./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/divbin2_unwindbound50.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 63182f13 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/config/AutomizerReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/divbin2_unwindbound50.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y --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 5b0ae54926d75c04421ee4ea5930c958fb8ba0ccacc4d56435da8ae7b298172d --- Real Ultimate output --- This is Ultimate 0.2.1-dev-63182f1 [2021-11-13 18:50:36,607 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-13 18:50:36,610 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-13 18:50:36,648 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-13 18:50:36,649 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-13 18:50:36,650 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-13 18:50:36,653 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-13 18:50:36,655 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-13 18:50:36,658 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-13 18:50:36,660 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-13 18:50:36,661 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-13 18:50:36,663 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-13 18:50:36,664 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-13 18:50:36,665 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-13 18:50:36,670 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-13 18:50:36,672 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-13 18:50:36,679 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-13 18:50:36,684 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-13 18:50:36,687 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-13 18:50:36,696 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-13 18:50:36,703 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-13 18:50:36,705 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-13 18:50:36,707 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-13 18:50:36,716 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-13 18:50:36,720 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-13 18:50:36,721 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-13 18:50:36,721 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-13 18:50:36,727 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-13 18:50:36,728 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-13 18:50:36,729 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-13 18:50:36,729 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-13 18:50:36,731 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-13 18:50:36,736 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-13 18:50:36,737 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-13 18:50:36,738 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-13 18:50:36,740 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-13 18:50:36,741 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-13 18:50:36,742 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-13 18:50:36,743 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-13 18:50:36,744 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-13 18:50:36,745 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-13 18:50:36,746 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/config/svcomp-Reach-32bit-Automizer_Default.epf [2021-11-13 18:50:36,779 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-13 18:50:36,780 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-13 18:50:36,780 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-13 18:50:36,780 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-13 18:50:36,781 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-13 18:50:36,781 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-13 18:50:36,782 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-13 18:50:36,783 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-13 18:50:36,783 INFO L138 SettingsManager]: * Use SBE=true [2021-11-13 18:50:36,783 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-13 18:50:36,784 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-13 18:50:36,784 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-13 18:50:36,784 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-13 18:50:36,784 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-13 18:50:36,785 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-13 18:50:36,785 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-13 18:50:36,785 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-13 18:50:36,785 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-13 18:50:36,786 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-13 18:50:36,786 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-13 18:50:36,786 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-13 18:50:36,787 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-13 18:50:36,787 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-13 18:50:36,787 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-13 18:50:36,787 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-13 18:50:36,788 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-13 18:50:36,788 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-13 18:50:36,788 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-13 18:50:36,788 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-11-13 18:50:36,789 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-13 18:50:36,789 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-11-13 18:50:36,789 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-11-13 18:50:36,789 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-13 18:50:36,790 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-13 18:50:36,790 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_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 5b0ae54926d75c04421ee4ea5930c958fb8ba0ccacc4d56435da8ae7b298172d [2021-11-13 18:50:37,107 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-13 18:50:37,143 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-13 18:50:37,147 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-13 18:50:37,149 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-13 18:50:37,150 INFO L275 PluginConnector]: CDTParser initialized [2021-11-13 18:50:37,152 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/../../sv-benchmarks/c/nla-digbench-scaling/divbin2_unwindbound50.i [2021-11-13 18:50:37,242 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/data/ee04c24d2/2fc1e84b363e4863a5551f1788f60fe2/FLAG50e98bd8d [2021-11-13 18:50:37,760 INFO L306 CDTParser]: Found 1 translation units. [2021-11-13 18:50:37,761 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/sv-benchmarks/c/nla-digbench-scaling/divbin2_unwindbound50.i [2021-11-13 18:50:37,767 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/data/ee04c24d2/2fc1e84b363e4863a5551f1788f60fe2/FLAG50e98bd8d [2021-11-13 18:50:38,113 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/data/ee04c24d2/2fc1e84b363e4863a5551f1788f60fe2 [2021-11-13 18:50:38,117 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-13 18:50:38,118 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-13 18:50:38,121 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-13 18:50:38,122 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-13 18:50:38,137 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-13 18:50:38,138 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.11 06:50:38" (1/1) ... [2021-11-13 18:50:38,140 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@41870a8b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:50:38, skipping insertion in model container [2021-11-13 18:50:38,143 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.11 06:50:38" (1/1) ... [2021-11-13 18:50:38,150 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-13 18:50:38,176 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-13 18:50:38,350 WARN L228 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_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/sv-benchmarks/c/nla-digbench-scaling/divbin2_unwindbound50.i[951,964] [2021-11-13 18:50:38,380 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-13 18:50:38,396 INFO L203 MainTranslator]: Completed pre-run [2021-11-13 18:50:38,408 WARN L228 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_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/sv-benchmarks/c/nla-digbench-scaling/divbin2_unwindbound50.i[951,964] [2021-11-13 18:50:38,414 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-13 18:50:38,427 INFO L208 MainTranslator]: Completed translation [2021-11-13 18:50:38,428 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:50:38 WrapperNode [2021-11-13 18:50:38,428 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-13 18:50:38,429 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-13 18:50:38,429 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-13 18:50:38,429 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-13 18:50:38,437 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:50:38" (1/1) ... [2021-11-13 18:50:38,445 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:50:38" (1/1) ... [2021-11-13 18:50:38,466 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-13 18:50:38,467 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-13 18:50:38,467 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-13 18:50:38,468 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-13 18:50:38,477 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:50:38" (1/1) ... [2021-11-13 18:50:38,477 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:50:38" (1/1) ... [2021-11-13 18:50:38,478 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:50:38" (1/1) ... [2021-11-13 18:50:38,479 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:50:38" (1/1) ... [2021-11-13 18:50:38,483 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:50:38" (1/1) ... [2021-11-13 18:50:38,487 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:50:38" (1/1) ... [2021-11-13 18:50:38,488 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:50:38" (1/1) ... [2021-11-13 18:50:38,490 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-13 18:50:38,491 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-13 18:50:38,492 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-13 18:50:38,492 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-13 18:50:38,493 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:50:38" (1/1) ... [2021-11-13 18:50:38,506 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-13 18:50:38,520 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 18:50:38,532 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-13 18:50:38,561 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-13 18:50:38,598 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-13 18:50:38,599 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-13 18:50:38,599 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-13 18:50:38,599 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-13 18:50:38,599 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-11-13 18:50:38,599 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-11-13 18:50:38,839 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-13 18:50:38,839 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-11-13 18:50:38,841 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.11 06:50:38 BoogieIcfgContainer [2021-11-13 18:50:38,841 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-13 18:50:38,843 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-13 18:50:38,843 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-13 18:50:38,846 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-13 18:50:38,846 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 13.11 06:50:38" (1/3) ... [2021-11-13 18:50:38,847 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@49d15fda and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.11 06:50:38, skipping insertion in model container [2021-11-13 18:50:38,847 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:50:38" (2/3) ... [2021-11-13 18:50:38,848 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@49d15fda and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.11 06:50:38, skipping insertion in model container [2021-11-13 18:50:38,848 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.11 06:50:38" (3/3) ... [2021-11-13 18:50:38,850 INFO L111 eAbstractionObserver]: Analyzing ICFG divbin2_unwindbound50.i [2021-11-13 18:50:38,855 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-13 18:50:38,855 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-13 18:50:38,904 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-13 18:50:38,914 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 [2021-11-13 18:50:38,914 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-13 18:50:38,935 INFO L276 IsEmpty]: Start isEmpty. Operand has 21 states, 16 states have (on average 1.5625) internal successors, (25), 17 states have internal predecessors, (25), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-13 18:50:38,941 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-13 18:50:38,941 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:50:38,942 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:50:38,943 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:50:38,951 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:50:38,952 INFO L85 PathProgramCache]: Analyzing trace with hash 553144752, now seen corresponding path program 1 times [2021-11-13 18:50:38,961 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:50:38,962 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1255629141] [2021-11-13 18:50:38,962 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:50:38,963 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:50:39,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:50:39,107 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 18:50:39,107 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:50:39,108 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1255629141] [2021-11-13 18:50:39,109 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1255629141] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-13 18:50:39,109 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-13 18:50:39,109 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-13 18:50:39,111 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1471986685] [2021-11-13 18:50:39,112 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 18:50:39,117 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-13 18:50:39,117 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:50:39,150 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-13 18:50:39,150 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-13 18:50:39,153 INFO L87 Difference]: Start difference. First operand has 21 states, 16 states have (on average 1.5625) internal successors, (25), 17 states have internal predecessors, (25), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Second operand has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 18:50:39,175 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:50:39,175 INFO L93 Difference]: Finished difference Result 37 states and 52 transitions. [2021-11-13 18:50:39,176 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-13 18:50:39,178 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2021-11-13 18:50:39,178 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:50:39,188 INFO L225 Difference]: With dead ends: 37 [2021-11-13 18:50:39,189 INFO L226 Difference]: Without dead ends: 17 [2021-11-13 18:50:39,192 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-13 18:50:39,198 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 0 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.00ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 0 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.90ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 0 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.00ms IncrementalHoareTripleChecker+Time [2021-11-13 18:50:39,200 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 26 Invalid, 0 Unknown, 0 Unchecked, 0.90ms Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.00ms Time] [2021-11-13 18:50:39,222 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-11-13 18:50:39,243 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2021-11-13 18:50:39,245 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 14 states have internal predecessors, (19), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 18:50:39,246 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 22 transitions. [2021-11-13 18:50:39,248 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 22 transitions. Word has length 8 [2021-11-13 18:50:39,248 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:50:39,249 INFO L470 AbstractCegarLoop]: Abstraction has 17 states and 22 transitions. [2021-11-13 18:50:39,249 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 18:50:39,249 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 22 transitions. [2021-11-13 18:50:39,250 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-11-13 18:50:39,250 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:50:39,251 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:50:39,251 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-13 18:50:39,251 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:50:39,253 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:50:39,253 INFO L85 PathProgramCache]: Analyzing trace with hash -803059042, now seen corresponding path program 1 times [2021-11-13 18:50:39,253 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:50:39,254 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2112108291] [2021-11-13 18:50:39,254 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:50:39,254 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:50:39,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:50:39,404 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 18:50:39,404 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:50:39,405 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2112108291] [2021-11-13 18:50:39,405 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2112108291] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-13 18:50:39,405 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-13 18:50:39,406 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-13 18:50:39,406 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1643297096] [2021-11-13 18:50:39,406 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 18:50:39,408 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-13 18:50:39,409 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:50:39,410 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-13 18:50:39,410 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-13 18:50:39,411 INFO L87 Difference]: Start difference. First operand 17 states and 22 transitions. Second operand has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 18:50:39,464 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:50:39,464 INFO L93 Difference]: Finished difference Result 31 states and 40 transitions. [2021-11-13 18:50:39,465 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-13 18:50:39,465 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2021-11-13 18:50:39,465 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:50:39,466 INFO L225 Difference]: With dead ends: 31 [2021-11-13 18:50:39,466 INFO L226 Difference]: Without dead ends: 19 [2021-11-13 18:50:39,467 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-13 18:50:39,470 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 0 mSDsluCounter, 35 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 26.89ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 55 SdHoareTripleChecker+Invalid, 9 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.87ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 9 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 43.23ms IncrementalHoareTripleChecker+Time [2021-11-13 18:50:39,471 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 55 Invalid, 9 Unknown, 0 Unchecked, 1.87ms Time], IncrementalHoareTripleChecker [0 Valid, 9 Invalid, 0 Unknown, 0 Unchecked, 43.23ms Time] [2021-11-13 18:50:39,472 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2021-11-13 18:50:39,476 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2021-11-13 18:50:39,477 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 15 states have (on average 1.4) internal successors, (21), 16 states have internal predecessors, (21), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 18:50:39,478 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 24 transitions. [2021-11-13 18:50:39,478 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 24 transitions. Word has length 10 [2021-11-13 18:50:39,478 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:50:39,479 INFO L470 AbstractCegarLoop]: Abstraction has 19 states and 24 transitions. [2021-11-13 18:50:39,479 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 18:50:39,479 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 24 transitions. [2021-11-13 18:50:39,493 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-13 18:50:39,493 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:50:39,493 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:50:39,494 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-13 18:50:39,494 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:50:39,495 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:50:39,495 INFO L85 PathProgramCache]: Analyzing trace with hash 549278495, now seen corresponding path program 1 times [2021-11-13 18:50:39,496 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:50:39,496 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1182615417] [2021-11-13 18:50:39,496 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:50:39,497 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:50:39,522 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-13 18:50:39,523 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [148538966] [2021-11-13 18:50:39,523 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:50:39,523 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:50:39,523 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 18:50:39,525 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 