23 13:38:19,988 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 73 treesize of output 67 [2021-11-23 13:38:20,132 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 37 [2021-11-23 13:38:21,410 WARN L860 $PredicateComparison]: unable to prove that (exists ((downsweep_~tmp~0 Int)) (= |c_#memory_int| (store |c_old(#memory_int)| |c_downsweep_#in~a.base| (let ((.cse2 (+ |c_downsweep_#in~a.offset| (* |c_downsweep_#in~left| 4)))) (store (let ((.cse1 (+ (* |c_downsweep_#in~right| 4) |c_downsweep_#in~a.offset|)) (.cse0 (select |c_old(#memory_int)| |c_downsweep_#in~a.base|))) (store .cse0 .cse1 (+ (select .cse0 .cse1) (select .cse0 .cse2)))) .cse2 downsweep_~tmp~0))))) is different from true [2021-11-23 13:38:21,453 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 77 treesize of output 71 [2021-11-23 13:38:27,238 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-23 13:38:27,238 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 100 treesize of output 88 [2021-11-23 13:38:27,305 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 13:38:27,305 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 13:38:49,834 WARN L838 $PredicateComparison]: unable to prove that (let ((.cse0 (= (mod |c_ULTIMATE.start_main_~n~0#1| 2) 0))) (and (or (and (not .cse0) (< |c_ULTIMATE.start_main_~n~0#1| 0)) (forall ((|ULTIMATE.start_check_~a0#1.offset| Int) (v_downsweep_~tmp~0_7 Int)) (let ((.cse1 (let ((.cse4 (+ |c_ULTIMATE.start_main_~a~0#1.offset| (- 4) (* (div |c_ULTIMATE.start_main_~n~0#1| 2) 4)))) (store (let ((.cse2 (select |c_#memory_int| |c_ULTIMATE.start_main_~a~0#1.base|)) (.cse3 (+ |c_ULTIMATE.start_main_~a~0#1.offset| (- 4) (* |c_ULTIMATE.start_main_~n~0#1| 4)))) (store .cse2 .cse3 (+ (select .cse2 .cse4) (select .cse2 .cse3)))) .cse4 v_downsweep_~tmp~0_7)))) (= (select .cse1 (+ |c_ULTIMATE.start_main_~a~0#1.offset| 4)) (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~a~0#1.base| .cse1) |c_ULTIMATE.start_main_~a0~0#1.base|) |ULTIMATE.start_check_~a0#1.offset|))))) (or .cse0 (forall ((|ULTIMATE.start_check_~a0#1.offset| Int) (v_downsweep_~tmp~0_7 Int)) (let ((.cse5 (let ((.cse8 (+ |c_ULTIMATE.start_main_~a~0#1.offset| (* (div |c_ULTIMATE.start_main_~n~0#1| 2) 4)))) (store (let ((.cse7 (+ |c_ULTIMATE.start_main_~a~0#1.offset| (- 4) (* |c_ULTIMATE.start_main_~n~0#1| 4))) (.cse6 (select |c_#memory_int| |c_ULTIMATE.start_main_~a~0#1.base|))) (store .cse6 .cse7 (+ (select .cse6 .cse7) (select .cse6 .cse8)))) .cse8 v_downsweep_~tmp~0_7)))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~a~0#1.base| .cse5) |c_ULTIMATE.start_main_~a0~0#1.base|) |ULTIMATE.start_check_~a0#1.offset|) (select .cse5 (+ |c_ULTIMATE.start_main_~a~0#1.offset| 4))))) (<= 0 |c_ULTIMATE.start_main_~n~0#1|)))) is different from false [2021-11-23 13:38:49,838 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [563090947] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 13:38:49,839 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-23 13:38:49,839 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 19] total 26 [2021-11-23 13:38:49,839 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1947688237] [2021-11-23 13:38:49,839 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-23 13:38:49,839 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-23 13:38:49,839 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-23 13:38:49,840 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-23 13:38:49,840 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=721, Unknown=12, NotChecked=110, Total=930 [2021-11-23 13:38:49,840 INFO L87 Difference]: Start difference. First operand 49 states and 63 transitions. Second operand has 26 states, 26 states have (on average 2.269230769230769) internal successors, (59), 24 states have internal predecessors, (59), 2 states have call successors, (4), 1 states have call predecessors, (4), 3 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-23 13:38:51,879 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 13:39:05,667 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 13:39:05,667 INFO L93 Difference]: Finished difference Result 110 states and 144 transitions. [2021-11-23 13:39:05,667 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-11-23 13:39:05,668 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.269230769230769) internal successors, (59), 24 states have internal predecessors, (59), 2 states have call successors, (4), 1 states have call predecessors, (4), 3 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) Word has length 36 [2021-11-23 13:39:05,668 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 13:39:05,669 INFO L225 Difference]: With dead ends: 110 [2021-11-23 13:39:05,670 INFO L226 Difference]: Without dead ends: 77 [2021-11-23 13:39:05,671 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 24 SyntacticMatches, 4 SemanticMatches, 41 ConstructedPredicates, 2 IntricatePredicates, 0 DeprecatedPredicates, 319 ImplicationChecksByTransitivity, 45.7s TimeCoverageRelationStatistics Valid=222, Invalid=1408, Unknown=18, NotChecked=158, Total=1806 [2021-11-23 13:39:05,672 INFO L933 BasicCegarLoop]: 30 mSDtfsCounter, 22 mSDsluCounter, 317 mSDsCounter, 0 mSdLazyCounter, 196 mSolverCounterSat, 35 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 347 SdHoareTripleChecker+Invalid, 510 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 196 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 278 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2021-11-23 13:39:05,673 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [22 Valid, 347 Invalid, 510 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 196 Invalid, 1 Unknown, 278 Unchecked, 2.5s Time] [2021-11-23 13:39:05,674 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2021-11-23 13:39:05,686 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 71. [2021-11-23 13:39:05,686 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 57 states have (on average 1.1228070175438596) internal successors, (64), 58 states have internal predecessors, (64), 9 states have call successors, (9), 2 states have call predecessors, (9), 4 states have return successors, (18), 10 states have call predecessors, (18), 