./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-examples/relax-2-2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 38b53e6a Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/config/AutomizerReach.xml -i ../../sv-benchmarks/c/array-examples/relax-2-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R --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 56e9aa9f750ced23bf75100b2ff89e86c96f8abe4883dfab569153879bc59aef --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-38b53e6 [2022-11-25 17:52:20,425 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-25 17:52:20,427 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-25 17:52:20,450 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-25 17:52:20,451 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-25 17:52:20,452 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-25 17:52:20,453 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-25 17:52:20,455 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-25 17:52:20,457 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-25 17:52:20,459 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-25 17:52:20,460 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-25 17:52:20,461 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-25 17:52:20,461 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-25 17:52:20,463 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-25 17:52:20,464 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-25 17:52:20,465 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-25 17:52:20,466 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-25 17:52:20,467 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-25 17:52:20,469 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-25 17:52:20,471 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-25 17:52:20,473 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-25 17:52:20,477 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-25 17:52:20,478 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-25 17:52:20,479 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-25 17:52:20,483 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-25 17:52:20,484 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-25 17:52:20,484 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-25 17:52:20,485 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-25 17:52:20,486 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-25 17:52:20,497 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-25 17:52:20,497 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-25 17:52:20,498 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-25 17:52:20,499 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-25 17:52:20,500 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-25 17:52:20,501 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-25 17:52:20,501 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-25 17:52:20,502 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-25 17:52:20,502 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-25 17:52:20,503 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-25 17:52:20,504 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-25 17:52:20,505 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-25 17:52:20,509 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/config/svcomp-Reach-32bit-Automizer_Default.epf [2022-11-25 17:52:20,564 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-25 17:52:20,564 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-25 17:52:20,565 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-25 17:52:20,566 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-25 17:52:20,567 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-25 17:52:20,567 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-25 17:52:20,568 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-11-25 17:52:20,568 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-11-25 17:52:20,569 INFO L138 SettingsManager]: * Use SBE=true [2022-11-25 17:52:20,569 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-25 17:52:20,571 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-25 17:52:20,571 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-25 17:52:20,571 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-25 17:52:20,572 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-25 17:52:20,572 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-25 17:52:20,572 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-25 17:52:20,573 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-25 17:52:20,573 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-25 17:52:20,573 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-25 17:52:20,574 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-25 17:52:20,574 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-25 17:52:20,574 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-25 17:52:20,575 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-11-25 17:52:20,575 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-25 17:52:20,575 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-25 17:52:20,576 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-25 17:52:20,576 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-25 17:52:20,576 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-25 17:52:20,577 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2022-11-25 17:52:20,578 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-25 17:52:20,578 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2022-11-25 17:52:20,578 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-25 17:52:20,579 INFO L138 SettingsManager]: * Order on configurations for Petri net unfoldings=DBO [2022-11-25 17:52:20,579 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2022-11-25 17:52:20,579 INFO L138 SettingsManager]: * Looper check in Petri net analysis=SEMANTIC 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_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 56e9aa9f750ced23bf75100b2ff89e86c96f8abe4883dfab569153879bc59aef [2022-11-25 17:52:20,900 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-25 17:52:20,933 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-25 17:52:20,937 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-25 17:52:20,939 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-25 17:52:20,939 INFO L275 PluginConnector]: CDTParser initialized [2022-11-25 17:52:20,941 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/../../sv-benchmarks/c/array-examples/relax-2-2.i [2022-11-25 17:52:24,090 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-11-25 17:52:24,331 INFO L351 CDTParser]: Found 1 translation units. [2022-11-25 17:52:24,332 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/sv-benchmarks/c/array-examples/relax-2-2.i [2022-11-25 17:52:24,346 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/data/aef3d03c1/c110ea35435d42d5b898c858eea08b4c/FLAG21fab6ae6 [2022-11-25 17:52:24,362 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/data/aef3d03c1/c110ea35435d42d5b898c858eea08b4c [2022-11-25 17:52:24,364 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-25 17:52:24,366 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-25 17:52:24,373 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-25 17:52:24,373 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-25 17:52:24,377 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-25 17:52:24,378 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 05:52:24" (1/1) ... [2022-11-25 17:52:24,379 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7ce3b761 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:52:24, skipping insertion in model container [2022-11-25 17:52:24,379 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 05:52:24" (1/1) ... [2022-11-25 17:52:24,393 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-25 17:52:24,465 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-25 17:52:24,645 WARN L237 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_bd39426e-4557-42e1-ad96-158c2098d1cb/sv-benchmarks/c/array-examples/relax-2-2.i[982,995] [2022-11-25 17:52:24,826 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-25 17:52:24,837 INFO L203 MainTranslator]: Completed pre-run [2022-11-25 17:52:24,856 WARN L237 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_bd39426e-4557-42e1-ad96-158c2098d1cb/sv-benchmarks/c/array-examples/relax-2-2.i[982,995] [2022-11-25 17:52:24,913 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-25 17:52:24,939 INFO L208 MainTranslator]: Completed translation [2022-11-25 17:52:24,940 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:52:24 WrapperNode [2022-11-25 17:52:24,940 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-25 17:52:24,941 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-25 17:52:24,941 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-25 17:52:24,942 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-25 17:52:24,951 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:52:24" (1/1) ... [2022-11-25 17:52:24,965 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:52:24" (1/1) ... [2022-11-25 17:52:24,990 INFO L138 Inliner]: procedures = 120, calls = 28, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 137 [2022-11-25 17:52:24,990 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-25 17:52:24,991 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-25 17:52:24,991 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-25 17:52:24,991 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-25 17:52:25,001 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:52:24" (1/1) ... [2022-11-25 17:52:25,001 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:52:24" (1/1) ... [2022-11-25 17:52:25,005 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:52:24" (1/1) ... [2022-11-25 17:52:25,005 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:52:24" (1/1) ... [2022-11-25 17:52:25,013 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:52:24" (1/1) ... [2022-11-25 17:52:25,023 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:52:24" (1/1) ... [2022-11-25 17:52:25,030 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:52:24" (1/1) ... [2022-11-25 17:52:25,041 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:52:24" (1/1) ... [2022-11-25 17:52:25,044 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-25 17:52:25,045 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-25 17:52:25,045 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-25 17:52:25,045 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-25 17:52:25,046 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:52:24" (1/1) ... [2022-11-25 17:52:25,062 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-25 17:52:25,092 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 [2022-11-25 17:52:25,109 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-25 17:52:25,124 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-25 17:52:25,183 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-11-25 17:52:25,184 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-11-25 17:52:25,184 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-11-25 17:52:25,184 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-11-25 17:52:25,184 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-11-25 17:52:25,185 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-11-25 17:52:25,185 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2022-11-25 17:52:25,186 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-25 17:52:25,186 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-25 17:52:25,186 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-25 17:52:25,186 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-25 17:52:25,303 INFO L235 CfgBuilder]: Building ICFG [2022-11-25 17:52:25,310 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-25 17:52:25,706 INFO L276 CfgBuilder]: Performing block encoding [2022-11-25 17:52:25,713 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-25 17:52:25,714 INFO L300 CfgBuilder]: Removed 5 assume(true) statements. [2022-11-25 17:52:25,716 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 05:52:25 BoogieIcfgContainer [2022-11-25 17:52:25,716 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-25 17:52:25,718 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-25 17:52:25,718 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-25 17:52:25,721 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-25 17:52:25,722 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 05:52:24" (1/3) ... [2022-11-25 17:52:25,722 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7263893c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 05:52:25, skipping insertion in model container [2022-11-25 17:52:25,723 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:52:24" (2/3) ... [2022-11-25 17:52:25,723 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7263893c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 05:52:25, skipping insertion in model container [2022-11-25 17:52:25,723 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 05:52:25" (3/3) ... [2022-11-25 17:52:25,724 INFO L112 eAbstractionObserver]: Analyzing ICFG relax-2-2.i [2022-11-25 17:52:25,745 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-25 17:52:25,745 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-25 17:52:25,800 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-25 17:52:25,809 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@494b6816, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-25 17:52:25,810 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-25 17:52:25,814 INFO L276 IsEmpty]: Start isEmpty. Operand has 54 states, 43 states have (on average 1.5813953488372092) internal successors, (68), 45 states have internal predecessors, (68), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2022-11-25 17:52:25,823 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-11-25 17:52:25,823 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 17:52:25,823 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 17:52:25,824 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 17:52:25,830 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 17:52:25,830 INFO L85 PathProgramCache]: Analyzing trace with hash 424197970, now seen corresponding path program 1 times [2022-11-25 17:52:25,841 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-25 17:52:25,841 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [313067575] [2022-11-25 17:52:25,842 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 17:52:25,842 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 17:52:25,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:52:26,083 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-11-25 17:52:26,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:52:26,093 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-11-25 17:52:26,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:52:26,102 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-25 17:52:26,102 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-25 17:52:26,103 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [313067575] [2022-11-25 17:52:26,103 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [313067575] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 17:52:26,104 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-25 17:52:26,104 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-25 17:52:26,106 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [912221933] [2022-11-25 17:52:26,107 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 17:52:26,111 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2022-11-25 17:52:26,112 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-25 17:52:26,143 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2022-11-25 17:52:26,144 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-11-25 17:52:26,146 INFO L87 Difference]: Start difference. First operand has 54 states, 43 states have (on average 1.5813953488372092) internal successors, (68), 45 states have internal predecessors, (68), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) Second operand has 2 states, 2 states have (on average 8.0) internal successors, (16), 2 states have internal predecessors, (16), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-25 