18:50:39,550 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-13 18:50:39,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:50:39,597 INFO L263 TraceCheckSpWp]: Trace formula consists of 55 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-13 18:50:39,604 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:50:39,767 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 18:50:39,768 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-13 18:50:39,768 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:50:39,768 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1182615417] [2021-11-13 18:50:39,769 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 18:50:39,769 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [148538966] [2021-11-13 18:50:39,770 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [148538966] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-13 18:50:39,771 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-13 18:50:39,771 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-13 18:50:39,776 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [319697896] [2021-11-13 18:50:39,776 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 18:50:39,777 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-13 18:50:39,777 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:50:39,778 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-13 18:50:39,779 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-13 18:50:39,780 INFO L87 Difference]: Start difference. First operand 19 states and 24 transitions. Second operand has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 18:50:39,834 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:50:39,834 INFO L93 Difference]: Finished difference Result 30 states and 36 transitions. [2021-11-13 18:50:39,835 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-13 18:50:39,836 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2021-11-13 18:50:39,837 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:50:39,838 INFO L225 Difference]: With dead ends: 30 [2021-11-13 18:50:39,839 INFO L226 Difference]: Without dead ends: 23 [2021-11-13 18:50:39,840 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-13 18:50:39,844 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 2 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 24.31ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 6.19ms SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 30.86ms IncrementalHoareTripleChecker+Time [2021-11-13 18:50:39,846 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 56 Invalid, 13 Unknown, 0 Unchecked, 6.19ms Time], IncrementalHoareTripleChecker [1 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 30.86ms Time] [2021-11-13 18:50:39,849 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-11-13 18:50:39,859 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 22. [2021-11-13 18:50:39,860 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 18 states have (on average 1.3888888888888888) internal successors, (25), 19 states have internal predecessors, (25), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 18:50:39,864 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 28 transitions. [2021-11-13 18:50:39,864 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 28 transitions. Word has length 11 [2021-11-13 18:50:39,864 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:50:39,865 INFO L470 AbstractCegarLoop]: Abstraction has 22 states and 28 transitions. [2021-11-13 18:50:39,866 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 18:50:39,866 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 28 transitions. [2021-11-13 18:50:39,868 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-13 18:50:39,869 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:50:39,870 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:50:39,916 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-13 18:50:40,084 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:50:40,085 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:50:40,086 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:50:40,086 INFO L85 PathProgramCache]: Analyzing trace with hash 551065955, now seen corresponding path program 1 times [2021-11-13 18:50:40,089 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:50:40,089 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1845105288] [2021-11-13 18:50:40,089 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:50:40,089 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:50:40,111 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-13 18:50:40,112 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2031145493] [2021-11-13 18:50:40,112 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:50:40,112 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:50:40,112 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 18:50:40,114 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 18:50:40,119 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-13 18:50:40,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:50:40,206 INFO L263 TraceCheckSpWp]: Trace formula consists of 55 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-13 18:50:40,208 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:50:40,477 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 18:50:40,478 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-13 18:50:40,478 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:50:40,478 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1845105288] [2021-11-13 18:50:40,478 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 18:50:40,479 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2031145493] [2021-11-13 18:50:40,479 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2031145493] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-13 18:50:40,479 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-13 18:50:40,480 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-13 18:50:40,480 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1271387137] [2021-11-13 18:50:40,480 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 18:50:40,481 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-13 18:50:40,481 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:50:40,482 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-13 18:50:40,482 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-13 18:50:40,482 INFO L87 Difference]: Start difference. First operand 22 states and 28 transitions. Second operand has 6 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 5 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 18:50:40,591 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:50:40,592 INFO L93 Difference]: Finished difference Result 31 states and 38 transitions. [2021-11-13 18:50:40,592 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-13 18:50:40,593 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 5 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2021-11-13 18:50:40,593 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:50:40,595 INFO L225 Difference]: With dead ends: 31 [2021-11-13 18:50:40,595 INFO L226 Difference]: Without dead ends: 28 [2021-11-13 18:50:40,596 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-11-13 18:50:40,600 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 9 mSDsluCounter, 59 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 55.77ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 76 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 7.11ms SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 70.73ms IncrementalHoareTripleChecker+Time [2021-11-13 18:50:40,606 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 76 Invalid, 41 Unknown, 0 Unchecked, 7.11ms Time], IncrementalHoareTripleChecker [1 Valid, 40 Invalid, 0 Unknown, 0 Unchecked, 70.73ms Time] [2021-11-13 18:50:40,608 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-11-13 18:50:40,614 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2021-11-13 18:50:40,614 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 22 states have (on average 1.3181818181818181) internal successors, (29), 23 states have internal predecessors, (29), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-13 18:50:40,615 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 34 transitions. [2021-11-13 18:50:40,616 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 34 transitions. Word has length 11 [2021-11-13 18:50:40,616 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:50:40,616 INFO L470 AbstractCegarLoop]: Abstraction has 28 states and 34 transitions. [2021-11-13 18:50:40,617 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 5 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 18:50:40,617 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 34 transitions. [2021-11-13 18:50:40,618 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-13 18:50:40,618 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:50:40,618 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:50:40,649 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-13 18:50:40,835 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:50:40,836 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:50:40,836 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:50:40,836 INFO L85 PathProgramCache]: Analyzing trace with hash 1647533572, now seen corresponding path program 1 times [2021-11-13 18:50:40,837 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:50:40,837 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1627053344] [2021-11-13 18:50:40,837 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:50:40,837 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:50:40,852 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-13 18:50:40,853 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1438089791] [2021-11-13 18:50:40,853 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:50:40,853 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:50:40,853 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 18:50:40,870 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 18:50:40,886 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-13 18:50:40,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:50:40,926 INFO L263 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-13 18:50:40,927 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:50:40,997 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 18:50:40,997 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 18:50:41,081 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 18:50:41,082 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:50:41,083 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1627053344] [2021-11-13 18:50:41,084 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 18:50:41,084 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1438089791] [2021-11-13 18:50:41,090 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1438089791] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 18:50:41,090 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-13 18:50:41,092 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 7 [2021-11-13 18:50:41,093 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1902131662] [2021-11-13 18:50:41,093 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-13 18:50:41,093 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-13 18:50:41,094 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:50:41,094 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-13 18:50:41,094 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2021-11-13 18:50:41,095 INFO L87 Difference]: Start difference. First operand 28 states and 34 transitions. Second operand has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 18:50:41,207 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:50:41,208 INFO L93 Difference]: Finished difference Result 62 states and 80 transitions. [2021-11-13 18:50:41,208 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-13 18:50:41,208 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2021-11-13 18:50:41,209 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:50:41,211 INFO L225 Difference]: With dead ends: 62 [2021-11-13 18:50:41,211 INFO L226 Difference]: Without dead ends: 50 [2021-11-13 18:50:41,212 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2021-11-13 18:50:41,214 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 30 mSDsluCounter, 81 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 34.25ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 102 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 4.47ms SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 61.71ms IncrementalHoareTripleChecker+Time [2021-11-13 18:50:41,214 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [30 Valid, 102 Invalid, 36 Unknown, 0 Unchecked, 4.47ms Time], IncrementalHoareTripleChecker [7 Valid, 29 Invalid, 0 Unknown, 0 Unchecked, 61.71ms Time] [2021-11-13 18:50:41,215 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-11-13 18:50:41,225 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 36. [2021-11-13 18:50:41,226 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 30 states have (on average 1.3) internal successors, (39), 31 states have internal predecessors, (39), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-13 18:50:41,227 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 44 transitions. [2021-11-13 18:50:41,227 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 44 transitions. Word has length 13 [2021-11-13 18:50:41,227 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:50:41,227 INFO L470 AbstractCegarLoop]: Abstraction has 36 states and 44 transitions. [2021-11-13 18:50:41,227 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 18:50:41,228 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 44 transitions. [2021-11-13 18:50:41,230 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-13 18:50:41,230 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:50:41,231 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:50:41,269 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-13 18:50:41,454 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:50:41,454 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:50:41,455 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:50:41,455 INFO L85 PathProgramCache]: Analyzing trace with hash -791761799, now seen corresponding path program 1 times [2021-11-13 18:50:41,455 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:50:41,456 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1657396847] [2021-11-13 18:50:41,456 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:50:41,456 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:50:41,487 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-13 18:50:41,487 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [108671651] [2021-11-13 18:50:41,488 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:50:41,488 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:50:41,488 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 18:50:41,495 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 18:50:41,497 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-13 18:50:41,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:50:41,538 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-13 18:50:41,540 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:50:41,609 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 18:50:41,610 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 18:50:41,692 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 18:50:41,692 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:50:41,693 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1657396847] [2021-11-13 18:50:41,693 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 18:50:41,693 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [108671651] [2021-11-13 18:50:41,693 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [108671651] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 18:50:41,693 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-13 18:50:41,694 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 9 [2021-11-13 18:50:41,694 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1163358878] [2021-11-13 18:50:41,694 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-13 18:50:41,694 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-13 18:50:41,695 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:50:41,695 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-13 18:50:41,695 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2021-11-13 18:50:41,696 INFO L87 Difference]: Start difference. First operand 36 states and 44 transitions. Second operand has 10 states, 10 states have (on average 2.3) internal successors, (23), 9 states have internal predecessors, (23), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 18:50:41,815 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:50:41,815 INFO L93 Difference]: Finished difference Result 87 states and 108 transitions. [2021-11-13 18:50:41,816 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-13 18:50:41,816 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.3) internal successors, (23), 9 states have internal predecessors, (23), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2021-11-13 18:50:41,816 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:50:41,820 INFO L225 Difference]: With dead ends: 87 [2021-11-13 18:50:41,820 INFO L226 Difference]: Without dead ends: 80 [2021-11-13 18:50:41,821 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=63, Invalid=119, Unknown=0, NotChecked=0, Total=182 [2021-11-13 18:50:41,825 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 69 mSDsluCounter, 123 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 50.75ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 146 SdHoareTripleChecker+Invalid, 65 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 4.66ms SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 61.02ms IncrementalHoareTripleChecker+Time [2021-11-13 18:50:41,826 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [69 Valid, 146 Invalid, 65 Unknown, 0 Unchecked, 4.66ms Time], IncrementalHoareTripleChecker [18 Valid, 47 Invalid, 0 Unknown, 0 Unchecked, 61.02ms Time] [2021-11-13 18:50:41,827 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2021-11-13 18:50:41,835 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 73. [2021-11-13 18:50:41,835 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 58 states have (on average 1.3793103448275863) internal successors, (80), 62 states have internal predecessors, (80), 9 states have call successors, (9), 5 states have call predecessors, (9), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-11-13 18:50:41,837 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 94 transitions. [2021-11-13 18:50:41,837 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 94 transitions. Word has length 14 [2021-11-13 18:50:41,837 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:50:41,837 INFO L470 AbstractCegarLoop]: Abstraction has 73 states and 94 transitions. [2021-11-13 18:50:41,838 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.3) internal successors, (23), 9 states have internal predecessors, (23), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 18:50:41,838 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 94 transitions. [2021-11-13 18:50:41,838 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-13 18:50:41,839 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:50:41,839 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:50:41,862 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-13 18:50:42,045 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:50:42,046 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:50:42,046 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:50:42,046 INFO L85 PathProgramCache]: Analyzing trace with hash -789974339, now seen corresponding path program 1 times [2021-11-13 18:50:42,047 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:50:42,047 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1976858912] [2021-11-13 18:50:42,047 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:50:42,047 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:50:42,059 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-13 18:50:42,059 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1337568737] [2021-11-13 18:50:42,059 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:50:42,059 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:50:42,060 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 18:50:42,060 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 18:50:42,074 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-13 18:50:42,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:50:42,136 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-13 18:50:42,137 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:50:42,304 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 18:50:42,305 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 18:50:42,481 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:50:42,481 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1976858912] [2021-11-13 18:50:42,481 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 18:50:42,481 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1337568737] [2021-11-13 18:50:42,481 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: Shadow problem: [|ULTIMATE.start_main_~b~0#1|] [2021-11-13 18:50:42,482 INFO L186 FreeRefinementEngine]: Found 0 perfect and 0 imperfect interpolant sequences. [2021-11-13 18:50:42,482 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [] total 0 [2021-11-13 18:50:42,482 ERROR L172 FreeRefinementEngine]: Strategy CAMEL failed to provide any proof altough trace is infeasible [2021-11-13 18:50:42,482 INFO L628 BasicCegarLoop]: Counterexample might be feasible [2021-11-13 18:50:42,489 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2021-11-13 18:50:42,519 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-13 18:50:42,695 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:50:42,701 INFO L732 BasicCegarLoop]: Path program histogram: [1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:50:42,703 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2021-11-13 18:50:42,714 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 13.11 06:50:42 BoogieIcfgContainer [2021-11-13 18:50:42,714 