9 states have call successors, (18) [2021-11-23 13:39:05,688 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 91 transitions. [2021-11-23 13:39:05,688 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 91 transitions. Word has length 36 [2021-11-23 13:39:05,688 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 13:39:05,688 INFO L470 AbstractCegarLoop]: Abstraction has 71 states and 91 transitions. [2021-11-23 13:39:05,689 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 2.269230769230769) internal successors, (59), 24 states have internal predecessors, (59), 2 states have call successors, (4), 1 states have call predecessors, (4), 3 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-23 13:39:05,689 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 91 transitions. [2021-11-23 13:39:05,691 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-11-23 13:39:05,691 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 13:39:05,691 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 13:39:05,737 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e71f7eb-5b8c-4382-813c-d0d21d627740/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-23 13:39:05,891 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e71f7eb-5b8c-4382-813c-d0d21d627740/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 13:39:05,892 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 13:39:05,892 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 13:39:05,892 INFO L85 PathProgramCache]: Analyzing trace with hash 1051823591, now seen corresponding path program 2 times [2021-11-23 13:39:05,892 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-23 13:39:05,892 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [594566767] [2021-11-23 13:39:05,893 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 13:39:05,893 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 13:39:05,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 13:39:05,980 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 18 [2021-11-23 13:39:05,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 13:39:06,054 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2021-11-23 13:39:06,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 13:39:06,060 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 13:39:06,060 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-23 13:39:06,060 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [594566767] [2021-11-23 13:39:06,060 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [594566767] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 13:39:06,060 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1283214368] [2021-11-23 13:39:06,061 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 13:39:06,061 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 13:39:06,061 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e71f7eb-5b8c-4382-813c-d0d21d627740/bin/uautomizer-wIGwrQj20G/z3 [2021-11-23 13:39:06,062 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e71f7eb-5b8c-4382-813c-d0d21d627740/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 13:39:06,085 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e71f7eb-5b8c-4382-813c-d0d21d627740/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-23 13:39:06,137 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2021-11-23 13:39:06,137 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 13:39:06,139 INFO L263 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-23 13:39:06,143 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 13:39:06,647 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 13:39:06,647 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 13:39:06,647 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1283214368] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 13:39:06,648 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 13:39:06,648 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [10] total 15 [2021-11-23 13:39:06,648 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2065301786] [2021-11-23 13:39:06,648 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 13:39:06,650 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-23 13:39:06,650 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-23 13:39:06,653 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-23 13:39:06,654 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=175, Unknown=0, NotChecked=0, Total=210 [2021-11-23 13:39:06,654 INFO L87 Difference]: Start difference. First operand 71 states and 91 transitions. Second operand has 8 states, 8 states have (on average 3.625) internal successors, (29), 8 states have internal predecessors, (29), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-23 13:39:07,041 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 13:39:07,042 INFO L93 Difference]: Finished difference Result 103 states and 133 transitions. [2021-11-23 13:39:07,045 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-23 13:39:07,045 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.625) internal successors, (29), 8 states have internal predecessors, (29), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 38 [2021-11-23 13:39:07,045 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 13:39:07,047 INFO L225 Difference]: With dead ends: 103 [2021-11-23 13:39:07,047 INFO L226 Difference]: Without dead ends: 83 [2021-11-23 13:39:07,048 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=66, Invalid=314, Unknown=0, NotChecked=0, Total=380 [2021-11-23 13:39:07,049 INFO L933 BasicCegarLoop]: 36 mSDtfsCounter, 59 mSDsluCounter, 142 mSDsCounter, 0 mSdLazyCounter, 127 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 66 SdHoareTripleChecker+Valid, 178 SdHoareTripleChecker+Invalid, 133 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 127 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 13:39:07,049 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [66 Valid, 178 Invalid, 133 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 127 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 13:39:07,050 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2021-11-23 