17:52:26,185 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 17:52:26,185 INFO L93 Difference]: Finished difference Result 105 states and 167 transitions. [2022-11-25 17:52:26,189 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2022-11-25 17:52:26,190 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 8.0) internal successors, (16), 2 states have internal predecessors, (16), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 24 [2022-11-25 17:52:26,191 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 17:52:26,198 INFO L225 Difference]: With dead ends: 105 [2022-11-25 17:52:26,199 INFO L226 Difference]: Without dead ends: 50 [2022-11-25 17:52:26,202 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-11-25 17:52:26,209 INFO L413 NwaCegarLoop]: 75 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 0 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 75 SdHoareTripleChecker+Invalid, 0 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 0 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-25 17:52:26,210 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 75 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-25 17:52:26,226 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2022-11-25 17:52:26,246 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2022-11-25 17:52:26,247 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 40 states have (on average 1.4) internal successors, (56), 41 states have internal predecessors, (56), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-11-25 17:52:26,249 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 69 transitions. [2022-11-25 17:52:26,251 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 69 transitions. Word has length 24 [2022-11-25 17:52:26,251 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 17:52:26,251 INFO L495 AbstractCegarLoop]: Abstraction has 50 states and 69 transitions. [2022-11-25 17:52:26,252 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 8.0) internal successors, (16), 2 states have internal predecessors, (16), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-25 17:52:26,252 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 69 transitions. [2022-11-25 17:52:26,253 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-11-25 17:52:26,253 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 17:52:26,253 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 17:52:26,254 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-25 17:52:26,254 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 17:52:26,255 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 17:52:26,255 INFO L85 PathProgramCache]: Analyzing trace with hash 518459404, now seen corresponding path program 1 times [2022-11-25 17:52:26,255 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-25 17:52:26,255 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [141735222] [2022-11-25 17:52:26,255 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 17:52:26,256 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 17:52:26,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:52:26,521 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-11-25 17:52:26,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:52:26,530 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-11-25 17:52:26,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:52:26,546 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-25 17:52:26,553 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-25 17:52:26,553 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [141735222] [2022-11-25 17:52:26,554 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [141735222] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 17:52:26,554 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-25 17:52:26,554 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-25 17:52:26,555 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1334846637] [2022-11-25 17:52:26,555 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 17:52:26,557 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-25 17:52:26,557 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-25 17:52:26,558 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-25 17:52:26,559 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-25 17:52:26,560 INFO L87 Difference]: Start difference. First operand 50 states and 69 transitions. Second operand has 4 states, 4 states have (on average 4.0) internal successors, (16), 4 states have internal predecessors, (16), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-25 17:52:26,628 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 17:52:26,628 INFO L93 Difference]: Finished difference Result 83 states and 112 transitions. [2022-11-25 17:52:26,633 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-25 17:52:26,634 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.0) internal successors, (16), 4 states have internal predecessors, (16), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 24 [2022-11-25 17:52:26,635 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 17:52:26,636 INFO L225 Difference]: With dead ends: 83 [2022-11-25 17:52:26,636 INFO L226 Difference]: Without dead ends: 58 [2022-11-25 17:52:26,637 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-11-25 17:52:26,638 INFO L413 NwaCegarLoop]: 67 mSDtfsCounter, 10 mSDsluCounter, 128 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 195 SdHoareTripleChecker+Invalid, 11 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 9 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-25 17:52:26,638 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 195 Invalid, 11 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 9 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-25 17:52:26,639 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2022-11-25 17:52:26,646 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 52. [2022-11-25 17:52:26,646 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 42 states have (on average 1.380952380952381) internal successors, (58), 43 states have internal predecessors, (58), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-11-25 17:52:26,648 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 71 transitions. [2022-11-25 17:52:26,648 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 71 transitions. Word has length 24 [2022-11-25 17:52:26,650 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 17:52:26,650 INFO L495 AbstractCegarLoop]: Abstraction has 52 states and 71 transitions. [2022-11-25 17:52:26,651 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 4.0) internal successors, (16), 4 states have internal predecessors, (16), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-25 17:52:26,651 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 71 transitions. [2022-11-25 17:52:26,652 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-11-25 17:52:26,652 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 17:52:26,652 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 17:52:26,652 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-11-25 17:52:26,653 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 17:52:26,653 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 17:52:26,654 INFO L85 PathProgramCache]: Analyzing trace with hash 1090015461, now seen corresponding path program 1 times [2022-11-25 17:52:26,654 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-25 17:52:26,654 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [549659235] [2022-11-25 17:52:26,655 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 17:52:26,655 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 17:52:26,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:52:26,977 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-11-25 17:52:26,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:52:26,982 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-11-25 17:52:26,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:52:26,987 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-25 17:52:26,988 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-25 17:52:26,988 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [549659235] [2022-11-25 17:52:26,988 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [549659235] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 17:52:26,989 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-25 17:52:26,989 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-11-25 17:52:26,989 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [90547346] [2022-11-25 17:52:26,989 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 17:52:26,990 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-25 17:52:26,990 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-25 17:52:26,991 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-25 17:52:26,991 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-25 17:52:26,991 INFO L87 Difference]: Start difference. First operand 52 states and 71 transitions. Second operand has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-25 17:52:27,123 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 17:52:27,127 INFO L93 Difference]: Finished difference Result 108 states and 146 transitions. [2022-11-25 17:52:27,128 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-25 17:52:27,129 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 26 [2022-11-25 17:52:27,131 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 17:52:27,132 INFO L225 Difference]: With dead ends: 108 [2022-11-25 17:52:27,132 INFO L226 Difference]: Without dead ends: 72 [2022-11-25 17:52:27,133 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2022-11-25 17:52:27,134 INFO L413 NwaCegarLoop]: 59 mSDtfsCounter, 50 mSDsluCounter, 225 mSDsCounter, 0 mSdLazyCounter, 61 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 284 SdHoareTripleChecker+Invalid, 68 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 61 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 17:52:27,135 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [50 Valid, 284 Invalid, 68 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 61 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 17:52:27,136 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2022-11-25 17:52:27,159 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 68. [2022-11-25 17:52:27,161 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 58 states have (on average 1.396551724137931) internal successors, (81), 59 states have internal predecessors, (81), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-11-25 17:52:27,165 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 94 transitions. [2022-11-25 17:52:27,166 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 94 transitions. Word has length 26 [2022-11-25 17:52:27,166 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 17:52:27,166 INFO L495 AbstractCegarLoop]: Abstraction has 68 states and 94 transitions. [2022-11-25 17:52:27,167 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-25 17:52:27,167 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 94 transitions. [2022-11-25 17:52:27,168 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-11-25 17:52:27,168 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 17:52:27,169 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 17:52:27,169 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-11-25 17:52:27,169 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 17:52:27,170 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 17:52:27,170 INFO L85 PathProgramCache]: Analyzing trace with hash -1637522002, now seen corresponding path program 1 times [2022-11-25 17:52:27,170 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-25 17:52:27,172 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1125618199] [2022-11-25 17:52:27,172 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 17:52:27,172 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 17:52:27,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:52:27,822 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-11-25 17:52:27,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:52:27,833 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-11-25 17:52:27,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:52:27,841 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-25 17:52:27,841 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-25 17:52:27,842 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1125618199] [2022-11-25 17:52:27,842 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1125618199] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 17:52:27,842 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-25 17:52:27,843 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-11-25 17:52:27,843 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1498380828] [2022-11-25 17:52:27,843 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 17:52:27,844 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-25 17:52:27,845 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-25 17:52:27,846 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-25 17:52:27,846 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2022-11-25 17:52:27,847 INFO L87 Difference]: Start difference. First operand 68 states and 94 transitions. Second operand has 7 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 7 states have internal predecessors, (19), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-25 17:52:28,195 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 17:52:28,196 INFO L93 Difference]: Finished difference Result 110 states and 147 transitions. [2022-11-25 17:52:28,197 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-11-25 17:52:28,197 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 7 states have internal predecessors, (19), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 27 [2022-11-25 17:52:28,198 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 17:52:28,199 INFO L225 Difference]: With dead ends: 110 [2022-11-25 17:52:28,201 INFO L226 Difference]: Without dead ends: 98 [2022-11-25 17:52:28,201 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2022-11-25 17:52:28,203 INFO L413 NwaCegarLoop]: 72 mSDtfsCounter, 120 mSDsluCounter, 278 mSDsCounter, 0 mSdLazyCounter, 105 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 123 SdHoareTripleChecker+Valid, 350 SdHoareTripleChecker+Invalid, 108 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 105 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-25 17:52:28,206 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [123 Valid, 350 Invalid, 108 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 105 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-25 17:52:28,208 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2022-11-25 17:52:28,222 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 76. [2022-11-25 17:52:28,226 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 66 states have (on average 1.4090909090909092) internal successors, (93), 67 states have internal predecessors, (93), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-11-25 17:52:28,232 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 106 transitions. [2022-11-25 17:52:28,232 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 106 transitions. Word has length 27 [2022-11-25 17:52:28,233 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 17:52:28,233 INFO L495 AbstractCegarLoop]: Abstraction has 76 states and 106 transitions. [2022-11-25 17:52:28,233 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 7 states have internal predecessors, (19), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-25 17:52:28,233 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 106 transitions. [2022-11-25 17:52:28,234 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-11-25 17:52:28,234 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 17:52:28,234 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 17:52:28,235 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-11-25 17:52:28,235 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 17:52:28,235 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 17:52:28,235 INFO L85 PathProgramCache]: Analyzing trace with hash -703814141, now seen corresponding path program 1 times [2022-11-25 17:52:28,236 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-25 