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-11-13 18:50:42,715 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-11-13 18:50:42,717 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-11-13 18:50:42,717 INFO L275 PluginConnector]: Witness Printer initialized [2021-11-13 18:50:42,718 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.11 06:50:38" (3/4) ... [2021-11-13 18:50:42,721 INFO L140 WitnessPrinter]: No result that supports witness generation found [2021-11-13 18:50:42,721 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-11-13 18:50:42,722 INFO L158 Benchmark]: Toolchain (without parser) took 4603.52ms. Allocated memory was 104.9MB in the beginning and 136.3MB in the end (delta: 31.5MB). Free memory was 66.1MB in the beginning and 63.5MB in the end (delta: 2.5MB). Peak memory consumption was 34.3MB. Max. memory is 16.1GB. [2021-11-13 18:50:42,722 INFO L158 Benchmark]: CDTParser took 0.34ms. Allocated memory is still 104.9MB. Free memory was 82.6MB in the beginning and 82.6MB in the end (delta: 47.7kB). There was no memory consumed. Max. memory is 16.1GB. [2021-11-13 18:50:42,723 INFO L158 Benchmark]: CACSL2BoogieTranslator took 307.57ms. Allocated memory is still 104.9MB. Free memory was 65.9MB in the beginning and 80.5MB in the end (delta: -14.6MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. [2021-11-13 18:50:42,723 INFO L158 Benchmark]: Boogie Procedure Inliner took 37.30ms. Allocated memory is still 104.9MB. Free memory was 80.5MB in the beginning and 78.9MB in the end (delta: 1.6MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-11-13 18:50:42,724 INFO L158 Benchmark]: Boogie Preprocessor took 23.36ms. Allocated memory is still 104.9MB. Free memory was 78.9MB in the beginning and 77.9MB in the end (delta: 1.0MB). There was no memory consumed. Max. memory is 16.1GB. [2021-11-13 18:50:42,724 INFO L158 Benchmark]: RCFGBuilder took 349.90ms. Allocated memory is still 104.9MB. Free memory was 77.9MB in the beginning and 68.0MB in the end (delta: 9.8MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. [2021-11-13 18:50:42,725 INFO L158 Benchmark]: TraceAbstraction took 3871.46ms. Allocated memory was 104.9MB in the beginning and 136.3MB in the end (delta: 31.5MB). Free memory was 67.8MB in the beginning and 63.5MB in the end (delta: 4.2MB). Peak memory consumption was 38.6MB. Max. memory is 16.1GB. [2021-11-13 18:50:42,725 INFO L158 Benchmark]: Witness Printer took 6.03ms. Allocated memory is still 136.3MB. Free memory is still 63.5MB. There was no memory consumed. Max. memory is 16.1GB. [2021-11-13 18:50:42,728 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.34ms. Allocated memory is still 104.9MB. Free memory was 82.6MB in the beginning and 82.6MB in the end (delta: 47.7kB). There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 307.57ms. Allocated memory is still 104.9MB. Free memory was 65.9MB in the beginning and 80.5MB in the end (delta: -14.6MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 37.30ms. Allocated memory is still 104.9MB. Free memory was 80.5MB in the beginning and 78.9MB in the end (delta: 1.6MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Boogie Preprocessor took 23.36ms. Allocated memory is still 104.9MB. Free memory was 78.9MB in the beginning and 77.9MB in the end (delta: 1.0MB). There was no memory consumed. Max. memory is 16.1GB. * RCFGBuilder took 349.90ms. Allocated memory is still 104.9MB. Free memory was 77.9MB in the beginning and 68.0MB in the end (delta: 9.8MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. * TraceAbstraction took 3871.46ms. Allocated memory was 104.9MB in the beginning and 136.3MB in the end (delta: 31.5MB). Free memory was 67.8MB in the beginning and 63.5MB in the end (delta: 4.2MB). Peak memory consumption was 38.6MB. Max. memory is 16.1GB. * Witness Printer took 6.03ms. Allocated memory is still 136.3MB. Free memory is still 63.5MB. There was no memory consumed. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0s ErrorAutomatonConstructionTimeTotal, 0.0s FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0s ErrorAutomatonConstructionTimeAvg, 0.0s ErrorAutomatonDifferenceTimeAvg, 0.0s ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - UnprovableResult [Line: 21]: Unable to prove that call to reach_error is unreachable Unable to prove that call to reach_error is unreachable Reason: unable to decide satisfiability of path constraint. Possible FailurePath: [L25] int counter = 0; [L27] unsigned A, B; [L28] unsigned q, r, b; [L29] A = __VERIFIER_nondet_uint() [L30] B = 1 [L31] q = 0 [L32] r = A [L33] b = B [L34] EXPR counter++ [L34] COND TRUE counter++<50 [L35] COND FALSE !(!(r >= b)) [L36] b = 2 * b [L34] EXPR counter++ [L34] COND TRUE counter++<50 [L35] COND TRUE !(r >= b) [L38] EXPR counter++ [L38] COND TRUE counter++<50 [L39] CALL __VERIFIER_assert(A == q * b + r) [L19] COND TRUE !(cond) [L21] reach_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 2 procedures, 21 locations, 1 error locations. Started 1 CEGAR loops. OverallTime: 3.8s, OverallIterations: 7, TraceHistogramMax: 2, PathProgramHistogramMax: 1, EmptinessCheckTime: 0.0s, AutomataDifference: 0.6s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, PartialOrderReductionTime: 0.0s, HoareTripleCheckerStatistics: 0 mSolverCounterUnknown, 111 SdHoareTripleChecker+Valid, 267.55ms IncrementalHoareTripleChecker+Time, 0 mSdLazyCounter, 110 mSDsluCounter, 461 SdHoareTripleChecker+Invalid, 191.97ms Time, 0 mProtectedAction, 0 SdHoareTripleChecker+Unchecked, 0 IncrementalHoareTripleChecker+Unchecked, 335 mSDsCounter, 27 IncrementalHoareTripleChecker+Valid, 0 mProtectedPredicate, 137 IncrementalHoareTripleChecker+Invalid, 164 SdHoareTripleChecker+Unknown, 0 mSolverCounterNotChecked, 27 mSolverCounterUnsat, 126 mSDtfsCounter, 137 mSolverCounterSat, 25.19ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Unknown, PredicateUnifierStatistics: 0 DeclaredPredicates, 83 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=73occurred in iteration=6, InterpolantAutomatonStates: 40, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 6 MinimizatonAttempts, 22 StatesRemovedByMinimization, 3 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 0.3s SatisfiabilityAnalysisTime, 1.3s InterpolantComputationTime, 81 NumberOfCodeBlocks, 81 NumberOfCodeBlocksAsserted, 7 NumberOfCheckSat, 99 ConstructedInterpolants, 0 QuantifiedInterpolants, 353 SizeOfPredicates, 8 NumberOfNonLiveVariables, 298 ConjunctsInSsa, 41 ConjunctsInUnsatCore, 9 InterpolantComputations, 4 PerfectInterpolantSequences, 0/13 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: unable to determine feasibility of some traces [2021-11-13 18:50:42,765 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request... --- End real Ultimate output --- Execution finished normally Using bit-precise analysis Retrying with bit-precise analysis ### Bit-precise run ### Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/config/AutomizerReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/divbin2_unwindbound50.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/config/svcomp-Reach-32bit-Automizer_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y --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 5b0ae54926d75c04421ee4ea5930c958fb8ba0ccacc4d56435da8ae7b298172d --- Real Ultimate output --- This is Ultimate 0.2.1-dev-63182f1 [2021-11-13 18:50:45,399 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-13 18:50:45,402 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-13 18:50:45,441 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-13 18:50:45,442 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-13 18:50:45,444 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-13 18:50:45,446 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-13 18:50:45,450 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-13 18:50:45,452 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-13 18:50:45,454 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-13 18:50:45,455 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-13 18:50:45,457 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-13 18:50:45,458 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-13 18:50:45,459 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-13 18:50:45,462 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-13 18:50:45,464 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-13 18:50:45,466 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-13 18:50:45,467 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-13 18:50:45,470 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-13 18:50:45,473 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-13 18:50:45,476 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-13 18:50:45,478 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-13 18:50:45,480 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-13 18:50:45,481 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-13 18:50:45,486 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-13 18:50:45,487 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-13 18:50:45,487 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-13 18:50:45,489 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-13 18:50:45,490 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-13 18:50:45,491 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-13 18:50:45,492 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-13 18:50:45,493 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-13 18:50:45,495 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-13 18:50:45,496 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-13 18:50:45,498 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-13 18:50:45,498 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-13 18:50:45,499 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-13 18:50:45,500 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-13 18:50:45,500 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-13 18:50:45,502 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-13 18:50:45,503 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-13 18:50:45,504 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/config/svcomp-Reach-32bit-Automizer_Bitvector.epf [2021-11-13 18:50:45,544 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-13 18:50:45,545 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-13 18:50:45,546 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-13 18:50:45,547 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-13 18:50:45,548 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-13 18:50:45,549 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-13 18:50:45,551 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-13 18:50:45,552 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-13 18:50:45,553 INFO L138 SettingsManager]: * Use SBE=true [2021-11-13 18:50:45,553 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-13 18:50:45,554 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-13 18:50:45,555 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-13 18:50:45,555 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-13 18:50:45,555 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-13 18:50:45,556 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-13 18:50:45,556 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-13 18:50:45,556 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-11-13 18:50:45,556 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-11-13 18:50:45,557 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-13 18:50:45,557 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-13 18:50:45,557 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-13 18:50:45,558 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-13 18:50:45,558 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-13 18:50:45,558 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-13 18:50:45,558 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-13 18:50:45,559 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-13 18:50:45,559 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-13 18:50:45,559 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-13 18:50:45,560 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-13 18:50:45,560 INFO L138 SettingsManager]: * Trace refinement strategy=WOLF [2021-11-13 18:50:45,560 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-11-13 18:50:45,560 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-11-13 18:50:45,561 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-11-13 18:50:45,561 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-13 18:50:45,562 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-13 18:50:45,562 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-13 18:50:45,562 INFO L138 SettingsManager]: * Logic for external solver=AUFBV WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 5b0ae54926d75c04421ee4ea5930c958fb8ba0ccacc4d56435da8ae7b298172d [2021-11-13 18:50:46,165 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-13 18:50:46,191 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-13 18:50:46,195 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-13 18:50:46,197 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-13 18:50:46,205 INFO L275 PluginConnector]: CDTParser initialized [2021-11-13 18:50:46,207 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/../../sv-benchmarks/c/nla-digbench-scaling/divbin2_unwindbound50.i [2021-11-13 18:50:46,300 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/data/fadf04b85/e6990ca475ff44ba95c765900f9579c6/FLAG4ac766798 [2021-11-13 18:50:47,032 INFO L306 CDTParser]: Found 1 translation units. [2021-11-13 18:50:47,035 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/sv-benchmarks/c/nla-digbench-scaling/divbin2_unwindbound50.i [2021-11-13 18:50:47,045 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/data/fadf04b85/e6990ca475ff44ba95c765900f9579c6/FLAG4ac766798 [2021-11-13 18:50:47,359 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/data/fadf04b85/e6990ca475ff44ba95c765900f9579c6 [2021-11-13 18:50:47,362 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-13 18:50:47,364 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-13 18:50:47,371 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-13 18:50:47,371 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-13 18:50:47,376 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-13 18:50:47,378 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.11 06:50:47" (1/1) ... [2021-11-13 18:50:47,380 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4cdb42bf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:50:47, skipping insertion in model container [2021-11-13 18:50:47,381 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.11 06:50:47" (1/1) ... [2021-11-13 18:50:47,393 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-13 18:50:47,416 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-13 18:50:47,635 WARN L228 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_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/sv-benchmarks/c/nla-digbench-scaling/divbin2_unwindbound50.i[951,964] [2021-11-13 18:50:47,674 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-13 18:50:47,693 INFO L203 MainTranslator]: Completed pre-run [2021-11-13 18:50:47,716 WARN L228 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_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/sv-benchmarks/c/nla-digbench-scaling/divbin2_unwindbound50.i[951,964] [2021-11-13 18:50:47,745 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-13 18:50:47,777 INFO L208 MainTranslator]: Completed translation [2021-11-13 18:50:47,778 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:50:47 WrapperNode [2021-11-13 18:50:47,778 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-13 18:50:47,780 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-13 18:50:47,780 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-13 18:50:47,781 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-13 18:50:47,790 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:50:47" (1/1) ... [2021-11-13 18:50:47,806 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:50:47" (1/1) ... [2021-11-13 18:50:47,835 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-13 18:50:47,837 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-13 18:50:47,837 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-13 18:50:47,838 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-13 18:50:47,849 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:50:47" (1/1) ... [2021-11-13 18:50:47,850 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:50:47" (1/1) ... [2021-11-13 18:50:47,868 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:50:47" (1/1) ... [2021-11-13 18:50:47,873 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:50:47" (1/1) ... [2021-11-13 18:50:47,880 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:50:47" (1/1) ... [2021-11-13 18:50:47,887 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:50:47" (1/1) ... [2021-11-13 18:50:47,900 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:50:47" (1/1) ... [2021-11-13 18:50:47,903 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-13 18:50:47,905 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-13 18:50:47,907 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-13 18:50:47,907 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-13 18:50:47,910 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:50:47" (1/1) ... [2021-11-13 18:50:47,920 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-13 18:50:47,938 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 18:50:47,953 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-13 18:50:47,982 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-13 18:50:48,031 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-11-13 18:50:48,032 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-13 18:50:48,032 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-13 18:50:48,032 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-13 18:50:48,032 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-11-13 18:50:48,032 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-11-13 18:50:48,320 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-13 18:50:48,320 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-11-13 18:50:48,323 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.11 06:50:48 BoogieIcfgContainer [2021-11-13 18:50:48,323 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-13 18:50:48,326 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-13 18:50:48,326 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-13 18:50:48,330 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-13 18:50:48,330 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 13.11 06:50:47" (1/3) ... [2021-11-13 18:50:48,331 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@21b24bed and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.11 06:50:48, skipping insertion in model container [2021-11-13 18:50:48,332 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:50:47" (2/3) ... [2021-11-13 18:50:48,332 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@21b24bed and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.11 06:50:48, skipping insertion in model container [2021-11-13 18:50:48,333 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.11 06:50:48" (3/3) ... [2021-11-13 18:50:48,334 INFO L111 eAbstractionObserver]: Analyzing ICFG divbin2_unwindbound50.i [2021-11-13 18:50:48,341 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-13 18:50:48,342 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-13 18:50:48,406 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-13 18:50:48,415 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 [2021-11-13 18:50:48,416 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-13 18:50:48,437 INFO L276 IsEmpty]: Start isEmpty. Operand has 21 states, 16 states have (on average 1.5625) internal successors, (25), 17 states have internal predecessors, (25), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-13 18:50:48,443 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-13 18:50:48,444 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:50:48,445 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:50:48,445 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:50:48,452 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:50:48,453 INFO L85 PathProgramCache]: Analyzing trace with hash 553144752, now seen corresponding path program 1 times [2021-11-13 18:50:48,484 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-11-13 18:50:48,485 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1915946250] [2021-11-13 18:50:48,485 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:50:48,486 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-13 18:50:48,487 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/mathsat [2021-11-13 18:50:48,506 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-13 18:50:48,513 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-11-13 18:50:48,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:50:48,651 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 1 conjunts are in the unsatisfiable core [2021-11-13 18:50:48,657 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:50:48,740 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 18:50:48,740 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 18:50:48,840 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 18:50:48,842 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-11-13 18:50:48,842 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1915946250] [2021-11-13 18:50:48,843 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1915946250] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-13 18:50:48,843 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-13 18:50:48,844 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [] total 2 [2021-11-13 18:50:48,846 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1424530877] [2021-11-13 18:50:48,847 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-13 18:50:48,852 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-13 18:50:48,859 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-11-13 18:50:48,903 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-13 18:50:48,905 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-13 18:50:48,909 INFO L87 Difference]: Start difference. First