13:39:07,067 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 74. [2021-11-23 13:39:07,068 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 59 states have (on average 1.1355932203389831) internal successors, (67), 61 states have internal predecessors, (67), 10 states have call successors, (10), 2 states have call predecessors, (10), 4 states have return successors, (19), 10 states have call predecessors, (19), 10 states have call successors, (19) [2021-11-23 13:39:07,069 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 96 transitions. [2021-11-23 13:39:07,069 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 96 transitions. Word has length 38 [2021-11-23 13:39:07,070 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 13:39:07,070 INFO L470 AbstractCegarLoop]: Abstraction has 74 states and 96 transitions. [2021-11-23 13:39:07,070 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 3.625) internal successors, (29), 8 states have internal predecessors, (29), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-23 13:39:07,071 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 96 transitions. [2021-11-23 13:39:07,072 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-11-23 13:39:07,073 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 13:39:07,073 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 13:39:07,096 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e71f7eb-5b8c-4382-813c-d0d21d627740/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-23 13:39:07,279 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e71f7eb-5b8c-4382-813c-d0d21d627740/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 13:39:07,280 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 13:39:07,280 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 13:39:07,280 INFO L85 PathProgramCache]: Analyzing trace with hash 451063962, now seen corresponding path program 1 times [2021-11-23 13:39:07,280 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-23 13:39:07,280 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [530968401] [2021-11-23 13:39:07,280 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 13:39:07,281 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 13:39:07,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 13:39:07,353 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2021-11-23 13:39:07,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 13:39:07,432 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 26 [2021-11-23 13:39:07,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 13:39:07,439 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 13:39:07,439 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-23 13:39:07,439 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [530968401] [2021-11-23 13:39:07,439 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [530968401] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 13:39:07,440 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1349693913] [2021-11-23 13:39:07,440 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 13:39:07,440 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 13:39:07,440 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e71f7eb-5b8c-4382-813c-d0d21d627740/bin/uautomizer-wIGwrQj20G/z3 [2021-11-23 13:39:07,444 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e71f7eb-5b8c-4382-813c-d0d21d627740/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 13:39:07,467 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e71f7eb-5b8c-4382-813c-d0d21d627740/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-23 13:39:07,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 13:39:07,522 INFO L263 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 13:39:07,524 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 13:39:07,677 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 13:39:07,677 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 13:39:07,983 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 13:39:07,984 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1349693913] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 13:39:07,984 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 13:39:07,984 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 8, 8] total 14 [2021-11-23 13:39:07,984 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1140513883] [2021-11-23 13:39:07,984 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 13:39:07,985 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-23 13:39:07,985 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-23 13:39:07,985 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-23 13:39:07,985 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=142, Unknown=0, NotChecked=0, Total=182 [2021-11-23 13:39:07,986 INFO L87 Difference]: Start difference. First operand 74 states and 96 transitions. Second operand has 14 states, 14 states have (on average 3.4285714285714284) internal successors, (48), 13 states have internal predecessors, (48), 2 states have call successors, (5), 3 states have call predecessors, (5), 4 states have return successors, (4), 1 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-23 13:39:08,256 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 13:39:08,257 INFO L93 Difference]: Finished difference Result 100 states and 127 transitions. [2021-11-23 13:39:08,259 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-23 13:39:08,260 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.4285714285714284) internal successors, (48), 13 states have internal predecessors, (48), 2 states have call successors, (5), 3 states have call predecessors, (5), 4 states have return successors, (4), 1 states have call predecessors, (4), 2 states have call successors, (4) Word has length 39 [2021-11-23 13:39:08,260 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 13:39:08,261 INFO L225 Difference]: With dead ends: 100 [2021-11-23 13:39:08,261 INFO L226 Difference]: Without dead ends: 80 [2021-11-23 13:39:08,262 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 74 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=62, Invalid=210, Unknown=0, NotChecked=0, Total=272 [2021-11-23 13:39:08,263 INFO L933 BasicCegarLoop]: 43 mSDtfsCounter, 45 mSDsluCounter, 167 mSDsCounter, 0 mSdLazyCounter, 137 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 210 SdHoareTripleChecker+Invalid, 163 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 137 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 13:39:08,263 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [50 Valid, 210 Invalid, 163 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 137 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 13:39:08,264 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2021-11-23 13:39:08,279 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 68. [2021-11-23 13:39:08,283 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 55 states have (on average 1.1272727272727272) internal successors, (62), 57 states have internal predecessors, (62), 8 states have call successors, (8), 2 states have call predecessors, (8), 4 states have return successors, (15), 8 states have call predecessors, (15), 8 states have call successors, (15) [2021-11-23 13:39:08,286 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 85 transitions. [2021-11-23 13:39:08,287 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 85 transitions. Word has length 39 [2021-11-23 13:39:08,288 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 13:39:08,288 INFO L470 AbstractCegarLoop]: Abstraction has 68 states and 85 transitions. [2021-11-23 13:39:08,288 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 3.4285714285714284) internal successors, (48), 13 states have internal predecessors, (48), 2 states have call successors, (5), 3 states have call predecessors, (5), 4 states have return successors, (4), 1 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-23 13:39:08,289 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 85 transitions. [2021-11-23 13:39:08,294 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-11-23 13:39:08,299 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 13:39:08,300 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 13:39:08,345 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e71f7eb-5b8c-4382-813c-d0d21d627740/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-23 13:39:08,519 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e71f7eb-5b8c-4382-813c-d0d21d627740/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-11-23 13:39:08,520 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 13:39:08,520 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 13:39:08,520 INFO L85 PathProgramCache]: Analyzing trace with hash -1049653485, now seen corresponding path program 2 times [2021-11-23 13:39:08,520 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-23 13:39:08,520 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [80418186] [2021-11-23 13:39:08,520 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 13:39:08,520 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 13:39:08,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 13:39:08,684 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-11-23 13:39:08,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 13:39:08,689 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 24 [2021-11-23 13:39:08,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 13:39:08,695 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 3 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 13:39:08,695 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-23 13:39:08,696 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [80418186] [2021-11-23 13:39:08,696 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [80418186] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 13:39:08,696 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1437512196] [2021-11-23 13:39:08,696 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 13:39:08,696 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 13:39:08,697 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e71f7eb-5b8c-4382-813c-d0d21d627740/bin/uautomizer-wIGwrQj20G/z3 [2021-11-23 13:39:08,697 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e71f7eb-5b8c-4382-813c-d0d21d627740/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 13:39:08,700 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e71f7eb-5b8c-4382-813c-d0d21d627740/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-23 13:39:08,778 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 13:39:08,779 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 13:39:08,780 INFO L263 TraceCheckSpWp]: Trace formula consists of 215 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 13:39:08,782 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 13:39:09,001 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 8 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 13:39:09,002 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 13:39:09,150 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 8 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 13:39:09,151 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1437512196] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 13:39:09,151 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 13:39:09,151 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 9, 9] total 16 [2021-11-23 13:39:09,151 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1101418404] [2021-11-23 13:39:09,151 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 13:39:09,152 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 13:39:09,152 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-23 13:39:09,152 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 13:39:09,152 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=191, Unknown=0, NotChecked=0, Total=240 [2021-11-23 13:39:09,153 INFO L87 Difference]: Start difference. First operand 68 states and 85 transitions. Second operand has 16 states, 16 states have (on average 3.6875) internal successors, (59), 15 states have internal predecessors, (59), 1 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-23 13:39:09,496 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 13:39:09,496 