17:52:28,236 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1166092088] [2022-11-25 17:52:28,236 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 17:52:28,236 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 17:52:28,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:52:28,749 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-11-25 17:52:28,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:52:28,753 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-11-25 17:52:28,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:52:28,757 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-25 17:52:28,757 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-25 17:52:28,758 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1166092088] [2022-11-25 17:52:28,758 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1166092088] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 17:52:28,758 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [138372845] [2022-11-25 17:52:28,758 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 17:52:28,759 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 17:52:28,759 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 [2022-11-25 17:52:28,764 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 17:52:28,797 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-25 17:52:28,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:52:28,875 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 17 conjunts are in the unsatisfiable core [2022-11-25 17:52:28,881 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 17:52:29,140 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-11-25 17:52:29,140 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-25 17:52:29,141 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [138372845] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 17:52:29,141 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-25 17:52:29,141 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [9] total 12 [2022-11-25 17:52:29,141 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [194979621] [2022-11-25 17:52:29,142 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 17:52:29,142 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-25 17:52:29,142 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-25 17:52:29,143 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-25 17:52:29,147 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=106, Unknown=0, NotChecked=0, Total=132 [2022-11-25 17:52:29,147 INFO L87 Difference]: Start difference. First operand 76 states and 106 transitions. Second operand has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 5 states have internal predecessors, (20), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-25 17:52:29,309 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 17:52:29,309 INFO L93 Difference]: Finished difference Result 88 states and 117 transitions. [2022-11-25 17:52:29,310 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-25 17:52:29,310 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 5 states have internal predecessors, (20), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 28 [2022-11-25 17:52:29,311 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 17:52:29,315 INFO L225 Difference]: With dead ends: 88 [2022-11-25 17:52:29,315 INFO L226 Difference]: Without dead ends: 86 [2022-11-25 17:52:29,316 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 32 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2022-11-25 17:52:29,318 INFO L413 NwaCegarLoop]: 52 mSDtfsCounter, 76 mSDsluCounter, 134 mSDsCounter, 0 mSdLazyCounter, 78 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 76 SdHoareTripleChecker+Valid, 186 SdHoareTripleChecker+Invalid, 87 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 78 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 17:52:29,318 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [76 Valid, 186 Invalid, 87 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 78 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 17:52:29,320 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2022-11-25 17:52:29,355 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 80. [2022-11-25 17:52:29,356 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 69 states have (on average 1.391304347826087) internal successors, (96), 70 states have internal predecessors, (96), 7 states have call successors, (7), 3 states have call predecessors, (7), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-11-25 17:52:29,359 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 109 transitions. [2022-11-25 17:52:29,360 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 109 transitions. Word has length 28 [2022-11-25 17:52:29,360 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 17:52:29,360 INFO L495 AbstractCegarLoop]: Abstraction has 80 states and 109 transitions. [2022-11-25 17:52:29,361 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 5 states have internal predecessors, (20), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-25 17:52:29,361 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 109 transitions. [2022-11-25 17:52:29,365 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-11-25 17:52:29,366 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 17:52:29,366 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 17:52:29,378 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-25 17:52:29,572 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 17:52:29,573 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 17:52:29,573 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 17:52:29,573 INFO L85 PathProgramCache]: Analyzing trace with hash 338610741, now seen corresponding path program 1 times [2022-11-25 17:52:29,574 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-25 17:52:29,574 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2074876882] [2022-11-25 17:52:29,574 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 17:52:29,574 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 17:52:29,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:52:29,715 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-11-25 17:52:29,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:52:29,719 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-11-25 17:52:29,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:52:29,722 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-25 17:52:29,723 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-25 17:52:29,723 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2074876882] [2022-11-25 17:52:29,723 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2074876882] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 17:52:29,723 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-25 17:52:29,724 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-25 17:52:29,724 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1692349541] [2022-11-25 17:52:29,724 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 17:52:29,724 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-25 17:52:29,724 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-25 17:52:29,725 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-25 17:52:29,725 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-25 17:52:29,725 INFO L87 Difference]: Start difference. First operand 80 states and 109 transitions. Second operand has 4 states, 4 states have (on average 5.25) internal successors, (21), 4 states have internal predecessors, (21), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-25 17:52:29,768 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 17:52:29,768 INFO L93 Difference]: Finished difference Result 97 states and 128 transitions. [2022-11-25 17:52:29,768 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-25 17:52:29,770 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 5.25) internal successors, (21), 4 states have internal predecessors, (21), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 29 [2022-11-25 17:52:29,770 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 17:52:29,771 INFO L225 Difference]: With dead ends: 97 [2022-11-25 17:52:29,771 INFO L226 Difference]: Without dead ends: 79 [2022-11-25 17:52:29,772 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-11-25 17:52:29,782 INFO L413 NwaCegarLoop]: 67 mSDtfsCounter, 17 mSDsluCounter, 108 mSDsCounter, 0 mSdLazyCounter, 11 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 175 SdHoareTripleChecker+Invalid, 11 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 11 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-25 17:52:29,782 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [21 Valid, 175 Invalid, 11 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 11 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-25 17:52:29,784 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2022-11-25 17:52:29,804 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2022-11-25 17:52:29,805 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 68 states have (on average 1.3529411764705883) internal successors, (92), 69 states have internal predecessors, (92), 7 states have call successors, (7), 3 states have call predecessors, (7), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-11-25 17:52:29,806 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 105 transitions. [2022-11-25 17:52:29,807 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 105 transitions. Word has length 29 [2022-11-25 17:52:29,809 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 17:52:29,809 INFO L495 AbstractCegarLoop]: Abstraction has 79 states and 105 transitions. [2022-11-25 17:52:29,809 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 5.25) internal successors, (21), 4 states have internal predecessors, (21), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-25 17:52:29,809 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 105 transitions. [2022-11-25 17:52:29,814 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-11-25 17:52:29,814 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 17:52:29,814 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 17:52:29,815 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2022-11-25 17:52:29,815 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 17:52:29,815 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 17:52:29,815 INFO L85 PathProgramCache]: Analyzing trace with hash -1088390000, now seen corresponding path program 1 times [2022-11-25 17:52:29,816 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-25 17:52:29,816 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [555281638] [2022-11-25 17:52:29,816 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 17:52:29,816 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 17:52:29,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:52:30,023 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-11-25 17:52:30,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:52:30,039 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-11-25 17:52:30,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:52:30,043 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-11-25 17:52:30,045 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-25 17:52:30,045 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [555281638] [2022-11-25 17:52:30,045 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [555281638] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 17:52:30,046 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-25 17:52:30,046 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-25 17:52:30,046 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [381915394] [2022-11-25 17:52:30,046 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 17:52:30,047 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-25 17:52:30,047 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-25 17:52:30,048 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-25 17:52:30,048 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-11-25 17:52:30,049 INFO L87 Difference]: Start difference. First operand 79 states and 105 transitions. Second operand has 5 states, 5 states have (on average 4.2) internal successors, (21), 5 states have internal predecessors, (21), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-25 17:52:30,157 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 17:52:30,157 INFO L93 Difference]: Finished difference Result 90 states and 116 transitions. [2022-11-25 17:52:30,158 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-25 17:52:30,158 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.2) internal successors, (21), 5 states have internal predecessors, (21), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 29 [2022-11-25 17:52:30,158 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 17:52:30,159 INFO L225 Difference]: With dead ends: 90 [2022-11-25 17:52:30,159 INFO L226 Difference]: Without dead ends: 58 [2022-11-25 17:52:30,160 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2022-11-25 17:52:30,160 INFO L413 NwaCegarLoop]: 63 mSDtfsCounter, 11 mSDsluCounter, 164 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 227 SdHoareTripleChecker+Invalid, 50 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 17:52:30,161 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 227 Invalid, 50 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 48 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 17:52:30,162 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2022-11-25 17:52:30,170 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2022-11-25 17:52:30,172 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 46 states have (on average 1.326086956521739) internal successors, (61), 47 states have internal predecessors, (61), 7 states have call successors, (7), 3 states have call predecessors, (7), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-11-25 17:52:30,173 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 74 transitions. [2022-11-25 17:52:30,173 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 74 transitions. Word has length 29 [2022-11-25 17:52:30,173 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 17:52:30,173 INFO L495 AbstractCegarLoop]: Abstraction has 57 states and 74 transitions. [2022-11-25 17:52:30,174 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 4.2) internal successors, (21), 5 states have internal predecessors, (21), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-25 17:52:30,176 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 74 transitions. [2022-11-25 17:52:30,177 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-11-25 17:52:30,178 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 17:52:30,178 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 17:52:30,178 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2022-11-25 17:52:30,179 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 17:52:30,179 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 17:52:30,179 INFO L85 PathProgramCache]: Analyzing trace with hash -1413511858, now seen corresponding path program 1 times [2022-11-25 17:52:30,179 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-25 17:52:30,180 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1515624130] [2022-11-25 17:52:30,180 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 17:52:30,180 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 17:52:30,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:52:30,579 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-11-25 17:52:30,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:52:30,582 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-11-25 17:52:30,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:52:30,586 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-25 17:52:30,586 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-25 17:52:30,586 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1515624130] [2022-11-25 17:52:30,586 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1515624130] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 17:52:30,587 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1835288306] [2022-11-25 17:52:30,587 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 17:52:30,587 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 17:52:30,587 