operand has 21 states, 16 states have (on average 1.5625) internal successors, (25), 17 states have internal predecessors, (25), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Second operand has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 18:50:48,942 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:50:48,943 INFO L93 Difference]: Finished difference Result 37 states and 52 transitions. [2021-11-13 18:50:48,944 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-13 18:50:48,946 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2021-11-13 18:50:48,947 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:50:48,960 INFO L225 Difference]: With dead ends: 37 [2021-11-13 18:50:48,961 INFO L226 Difference]: Without dead ends: 17 [2021-11-13 18:50:48,972 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-13 18:50:48,978 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 0 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.00ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 0 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.24ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 0 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.00ms IncrementalHoareTripleChecker+Time [2021-11-13 18:50:48,981 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 26 Invalid, 0 Unknown, 0 Unchecked, 3.24ms Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.00ms Time] [2021-11-13 18:50:49,005 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-11-13 18:50:49,047 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2021-11-13 18:50:49,049 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 14 states have internal predecessors, (19), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 18:50:49,051 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 22 transitions. [2021-11-13 18:50:49,053 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 22 transitions. Word has length 8 [2021-11-13 18:50:49,053 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:50:49,053 INFO L470 AbstractCegarLoop]: Abstraction has 17 states and 22 transitions. [2021-11-13 18:50:49,054 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 18:50:49,054 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 22 transitions. [2021-11-13 18:50:49,056 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-11-13 18:50:49,056 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:50:49,057 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:50:49,079 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-11-13 18:50:49,270 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/mathsat -unsat_core_generation=3 [2021-11-13 18:50:49,271 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:50:49,272 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:50:49,272 INFO L85 PathProgramCache]: Analyzing trace with hash -803059042, now seen corresponding path program 1 times [2021-11-13 18:50:49,276 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-11-13 18:50:49,277 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1884906436] [2021-11-13 18:50:49,278 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:50:49,278 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-13 18:50:49,279 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/mathsat [2021-11-13 18:50:49,280 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-13 18:50:49,308 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-11-13 18:50:49,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:50:49,373 INFO L263 TraceCheckSpWp]: Trace formula consists of 34 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-13 18:50:49,374 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:50:49,503 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 18:50:49,503 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 18:50:49,580 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 18:50:49,582 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-11-13 18:50:49,582 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1884906436] [2021-11-13 18:50:49,583 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1884906436] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-13 18:50:49,583 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-13 18:50:49,584 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 5 [2021-11-13 18:50:49,585 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1206810646] [2021-11-13 18:50:49,586 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-13 18:50:49,588 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-13 18:50:49,594 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-11-13 18:50:49,595 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-13 18:50:49,597 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-13 18:50:49,600 INFO L87 Difference]: Start difference. First operand 17 states and 22 transitions. Second operand has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 5 states have internal predecessors, (13), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 18:50:49,687 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:50:49,690 INFO L93 Difference]: Finished difference Result 35 states and 46 transitions. [2021-11-13 18:50:49,691 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-13 18:50:49,692 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 5 states have internal predecessors, (13), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2021-11-13 18:50:49,692 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:50:49,694 INFO L225 Difference]: With dead ends: 35 [2021-11-13 18:50:49,695 INFO L226 Difference]: Without dead ends: 23 [2021-11-13 18:50:49,697 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2021-11-13 18:50:49,701 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 2 mSDsluCounter, 68 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 39.17ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 87 SdHoareTripleChecker+Invalid, 21 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 4.93ms SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 49.10ms IncrementalHoareTripleChecker+Time [2021-11-13 18:50:49,702 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 87 Invalid, 21 Unknown, 0 Unchecked, 4.93ms Time], IncrementalHoareTripleChecker [2 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 49.10ms Time] [2021-11-13 18:50:49,707 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-11-13 18:50:49,714 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 22. [2021-11-13 18:50:49,717 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 18 states have (on average 1.3888888888888888) internal successors, (25), 19 states have internal predecessors, (25), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 18:50:49,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 28 transitions. [2021-11-13 18:50:49,720 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 28 transitions. Word has length 10 [2021-11-13 18:50:49,721 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:50:49,727 INFO L470 AbstractCegarLoop]: Abstraction has 22 states and 28 transitions. [2021-11-13 18:50:49,728 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 5 states have internal predecessors, (13), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 18:50:49,728 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 28 transitions. [2021-11-13 18:50:49,729 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-13 18:50:49,729 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:50:49,730 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:50:49,750 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-11-13 18:50:49,943 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/mathsat -unsat_core_generation=3 [2021-11-13 18:50:49,944 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:50:49,944 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:50:49,945 INFO L85 PathProgramCache]: Analyzing trace with hash 549278495, now seen corresponding path program 1 times [2021-11-13 18:50:49,945 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-11-13 18:50:49,945 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [598491225] [2021-11-13 18:50:49,946 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:50:49,946 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-13 18:50:49,946 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/mathsat [2021-11-13 18:50:49,950 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-13 18:50:49,952 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-11-13 18:50:50,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:50:50,011 INFO L263 TraceCheckSpWp]: Trace formula consists of 35 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-13 18:50:50,012 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:50:50,116 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 18:50:50,117 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 18:50:50,200 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 18:50:50,200 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-11-13 18:50:50,200 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [598491225] [2021-11-13 18:50:50,201 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [598491225] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-13 18:50:50,201 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-13 18:50:50,201 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 7 [2021-11-13 18:50:50,202 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1132212794] [2021-11-13 18:50:50,202 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-13 18:50:50,203 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-13 18:50:50,203 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-11-13 18:50:50,204 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-13 18:50:50,204 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2021-11-13 18:50:50,204 INFO L87 Difference]: Start difference. First operand 22 states and 28 transitions. Second operand has 8 states, 8 states have (on average 2.125) internal successors, (17), 7 states have internal predecessors, (17), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 18:50:50,607 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:50:50,607 INFO L93 Difference]: Finished difference Result 60 states and 75 transitions. [2021-11-13 18:50:50,610 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-13 18:50:50,611 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.125) internal successors, (17), 7 states have internal predecessors, (17), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2021-11-13 18:50:50,611 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:50:50,613 INFO L225 Difference]: With dead ends: 60 [2021-11-13 18:50:50,613 INFO L226 Difference]: Without dead ends: 53 [2021-11-13 18:50:50,614 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2021-11-13 18:50:50,616 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 40 mSDsluCounter, 81 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 248.98ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 102 SdHoareTripleChecker+Invalid, 51 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.93ms SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 319.18ms IncrementalHoareTripleChecker+Time [2021-11-13 18:50:50,617 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [40 Valid, 102 Invalid, 51 Unknown, 0 Unchecked, 3.93ms Time], IncrementalHoareTripleChecker [15 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 319.18ms Time] [2021-11-13 18:50:50,618 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2021-11-13 18:50:50,629 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 48. [2021-11-13 18:50:50,630 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 38 states have (on average 1.4210526315789473) internal successors, (54), 41 states have internal predecessors, (54), 6 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-13 18:50:50,633 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 63 transitions. [2021-11-13 18:50:50,633 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 63 transitions. Word has length 11 [2021-11-13 18:50:50,633 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:50:50,634 INFO L470 AbstractCegarLoop]: Abstraction has 48 states and 63 transitions. [2021-11-13 18:50:50,634 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.125) internal successors, (17), 7 states have internal predecessors, (17), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 18:50:50,634 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 63 transitions. [2021-11-13 18:50:50,635 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-13 18:50:50,635 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:50:50,636 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:50:50,654 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-11-13 18:50:50,854 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/mathsat -unsat_core_generation=3 [2021-11-13 18:50:50,855 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:50:50,858 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:50:50,858 INFO L85 PathProgramCache]: Analyzing trace with hash 551065955, now seen corresponding path program 1 times [2021-11-13 18:50:50,858 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-11-13 18:50:50,859 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [32528492] [2021-11-13 18:50:50,859 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:50:50,859 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-13 18:50:50,860 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/mathsat [2021-11-13 18:50:50,861 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-13 18:50:50,864 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-11-13 18:50:50,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:50:50,927 INFO L263 TraceCheckSpWp]: Trace formula consists of 35 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-13 18:50:50,929 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:50:51,255 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 18:50:51,256 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 18:50:52,124 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 18:50:52,124 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-11-13 18:50:52,125 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [32528492] [2021-11-13 18:50:52,125 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [32528492] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-13 18:50:52,125 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-13 18:50:52,125 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6, 6] imperfect sequences [] total 10 [2021-11-13 18:50:52,126 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [626833032] [2021-11-13 18:50:52,126 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-13 18:50:52,126 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-13 18:50:52,127 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-11-13 18:50:52,127 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-13 18:50:52,128 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2021-11-13 18:50:52,128 INFO L87 Difference]: Start difference. First operand 48 states and 63 transitions. Second operand has 10 states, 10 states have (on average 1.8) internal successors, (18), 8 states have internal predecessors, (18), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 18:50:54,431 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-13 18:50:54,678 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:50:54,678 INFO L93 Difference]: Finished difference Result 59 states and 75 transitions. [2021-11-13 18:50:54,681 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-13 18:50:54,681 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 1.8) internal successors, (18), 8 states have internal predecessors, (18), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2021-11-13 18:50:54,682 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:50:54,683 INFO L225 Difference]: With dead ends: 59 [2021-11-13 18:50:54,683 INFO L226 Difference]: Without dead ends: 55 [2021-11-13 18:50:54,684 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=31, Invalid=79, Unknown=0, NotChecked=0, Total=110 [2021-11-13 18:50:54,685 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 27 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 49 mSolverCounterSat, 13 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2409.83ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 68 SdHoareTripleChecker+Invalid, 63 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.53ms SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 49 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2488.44ms IncrementalHoareTripleChecker+Time [2021-11-13 18:50:54,686 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 68 Invalid, 63 Unknown, 0 Unchecked, 2.53ms Time], IncrementalHoareTripleChecker [13 Valid, 49 Invalid, 1 Unknown, 0 Unchecked, 2488.44ms Time] [2021-11-13 18:50:54,687 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2021-11-13 18:50:54,697 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2021-11-13 18:50:54,697 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 44 states have (on average 1.3181818181818181) internal successors, (58), 46 states have internal predecessors, (58), 6 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-13 18:50:54,699 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 68 transitions. [2021-11-13 18:50:54,700 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 68 transitions. Word has length 11 [2021-11-13 18:50:54,700 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:50:54,700 INFO L470 AbstractCegarLoop]: Abstraction has 55 states and 68 transitions. [2021-11-13 18:50:54,700 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 1.8) internal successors, (18), 8 states have internal predecessors, (18), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 18:50:54,701 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 68 transitions. [2021-11-13 18:50:54,702 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-11-13 18:50:54,702 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:50:54,702 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:50:54,719 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2021-11-13 18:50:54,915 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/mathsat -unsat_core_generation=3 [2021-11-13 18:50:54,916 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:50:54,917 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:50:54,917 INFO L85 PathProgramCache]: Analyzing trace with hash 1399787298, now seen corresponding path program 1 times [2021-11-13 18:50:54,917 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-11-13 18:50:54,918 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1341829013] [2021-11-13 18:50:54,918 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:50:54,918 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-13 18:50:54,919 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/mathsat [2021-11-13 18:50:54,923 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-13 18:50:54,931 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-11-13 18:50:54,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:50:54,983 INFO L263 TraceCheckSpWp]: Trace formula consists of 44 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-13 18:50:54,984 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:50:55,088 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 18:50:55,088 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 18:50:55,275 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 18:50:55,275 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-11-13 18:50:55,276 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1341829013] [2021-11-13 18:50:55,276 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1341829013] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 18:50:55,276 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-13 18:50:55,276 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 9 [2021-11-13 18:50:55,276 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1874652107] [2021-11-13 18:50:55,277 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-13 18:50:55,277 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-13 18:50:55,277 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-11-13 18:50:55,278 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-13 18:50:55,278 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2021-11-13 18:50:55,279 INFO L87 Difference]: Start difference. First operand 55 states and 68 transitions. Second operand has 10 states, 10 states have (on average 2.5) internal successors, (25), 9 states have internal predecessors, (25), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 18:50:56,077 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:50:56,077 INFO L93 Difference]: Finished difference Result 102 states and 127 transitions. [2021-11-13 18:50:56,080 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-13 18:50:56,080 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.5) internal successors, (25), 9 states have internal predecessors, (25), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2021-11-13 18:50:56,081 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:50:56,082 INFO L225 Difference]: With dead ends: 102 [2021-11-13 18:50:56,082 INFO L226 Difference]: Without dead ends: 88 [2021-11-13 18:50:56,083 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=87, Invalid=185, Unknown=0, NotChecked=0, Total=272 [2021-11-13 18:50:56,084 INFO L933 BasicCegarLoop]: 30 mSDtfsCounter, 104 mSDsluCounter, 155 mSDsCounter, 0 mSdLazyCounter, 82 mSolverCounterSat, 36 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 492.14ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 104 SdHoareTripleChecker+Valid, 185 SdHoareTripleChecker+Invalid, 118 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.88ms SdHoareTripleChecker+Time, 36 IncrementalHoareTripleChecker+Valid, 82 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 562.83ms IncrementalHoareTripleChecker+Time [2021-11-13 18:50:56,085 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [104 Valid, 185 Invalid, 118 Unknown, 0 Unchecked, 3.88ms Time], IncrementalHoareTripleChecker [36 Valid, 82 Invalid, 0 Unknown, 0 Unchecked, 562.83ms Time] [2021-11-13 18:50:56,086 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2021-11-13 18:50:56,101 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 63. [2021-11-13 18:50:56,104 