INFO L93 Difference]: Finished difference Result 104 states and 127 transitions. [2021-11-23 13:39:09,497 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-23 13:39:09,497 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 3.6875) internal successors, (59), 15 states have internal predecessors, (59), 1 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 41 [2021-11-23 13:39:09,497 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 13:39:09,499 INFO L225 Difference]: With dead ends: 104 [2021-11-23 13:39:09,499 INFO L226 Difference]: Without dead ends: 88 [2021-11-23 13:39:09,500 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 81 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=101, Invalid=405, Unknown=0, NotChecked=0, Total=506 [2021-11-23 13:39:09,501 INFO L933 BasicCegarLoop]: 44 mSDtfsCounter, 64 mSDsluCounter, 224 mSDsCounter, 0 mSdLazyCounter, 169 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 66 SdHoareTripleChecker+Valid, 268 SdHoareTripleChecker+Invalid, 194 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 169 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 13:39:09,501 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [66 Valid, 268 Invalid, 194 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 169 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 13:39:09,502 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2021-11-23 13:39:09,515 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 70. [2021-11-23 13:39:09,516 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 56 states have (on average 1.1428571428571428) internal successors, (64), 58 states have internal predecessors, (64), 9 states have call successors, (9), 2 states have call predecessors, (9), 4 states have return successors, (16), 9 states have call predecessors, (16), 9 states have call successors, (16) [2021-11-23 13:39:09,517 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 89 transitions. [2021-11-23 13:39:09,517 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 89 transitions. Word has length 41 [2021-11-23 13:39:09,517 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 13:39:09,518 INFO L470 AbstractCegarLoop]: Abstraction has 70 states and 89 transitions. [2021-11-23 13:39:09,518 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 3.6875) internal successors, (59), 15 states have internal predecessors, (59), 1 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-23 13:39:09,518 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 89 transitions. [2021-11-23 13:39:09,519 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-23 13:39:09,519 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 13:39:09,520 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 13:39:09,559 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e71f7eb-5b8c-4382-813c-d0d21d627740/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-23 13:39:09,739 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e71f7eb-5b8c-4382-813c-d0d21d627740/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2021-11-23 13:39:09,740 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 13:39:09,740 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 13:39:09,740 INFO L85 PathProgramCache]: Analyzing trace with hash 207235141, now seen corresponding path program 1 times [2021-11-23 13:39:09,740 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-23 13:39:09,740 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1691436484] [2021-11-23 13:39:09,740 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 13:39:09,740 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 13:39:09,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 13:39:09,808 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-11-23 13:39:09,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 13:39:09,874 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 24 [2021-11-23 13:39:09,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 13:39:09,920 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-11-23 13:39:09,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 13:39:09,926 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-11-23 13:39:09,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 13:39:09,938 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 13:39:09,939 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-23 13:39:09,939 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1691436484] [2021-11-23 13:39:09,939 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1691436484] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 13:39:09,939 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [34231448] [2021-11-23 13:39:09,939 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 13:39:09,940 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 13:39:09,940 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e71f7eb-5b8c-4382-813c-d0d21d627740/bin/uautomizer-wIGwrQj20G/z3 [2021-11-23 13:39:09,941 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e71f7eb-5b8c-4382-813c-d0d21d627740/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 13:39:09,944 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e71f7eb-5b8c-4382-813c-d0d21d627740/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-23 13:39:10,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 13:39:10,020 INFO L263 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 13:39:10,023 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 13:39:10,266 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 13:39:10,266 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 13:39:13,838 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 13:39:13,838 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [34231448] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 13:39:13,838 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 13:39:13,838 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7, 8] total 16 [2021-11-23 13:39:13,839 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1788298106] [2021-11-23 13:39:13,839 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 13:39:13,839 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 