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 [2022-11-25 17:52:30,588 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 17:52:30,615 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-25 17:52:30,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:52:30,687 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 10 conjunts are in the unsatisfiable core [2022-11-25 17:52:30,691 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 17:52:30,747 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-11-25 17:52:30,747 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-25 17:52:30,748 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1835288306] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 17:52:30,748 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-25 17:52:30,748 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [9] total 11 [2022-11-25 17:52:30,748 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [667092142] [2022-11-25 17:52:30,748 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 17:52:30,749 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-25 17:52:30,749 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-25 17:52:30,749 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-25 17:52:30,749 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2022-11-25 17:52:30,750 INFO L87 Difference]: Start difference. First operand 57 states and 74 transitions. Second operand has 4 states, 4 states have (on average 5.25) internal successors, (21), 4 states have internal predecessors, (21), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-25 17:52:30,849 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 17:52:30,849 INFO L93 Difference]: Finished difference Result 71 states and 90 transitions. [2022-11-25 17:52:30,850 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-25 17:52:30,850 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 5.25) internal successors, (21), 4 states have internal predecessors, (21), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 29 [2022-11-25 17:52:30,850 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 17:52:30,851 INFO L225 Difference]: With dead ends: 71 [2022-11-25 17:52:30,851 INFO L226 Difference]: Without dead ends: 57 [2022-11-25 17:52:30,851 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2022-11-25 17:52:30,852 INFO L413 NwaCegarLoop]: 55 mSDtfsCounter, 39 mSDsluCounter, 59 mSDsCounter, 0 mSdLazyCounter, 50 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 114 SdHoareTripleChecker+Invalid, 50 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 50 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 17:52:30,853 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [43 Valid, 114 Invalid, 50 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 50 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 17:52:30,853 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2022-11-25 17:52:30,860 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2022-11-25 17:52:30,861 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 46 states have (on average 1.3043478260869565) internal successors, (60), 47 states have internal predecessors, (60), 7 states have call successors, (7), 3 states have call predecessors, (7), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-11-25 17:52:30,861 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 73 transitions. [2022-11-25 17:52:30,862 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 73 transitions. Word has length 29 [2022-11-25 17:52:30,862 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 17:52:30,862 INFO L495 AbstractCegarLoop]: Abstraction has 57 states and 73 transitions. [2022-11-25 17:52:30,862 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 5.25) internal successors, (21), 4 states have internal predecessors, (21), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-25 17:52:30,862 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 73 transitions. [2022-11-25 17:52:30,863 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-11-25 17:52:30,863 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 17:52:30,863 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 17:52:30,874 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-25 17:52:31,063 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 17:52:31,064 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 17:52:31,064 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 17:52:31,064 INFO L85 PathProgramCache]: Analyzing trace with hash -1264785641, now seen corresponding path program 1 times [2022-11-25 17:52:31,064 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-25 17:52:31,065 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1632814410] [2022-11-25 17:52:31,065 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 17:52:31,065 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 17:52:31,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:52:31,106 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-11-25 17:52:31,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:52:31,109 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-11-25 17:52:31,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:52:31,113 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-11-25 17:52:31,113 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-25 17:52:31,113 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1632814410] [2022-11-25 17:52:31,113 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1632814410] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 17:52:31,113 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-25 17:52:31,113 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-25 17:52:31,114 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1926422788] [2022-11-25 17:52:31,114 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 17:52:31,114 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-25 17:52:31,114 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-25 17:52:31,115 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-25 17:52:31,115 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-25 17:52:31,115 INFO L87 Difference]: Start difference. First operand 57 states and 73 transitions. Second operand has 3 states, 3 states have (on average 7.666666666666667) internal successors, (23), 3 states have internal predecessors, (23), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-25 17:52:31,144 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 17:52:31,144 INFO L93 Difference]: Finished difference Result 93 states and 123 transitions. [2022-11-25 17:52:31,144 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-25 17:52:31,145 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 7.666666666666667) internal successors, (23), 3 states have internal predecessors, (23), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 31 [2022-11-25 17:52:31,145 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 17:52:31,146 INFO L225 Difference]: With dead ends: 93 [2022-11-25 17:52:31,146 INFO L226 Difference]: Without dead ends: 79 [2022-11-25 17:52:31,146 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-25 17:52:31,149 INFO L413 NwaCegarLoop]: 69 mSDtfsCounter, 22 mSDsluCounter, 61 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 130 SdHoareTripleChecker+Invalid, 10 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 9 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-25 17:52:31,150 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [26 Valid, 130 Invalid, 10 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 9 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-25 17:52:31,150 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2022-11-25 17:52:31,181 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 62. [2022-11-25 17:52:31,181 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 51 states have (on average 1.3137254901960784) internal successors, (67), 52 states have internal predecessors, (67), 7 states have call successors, (7), 3 states have call predecessors, (7), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-11-25 17:52:31,183 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 80 transitions. [2022-11-25 17:52:31,183 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 80 transitions. Word has length 31 [2022-11-25 17:52:31,183 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 17:52:31,183 INFO L495 AbstractCegarLoop]: Abstraction has 62 states and 80 transitions. [2022-11-25 17:52:31,184 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 7.666666666666667) internal successors, (23), 3 states have internal predecessors, (23), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-25 17:52:31,184 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 80 transitions. [2022-11-25 17:52:31,185 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-11-25 17:52:31,186 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 17:52:31,186 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 17:52:31,186 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2022-11-25 17:52:31,186 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 17:52:31,187 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 17:52:31,187 INFO L85 PathProgramCache]: Analyzing trace with hash -1196949427, now seen corresponding path program 1 times [2022-11-25 17:52:31,187 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-25 17:52:31,188 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [90011548] [2022-11-25 17:52:31,188 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 17:52:31,188 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 17:52:31,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:52:31,520 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-11-25 17:52:31,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:52:31,525 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-11-25 17:52:31,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:52:31,529 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-11-25 17:52:31,529 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-25 17:52:31,529 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [90011548] [2022-11-25 17:52:31,529 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [90011548] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 17:52:31,530 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [329205350] [2022-11-25 17:52:31,530 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 17:52:31,530 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 17:52:31,530 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 [2022-11-25 17:52:31,532 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 17:52:31,555 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-25 17:52:31,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:52:31,632 INFO L263 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-25 17:52:31,634 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 17:52:31,702 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-11-25 17:52:31,702 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-25 17:52:31,703 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [329205350] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 17:52:31,703 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-25 17:52:31,703 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [8] total 10 [2022-11-25 17:52:31,703 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1555102998] [2022-11-25 17:52:31,704 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 17:52:31,704 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-25 17:52:31,704 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-25 17:52:31,705 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-25 17:52:31,705 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2022-11-25 17:52:31,705 INFO L87 Difference]: Start difference. First operand 62 states and 80 transitions. Second operand has 6 states, 6 states have (on average 4.5) internal successors, (27), 6 states have internal predecessors, (27), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-25 17:52:31,839 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 17:52:31,839 INFO L93 Difference]: Finished difference Result 124 states and 160 transitions. [2022-11-25 17:52:31,840 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-25 17:52:31,840 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.5) internal successors, (27), 6 states have internal predecessors, (27), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 35 [2022-11-25 17:52:31,840 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 17:52:31,841 INFO L225 Difference]: With dead ends: 124 [2022-11-25 17:52:31,841 INFO L226 Difference]: Without dead ends: 64 [2022-11-25 17:52:31,842 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 38 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=39, Invalid=117, Unknown=0, NotChecked=0, Total=156 [2022-11-25 17:52:31,842 INFO L413 NwaCegarLoop]: 60 mSDtfsCounter, 38 mSDsluCounter, 172 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 232 SdHoareTripleChecker+Invalid, 46 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 17:52:31,843 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [38 Valid, 232 Invalid, 46 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 17:52:31,843 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2022-11-25 17:52:31,851 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2022-11-25 17:52:31,852 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 52 states have (on average 1.3076923076923077) internal successors, (68), 53 states have internal predecessors, (68), 7 states have call successors, (7), 3 states have call predecessors, (7), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-11-25 17:52:31,852 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 81 transitions. [2022-11-25 17:52:31,852 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 81 transitions. Word has length 35 [2022-11-25 17:52:31,853 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 17:52:31,853 INFO L495 AbstractCegarLoop]: Abstraction has 63 states and 81 transitions. [2022-11-25 17:52:31,853 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 4.5) internal successors, (27), 6 states have internal predecessors, (27), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-25 17:52:31,853 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 81 transitions. [2022-11-25 17:52:31,854 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-11-25 17:52:31,854 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 17:52:31,854 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 17:52:31,866 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-25 17:52:32,061 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 17:52:32,061 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 17:52:32,062 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 17:52:32,062 INFO L85 PathProgramCache]: Analyzing trace with hash 1163666735, now seen corresponding path program 1 times [2022-11-25 17:52:32,062 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-25 17:52:32,062 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1276641346] [2022-11-25 17:52:32,063 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 17:52:32,063 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 17:52:32,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:52:32,245 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-11-25 17:52:32,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:52:32,249 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-11-25 17:52:32,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:52:32,253 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-11-25 17:52:32,253 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-25 17:52:32,253 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1276641346] [2022-11-25 17:52:32,254 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1276641346] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 17:52:32,254 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1631350876] [2022-11-25 17:52:32,254 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 17:52:32,254 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 17:52:32,255 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 [2022-11-25 17:52:32,256 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 17:52:32,267 