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 52 states have (on average 1.2884615384615385) internal successors, (67), 54 states have internal predecessors, (67), 6 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-13 18:50:56,105 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 77 transitions. [2021-11-13 18:50:56,106 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 77 transitions. Word has length 16 [2021-11-13 18:50:56,106 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:50:56,106 INFO L470 AbstractCegarLoop]: Abstraction has 63 states and 77 transitions. [2021-11-13 18:50:56,107 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.5) internal successors, (25), 9 states have internal predecessors, (25), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 18:50:56,107 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 77 transitions. [2021-11-13 18:50:56,108 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-11-13 18:50:56,108 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:50:56,108 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:50:56,123 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/mathsat -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2021-11-13 18:50:56,317 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/mathsat -unsat_core_generation=3 [2021-11-13 18:50:56,318 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:50:56,319 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:50:56,319 INFO L85 PathProgramCache]: Analyzing trace with hash 64414499, now seen corresponding path program 1 times [2021-11-13 18:50:56,319 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-11-13 18:50:56,320 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [250225866] [2021-11-13 18:50:56,320 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:50:56,320 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-13 18:50:56,320 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/mathsat [2021-11-13 18:50:56,321 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-13 18:50:56,322 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2021-11-13 18:50:56,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:50:56,390 INFO L263 TraceCheckSpWp]: Trace formula consists of 45 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-13 18:50:56,392 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:50:56,845 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 18:50:56,846 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 18:50:59,302 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 18:50:59,302 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-11-13 18:50:59,302 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [250225866] [2021-11-13 18:50:59,303 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [250225866] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 18:50:59,303 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-13 18:50:59,303 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 14 [2021-11-13 18:50:59,303 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [274029746] [2021-11-13 18:50:59,304 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-13 18:50:59,304 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-13 18:50:59,305 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-11-13 18:50:59,305 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-13 18:50:59,306 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=137, Unknown=0, NotChecked=0, Total=182 [2021-11-13 18:50:59,306 INFO L87 Difference]: Start difference. First operand 63 states and 77 transitions. Second operand has 14 states, 14 states have (on average 2.142857142857143) internal successors, (30), 12 states have internal predecessors, (30), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 18:51:02,483 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-13 18:51:03,858 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:51:03,858 INFO L93 Difference]: Finished difference Result 119 states and 158 transitions. [2021-11-13 18:51:03,861 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-13 18:51:03,861 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.142857142857143) internal successors, (30), 12 states have internal predecessors, (30), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 17 [2021-11-13 18:51:03,862 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:51:03,863 INFO L225 Difference]: With dead ends: 119 [2021-11-13 18:51:03,864 INFO L226 Difference]: Without dead ends: 111 [2021-11-13 18:51:03,865 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=81, Invalid=225, Unknown=0, NotChecked=0, Total=306 [2021-11-13 18:51:03,866 INFO L933 BasicCegarLoop]: 30 mSDtfsCounter, 99 mSDsluCounter, 173 mSDsCounter, 0 mSdLazyCounter, 200 mSolverCounterSat, 57 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3294.99ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 104 SdHoareTripleChecker+Valid, 203 SdHoareTripleChecker+Invalid, 258 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 5.54ms SdHoareTripleChecker+Time, 57 IncrementalHoareTripleChecker+Valid, 200 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3494.41ms IncrementalHoareTripleChecker+Time [2021-11-13 18:51:03,867 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [104 Valid, 203 Invalid, 258 Unknown, 0 Unchecked, 5.54ms Time], IncrementalHoareTripleChecker [57 Valid, 200 Invalid, 1 Unknown, 0 Unchecked, 3494.41ms Time] [2021-11-13 18:51:03,869 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2021-11-13 18:51:03,894 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 90. [2021-11-13 18:51:03,895 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 73 states have (on average 1.2602739726027397) internal successors, (92), 76 states have internal predecessors, (92), 11 states have call successors, (11), 5 states have call predecessors, (11), 5 states have return successors, (9), 8 states have call predecessors, (9), 9 states have call successors, (9) [2021-11-13 18:51:03,897 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 112 transitions. [2021-11-13 18:51:03,898 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 112 transitions. Word has length 17 [2021-11-13 18:51:03,898 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:51:03,898 INFO L470 AbstractCegarLoop]: Abstraction has 90 states and 112 transitions. [2021-11-13 18:51:03,899 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.142857142857143) internal successors, (30), 12 states have internal predecessors, (30), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 18:51:03,899 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 112 transitions. [2021-11-13 18:51:03,901 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-13 18:51:03,901 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:51:03,902 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:51:03,919 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/mathsat -unsat_core_generation=3 (7)] Ended with exit code 0 [2021-11-13 18:51:04,115 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/mathsat -unsat_core_generation=3 [2021-11-13 18:51:04,116 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:51:04,116 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:51:04,116 INFO L85 PathProgramCache]: Analyzing trace with hash 2118336314, now seen corresponding path program 1 times [2021-11-13 18:51:04,117 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-11-13 18:51:04,117 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [995052148] [2021-11-13 18:51:04,117 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:51:04,117 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-13 18:51:04,117 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/mathsat [2021-11-13 18:51:04,118 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-13 18:51:04,120 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2021-11-13 18:51:04,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:51:04,178 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-13 18:51:04,180 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:51:04,249 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 18:51:04,250 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 18:51:04,323 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 18:51:04,323 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-11-13 18:51:04,323 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [995052148] [2021-11-13 18:51:04,324 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [995052148] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-13 18:51:04,324 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-13 18:51:04,324 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-13 18:51:04,324 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [131522836] [2021-11-13 18:51:04,325 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-13 18:51:04,325 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-13 18:51:04,325 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-11-13 18:51:04,326 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-13 18:51:04,326 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-13 18:51:04,327 INFO L87 Difference]: Start difference. First operand 90 states and 112 transitions. Second operand has 3 states, 3 states have (on average 5.666666666666667) internal successors, (17), 3 states have internal predecessors, (17), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 18:51:04,360 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:51:04,360 INFO L93 Difference]: Finished difference Result 107 states and 131 transitions. [2021-11-13 18:51:04,366 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-13 18:51:04,367 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 5.666666666666667) internal successors, (17), 3 states have internal predecessors, (17), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 20 [2021-11-13 18:51:04,367 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:51:04,373 INFO L225 Difference]: With dead ends: 107 [2021-11-13 18:51:04,373 INFO L226 Difference]: Without dead ends: 66 [2021-11-13 18:51:04,374 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-13 18:51:04,376 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 0 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 7 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 13.69ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 8 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.53ms SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 7 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 22.29ms IncrementalHoareTripleChecker+Time [2021-11-13 18:51:04,376 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 38 Invalid, 8 Unknown, 0 Unchecked, 0.53ms Time], IncrementalHoareTripleChecker [1 Valid, 7 Invalid, 0 Unknown, 0 Unchecked, 22.29ms Time] [2021-11-13 18:51:04,383 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2021-11-13 18:51:04,397 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2021-11-13 18:51:04,404 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 54 states have (on average 1.2592592592592593) internal successors, (68), 56 states have internal predecessors, (68), 7 states have call successors, (7), 3 states have call predecessors, (7), 3 states have return successors, (6), 5 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-13 18:51:04,409 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 81 transitions. [2021-11-13 18:51:04,409 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 81 transitions. Word has length 20 [2021-11-13 18:51:04,410 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:51:04,410 INFO L470 AbstractCegarLoop]: Abstraction has 65 states and 81 transitions. [2021-11-13 18:51:04,411 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 5.666666666666667) internal successors, (17), 3 states have internal predecessors, (17), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 18:51:04,411 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 81 transitions. [2021-11-13 18:51:04,415 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-13 18:51:04,418 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:51:04,418 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:51:04,438 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/mathsat -unsat_core_generation=3 (8)] Forceful destruction successful, exit code 0 [2021-11-13 18:51:04,630 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/mathsat -unsat_core_generation=3 [2021-11-13 18:51:04,630 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:51:04,631 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:51:04,631 INFO L85 PathProgramCache]: Analyzing trace with hash -668748450, now seen corresponding path program 1 times [2021-11-13 18:51:04,631 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-11-13 18:51:04,632 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [476074394] [2021-11-13 18:51:04,632 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:51:04,632 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-13 18:51:04,632 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/mathsat [2021-11-13 18:51:04,635 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-13 18:51:04,670 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/mathsat -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2021-11-13 18:51:04,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:51:04,716 INFO L263 TraceCheckSpWp]: Trace formula consists of 64 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-13 18:51:04,718 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:51:04,921 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 18:51:04,922 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 18:51:05,311 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 18:51:05,311 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-11-13 18:51:05,312 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [476074394] [2021-11-13 18:51:05,312 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [476074394] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 18:51:05,312 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-13 18:51:05,312 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 17 [2021-11-13 18:51:05,312 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1033644473] [2021-11-13 18:51:05,312 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-13 18:51:05,313 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-13 18:51:05,313 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-11-13 18:51:05,314 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-13 18:51:05,314 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=223, Unknown=0, NotChecked=0, Total=306 [2021-11-13 18:51:05,314 INFO L87 Difference]: Start difference. First operand 65 states and 81 transitions. Second operand has 18 states, 18 states have (on average 2.7222222222222223) internal successors, (49), 17 states have internal predecessors, (49), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 18:51:07,812 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:51:07,812 INFO L93 Difference]: Finished difference Result 241 states and 306 transitions. [2021-11-13 18:51:07,815 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-11-13 18:51:07,815 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.7222222222222223) internal successors, (49), 17 states have internal predecessors, (49), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 28 [2021-11-13 18:51:07,815 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:51:07,818 INFO L225 Difference]: With dead ends: 241 [2021-11-13 18:51:07,818 INFO L226 Difference]: Without dead ends: 229 [2021-11-13 18:51:07,820 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 214 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=409, Invalid=923, Unknown=0, NotChecked=0, Total=1332 [2021-11-13 18:51:07,822 INFO L933 BasicCegarLoop]: 73 mSDtfsCounter, 461 mSDsluCounter, 553 mSDsCounter, 0 mSdLazyCounter, 318 mSolverCounterSat, 155 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1274.38ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 461 SdHoareTripleChecker+Valid, 626 SdHoareTripleChecker+Invalid, 473 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 12.21ms SdHoareTripleChecker+Time, 155 IncrementalHoareTripleChecker+Valid, 318 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1461.17ms IncrementalHoareTripleChecker+Time [2021-11-13 18:51:07,823 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [461 Valid, 626 Invalid, 473 Unknown, 0 Unchecked, 12.21ms Time], IncrementalHoareTripleChecker [155 Valid, 318 Invalid, 0 Unknown, 0 Unchecked, 1461.17ms Time] [2021-11-13 18:51:07,824 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 229 states. [2021-11-13 18:51:07,845 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 229 to 116. [2021-11-13 18:51:07,846 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 116 states, 98 states have (on average 1.2346938775510203) internal successors, (121), 102 states have internal predecessors, (121), 11 states have call successors, (11), 6 states have call predecessors, (11), 6 states have return successors, (10), 7 states have call predecessors, (10), 10 states have call successors, (10) [2021-11-13 18:51:07,848 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 142 transitions. [2021-11-13 18:51:07,848 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 142 transitions. Word has length 28 [2021-11-13 18:51:07,849 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:51:07,849 INFO L470 AbstractCegarLoop]: Abstraction has 116 states and 142 transitions. [2021-11-13 18:51:07,849 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 2.7222222222222223) internal successors, (49), 17 states have internal predecessors, (49), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 18:51:07,850 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 142 transitions. [2021-11-13 18:51:07,851 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-11-13 18:51:07,852 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:51:07,852 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:51:07,882 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/mathsat -unsat_core_generation=3 (9)] Ended with exit code 0 [2021-11-13 18:51:08,083 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/mathsat -unsat_core_generation=3 [2021-11-13 18:51:08,083 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:51:08,084 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:51:08,084 INFO L85 PathProgramCache]: Analyzing trace with hash 1350184604, now seen corresponding path program 1 times [2021-11-13 18:51:08,084 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-11-13 18:51:08,085 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [956398610] [2021-11-13 18:51:08,085 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:51:08,085 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-13 18:51:08,085 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/mathsat [2021-11-13 18:51:08,087 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-13 18:51:08,092 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/mathsat -unsat_core_generation=3 (10)] Waiting until timeout for monitored process [2021-11-13 18:51:08,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:51:08,175 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-13 18:51:08,177 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:51:08,373 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 2 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 18:51:08,374 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 18:51:08,714 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 2 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 18:51:08,714 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-11-13 18:51:08,714 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [956398610] [2021-11-13 18:51:08,715 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [956398610] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 18:51:08,715 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-13 18:51:08,715 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 16 [2021-11-13 18:51:08,715 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1330938683] [2021-11-13 18:51:08,715 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-13 18:51:08,716 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-13 18:51:08,716 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-11-13 18:51:08,716 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-13 18:51:08,717 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=174, Unknown=0, NotChecked=0, Total=240 [2021-11-13 18:51:08,717 INFO L87 Difference]: Start difference. First operand 116 states and 142 transitions. Second operand has 16 states, 16 states have (on average 3.0625) internal successors, (49), 16 states have internal predecessors, (49), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-13 18:51:10,469 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:51:10,469 INFO L93 Difference]: Finished difference Result 213 states and 261 transitions. [2021-11-13 18:51:10,473 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-13 18:51:10,473 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 3.0625) internal successors, (49), 16 states have internal predecessors, (49), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 29 [2021-11-13 18:51:10,474 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:51:10,476 INFO L225 Difference]: With dead ends: 213 [2021-11-13 18:51:10,476 INFO L226 Difference]: Without dead ends: 206 [2021-11-13 18:51:10,477 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 117 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=266, Invalid=604, Unknown=0, NotChecked=0, Total=870 [2021-11-13 18:51:10,478 INFO L933 BasicCegarLoop]: 61 mSDtfsCounter, 303 mSDsluCounter, 359 mSDsCounter, 0 mSdLazyCounter, 205 mSolverCounterSat, 133 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 951.24ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 303 SdHoareTripleChecker+Valid, 420 SdHoareTripleChecker+Invalid, 338 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 15.05ms SdHoareTripleChecker+Time, 133 IncrementalHoareTripleChecker+Valid, 205 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1088.44ms IncrementalHoareTripleChecker+Time [2021-11-13 18:51:10,479 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [303 Valid, 420 Invalid, 338 Unknown, 0 Unchecked, 15.05ms Time], IncrementalHoareTripleChecker [133 Valid, 