13:39:13,839 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-23 13:39:13,840 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 13:39:13,840 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=189, Unknown=2, NotChecked=0, Total=240 [2021-11-23 13:39:13,840 INFO L87 Difference]: Start difference. First operand 70 states and 89 transitions. Second operand has 16 states, 15 states have (on average 2.8666666666666667) internal successors, (43), 15 states have internal predecessors, (43), 4 states have call successors, (10), 2 states have call predecessors, (10), 5 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-23 13:39:14,237 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 13:39:14,237 INFO L93 Difference]: Finished difference Result 79 states and 98 transitions. [2021-11-23 13:39:14,237 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-23 13:39:14,238 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 2.8666666666666667) internal successors, (43), 15 states have internal predecessors, (43), 4 states have call successors, (10), 2 states have call predecessors, (10), 5 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 43 [2021-11-23 13:39:14,238 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 13:39:14,239 INFO L225 Difference]: With dead ends: 79 [2021-11-23 13:39:14,239 INFO L226 Difference]: Without dead ends: 68 [2021-11-23 13:39:14,240 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 84 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=73, Invalid=267, Unknown=2, NotChecked=0, Total=342 [2021-11-23 13:39:14,241 INFO L933 BasicCegarLoop]: 32 mSDtfsCounter, 11 mSDsluCounter, 271 mSDsCounter, 0 mSdLazyCounter, 197 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 303 SdHoareTripleChecker+Invalid, 230 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 197 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 25 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 13:39:14,241 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 303 Invalid, 230 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 197 Invalid, 0 Unknown, 25 Unchecked, 0.3s Time] [2021-11-23 13:39:14,242 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2021-11-23 13:39:14,251 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 66. [2021-11-23 13:39:14,251 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 54 states have (on average 1.1481481481481481) internal successors, (62), 56 states have internal predecessors, (62), 8 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (10), 8 states have call predecessors, (10), 8 states have call successors, (10) [2021-11-23 13:39:14,252 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 80 transitions. [2021-11-23 13:39:14,253 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 80 transitions. Word has length 43 [2021-11-23 13:39:14,253 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 13:39:14,253 INFO L470 AbstractCegarLoop]: Abstraction has 66 states and 80 transitions. [2021-11-23 13:39:14,253 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 15 states have (on average 2.8666666666666667) internal successors, (43), 15 states have internal predecessors, (43), 4 states have call successors, (10), 2 states have call predecessors, (10), 5 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-23 13:39:14,253 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 80 transitions. [2021-11-23 13:39:14,254 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-11-23 13:39:14,254 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 13:39:14,255 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 13:39:14,294 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e71f7eb-5b8c-4382-813c-d0d21d627740/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2021-11-23 13:39:14,479 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e71f7eb-5b8c-4382-813c-d0d21d627740/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 13:39:14,480 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 13:39:14,480 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 13:39:14,480 INFO L85 PathProgramCache]: Analyzing trace with hash -1786209993, now seen corresponding path program 1 times [2021-11-23 13:39:14,480 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-23 13:39:14,480 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1835481300] [2021-11-23 13:39:14,480 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 13:39:14,480 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 13:39:14,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 13:39:14,562 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-11-23 13:39:14,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 13:39:14,662 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-11-23 13:39:14,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 13:39:14,668 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2021-11-23 13:39:14,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 13:39:14,675 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 36 [2021-11-23 13:39:14,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 13:39:14,714 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-23 13:39:14,715 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-23 13:39:14,715 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1835481300] [2021-11-23 13:39:14,715 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1835481300] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 13:39:14,715 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1047176450] [2021-11-23 13:39:14,715 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 13:39:14,715 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 13:39:14,715 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e71f7eb-5b8c-4382-813c-d0d21d627740/bin/uautomizer-wIGwrQj20G/z3 [2021-11-23 13:39:14,720 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e71f7eb-5b8c-4382-813c-d0d21d627740/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 13:39:14,739 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e71f7eb-5b8c-4382-813c-d0d21d627740/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-23 