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-25 17:52:32,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:52:32,371 INFO L263 TraceCheckSpWp]: Trace formula consists of 158 conjuncts, 17 conjunts are in the unsatisfiable core [2022-11-25 17:52:32,375 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 17:52:32,599 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-11-25 17:52:32,599 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 17:52:32,854 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-11-25 17:52:32,854 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1631350876] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 17:52:32,854 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 17:52:32,854 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7, 10] total 15 [2022-11-25 17:52:32,855 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1602765044] [2022-11-25 17:52:32,855 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 17:52:32,855 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-11-25 17:52:32,856 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-25 17:52:32,856 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-11-25 17:52:32,857 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2022-11-25 17:52:32,857 INFO L87 Difference]: Start difference. First operand 63 states and 81 transitions. Second operand has 15 states, 14 states have (on average 4.0) internal successors, (56), 14 states have internal predecessors, (56), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-25 17:52:33,165 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 17:52:33,165 INFO L93 Difference]: Finished difference Result 148 states and 198 transitions. [2022-11-25 17:52:33,166 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-11-25 17:52:33,166 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 4.0) internal successors, (56), 14 states have internal predecessors, (56), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 37 [2022-11-25 17:52:33,166 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 17:52:33,167 INFO L225 Difference]: With dead ends: 148 [2022-11-25 17:52:33,168 INFO L226 Difference]: Without dead ends: 125 [2022-11-25 17:52:33,168 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 66 SyntacticMatches, 3 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 50 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=69, Invalid=237, Unknown=0, NotChecked=0, Total=306 [2022-11-25 17:52:33,169 INFO L413 NwaCegarLoop]: 64 mSDtfsCounter, 119 mSDsluCounter, 620 mSDsCounter, 0 mSdLazyCounter, 208 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 122 SdHoareTripleChecker+Valid, 684 SdHoareTripleChecker+Invalid, 224 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 208 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-25 17:52:33,169 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [122 Valid, 684 Invalid, 224 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 208 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-25 17:52:33,170 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2022-11-25 17:52:33,186 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 93. [2022-11-25 17:52:33,187 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 81 states have (on average 1.3209876543209877) internal successors, (107), 82 states have internal predecessors, (107), 8 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2022-11-25 17:52:33,187 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 122 transitions. [2022-11-25 17:52:33,188 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 122 transitions. Word has length 37 [2022-11-25 17:52:33,188 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 17:52:33,188 INFO L495 AbstractCegarLoop]: Abstraction has 93 states and 122 transitions. [2022-11-25 17:52:33,188 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 4.0) internal successors, (56), 14 states have internal predecessors, (56), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-25 17:52:33,189 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 122 transitions. [2022-11-25 17:52:33,189 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-11-25 17:52:33,189 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 17:52:33,189 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 17:52:33,201 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-25 17:52:33,395 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2022-11-25 17:52:33,395 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 17:52:33,396 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 17:52:33,396 INFO L85 PathProgramCache]: Analyzing trace with hash 1165513777, now seen corresponding path program 1 times [2022-11-25 17:52:33,396 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-25 17:52:33,396 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [262722525] [2022-11-25 17:52:33,396 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 17:52:33,396 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 17:52:33,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:52:33,881 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-11-25 17:52:33,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:52:33,884 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-11-25 17:52:33,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:52:33,887 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-11-25 17:52:33,888 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-25 17:52:33,888 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [262722525] [2022-11-25 17:52:33,888 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [262722525] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 17:52:33,888 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [77944430] [2022-11-25 17:52:33,889 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 17:52:33,889 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 17:52:33,889 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 [2022-11-25 17:52:33,890 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 17:52:33,915 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-25 17:52:33,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:52:33,988 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 10 conjunts are in the unsatisfiable core [2022-11-25 17:52:33,989 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 17:52:34,063 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-11-25 17:52:34,064 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-25 17:52:34,064 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [77944430] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 17:52:34,064 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-25 17:52:34,064 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [11] total 13 [2022-11-25 17:52:34,067 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [916770599] [2022-11-25 17:52:34,067 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 17:52:34,068 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-25 17:52:34,068 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-25 17:52:34,069 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-25 17:52:34,069 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=128, Unknown=0, NotChecked=0, Total=156 [2022-11-25 17:52:34,069 INFO L87 Difference]: Start difference. First operand 93 states and 122 transitions. Second operand has 4 states, 4 states have (on average 7.25) internal successors, (29), 4 states have internal predecessors, (29), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-25 17:52:34,185 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 17:52:34,185 INFO L93 Difference]: Finished difference Result 127 states and 166 transitions. [2022-11-25 17:52:34,186 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-25 17:52:34,186 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 7.25) internal successors, (29), 4 states have internal predecessors, (29), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 37 [2022-11-25 17:52:34,187 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 17:52:34,188 INFO L225 Difference]: With dead ends: 127 [2022-11-25 17:52:34,188 INFO L226 Difference]: Without dead ends: 113 [2022-11-25 17:52:34,189 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=32, Invalid=150, Unknown=0, NotChecked=0, Total=182 [2022-11-25 17:52:34,189 INFO L413 NwaCegarLoop]: 74 mSDtfsCounter, 55 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 59 SdHoareTripleChecker+Valid, 141 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 17:52:34,190 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [59 Valid, 141 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 47 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 17:52:34,190 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2022-11-25 17:52:34,216 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 99. [2022-11-25 17:52:34,216 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 87 states have (on average 1.3103448275862069) internal successors, (114), 88 states have internal predecessors, (114), 8 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2022-11-25 17:52:34,217 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 129 transitions. [2022-11-25 17:52:34,217 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 129 transitions. Word has length 37 [2022-11-25 17:52:34,218 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 17:52:34,218 INFO L495 AbstractCegarLoop]: Abstraction has 99 states and 129 transitions. [2022-11-25 17:52:34,218 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 7.25) internal successors, (29), 4 states have internal predecessors, (29), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-25 17:52:34,218 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 129 transitions. [2022-11-25 17:52:34,219 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2022-11-25 17:52:34,219 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 17:52:34,219 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 17:52:34,230 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-25 17:52:34,425 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 17:52:34,426 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 17:52:34,426 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 17:52:34,427 INFO L85 PathProgramCache]: Analyzing trace with hash 2034579695, now seen corresponding path program 1 times [2022-11-25 17:52:34,427 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-25 17:52:34,427 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1851351491] [2022-11-25 17:52:34,427 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 17:52:34,427 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 17:52:34,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:52:34,733 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-11-25 17:52:34,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:52:34,737 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-11-25 17:52:34,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:52:34,743 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-11-25 17:52:34,744 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-25 17:52:34,744 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1851351491] [2022-11-25 17:52:34,744 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1851351491] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 17:52:34,745 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [168149850] [2022-11-25 17:52:34,745 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 17:52:34,745 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 17:52:34,745 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 [2022-11-25 17:52:34,747 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 17:52:34,775 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-25 17:52:34,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:52:34,853 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 18 conjunts are in the unsatisfiable core [2022-11-25 17:52:34,855 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 17:52:34,979 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-25 17:52:34,979 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 17:52:35,098 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-11-25 17:52:35,099 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [168149850] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 17:52:35,099 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 17:52:35,099 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9, 8] total 18 [2022-11-25 17:52:35,100 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1590198808] [2022-11-25 17:52:35,100 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 17:52:35,100 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-11-25 17:52:35,101 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-25 17:52:35,101 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-11-25 17:52:35,102 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=252, Unknown=0, NotChecked=0, Total=306 [2022-11-25 17:52:35,102 INFO L87 Difference]: Start difference. First operand 99 states and 129 transitions. Second operand has 18 states, 18 states have (on average 3.388888888888889) internal successors, (61), 18 states have internal predecessors, (61), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-25 17:52:35,725 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 17:52:35,725 INFO L93 Difference]: Finished difference Result 269 states and 362 transitions. [2022-11-25 17:52:35,726 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-11-25 17:52:35,726 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 3.388888888888889) internal successors, (61), 18 states have internal predecessors, (61), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 38 [2022-11-25 17:52:35,727 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 17:52:35,728 INFO L225 Difference]: With dead ends: 269 [2022-11-25 17:52:35,728 INFO L226 Difference]: Without dead ends: 192 [2022-11-25 17:52:35,729 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 69 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 100 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=125, Invalid=475, Unknown=0, NotChecked=0, Total=600 [2022-11-25 17:52:35,729 INFO L413 NwaCegarLoop]: 72 mSDtfsCounter, 437 mSDsluCounter, 550 mSDsCounter, 0 mSdLazyCounter, 387 mSolverCounterSat, 60 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 441 SdHoareTripleChecker+Valid, 622 SdHoareTripleChecker+Invalid, 447 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 60 IncrementalHoareTripleChecker+Valid, 387 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-25 17:52:35,730 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [441 Valid, 622 Invalid, 447 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [60 Valid, 387 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-25 17:52:35,730 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 192 states. [2022-11-25 17:52:35,763 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 192 to 122. [2022-11-25 17:52:35,763 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 122 states, 110 states have (on average 1.3) internal successors, (143), 111 states have internal predecessors, (143), 8 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2022-11-25 17:52:35,764 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 158 transitions. [2022-11-25 17:52:35,764 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 158 transitions. Word has length 38 [2022-11-25 17:52:35,765 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 17:52:35,765 INFO L495 AbstractCegarLoop]: Abstraction has 122 states and 158 transitions. [2022-11-25 17:52:35,765 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 3.388888888888889) internal successors, (61), 18 states have internal predecessors, (61), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-25 17:52:35,765 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 158 transitions. [2022-11-25 17:52:35,766 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2022-11-25 17:52:35,766 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 17:52:35,766 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 17:52:35,775 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-25 17:52:35,972 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-11-25 17:52:35,973 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 