205 Invalid, 0 Unknown, 0 Unchecked, 1088.44ms Time] [2021-11-13 18:51:10,480 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 206 states. [2021-11-13 18:51:10,504 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 206 to 192. [2021-11-13 18:51:10,512 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 192 states, 153 states have (on average 1.2941176470588236) internal successors, (198), 161 states have internal predecessors, (198), 25 states have call successors, (25), 13 states have call predecessors, (25), 13 states have return successors, (17), 17 states have call predecessors, (17), 17 states have call successors, (17) [2021-11-13 18:51:10,516 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 192 states to 192 states and 240 transitions. [2021-11-13 18:51:10,517 INFO L78 Accepts]: Start accepts. Automaton has 192 states and 240 transitions. Word has length 29 [2021-11-13 18:51:10,518 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:51:10,519 INFO L470 AbstractCegarLoop]: Abstraction has 192 states and 240 transitions. [2021-11-13 18:51:10,519 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 3.0625) internal successors, (49), 16 states have internal predecessors, (49), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-13 18:51:10,519 INFO L276 IsEmpty]: Start isEmpty. Operand 192 states and 240 transitions. [2021-11-13 18:51:10,522 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-11-13 18:51:10,523 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:51:10,524 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:51:10,544 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/mathsat -unsat_core_generation=3 (10)] Forceful destruction successful, exit code 0 [2021-11-13 18:51:10,744 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/mathsat -unsat_core_generation=3 [2021-11-13 18:51:10,744 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:51:10,745 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:51:10,745 INFO L85 PathProgramCache]: Analyzing trace with hash 1351972064, now seen corresponding path program 1 times [2021-11-13 18:51:10,745 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-11-13 18:51:10,745 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1597690709] [2021-11-13 18:51:10,745 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:51:10,745 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-13 18:51:10,745 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/mathsat [2021-11-13 18:51:10,746 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-13 18:51:10,756 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/mathsat -unsat_core_generation=3 (11)] Waiting until timeout for monitored process [2021-11-13 18:51:10,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:51:10,822 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-13 18:51:10,823 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:51:11,474 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 2 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 18:51:11,474 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 18:51:15,476 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 2 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 18:51:15,476 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-11-13 18:51:15,476 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1597690709] [2021-11-13 18:51:15,476 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1597690709] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 18:51:15,476 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-13 18:51:15,476 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 19 [2021-11-13 18:51:15,477 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [519722817] [2021-11-13 18:51:15,477 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-13 18:51:15,477 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-13 18:51:15,477 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-11-13 18:51:15,477 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-13 18:51:15,478 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=260, Unknown=0, NotChecked=0, Total=342 [2021-11-13 18:51:15,478 INFO L87 Difference]: Start difference. First operand 192 states and 240 transitions. Second operand has 19 states, 19 states have (on average 2.473684210526316) internal successors, (47), 17 states have internal predecessors, (47), 4 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-13 18:51:22,065 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-13 18:51:24,069 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-13 18:51:26,991 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:51:26,991 INFO L93 Difference]: Finished difference Result 434 states and 560 transitions. [2021-11-13 18:51:26,994 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-13 18:51:26,995 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 2.473684210526316) internal successors, (47), 17 states have internal predecessors, (47), 4 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 29 [2021-11-13 18:51:26,995 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:51:26,998 INFO L225 Difference]: With dead ends: 434 [2021-11-13 18:51:26,998 INFO L226 Difference]: Without dead ends: 347 [2021-11-13 18:51:27,001 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 38 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 124 ImplicationChecksByTransitivity, 7.9s TimeCoverageRelationStatistics Valid=201, Invalid=555, Unknown=0, NotChecked=0, Total=756 [2021-11-13 18:51:27,002 INFO L933 BasicCegarLoop]: 36 mSDtfsCounter, 116 mSDsluCounter, 281 mSDsCounter, 0 mSdLazyCounter, 305 mSolverCounterSat, 83 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6265.91ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 122 SdHoareTripleChecker+Valid, 317 SdHoareTripleChecker+Invalid, 390 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 5.55ms SdHoareTripleChecker+Time, 83 IncrementalHoareTripleChecker+Valid, 305 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6487.36ms IncrementalHoareTripleChecker+Time [2021-11-13 18:51:27,002 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [122 Valid, 317 Invalid, 390 Unknown, 0 Unchecked, 5.55ms Time], IncrementalHoareTripleChecker [83 Valid, 305 Invalid, 2 Unknown, 0 Unchecked, 6487.36ms Time] [2021-11-13 18:51:27,003 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 347 states. [2021-11-13 18:51:27,029 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 347 to 269. [2021-11-13 18:51:27,030 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 269 states, 212 states have (on average 1.25) internal successors, (265), 222 states have internal predecessors, (265), 37 states have call successors, (37), 19 states have call predecessors, (37), 19 states have return successors, (29), 27 states have call predecessors, (29), 29 states have call successors, (29) [2021-11-13 18:51:27,035 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 269 states to 269 states and 331 transitions. [2021-11-13 18:51:27,035 INFO L78 Accepts]: Start accepts. Automaton has 269 states and 331 transitions. Word has length 29 [2021-11-13 18:51:27,035 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:51:27,035 INFO L470 AbstractCegarLoop]: Abstraction has 269 states and 331 transitions. [2021-11-13 18:51:27,036 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 2.473684210526316) internal successors, (47), 17 states have internal predecessors, (47), 4 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-13 18:51:27,036 INFO L276 IsEmpty]: Start isEmpty. Operand 269 states and 331 transitions. [2021-11-13 18:51:27,037 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-11-13 18:51:27,037 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:51:27,038 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:51:27,059 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/mathsat -unsat_core_generation=3 (11)] Forceful destruction successful, exit code 0 [2021-11-13 18:51:27,249 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/mathsat -unsat_core_generation=3 [2021-11-13 18:51:27,250 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:51:27,250 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:51:27,250 INFO L85 PathProgramCache]: Analyzing trace with hash 419727011, now seen corresponding path program 2 times [2021-11-13 18:51:27,250 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-11-13 18:51:27,251 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [610955003] [2021-11-13 18:51:27,251 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-13 18:51:27,251 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-13 18:51:27,251 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/mathsat [2021-11-13 18:51:27,252 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-13 18:51:27,253 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/mathsat -unsat_core_generation=3 (12)] Waiting until timeout for monitored process [2021-11-13 18:51:27,295 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2021-11-13 18:51:27,296 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 18:51:27,298 INFO L263 TraceCheckSpWp]: Trace formula consists of 35 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-13 18:51:27,300 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:51:27,550 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2021-11-13 18:51:27,550 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 18:51:27,882 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2021-11-13 18:51:27,882 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-11-13 18:51:27,883 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [610955003] [2021-11-13 18:51:27,883 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [610955003] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-13 18:51:27,883 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-13 18:51:27,883 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [] total 7 [2021-11-13 18:51:27,883 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [573838641] [2021-11-13 18:51:27,883 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-13 18:51:27,884 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-13 18:51:27,884 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-11-13 18:51:27,884 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-13 18:51:27,884 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-11-13 18:51:27,884 INFO L87 Difference]: Start difference. First operand 269 states and 331 transitions. Second operand has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 5 states have internal predecessors, (13), 1 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 18:51:28,045 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:51:28,045 INFO L93 Difference]: Finished difference Result 393 states and 474 transitions. [2021-11-13 18:51:28,048 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-13 18:51:28,048 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 5 states have internal predecessors, (13), 1 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 29 [2021-11-13 18:51:28,048 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:51:28,051 INFO L225 Difference]: With dead ends: 393 [2021-11-13 18:51:28,052 INFO L226 Difference]: Without dead ends: 385 [2021-11-13 18:51:28,052 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 50 SyntacticMatches, 1 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-11-13 18:51:28,053 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 13 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 112.50ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 67 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.07ms SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 126.67ms IncrementalHoareTripleChecker+Time [2021-11-13 18:51:28,054 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 67 Invalid, 43 Unknown, 0 Unchecked, 1.07ms Time], IncrementalHoareTripleChecker [4 Valid, 39 Invalid, 0 Unknown, 0 Unchecked, 126.67ms Time] [2021-11-13 18:51:28,055 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 385 states. [2021-11-13 18:51:28,081 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 385 to 365. [2021-11-13 18:51:28,082 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 365 states, 286 states have (on average 1.2097902097902098) internal successors, (346), 297 states have internal predecessors, (346), 47 states have call successors, (47), 31 states have call predecessors, (47), 31 states have return successors, (39), 36 states have call predecessors, (39), 39 states have call successors, (39) [2021-11-13 18:51:28,085 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 365 states to 365 states and 432 transitions. [2021-11-13 18:51:28,085 INFO L78 Accepts]: Start accepts. Automaton has 365 states and 432 transitions. Word has length 29 [2021-11-13 18:51:28,086 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:51:28,086 INFO L470 AbstractCegarLoop]: Abstraction has 365 states and 432 transitions. [2021-11-13 18:51:28,086 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 5 states have internal predecessors, (13), 1 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 18:51:28,086 INFO L276 IsEmpty]: Start isEmpty. Operand 365 states and 432 transitions. [2021-11-13 18:51:28,093 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-11-13 18:51:28,093 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:51:28,093 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2021-11-13 18:51:28,108 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/mathsat -unsat_core_generation=3 (12)] Forceful destruction successful, exit code 0 [2021-11-13 18:51:28,308 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/mathsat -unsat_core_generation=3 [2021-11-13 18:51:28,308 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:51:28,308 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:51:28,309 INFO L85 PathProgramCache]: Analyzing trace with hash -815549923, now seen corresponding path program 2 times [2021-11-13 18:51:28,309 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-11-13 18:51:28,309 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1137539397] [2021-11-13 18:51:28,309 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-13 18:51:28,309 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-13 18:51:28,310 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/mathsat [2021-11-13 18:51:28,311 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-13 18:51:28,344 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/mathsat -unsat_core_generation=3 (13)] Waiting until timeout for monitored process [2021-11-13 18:51:28,397 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-13 18:51:28,397 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 18:51:28,405 INFO L263 TraceCheckSpWp]: Trace formula consists of 72 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-13 18:51:28,407 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:51:28,575 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 11 proven. 7 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-13 18:51:28,575 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 18:51:28,699 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 11 proven. 7 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-13 18:51:28,700 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-11-13 18:51:28,700 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1137539397] [2021-11-13 18:51:28,700 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1137539397] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 18:51:28,700 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-13 18:51:28,700 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 5] total 7 [2021-11-13 18:51:28,700 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [539911925] [2021-11-13 18:51:28,700 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-13 18:51:28,701 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-13 18:51:28,701 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-11-13 18:51:28,701 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-13 18:51:28,701 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-11-13 18:51:28,701 INFO L87 Difference]: Start difference. First operand 365 states and 432 transitions. Second operand has 7 states, 7 states have (on average 5.428571428571429) internal successors, (38), 7 states have internal predecessors, (38), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-13 18:51:28,806 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:51:28,806 INFO L93 Difference]: Finished difference Result 497 states and 588 transitions. [2021-11-13 18:51:28,807 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-13 18:51:28,807 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 5.428571428571429) internal successors, (38), 7 states have internal predecessors, (38), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 32 [2021-11-13 18:51:28,809 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:51:28,812 INFO L225 Difference]: With dead ends: 497 [2021-11-13 18:51:28,812 INFO L226 Difference]: Without dead ends: 302 [2021-11-13 18:51:28,813 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 56 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-11-13 18:51:28,814 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 6 mSDsluCounter, 66 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 58.72ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 90 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.77ms SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 83.40ms IncrementalHoareTripleChecker+Time [2021-11-13 18:51:28,814 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 90 Invalid, 41 Unknown, 0 Unchecked, 0.77ms Time], IncrementalHoareTripleChecker [4 Valid, 37 Invalid, 0 Unknown, 0 Unchecked, 83.40ms Time] [2021-11-13 18:51:28,816 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 302 states. [2021-11-13 18:51:28,846 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 302 to 301. [2021-11-13 18:51:28,847 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 301 states, 238 states have (on average 1.2058823529411764) internal successors, (287), 247 states have internal predecessors, (287), 37 states have call successors, (37), 25 states have call predecessors, (37), 25 states have return successors, (31), 28 states have call predecessors, (31), 31 states have call successors, (31) [2021-11-13 18:51:28,850 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 301 states to 301 states and 355 transitions. [2021-11-13 18:51:28,851 INFO L78 Accepts]: Start accepts. Automaton has 301 states and 355 transitions. Word has length 32 [2021-11-13 18:51:28,851 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:51:28,851 INFO L470 AbstractCegarLoop]: Abstraction has 301 states and 355 transitions. [2021-11-13 18:51:28,852 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 5.428571428571429) internal successors, (38), 7 states have internal predecessors, (38), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-13 18:51:28,852 INFO L276 IsEmpty]: Start isEmpty. Operand 301 states and 355 transitions. [2021-11-13 18:51:28,856 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-11-13 18:51:28,856 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:51:28,856 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1] [2021-11-13 18:51:28,871 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/mathsat -unsat_core_generation=3 (13)] Forceful destruction successful, exit code 0 [2021-11-13 18:51:29,070 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/mathsat -unsat_core_generation=3 [2021-11-13 18:51:29,070 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:51:29,071 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:51:29,071 INFO L85 PathProgramCache]: Analyzing trace with hash -2147180861, now seen corresponding path program 3 times [2021-11-13 18:51:29,071 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-11-13 18:51:29,071 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1237517165] [2021-11-13 18:51:29,071 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-13 18:51:29,071 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-13 18:51:29,071 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/mathsat [2021-11-13 18:51:29,072 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-13 18:51:29,075 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/mathsat -unsat_core_generation=3 (14)] Waiting until timeout for monitored process [2021-11-13 18:51:31,204 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-13 18:51:31,204 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 18:51:31,223 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-13 18:51:31,225 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:51:35,914 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 27 proven. 12 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-13 18:51:35,914 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 18:51:52,268 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 24 proven. 