13:39:14,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 13:39:14,799 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 13:39:14,801 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 13:39:15,050 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-23 13:39:15,051 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 13:39:18,197 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-23 13:39:18,197 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1047176450] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 13:39:18,198 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 13:39:18,198 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7, 8] total 16 [2021-11-23 13:39:18,198 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1385182683] [2021-11-23 13:39:18,198 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 13:39:18,198 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 13:39:18,199 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-23 13:39:18,199 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 13:39:18,199 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=190, Unknown=2, NotChecked=0, Total=240 [2021-11-23 13:39:18,200 INFO L87 Difference]: Start difference. First operand 66 states and 80 transitions. Second operand has 16 states, 15 states have (on average 2.933333333333333) internal successors, (44), 15 states have internal predecessors, (44), 5 states have call successors, (10), 2 states have call predecessors, (10), 5 states have return successors, (10), 5 states have call predecessors, (10), 5 states have call successors, (10) [2021-11-23 13:39:18,551 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 13:39:18,551 INFO L93 Difference]: Finished difference Result 82 states and 100 transitions. [2021-11-23 13:39:18,552 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-23 13:39:18,552 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 2.933333333333333) internal successors, (44), 15 states have internal predecessors, (44), 5 states have call successors, (10), 2 states have call predecessors, (10), 5 states have return successors, (10), 5 states have call predecessors, (10), 5 states have call successors, (10) Word has length 45 [2021-11-23 13:39:18,553 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 13:39:18,554 INFO L225 Difference]: With dead ends: 82 [2021-11-23 13:39:18,554 INFO L226 Difference]: Without dead ends: 68 [2021-11-23 13:39:18,554 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 87 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 47 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=72, Invalid=268, Unknown=2, NotChecked=0, Total=342 [2021-11-23 13:39:18,555 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 32 mSDsluCounter, 180 mSDsCounter, 0 mSdLazyCounter, 144 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 211 SdHoareTripleChecker+Invalid, 182 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 144 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 22 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 13:39:18,556 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [37 Valid, 211 Invalid, 182 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 144 Invalid, 0 Unknown, 22 Unchecked, 0.3s Time] [2021-11-23 13:39:18,556 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2021-11-23 13:39:18,572 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 68. [2021-11-23 13:39:18,573 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 55 states have (on average 1.1454545454545455) internal successors, (63), 57 states have internal predecessors, (63), 8 states have call successors, (8), 2 states have call predecessors, (8), 4 states have return successors, (12), 8 states have call predecessors, (12), 8 states have call successors, (12) [2021-11-23 13:39:18,575 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 83 transitions. [2021-11-23 13:39:18,575 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 83 transitions. Word has length 45 [2021-11-23 13:39:18,576 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 13:39:18,576 INFO L470 AbstractCegarLoop]: Abstraction has 68 states and 83 transitions. [2021-11-23 13:39:18,576 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 15 states have (on average 2.933333333333333) internal successors, (44), 15 states have internal predecessors, (44), 5 states have call successors, (10), 2 states have call predecessors, (10), 5 states have return successors, (10), 5 states have call predecessors, (10), 5 states have call successors, (10) [2021-11-23 13:39:18,576 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 83 transitions. [2021-11-23 13:39:18,579 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-23 13:39:18,579 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 13:39:18,579 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 13:39:18,617 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e71f7eb-5b8c-4382-813c-d0d21d627740/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-23 13:39:18,800 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e71f7eb-5b8c-4382-813c-d0d21d627740/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-23 13:39:18,800 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 13:39:18,800 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 13:39:18,800 INFO L85 PathProgramCache]: Analyzing trace with hash -156199390, now seen corresponding path program 1 times [2021-11-23 13:39:18,801 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-23 13:39:18,801 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [609791097] [2021-11-23 13:39:18,801 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 13:39:18,801 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 13:39:18,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 13:39:19,203 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 18 [2021-11-23 13:39:19,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 13:39:19,213 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-11-23 13:39:19,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 13:39:19,218 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2021-11-23 