17:52:35,973 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 17:52:35,973 INFO L85 PathProgramCache]: Analyzing trace with hash 2103922323, now seen corresponding path program 1 times [2022-11-25 17:52:35,973 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-25 17:52:35,974 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [911302581] [2022-11-25 17:52:35,974 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 17:52:35,974 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 17:52:35,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:52:36,190 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-11-25 17:52:36,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:52:36,194 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-11-25 17:52:36,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:52:36,222 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 26 [2022-11-25 17:52:36,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:52:36,227 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-11-25 17:52:36,227 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-25 17:52:36,230 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [911302581] [2022-11-25 17:52:36,230 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [911302581] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 17:52:36,230 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [577920073] [2022-11-25 17:52:36,230 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 17:52:36,231 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 17:52:36,231 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 [2022-11-25 17:52:36,232 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 17:52:36,255 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-25 17:52:36,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:52:36,335 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 17 conjunts are in the unsatisfiable core [2022-11-25 17:52:36,339 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 17:52:36,484 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-25 17:52:36,484 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-25 17:52:36,485 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [577920073] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 17:52:36,485 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-25 17:52:36,485 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [8] total 12 [2022-11-25 17:52:36,485 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2118530989] [2022-11-25 17:52:36,485 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 17:52:36,486 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-25 17:52:36,486 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-25 17:52:36,487 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-25 17:52:36,487 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2022-11-25 17:52:36,487 INFO L87 Difference]: Start difference. First operand 122 states and 158 transitions. Second operand has 6 states, 6 states have (on average 5.333333333333333) internal successors, (32), 6 states have internal predecessors, (32), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-11-25 17:52:36,658 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 17:52:36,659 INFO L93 Difference]: Finished difference Result 167 states and 214 transitions. [2022-11-25 17:52:36,659 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-25 17:52:36,659 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 5.333333333333333) internal successors, (32), 6 states have internal predecessors, (32), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 42 [2022-11-25 17:52:36,660 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 17:52:36,661 INFO L225 Difference]: With dead ends: 167 [2022-11-25 17:52:36,661 INFO L226 Difference]: Without dead ends: 132 [2022-11-25 17:52:36,662 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 46 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=44, Invalid=138, Unknown=0, NotChecked=0, Total=182 [2022-11-25 17:52:36,663 INFO L413 NwaCegarLoop]: 55 mSDtfsCounter, 61 mSDsluCounter, 83 mSDsCounter, 0 mSdLazyCounter, 74 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 138 SdHoareTripleChecker+Invalid, 76 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 74 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 17:52:36,663 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [65 Valid, 138 Invalid, 76 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 74 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 17:52:36,664 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2022-11-25 17:52:36,693 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 124. [2022-11-25 17:52:36,694 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 112 states have (on average 1.2767857142857142) internal successors, (143), 113 states have internal predecessors, (143), 8 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2022-11-25 17:52:36,695 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 158 transitions. [2022-11-25 17:52:36,695 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 158 transitions. Word has length 42 [2022-11-25 17:52:36,695 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 17:52:36,696 INFO L495 AbstractCegarLoop]: Abstraction has 124 states and 158 transitions. [2022-11-25 17:52:36,696 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 5.333333333333333) internal successors, (32), 6 states have internal predecessors, (32), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-11-25 17:52:36,696 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 158 transitions. [2022-11-25 17:52:36,698 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2022-11-25 17:52:36,698 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 17:52:36,698 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 17:52:36,709 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-25 17:52:36,904 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-11-25 17:52:36,904 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 17:52:36,904 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 17:52:36,905 INFO L85 PathProgramCache]: Analyzing trace with hash -1093284825, now seen corresponding path program 1 times [2022-11-25 17:52:36,905 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-25 17:52:36,905 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1985691882] [2022-11-25 17:52:36,905 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 17:52:36,905 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 17:52:36,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:52:37,094 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-11-25 17:52:37,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:52:37,099 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-11-25 17:52:37,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:52:37,101 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-25 17:52:37,102 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-25 17:52:37,102 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1985691882] [2022-11-25 17:52:37,102 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1985691882] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 17:52:37,102 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1861954286] [2022-11-25 17:52:37,103 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 17:52:37,103 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 17:52:37,103 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 [2022-11-25 17:52:37,104 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 17:52:37,108 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-25 17:52:37,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:52:37,205 INFO L263 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 21 conjunts are in the unsatisfiable core [2022-11-25 17:52:37,209 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 17:52:37,523 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-11-25 17:52:37,524 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 17:52:37,669 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-25 17:52:37,669 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1861954286] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 17:52:37,669 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 17:52:37,670 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 12, 7] total 20 [2022-11-25 17:52:37,670 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [382603499] [2022-11-25 17:52:37,670 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 17:52:37,671 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-11-25 17:52:37,671 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-25 17:52:37,671 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-11-25 17:52:37,672 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=323, Unknown=0, NotChecked=0, Total=380 [2022-11-25 17:52:37,672 INFO L87 Difference]: Start difference. First operand 124 states and 158 transitions. Second operand has 20 states, 17 states have (on average 3.8823529411764706) internal successors, (66), 18 states have internal predecessors, (66), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-25 17:52:39,240 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 17:52:39,241 INFO L93 Difference]: Finished difference Result 350 states and 484 transitions. [2022-11-25 17:52:39,241 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2022-11-25 17:52:39,242 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 17 states have (on average 3.8823529411764706) internal successors, (66), 18 states have internal predecessors, (66), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 42 [2022-11-25 17:52:39,242 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 17:52:39,243 INFO L225 Difference]: With dead ends: 350 [2022-11-25 17:52:39,243 INFO L226 Difference]: Without dead ends: 320 [2022-11-25 17:52:39,245 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 77 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 425 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=322, Invalid=1658, Unknown=0, NotChecked=0, Total=1980 [2022-11-25 17:52:39,245 INFO L413 NwaCegarLoop]: 127 mSDtfsCounter, 534 mSDsluCounter, 1133 mSDsCounter, 0 mSdLazyCounter, 779 mSolverCounterSat, 109 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 534 SdHoareTripleChecker+Valid, 1260 SdHoareTripleChecker+Invalid, 888 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 109 IncrementalHoareTripleChecker+Valid, 779 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-25 17:52:39,245 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [534 Valid, 1260 Invalid, 888 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [109 Valid, 779 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-25 17:52:39,246 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 320 states. [2022-11-25 17:52:39,309 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 320 to 166. [2022-11-25 17:52:39,310 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 166 states, 154 states have (on average 1.3311688311688312) internal successors, (205), 155 states have internal predecessors, (205), 8 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2022-11-25 17:52:39,311 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 220 transitions. [2022-11-25 17:52:39,311 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 220 transitions. Word has length 42 [2022-11-25 17:52:39,312 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 17:52:39,313 INFO L495 AbstractCegarLoop]: Abstraction has 166 states and 220 transitions. [2022-11-25 17:52:39,313 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 17 states have (on average 3.8823529411764706) internal successors, (66), 18 states have internal predecessors, (66), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-25 17:52:39,313 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 220 transitions. [2022-11-25 17:52:39,314 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2022-11-25 17:52:39,314 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 17:52:39,314 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 17:52:39,325 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-11-25 17:52:39,520 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 17:52:39,522 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 17:52:39,522 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 17:52:39,523 INFO L85 PathProgramCache]: Analyzing trace with hash -1902631451, now seen corresponding path program 1 times [2022-11-25 17:52:39,523 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-25 17:52:39,523 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1587854591] [2022-11-25 17:52:39,523 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 17:52:39,523 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 17:52:39,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:52:40,528 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-11-25 17:52:40,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:52:40,531 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-11-25 17:52:40,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:52:40,534 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-25 17:52:40,534 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-25 17:52:40,534 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1587854591] [2022-11-25 17:52:40,534 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1587854591] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 17:52:40,534 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [880956630] [2022-11-25 17:52:40,535 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 17:52:40,535 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 17:52:40,535 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 [2022-11-25 17:52:40,536 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 17:52:40,565 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-25 17:52:40,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:52:40,643 INFO L263 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 65 conjunts are in the unsatisfiable core [2022-11-25 17:52:40,646 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 17:52:40,845 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2022-11-25 17:52:41,114 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 17:52:41,116 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 17:52:41,127 INFO L321 Elim1Store]: treesize reduction 12, result has 40.0 percent of original size [2022-11-25 17:52:41,127 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 76 treesize of output 39 [2022-11-25 17:52:41,158 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-25 17:52:41,159 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 17:52:41,568 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-25 17:52:41,569 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [880956630] provided 1 perfect and 1 imperfect interpolant sequences [2022-11-25 17:52:41,569 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-11-25 17:52:41,569 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [11, 17] total 31 [2022-11-25 17:52:41,569 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [211986924] [2022-11-25 17:52:41,569 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 17:52:41,569 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-11-25 17:52:41,570 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-25 17:52:41,570 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-11-25 17:52:41,570 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=819, Unknown=0, NotChecked=0, Total=930 [2022-11-25 17:52:41,571 INFO L87 Difference]: Start difference. First operand 166 states and 220 transitions. Second operand has 12 states, 11 states have (on average 2.909090909090909) internal successors, (32), 11 states have internal predecessors, (32), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-25 17:52:42,203 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 17:52:42,203 INFO L93 Difference]: Finished difference Result 297 states and 404 transitions. [2022-11-25 17:52:42,204 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-25 17:52:42,204 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 2.909090909090909) internal successors, (32), 11 states have internal predecessors, (32), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 