15 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-13 18:51:52,268 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-11-13 18:51:52,268 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1237517165] [2021-11-13 18:51:52,268 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1237517165] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 18:51:52,268 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-13 18:51:52,269 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 24 [2021-11-13 18:51:52,269 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [257380017] [2021-11-13 18:51:52,269 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-13 18:51:52,270 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-13 18:51:52,270 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-11-13 18:51:52,270 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-13 18:51:52,270 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=444, Unknown=1, NotChecked=0, Total=552 [2021-11-13 18:51:52,271 INFO L87 Difference]: Start difference. First operand 301 states and 355 transitions. Second operand has 24 states, 24 states have (on average 2.3333333333333335) internal successors, (56), 22 states have internal predecessors, (56), 6 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-13 18:52:01,686 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:52:01,686 INFO L93 Difference]: Finished difference Result 456 states and 551 transitions. [2021-11-13 18:52:01,688 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-13 18:52:01,689 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 2.3333333333333335) internal successors, (56), 22 states have internal predecessors, (56), 6 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 41 [2021-11-13 18:52:01,689 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:52:01,692 INFO L225 Difference]: With dead ends: 456 [2021-11-13 18:52:01,692 INFO L226 Difference]: Without dead ends: 441 [2021-11-13 18:52:01,693 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 59 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 196 ImplicationChecksByTransitivity, 21.5s TimeCoverageRelationStatistics Valid=166, Invalid=703, Unknown=1, NotChecked=0, Total=870 [2021-11-13 18:52:01,694 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 82 mSDsluCounter, 223 mSDsCounter, 0 mSdLazyCounter, 92 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2386.57ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 83 SdHoareTripleChecker+Valid, 251 SdHoareTripleChecker+Invalid, 141 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.60ms SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 92 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 32 IncrementalHoareTripleChecker+Unchecked, 2500.63ms IncrementalHoareTripleChecker+Time [2021-11-13 18:52:01,694 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [83 Valid, 251 Invalid, 141 Unknown, 0 Unchecked, 2.60ms Time], IncrementalHoareTripleChecker [17 Valid, 92 Invalid, 0 Unknown, 32 Unchecked, 2500.63ms Time] [2021-11-13 18:52:01,695 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 441 states. [2021-11-13 18:52:01,725 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 441 to 402. [2021-11-13 18:52:01,726 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 402 states, 317 states have (on average 1.1861198738170347) internal successors, (376), 328 states have internal predecessors, (376), 53 states have call successors, (53), 33 states have call predecessors, (53), 31 states have return successors, (48), 40 states have call predecessors, (48), 48 states have call successors, (48) [2021-11-13 18:52:01,729 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 402 states to 402 states and 477 transitions. [2021-11-13 18:52:01,730 INFO L78 Accepts]: Start accepts. Automaton has 402 states and 477 transitions. Word has length 41 [2021-11-13 18:52:01,730 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:52:01,730 INFO L470 AbstractCegarLoop]: Abstraction has 402 states and 477 transitions. [2021-11-13 18:52:01,730 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 2.3333333333333335) internal successors, (56), 22 states have internal predecessors, (56), 6 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-13 18:52:01,730 INFO L276 IsEmpty]: Start isEmpty. Operand 402 states and 477 transitions. [2021-11-13 18:52:01,732 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-11-13 18:52:01,732 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:52:01,732 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 4, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:52:01,754 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/mathsat -unsat_core_generation=3 (14)] Forceful destruction successful, exit code 0 [2021-11-13 18:52:01,945 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/mathsat -unsat_core_generation=3 [2021-11-13 18:52:01,945 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:52:01,945 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:52:01,946 INFO L85 PathProgramCache]: Analyzing trace with hash -372173499, now seen corresponding path program 1 times [2021-11-13 18:52:01,946 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-11-13 18:52:01,946 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1078327572] [2021-11-13 18:52:01,946 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:52:01,946 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-13 18:52:01,947 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/mathsat [2021-11-13 18:52:01,947 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-13 18:52:01,958 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/mathsat -unsat_core_generation=3 (15)] Waiting until timeout for monitored process [2021-11-13 18:52:02,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:52:02,021 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-13 18:52:02,027 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:52:03,036 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 6 proven. 42 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-13 18:52:03,036 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 18:52:26,441 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 24 proven. 15 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-13 18:52:26,441 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-11-13 18:52:26,441 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1078327572] [2021-11-13 18:52:26,441 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1078327572] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 18:52:26,441 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-13 18:52:26,441 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 13] total 26 [2021-11-13 18:52:26,441 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [48542540] [2021-11-13 18:52:26,441 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-13 18:52:26,442 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-13 18:52:26,442 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-11-13 18:52:26,442 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-13 18:52:26,443 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=509, Unknown=1, NotChecked=0, Total=650 [2021-11-13 18:52:26,443 INFO L87 Difference]: Start difference. First operand 402 states and 477 transitions. Second operand has 26 states, 26 states have (on average 2.3461538461538463) internal successors, (61), 24 states have internal predecessors, (61), 6 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-13 18:52:32,175 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-13 18:52:39,667 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-13 18:52:52,552 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-13 18:52:54,556 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-13 18:52:56,561 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-13 18:52:58,366 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:52:58,366 INFO L93 Difference]: Finished difference Result 653 states and 774 transitions. [2021-11-13 18:52:58,368 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-13 18:52:58,368 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.3461538461538463) internal successors, (61), 24 states have internal predecessors, (61), 6 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 41 [2021-11-13 18:52:58,368 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:52:58,372 INFO L225 Difference]: With dead ends: 653 [2021-11-13 18:52:58,372 INFO L226 Difference]: Without dead ends: 543 [2021-11-13 18:52:58,373 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 59 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 186 ImplicationChecksByTransitivity, 25.5s TimeCoverageRelationStatistics Valid=261, Invalid=860, Unknown=1, NotChecked=0, Total=1122 [2021-11-13 18:52:58,373 INFO L933 BasicCegarLoop]: 38 mSDtfsCounter, 191 mSDsluCounter, 385 mSDsCounter, 0 mSdLazyCounter, 528 mSolverCounterSat, 163 mSolverCounterUnsat, 5 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 18101.15ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 198 SdHoareTripleChecker+Valid, 423 SdHoareTripleChecker+Invalid, 696 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 7.06ms SdHoareTripleChecker+Time, 163 IncrementalHoareTripleChecker+Valid, 528 IncrementalHoareTripleChecker+Invalid, 5 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 18537.62ms IncrementalHoareTripleChecker+Time [2021-11-13 18:52:58,374 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [198 Valid, 423 Invalid, 696 Unknown, 0 Unchecked, 7.06ms Time], IncrementalHoareTripleChecker [163 Valid, 528 Invalid, 5 Unknown, 0 Unchecked, 18537.62ms Time] [2021-11-13 18:52:58,375 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 543 states. [2021-11-13 18:52:58,426 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 543 to 468. [2021-11-13 18:52:58,427 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 468 states, 369 states have (on average 1.1626016260162602) internal successors, (429), 385 states have internal predecessors, (429), 60 states have call successors, (60), 40 states have call predecessors, (60), 38 states have return successors, (59), 42 states have call predecessors, (59), 59 states have call successors, (59) [2021-11-13 18:52:58,431 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 468 states to 468 states and 548 transitions. [2021-11-13 18:52:58,431 INFO L78 Accepts]: Start accepts. Automaton has 468 states and 548 transitions. Word has length 41 [2021-11-13 18:52:58,431 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:52:58,432 INFO L470 AbstractCegarLoop]: Abstraction has 468 states and 548 transitions. [2021-11-13 18:52:58,432 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 2.3461538461538463) internal successors, (61), 24 states have internal predecessors, (61), 6 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-13 18:52:58,432 INFO L276 IsEmpty]: Start isEmpty. Operand 468 states and 548 transitions. [2021-11-13 18:52:58,434 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-13 18:52:58,434 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:52:58,434 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1] [2021-11-13 18:52:58,446 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/mathsat -unsat_core_generation=3 (15)] Forceful destruction successful, exit code 0 [2021-11-13 18:52:58,638 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/mathsat -unsat_core_generation=3 [2021-11-13 18:52:58,638 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:52:58,639 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:52:58,639 INFO L85 PathProgramCache]: Analyzing trace with hash -1613408358, now seen corresponding path program 4 times [2021-11-13 18:52:58,639 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-11-13 18:52:58,639 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [992202621] [2021-11-13 18:52:58,640 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-13 18:52:58,640 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-13 18:52:58,640 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/mathsat [2021-11-13 18:52:58,642 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-13 18:52:58,643 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/mathsat -unsat_core_generation=3 (16)] Waiting until timeout for monitored process [2021-11-13 18:52:58,714 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-13 18:52:58,714 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 18:52:58,723 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-13 18:52:58,724 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:52:58,948 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 17 proven. 22 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-13 18:52:58,948 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 18:52:59,155 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 17 proven. 22 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-13 18:52:59,155 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-11-13 18:52:59,155 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [992202621] [2021-11-13 18:52:59,155 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [992202621] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 18:52:59,155 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-13 18:52:59,155 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 7] total 10 [2021-11-13 18:52:59,155 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1333990774] [2021-11-13 18:52:59,155 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-13 18:52:59,156 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-13 18:52:59,156 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-11-13 18:52:59,156 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-13 18:52:59,156 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2021-11-13 18:52:59,158 INFO L87 Difference]: Start difference. First operand 468 states and 548 transitions. Second operand has 10 states, 10 states have (on average 5.2) internal successors, (52), 10 states have internal predecessors, (52), 7 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-13 18:52:59,344 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:52:59,344 INFO L93 Difference]: Finished difference Result 594 states and 688 transitions. [2021-11-13 18:52:59,347 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-13 18:52:59,347 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 5.2) internal successors, (52), 10 states have internal predecessors, (52), 7 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) Word has length 44 [2021-11-13 18:52:59,347 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:52:59,351 INFO L225 Difference]: With dead ends: 594 [2021-11-13 18:52:59,351 INFO L226 Difference]: Without dead ends: 388 [2021-11-13 18:52:59,354 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 76 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2021-11-13 18:52:59,355 INFO L933 BasicCegarLoop]: 29 mSDtfsCounter, 14 mSDsluCounter, 107 mSDsCounter, 0 mSdLazyCounter, 64 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 111.58ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 136 SdHoareTripleChecker+Invalid, 70 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.00ms SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 64 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 138.65ms IncrementalHoareTripleChecker+Time [2021-11-13 18:52:59,356 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 136 Invalid, 70 Unknown, 0 Unchecked, 1.00ms Time], IncrementalHoareTripleChecker [6 Valid, 64 Invalid, 0 Unknown, 0 Unchecked, 138.65ms Time] [2021-11-13 18:52:59,358 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 388 states. [2021-11-13 18:52:59,406 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 388 to 388. [2021-11-13 18:52:59,407 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 388 states, 307 states have (on average 1.1563517915309447) internal successors, (355), 321 states have internal predecessors, (355), 48 states have call successors, (48), 34 states have call predecessors, (48), 32 states have return successors, (47), 32 states have call predecessors, (47), 47 states have call successors, (47) [2021-11-13 18:52:59,410 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 388 states to 388 states and 450 transitions. [2021-11-13 18:52:59,410 INFO L78 Accepts]: Start accepts. Automaton has 388 states and 450 transitions. Word has length 44 [2021-11-13 18:52:59,410 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:52:59,411 INFO L470 AbstractCegarLoop]: Abstraction has 388 states and 450 transitions. [2021-11-13 18:52:59,411 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 5.2) internal successors, (52), 10 states have internal predecessors, (52), 7 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-13 18:52:59,411 INFO L276 IsEmpty]: Start isEmpty. Operand 388 states and 450 transitions. [2021-11-13 18:52:59,413 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-13 18:52:59,413 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:52:59,413 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 5, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:52:59,430 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/mathsat -unsat_core_generation=3 (16)] Forceful destruction successful, exit code 0 [2021-11-13 18:52:59,625 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/mathsat -unsat_core_generation=3 [2021-11-13 18:52:59,626 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:52:59,626 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:52:59,626 INFO L85 PathProgramCache]: Analyzing trace with hash -2031199653, now seen corresponding path program 2 times [2021-11-13 18:52:59,626 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-11-13 18:52:59,626 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1804359465] [2021-11-13 18:52:59,626 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-13 18:52:59,627 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-13 18:52:59,627 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/mathsat [2021-11-13 18:52:59,628 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-13 18:52:59,630 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/mathsat -unsat_core_generation=3 (17)] Waiting until timeout for monitored process [2021-11-13 18:52:59,700 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-13 18:52:59,700 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 18:52:59,707 INFO L263 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-13 18:52:59,709 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:52:59,948 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 14 proven. 45 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-13 18:52:59,948 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 18:53:00,086 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 27 proven. 0 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2021-11-13 18:53:00,086 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-11-13 18:53:00,087 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1804359465] [2021-11-13 18:53:00,087 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1804359465] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-13 18:53:00,087 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-13 18:53:00,087 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [10] total 12 [2021-11-13 18:53:00,087 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [43503507] [2021-11-13 18:53:00,087 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 18:53:00,088 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-13 18:53:00,088 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-11-13 18:53:00,088 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-13 18:53:00,089 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-11-13 18:53:00,089 INFO L87 Difference]: Start difference. First operand 388 states and 450 transitions. Second operand has 4 states, 4 states have (on average 5.75) internal successors, (23), 4 states have internal predecessors, (23), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-13 18:53:00,168 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:53:00,169 INFO L93 Difference]: Finished difference Result 445 states and 511 transitions. [2021-11-13 18:53:00,170 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-13 18:53:00,170 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 5.75) internal successors, (23), 4 states have internal predecessors, (23), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 44 [2021-11-13 18:53:00,170 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:53:00,172 INFO L225 Difference]: With dead ends: 445 [2021-11-13 18:53:00,173 INFO L226 Difference]: Without dead ends: 331 [2021-11-13 18:53:00,173 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 76 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-11-13 18:53:00,174 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 1 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 45.48ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 16 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.34ms SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 52.84ms IncrementalHoareTripleChecker+Time [2021-11-13 18:53:00,174 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 45 Invalid, 16 Unknown, 0 Unchecked, 0.34ms Time], IncrementalHoareTripleChecker [2 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 52.84ms Time] [2021-11-13 18:53:00,175 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 331 states. [2021-11-13 18:53:00,206 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 331 to 331. [2021-11-13 18:53:00,207 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 331 states, 264 states have (on average 1.1401515151515151) internal successors, (301), 274 states have internal predecessors, (301), 39 states have call successors, (39), 29 states have call predecessors, (39), 27 states have return successors, (38), 27 states have call predecessors, (38), 38 states have call successors, (38) [2021-11-13 18:53:00,209 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 331 states to 331 states and 378 transitions. [2021-11-13 18:53:00,209 INFO L78 Accepts]: Start accepts. Automaton has 331 states and 378 transitions. Word has length 44 [2021-11-13 18:53:00,209 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:53:00,210 INFO L470 AbstractCegarLoop]: Abstraction has 331 states and 378 transitions. [2021-11-13 18:53:00,210 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 5.75) internal successors, (23), 4 states have internal predecessors, (23), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-13 18:53:00,210 INFO L276 IsEmpty]: Start isEmpty. Operand 331 states and 378 transitions. [2021-11-13 18:53:00,211 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-13 18:53:00,211 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:53:00,211 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1] [2021-11-13 18:53:00,226 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/mathsat -unsat_core_generation=3 (17)] Forceful destruction successful, exit code 0 [2021-11-13 18:53:00,423 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/mathsat -unsat_core_generation=3 [2021-11-13 18:53:00,423 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:53:00,423 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:53:00,423 INFO L85 PathProgramCache]: Analyzing trace with hash 2117996928, now seen corresponding path program 5 times [2021-11-13 18:53:00,424 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-11-13 18:53:00,424 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1944042928] [2021-11-13 18:53:00,424 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-13 18:53:00,424 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-13 18:53:00,424 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/mathsat [2021-11-13 18:53:00,425 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-13 18:53:00,434 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/mathsat -unsat_core_generation=3 (18)] Waiting until timeout for monitored process [2021-11-13 18:53:00,519 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-11-13 18:53:00,519 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 18:53:00,528 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-13 18:53:00,529 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:53:01,982 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 10 proven. 