13:39:19,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 13:39:19,223 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2021-11-23 13:39:19,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 13:39:19,233 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-11-23 13:39:19,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 13:39:19,238 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-11-23 13:39:19,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 13:39:19,244 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2021-11-23 13:39:19,244 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-23 13:39:19,244 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [609791097] [2021-11-23 13:39:19,245 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [609791097] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 13:39:19,245 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [863824445] [2021-11-23 13:39:19,245 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 13:39:19,245 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 13:39:19,245 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e71f7eb-5b8c-4382-813c-d0d21d627740/bin/uautomizer-wIGwrQj20G/z3 [2021-11-23 13:39:19,247 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e71f7eb-5b8c-4382-813c-d0d21d627740/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 13:39:19,267 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e71f7eb-5b8c-4382-813c-d0d21d627740/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-23 13:39:19,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 13:39:19,361 WARN L261 TraceCheckSpWp]: Trace formula consists of 286 conjuncts, 146 conjunts are in the unsatisfiable core [2021-11-23 13:39:19,365 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 13:39:19,385 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 6 [2021-11-23 13:39:19,390 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-23 13:39:19,439 INFO L354 Elim1Store]: treesize reduction 16, result has 23.8 percent of original size [2021-11-23 13:39:19,439 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 14 treesize of output 16 [2021-11-23 13:39:19,459 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-23 13:39:19,459 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2021-11-23 13:39:19,569 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 36 treesize of output 32 [2021-11-23 13:39:19,666 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 36 treesize of output 32 [2021-11-23 13:39:19,775 INFO L354 Elim1Store]: treesize reduction 36, result has 12.2 percent of original size [2021-11-23 13:39:19,775 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 40 treesize of output 36 [2021-11-23 13:39:28,251 WARN L860 $PredicateComparison]: unable to prove that (exists ((upsweep_~left Int)) (= |c_#memory_int| (store |c_old(#memory_int)| |c_upsweep_#in~a.base| (let ((.cse0 (select |c_old(#memory_int)| |c_upsweep_#in~a.base|)) (.cse1 (+ (* |c_upsweep_#in~right| 4) |c_upsweep_#in~a.offset|))) (store .cse0 .cse1 (+ (select .cse0 (+ (* upsweep_~left 4) |c_upsweep_#in~a.offset|)) (select .cse0 .cse1))))))) is different from true [2021-11-23 13:39:48,613 INFO L354 Elim1Store]: treesize reduction 241, result has 2.0 percent of original size [2021-11-23 13:39:48,613 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 288 treesize of output 250 [2021-11-23 13:39:48,728 INFO L354 Elim1Store]: treesize reduction 31, result has 13.9 percent of original size [2021-11-23 13:39:48,728 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 44 treesize of output 40 [2021-11-23 13:39:58,648 WARN L860 $PredicateComparison]: unable to prove that (exists ((downsweep_~left Int) (downsweep_~right Int) (downsweep_~tmp~0 Int) (downsweep_~a.offset Int)) (and (<= |c_downsweep_#in~right| downsweep_~right) (= |c_#memory_int| (store |c_old(#memory_int)| |c_downsweep_#in~a.base| (let ((.cse2 (+ downsweep_~a.offset (* downsweep_~left 4)))) (store (let ((.cse0 (select |c_old(#memory_int)| |c_downsweep_#in~a.base|)) (.cse1 (+ downsweep_~a.offset (* downsweep_~right 4)))) (store .cse0 .cse1 (+ (select .cse0 .cse2) (select .cse0 .cse1)))) .cse2 downsweep_~tmp~0)))) (<= |c_downsweep_#in~left| downsweep_~left) (<= |c_downsweep_#in~a.offset| downsweep_~a.offset))) is different from true [2021-11-23 13:40:03,360 WARN L860 $PredicateComparison]: unable to prove that (exists ((v_downsweep_~a.offset_38 Int) (downsweep_~left Int) (downsweep_~tmp~0 Int) (v_downsweep_~left_38 Int) (v_downsweep_~right_38 Int) (v_downsweep_~tmp~0_34 Int)) (and (<= |c_downsweep_#in~right| v_downsweep_~right_38) (<= |c_downsweep_#in~left| (+ 1 v_downsweep_~left_38)) (let ((.cse2 (* |c_downsweep_#in~right| (- 1))) (.cse0 (+ |c_downsweep_#in~left| 1)) (.cse1 (< (+ |c_downsweep_#in~right| v_downsweep_~left_38) (+ |c_downsweep_#in~left| downsweep_~left 1)))) (or (and (< v_downsweep_~left_38 .cse0) .cse1 (< (+ (div (+ |c_downsweep_#in~left| .cse2 1) (- 2)) v_downsweep_~left_38) .cse0)) (and (< (+ (div (+ |c_downsweep_#in~left| .cse2) (- 2)) v_downsweep_~left_38) .cse0) .cse1))) (= |c_#memory_int| (store |c_old(#memory_int)| |c_downsweep_#in~a.base| (let ((.cse5 (+ v_downsweep_~a.offset_38 (* downsweep_~left 4)))) (store (let ((.cse3 (let ((.cse9 (+ (* v_downsweep_~left_38 4) |c_downsweep_#in~a.offset|))) (store (let ((.cse10 (select |c_old(#memory_int)| |c_downsweep_#in~a.base|)) (.cse11 (+ (* |c_downsweep_#in~right| 4) |c_downsweep_#in~a.offset|))) (let ((.cse8 (select .cse10 .cse11)) (.cse7 (+ |c_downsweep_#in~a.offset| (* |c_downsweep_#in~left| 4)))) (let ((.cse6 (store .cse10 .cse11 (+ .cse8 (select .cse10 .cse7))))) (store .cse6 .cse7 (+ .cse8 (select (store .cse6 .cse7 .cse8) .cse9)))))) .cse9 v_downsweep_~tmp~0_34))) (.cse4 (+ (* v_downsweep_~right_38 4) v_downsweep_~a.offset_38))) (store .cse3 .cse4 (+ (select .cse3 .cse5) (select .cse3 .cse4)))) .cse5 downsweep_~tmp~0)))) (<= |c_downsweep_#in~a.offset| v_downsweep_~a.offset_38))) is different from true [2021-11-23 13:40:04,568 INFO L354 Elim1Store]: treesize reduction 456, result has 1.1 percent of original size [2021-11-23 13:40:04,569 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 651 treesize of output 601