42 [2022-11-25 17:52:42,204 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 17:52:42,208 INFO L225 Difference]: With dead ends: 297 [2022-11-25 17:52:42,208 INFO L226 Difference]: Without dead ends: 288 [2022-11-25 17:52:42,209 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 68 SyntacticMatches, 2 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 388 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=179, Invalid=1227, Unknown=0, NotChecked=0, Total=1406 [2022-11-25 17:52:42,210 INFO L413 NwaCegarLoop]: 91 mSDtfsCounter, 117 mSDsluCounter, 585 mSDsCounter, 0 mSdLazyCounter, 272 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 125 SdHoareTripleChecker+Valid, 676 SdHoareTripleChecker+Invalid, 278 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 272 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-25 17:52:42,210 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [125 Valid, 676 Invalid, 278 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 272 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-25 17:52:42,212 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 288 states. [2022-11-25 17:52:42,267 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 288 to 207. [2022-11-25 17:52:42,268 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 207 states, 195 states have (on average 1.353846153846154) internal successors, (264), 196 states have internal predecessors, (264), 8 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2022-11-25 17:52:42,270 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 207 states to 207 states and 279 transitions. [2022-11-25 17:52:42,270 INFO L78 Accepts]: Start accepts. Automaton has 207 states and 279 transitions. Word has length 42 [2022-11-25 17:52:42,271 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 17:52:42,271 INFO L495 AbstractCegarLoop]: Abstraction has 207 states and 279 transitions. [2022-11-25 17:52:42,271 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 2.909090909090909) internal successors, (32), 11 states have internal predecessors, (32), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-25 17:52:42,271 INFO L276 IsEmpty]: Start isEmpty. Operand 207 states and 279 transitions. [2022-11-25 17:52:42,272 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-11-25 17:52:42,272 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 17:52:42,272 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 17:52:42,284 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-11-25 17:52:42,484 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-11-25 17:52:42,484 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 17:52:42,485 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 17:52:42,485 INFO L85 PathProgramCache]: Analyzing trace with hash -1797758865, now seen corresponding path program 1 times [2022-11-25 17:52:42,485 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-25 17:52:42,485 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [660207954] [2022-11-25 17:52:42,486 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 17:52:42,487 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 17:52:42,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:52:42,886 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-11-25 17:52:42,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:52:42,888 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-11-25 17:52:42,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:52:42,891 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-25 17:52:42,891 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-25 17:52:42,891 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [660207954] [2022-11-25 17:52:42,891 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [660207954] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 17:52:42,891 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1300588756] [2022-11-25 17:52:42,891 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 17:52:42,892 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 17:52:42,892 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 [2022-11-25 17:52:42,896 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 17:52:42,902 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-25 17:52:42,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:52:42,993 INFO L263 TraceCheckSpWp]: Trace formula consists of 180 conjuncts, 14 conjunts are in the unsatisfiable core [2022-11-25 17:52:42,995 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 17:52:43,108 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-25 17:52:43,108 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 17:52:43,230 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-25 17:52:43,231 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1300588756] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 17:52:43,231 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 17:52:43,231 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 18 [2022-11-25 17:52:43,231 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [51846350] [2022-11-25 17:52:43,231 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 17:52:43,231 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-11-25 17:52:43,232 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-25 17:52:43,232 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-11-25 17:52:43,232 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=251, Unknown=0, NotChecked=0, Total=306 [2022-11-25 17:52:43,233 INFO L87 Difference]: Start difference. First operand 207 states and 279 transitions. Second operand has 18 states, 18 states have (on average 3.1666666666666665) internal successors, (57), 18 states have internal predecessors, (57), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-25 17:52:43,633 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 17:52:43,633 INFO L93 Difference]: Finished difference Result 258 states and 342 transitions. [2022-11-25 17:52:43,634 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-11-25 17:52:43,634 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 3.1666666666666665) internal successors, (57), 18 states have internal predecessors, (57), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 43 [2022-11-25 17:52:43,634 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 17:52:43,635 INFO L225 Difference]: With dead ends: 258 [2022-11-25 17:52:43,635 INFO L226 Difference]: Without dead ends: 182 [2022-11-25 17:52:43,636 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 81 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 81 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=110, Invalid=396, Unknown=0, NotChecked=0, Total=506 [2022-11-25 17:52:43,637 INFO L413 NwaCegarLoop]: 61 mSDtfsCounter, 173 mSDsluCounter, 587 mSDsCounter, 0 mSdLazyCounter, 205 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 173 SdHoareTripleChecker+Valid, 648 SdHoareTripleChecker+Invalid, 233 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 205 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-25 17:52:43,637 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [173 Valid, 648 Invalid, 233 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 205 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-25 17:52:43,638 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 182 states. [2022-11-25 17:52:43,730 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 182 to 158. [2022-11-25 17:52:43,731 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 158 states, 146 states have (on average 1.321917808219178) internal successors, (193), 147 states have internal predecessors, (193), 8 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2022-11-25 17:52:43,732 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 158 states to 158 states and 208 transitions. [2022-11-25 17:52:43,732 INFO L78 Accepts]: Start accepts. Automaton has 158 states and 208 transitions. Word has length 43 [2022-11-25 17:52:43,732 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 17:52:43,733 INFO L495 AbstractCegarLoop]: Abstraction has 158 states and 208 transitions. [2022-11-25 17:52:43,733 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 3.1666666666666665) internal successors, (57), 18 states have internal predecessors, (57), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-25 17:52:43,733 INFO L276 IsEmpty]: Start isEmpty. Operand 158 states and 208 transitions. [2022-11-25 17:52:43,734 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2022-11-25 17:52:43,734 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 17:52:43,734 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 17:52:43,747 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-25 17:52:43,940 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-11-25 17:52:43,940 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 17:52:43,940 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 17:52:43,940 INFO L85 PathProgramCache]: Analyzing trace with hash -2052626821, now seen corresponding path program 1 times [2022-11-25 17:52:43,940 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-25 17:52:43,941 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1489324414] [2022-11-25 17:52:43,941 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 17:52:43,941 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 17:52:43,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:52:44,159 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-11-25 17:52:44,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:52:44,162 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-11-25 17:52:44,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:52:44,164 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2022-11-25 17:52:44,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:52:44,169 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-25 17:52:44,170 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-25 17:52:44,170 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1489324414] [2022-11-25 17:52:44,170 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1489324414] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 17:52:44,170 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [891288901] [2022-11-25 17:52:44,170 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 17:52:44,171 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 17:52:44,171 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 [2022-11-25 17:52:44,172 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 17:52:44,191 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-25 17:52:44,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:52:44,268 INFO L263 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 5 conjunts are in the unsatisfiable core [2022-11-25 17:52:44,269 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 17:52:44,290 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-11-25 17:52:44,291 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-25 17:52:44,291 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [891288901] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 17:52:44,291 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-25 17:52:44,291 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [8] total 9 [2022-11-25 17:52:44,291 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1617441154] [2022-11-25 17:52:44,292 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 17:52:44,292 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-25 17:52:44,292 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-25 17:52:44,293 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-25 17:52:44,293 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2022-11-25 17:52:44,293 INFO L87 Difference]: Start difference. First operand 158 states and 208 transitions. Second operand has 3 states, 3 states have (on average 11.666666666666666) internal successors, (35), 3 states have internal predecessors, (35), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2022-11-25 17:52:44,368 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 17:52:44,368 INFO L93 Difference]: Finished difference Result 188 states and 247 transitions. [2022-11-25 17:52:44,368 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-25 17:52:44,369 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 11.666666666666666) internal successors, (35), 3 states have internal predecessors, (35), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 45 [2022-11-25 17:52:44,369 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 17:52:44,370 INFO L225 Difference]: With dead ends: 188 [2022-11-25 17:52:44,371 INFO L226 Difference]: Without dead ends: 167 [2022-11-25 17:52:44,371 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2022-11-25 17:52:44,372 INFO L413 NwaCegarLoop]: 64 mSDtfsCounter, 5 mSDsluCounter, 58 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 122 SdHoareTripleChecker+Invalid, 16 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-25 17:52:44,372 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 122 Invalid, 16 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 16 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-25 17:52:44,373 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 167 states. [2022-11-25 17:52:44,415 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 167 to 162. [2022-11-25 17:52:44,416 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 162 states, 150 states have (on average 1.3266666666666667) internal successors, (199), 151 states have internal predecessors, (199), 8 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2022-11-25 17:52:44,418 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 214 transitions. [2022-11-25 17:52:44,419 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 214 transitions. Word has length 45 [2022-11-25 17:52:44,419 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 17:52:44,419 INFO L495 AbstractCegarLoop]: Abstraction has 162 states and 214 transitions. [2022-11-25 17:52:44,419 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 11.666666666666666) internal successors, (35), 3 states have internal predecessors, (35), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2022-11-25 17:52:44,419 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 214 transitions. [2022-11-25 17:52:44,420 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2022-11-25 17:52:44,420 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 17:52:44,420 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 17:52:44,431 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-11-25 17:52:44,626 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-11-25 17:52:44,627 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 17:52:44,627 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 17:52:44,627 INFO L85 PathProgramCache]: Analyzing trace with hash -1015993583, now seen corresponding path program 2 times [2022-11-25 17:52:44,628 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-25 17:52:44,628 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [698888759] [2022-11-25 17:52:44,628 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 17:52:44,628 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 17:52:44,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:52:45,258 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-11-25 17:52:45,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:52:45,260 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-11-25 17:52:45,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:52:45,262 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-11-25 17:52:45,263 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-25 17:52:45,263 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [698888759] [2022-11-25 17:52:45,263 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [698888759] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 17:52:45,263 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1487650461] [2022-11-25 17:52:45,263 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-25 17:52:45,265 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 17:52:45,265 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 [2022-11-25 17:52:45,266 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 17:52:45,293 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-11-25 17:52:45,394 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-25 