44 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-13 18:53:01,982 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 18:53:30,521 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 19 proven. 35 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-13 18:53:30,521 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-11-13 18:53:30,521 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1944042928] [2021-11-13 18:53:30,521 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1944042928] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 18:53:30,521 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-13 18:53:30,522 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 31 [2021-11-13 18:53:30,522 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [897861219] [2021-11-13 18:53:30,522 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-13 18:53:30,522 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-11-13 18:53:30,522 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-11-13 18:53:30,523 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-11-13 18:53:30,523 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=180, Invalid=750, Unknown=0, NotChecked=0, Total=930 [2021-11-13 18:53:30,523 INFO L87 Difference]: Start difference. First operand 331 states and 378 transitions. Second operand has 31 states, 31 states have (on average 2.193548387096774) internal successors, (68), 28 states have internal predecessors, (68), 8 states have call successors, (8), 3 states have call predecessors, (8), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-13 18:53:44,392 WARN L227 SmtUtils]: Spent 12.33s on a formula simplification. DAG size of input: 149 DAG size of output: 114 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-13 18:53:46,461 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.05s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-13 18:53:48,468 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-13 18:53:50,764 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-13 18:53:52,448 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.60s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-13 18:54:02,828 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.36s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-13 18:54:23,305 WARN L227 SmtUtils]: Spent 11.59s on a formula simplification. DAG size of input: 128 DAG size of output: 121 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-13 18:54:27,535 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-13 18:54:29,913 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-13 18:54:38,205 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-13 18:54:40,210 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-13 18:54:42,224 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-13 18:54:44,376 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-13 18:54:46,382 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-13 18:55:11,756 WARN L227 SmtUtils]: Spent 16.00s on a formula simplification. DAG size of input: 126 DAG size of output: 123 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-13 18:55:18,329 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-13 18:55:20,334 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-13 18:55:44,764 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-13 18:55:46,772 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-13 18:55:51,828 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-13 18:55:53,833 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-13 18:55:55,841 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-13 18:56:12,619 WARN L227 SmtUtils]: Spent 7.14s on a formula simplification. DAG size of input: 65 DAG size of output: 57 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-13 18:56:16,185 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.03s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-13 18:56:18,532 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-13 18:56:33,206 WARN L227 SmtUtils]: Spent 7.11s on a formula simplification. DAG size of input: 66 DAG size of output: 63 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-13 18:56:36,221 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-13 18:56:38,231 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-13 18:56:40,367 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-13 18:56:52,461 WARN L227 SmtUtils]: Spent 6.21s on a formula simplification that was a NOOP. DAG size: 150 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-13 18:56:55,784 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-13 18:56:57,797 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-13 18:57:20,645 WARN L227 SmtUtils]: Spent 13.16s on a formula simplification. DAG size of input: 151 DAG size of output: 119 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-13 18:57:38,791 WARN L227 SmtUtils]: Spent 12.15s on a formula simplification. DAG size of input: 142 DAG size of output: 104 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-13 18:57:41,043 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-13 18:57:43,049 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-13 18:57:45,059 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-13 18:57:47,073 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-13 18:57:49,079 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-13 18:57:51,086 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-13 18:58:09,800 WARN L227 SmtUtils]: Spent 12.92s on a formula simplification. DAG size of input: 148 DAG size of output: 113 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-13 18:58:31,563 WARN L227 SmtUtils]: Spent 15.07s on a formula simplification. DAG size of input: 126 DAG size of output: 123 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-13 18:58:33,606 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-13 18:58:35,612 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-13 18:58:36,814 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.01s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-13 18:59:30,270 WARN L227 SmtUtils]: Spent 39.65s on a formula simplification. DAG size of input: 86 DAG size of output: 86 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-13 18:59:33,754 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.05s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-13 18:59:35,761 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-13 19:00:31,790 WARN L227 SmtUtils]: Spent 40.04s on a formula simplification. DAG size of input: 87 DAG size of output: 84 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-13 19:00:33,824 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.03s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-13 19:00:34,964 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.14s for a HTC check with result INVALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-13 19:00:35,138 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 19:00:35,138 INFO L93 Difference]: Finished difference Result 443 states and 516 transitions. [2021-11-13 19:00:35,154 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-11-13 19:00:35,154 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 2.193548387096774) internal successors, (68), 28 states have internal predecessors, (68), 8 states have call successors, (8), 3 states have call predecessors, (8), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) Word has length 47 [2021-11-13 19:00:35,155 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 19:00:35,157 INFO L225 Difference]: With dead ends: 443 [2021-11-13 19:00:35,157 INFO L226 Difference]: Without dead ends: 440 [2021-11-13 19:00:35,159 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 66 SyntacticMatches, 2 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 585 ImplicationChecksByTransitivity, 340.6s TimeCoverageRelationStatistics Valid=607, Invalid=2565, Unknown=20, NotChecked=0, Total=3192 [2021-11-13 19:00:35,160 INFO L933 BasicCegarLoop]: 35 mSDtfsCounter, 267 mSDsluCounter, 494 mSDsCounter, 0 mSdLazyCounter, 658 mSolverCounterSat, 220 mSolverCounterUnsat, 35 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 100268.35ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 271 SdHoareTripleChecker+Valid, 529 SdHoareTripleChecker+Invalid, 913 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 8.27ms SdHoareTripleChecker+Time, 220 IncrementalHoareTripleChecker+Valid, 658 IncrementalHoareTripleChecker+Invalid, 35 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 101396.75ms IncrementalHoareTripleChecker+Time [2021-11-13 19:00:35,160 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [271 Valid, 529 Invalid, 913 Unknown, 0 Unchecked, 8.27ms Time], IncrementalHoareTripleChecker [220 Valid, 658 Invalid, 35 Unknown, 0 Unchecked, 101396.75ms Time] [2021-11-13 19:00:35,161 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 440 states. [2021-11-13 19:00:35,229 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 440 to 403. [2021-11-13 19:00:35,230 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 403 states, 319 states have (on average 1.141065830721003) internal successors, (364), 333 states have internal predecessors, (364), 51 states have call successors, (51), 33 states have call predecessors, (51), 32 states have return successors, (50), 36 states have call predecessors, (50), 50 states have call successors, (50) [2021-11-13 19:00:35,233 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 403 states to 403 states and 465 transitions. [2021-11-13 19:00:35,233 INFO L78 Accepts]: Start accepts. Automaton has 403 states and 465 transitions. Word has length 47 [2021-11-13 19:00:35,234 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 19:00:35,234 INFO L470 AbstractCegarLoop]: Abstraction has 403 states and 465 transitions. [2021-11-13 19:00:35,234 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 2.193548387096774) internal successors, (68), 28 states have internal predecessors, (68), 8 states have call successors, (8), 3 states have call predecessors, (8), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-13 19:00:35,234 INFO L276 IsEmpty]: Start isEmpty. Operand 403 states and 465 transitions. [2021-11-13 19:00:35,236 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-13 19:00:35,236 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 19:00:35,236 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1] [2021-11-13 19:00:35,251 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/mathsat -unsat_core_generation=3 (18)] Forceful destruction successful, exit code 0 [2021-11-13 19:00:35,448 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/mathsat -unsat_core_generation=3 [2021-11-13 19:00:35,448 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 19:00:35,449 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 19:00:35,449 INFO L85 PathProgramCache]: Analyzing trace with hash 1048248728, now seen corresponding path program 3 times [2021-11-13 19:00:35,449 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-11-13 19:00:35,449 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1651324822] [2021-11-13 19:00:35,449 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-13 19:00:35,449 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-13 19:00:35,450 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/mathsat [2021-11-13 19:00:35,450 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-13 19:00:35,452 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/mathsat -unsat_core_generation=3 (19)] Waiting until timeout for monitored process [2021-11-13 19:00:35,596 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-13 19:00:35,596 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 19:00:35,608 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 31 conjunts are in the unsatisfiable core [2021-11-13 19:00:35,609 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 19:00:37,112 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 10 proven. 56 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-13 19:00:37,112 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 19:01:18,574 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 28 proven. 35 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-13 19:01:18,574 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-11-13 19:01:18,574 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1651324822] [2021-11-13 19:01:18,575 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1651324822] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 19:01:18,575 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-13 19:01:18,575 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 32 [2021-11-13 19:01:18,578 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2090373829] [2021-11-13 19:01:18,578 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-13 19:01:18,578 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-13 19:01:18,578 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-11-13 19:01:18,579 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-13 19:01:18,579 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=205, Invalid=786, Unknown=1, NotChecked=0, Total=992 [2021-11-13 19:01:18,579 INFO L87 Difference]: Start difference. First operand 403 states and 465 transitions. Second operand has 32 states, 32 states have (on average 2.25) internal successors, (72), 29 states have internal predecessors, (72), 8 states have call successors, (8), 3 states have call predecessors, (8), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-13 19:01:27,252 WARN L227 SmtUtils]: Spent 7.21s on a formula simplification. DAG size of input: 132 DAG size of output: 97 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-13 19:01:31,053 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.03s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-13 19:01:33,206 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.56s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-13 19:01:53,565 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-13 19:01:58,757 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-13 19:02:04,462 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-13 19:02:05,945 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.48s for a HTC check with result INVALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-13 19:02:08,421 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-13 19:02:17,848 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.86s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-13 19:02:19,993 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-13 19:02:23,881 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-13 19:02:45,138 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-13 19:03:03,050 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-13 19:03:04,202 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.15s for a HTC check with result INVALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-13 19:03:06,915 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-13 19:03:09,475 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-13 19:03:18,535 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-13 19:03:29,355 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.16s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-13 19:03:36,363 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 19:03:36,364 INFO L93 Difference]: Finished difference Result 514 states and 593 transitions. [2021-11-13 19:03:36,369 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-11-13 19:03:36,369 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 2.25) internal successors, (72), 29 states have internal predecessors, (72), 8 states have call successors, (8), 3 states have call predecessors, (8), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) Word has length 50 [2021-11-13 19:03:36,370 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 19:03:36,373 INFO L225 Difference]: With dead ends: 514 [2021-11-13 19:03:36,374 INFO L226 Difference]: Without dead ends: 511 [2021-11-13 19:03:36,375 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 72 SyntacticMatches, 2 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 496 ImplicationChecksByTransitivity, 113.7s TimeCoverageRelationStatistics Valid=573, Invalid=1975, Unknown=2, NotChecked=0, Total=2550 [2021-11-13 19:03:36,376 INFO L933 BasicCegarLoop]: 37 mSDtfsCounter, 267 mSDsluCounter, 435 mSDsCounter, 0 mSdLazyCounter, 519 mSolverCounterSat, 207 mSolverCounterUnsat, 12 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 43162.30ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 271 SdHoareTripleChecker+Valid, 472 SdHoareTripleChecker+Invalid, 738 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 5.61ms SdHoareTripleChecker+Time, 207 IncrementalHoareTripleChecker+Valid, 519 IncrementalHoareTripleChecker+Invalid, 12 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 43897.20ms IncrementalHoareTripleChecker+Time [2021-11-13 19:03:36,376 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [271 Valid, 472 Invalid, 738 Unknown, 0 Unchecked, 5.61ms Time], IncrementalHoareTripleChecker [207 Valid, 519 Invalid, 12 Unknown, 0 Unchecked, 43897.20ms Time] [2021-11-13 19:03:36,378 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 511 states. [2021-11-13 19:03:36,468 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 511 to 449. [2021-11-13 19:03:36,470 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 449 states, 355 states have (on average 1.143661971830986) internal successors, (406), 368 states have internal predecessors, (406), 55 states have call successors, (55), 39 states have call predecessors, (55), 38 states have return successors, (54), 41 states have call predecessors, (54), 54 states have call successors, (54) [2021-11-13 19:03:36,472 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 449 states to 449 states and 515 transitions. [2021-11-13 19:03:36,472 INFO L78 Accepts]: Start accepts. Automaton has 449 states and 515 transitions. Word has length 50 [2021-11-13 19:03:36,473 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 19:03:36,473 INFO L470 AbstractCegarLoop]: Abstraction has 449 states and 515 transitions. [2021-11-13 19:03:36,473 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 2.25) internal successors, (72), 29 states have internal predecessors, (72), 8 states have call successors, (8), 3 states have call predecessors, (8), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-13 19:03:36,473 INFO L276 IsEmpty]: Start isEmpty. Operand 449 states and 515 transitions. [2021-11-13 19:03:36,475 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-11-13 19:03:36,475 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 19:03:36,475 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 5, 4, 4, 4, 4, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1] [2021-11-13 19:03:36,490 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/mathsat -unsat_core_generation=3 (19)] Ended with exit code 0 [2021-11-13 19:03:36,687 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/mathsat -unsat_core_generation=3 [2021-11-13 19:03:36,687 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 19:03:36,687 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 19:03:36,687 INFO L85 PathProgramCache]: Analyzing trace with hash 1027011010, now seen corresponding path program 4 times [2021-11-13 19:03:36,688 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-11-13 19:03:36,688 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [489695991] [2021-11-13 19:03:36,688 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-13 19:03:36,688 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-13 19:03:36,688 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/mathsat [2021-11-13 19:03:36,689 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-13 19:03:36,704 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_172c4900-3f1b-4b0b-887c-e59fc0d27fcc/bin/uautomizer-YU5uOKAj3y/mathsat -unsat_core_generation=3 (20)] Waiting until timeout for monitored process [2021-11-13 19:03:36,782 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-13 19:03:36,783 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 19:03:36,792 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-13 19:03:36,794 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 19:03:38,438 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 10 proven. 71 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-13 19:03:38,438 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 19:04:39,546 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 37 proven. 35 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-13 19:04:39,546 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-11-13 19:04:39,546 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [489695991] [2021-11-13 19:04:39,546 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [489695991] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 19:04:39,546 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-13 19:04:39,546 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 17] total 33 [2021-11-13 19:04:39,546 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1395361874] [2021-11-13 19:04:39,546 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-13 19:04:39,547 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2021-11-13 19:04:39,547 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-11-13 19:04:39,547 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-11-13 19:04:39,548 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=231, Invalid=824, Unknown=1, NotChecked=0, Total=1056 [2021-11-13 19:04:39,548 INFO L87 Difference]: Start difference. First operand 449 states and 515 transitions. Second operand has 33 states, 33 states have (on average 2.272727272727273) internal successors, (75), 30 states have internal predecessors, (75), 8 states have call successors, (8), 3 states have call predecessors, (8), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6)