17:52:45,394 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 17:52:45,396 INFO L263 TraceCheckSpWp]: Trace formula consists of 189 conjuncts, 15 conjunts are in the unsatisfiable core [2022-11-25 17:52:45,398 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 17:52:45,612 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-25 17:52:45,613 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 17:52:45,834 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-25 17:52:45,834 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1487650461] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 17:52:45,834 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 17:52:45,835 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 9, 8] total 24 [2022-11-25 17:52:45,835 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [990852638] [2022-11-25 17:52:45,835 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 17:52:45,835 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-11-25 17:52:45,835 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-25 17:52:45,836 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-11-25 17:52:45,836 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=469, Unknown=0, NotChecked=0, Total=552 [2022-11-25 17:52:45,836 INFO L87 Difference]: Start difference. First operand 162 states and 214 transitions. Second operand has 24 states, 24 states have (on average 2.7916666666666665) internal successors, (67), 24 states have internal predecessors, (67), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-25 17:52:48,534 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 17:52:48,534 INFO L93 Difference]: Finished difference Result 661 states and 912 transitions. [2022-11-25 17:52:48,534 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2022-11-25 17:52:48,535 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 2.7916666666666665) internal successors, (67), 24 states have internal predecessors, (67), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 45 [2022-11-25 17:52:48,535 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 17:52:48,537 INFO L225 Difference]: With dead ends: 661 [2022-11-25 17:52:48,537 INFO L226 Difference]: Without dead ends: 551 [2022-11-25 17:52:48,539 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 82 SyntacticMatches, 2 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 715 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=584, Invalid=2608, Unknown=0, NotChecked=0, Total=3192 [2022-11-25 17:52:48,539 INFO L413 NwaCegarLoop]: 158 mSDtfsCounter, 768 mSDsluCounter, 1188 mSDsCounter, 0 mSdLazyCounter, 724 mSolverCounterSat, 138 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 772 SdHoareTripleChecker+Valid, 1346 SdHoareTripleChecker+Invalid, 862 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 138 IncrementalHoareTripleChecker+Valid, 724 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-11-25 17:52:48,540 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [772 Valid, 1346 Invalid, 862 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [138 Valid, 724 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-11-25 17:52:48,540 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 551 states. [2022-11-25 17:52:48,623 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 551 to 236. [2022-11-25 17:52:48,624 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 236 states, 224 states have (on average 1.34375) internal successors, (301), 225 states have internal predecessors, (301), 8 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2022-11-25 17:52:48,626 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 236 states to 236 states and 316 transitions. [2022-11-25 17:52:48,626 INFO L78 Accepts]: Start accepts. Automaton has 236 states and 316 transitions. Word has length 45 [2022-11-25 17:52:48,626 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 17:52:48,626 INFO L495 AbstractCegarLoop]: Abstraction has 236 states and 316 transitions. [2022-11-25 17:52:48,627 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 2.7916666666666665) internal successors, (67), 24 states have internal predecessors, (67), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-25 17:52:48,627 INFO L276 IsEmpty]: Start isEmpty. Operand 236 states and 316 transitions. [2022-11-25 17:52:48,628 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2022-11-25 17:52:48,628 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 17:52:48,628 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 17:52:48,646 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-11-25 17:52:48,835 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 17:52:48,836 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 17:52:48,836 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 17:52:48,836 INFO L85 PathProgramCache]: Analyzing trace with hash -1957197463, now seen corresponding path program 1 times [2022-11-25 17:52:48,836 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-25 17:52:48,836 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1363121886] [2022-11-25 17:52:48,837 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 17:52:48,837 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 17:52:48,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:52:50,087 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-11-25 17:52:50,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:52:50,090 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-11-25 17:52:50,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:52:50,093 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2022-11-25 17:52:50,093 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-25 17:52:50,093 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1363121886] [2022-11-25 17:52:50,093 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1363121886] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 17:52:50,093 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1787811249] [2022-11-25 17:52:50,094 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 17:52:50,094 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 17:52:50,094 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 [2022-11-25 17:52:50,108 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 17:52:50,120 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-11-25 17:52:50,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:52:50,267 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 59 conjunts are in the unsatisfiable core [2022-11-25 17:52:50,270 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 17:52:50,912 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 17:52:50,914 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 17:52:50,916 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 17:52:50,917 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 17:52:50,924 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-25 17:52:50,924 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 3 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 10 case distinctions, treesize of input 76 treesize of output 42 [2022-11-25 17:52:50,961 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 3 proven. 12 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-11-25 17:52:50,961 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 17:52:51,344 INFO L321 Elim1Store]: treesize reduction 17, result has 83.0 percent of original size [2022-11-25 17:52:51,345 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 37 treesize of output 90 [2022-11-25 17:52:52,185 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 3 proven. 5 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-25 17:52:52,185 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1787811249] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 17:52:52,186 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 17:52:52,186 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 18, 12] total 33 [2022-11-25 17:52:52,186 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1032383600] [2022-11-25 17:52:52,186 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 17:52:52,187 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2022-11-25 17:52:52,187 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-25 17:52:52,188 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2022-11-25 17:52:52,188 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=936, Unknown=0, NotChecked=0, Total=1056 [2022-11-25 17:52:52,188 INFO L87 Difference]: Start difference. First operand 236 states and 316 transitions. Second operand has 33 states, 33 states have (on average 2.3333333333333335) internal successors, (77), 33 states have internal predecessors, (77), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-25 17:52:55,624 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 17:52:55,624 INFO L93 Difference]: Finished difference Result 587 states and 796 transitions. [2022-11-25 17:52:55,625 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-11-25 17:52:55,625 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 2.3333333333333335) internal successors, (77), 33 states have internal predecessors, (77), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 48 [2022-11-25 17:52:55,625 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 17:52:55,628 INFO L225 Difference]: With dead ends: 587 [2022-11-25 17:52:55,628 INFO L226 Difference]: Without dead ends: 455 [2022-11-25 17:52:55,629 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 80 SyntacticMatches, 4 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 683 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=402, Invalid=2568, Unknown=0, NotChecked=0, Total=2970 [2022-11-25 17:52:55,629 INFO L413 NwaCegarLoop]: 125 mSDtfsCounter, 383 mSDsluCounter, 1841 mSDsCounter, 0 mSdLazyCounter, 1939 mSolverCounterSat, 54 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 391 SdHoareTripleChecker+Valid, 1966 SdHoareTripleChecker+Invalid, 1993 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 54 IncrementalHoareTripleChecker+Valid, 1939 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2022-11-25 17:52:55,630 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [391 Valid, 1966 Invalid, 1993 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [54 Valid, 1939 Invalid, 0 Unknown, 0 Unchecked, 1.9s Time] [2022-11-25 17:52:55,636 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 455 states. [2022-11-25 17:52:55,747 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 455 to 260. [2022-11-25 17:52:55,748 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 260 states, 248 states have (on average 1.3346774193548387) internal successors, (331), 249 states have internal predecessors, (331), 8 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2022-11-25 17:52:55,749 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 260 states to 260 states and 346 transitions. [2022-11-25 17:52:55,749 INFO L78 Accepts]: Start accepts. Automaton has 260 states and 346 transitions. Word has length 48 [2022-11-25 17:52:55,749 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 17:52:55,749 INFO L495 AbstractCegarLoop]: Abstraction has 260 states and 346 transitions. [2022-11-25 17:52:55,750 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 2.3333333333333335) internal successors, (77), 33 states have internal predecessors, (77), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-25 17:52:55,750 INFO L276 IsEmpty]: Start isEmpty. Operand 260 states and 346 transitions. [2022-11-25 17:52:55,751 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2022-11-25 17:52:55,751 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 17:52:55,751 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 17:52:55,760 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-11-25 17:52:55,957 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 17:52:55,957 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 17:52:55,957 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 17:52:55,958 INFO L85 PathProgramCache]: Analyzing trace with hash -1256132885, now seen corresponding path program 1 times [2022-11-25 17:52:55,958 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-25 17:52:55,958 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [559398400] [2022-11-25 17:52:55,958 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 17:52:55,958 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 17:52:56,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:52:57,228 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-11-25 17:52:57,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:52:57,231 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-11-25 17:52:57,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:52:57,234 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 3 proven. 3 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2022-11-25 17:52:57,234 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-25 17:52:57,234 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [559398400] [2022-11-25 17:52:57,235 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [559398400] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 17:52:57,235 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1294199076] [2022-11-25 17:52:57,235 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 17:52:57,235 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 17:52:57,236 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 [2022-11-25 17:52:57,256 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 17:52:57,281 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-11-25 17:52:57,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:52:57,369 INFO L263 TraceCheckSpWp]: Trace formula consists of 198 conjuncts, 56 conjunts are in the unsatisfiable core [2022-11-25 17:52:57,371 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 17:52:57,725 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 17:52:57,726 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 17:52:57,739 INFO L321 Elim1Store]: treesize reduction 12, result has 40.0 percent of original size [2022-11-25 17:52:57,740 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 76 treesize of output 39 [2022-11-25 17:52:57,766 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-25 17:52:57,766 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 17:52:58,089 INFO L321 Elim1Store]: treesize reduction 15, result has 84.2 percent of original size [2022-11-25 17:52:58,090 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 35 treesize of output 87 [2022-11-25 17:52:58,360 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 3 proven. 3 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2022-11-25 17:52:58,360 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1294199076] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 17:52:58,360 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 17:52:58,360 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13, 12] total 28 [2022-11-25 17:52:58,361 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1337171958] [2022-11-25 17:52:58,361 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 17:52:58,361 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-11-25 17:52:58,361 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-25 17:52:58,362 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-11-25 17:52:58,363 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=622, Unknown=0, NotChecked=0, Total=756 [2022-11-25 17:52:58,363 INFO L87 Difference]: Start difference. First operand 260 states and 346 transitions. Second operand has 28 states, 28 states have (on average 2.7142857142857144) internal successors, (76), 27 states have internal predecessors, (76), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-25 17:52:59,330 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 17:52:59,330 INFO L93 Difference]: Finished difference Result 487 states and 655 transitions. [2022-11-25 17:52:59,331 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-11-25 17:52:59,331 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 2.7142857142857144) internal successors, (76), 27 states have internal predecessors, (76), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 48 [2022-11-25 17:52:59,331 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 17:52:59,333 INFO L225 Difference]: With dead ends: 487 [2022-11-25 17:52:59,333 INFO L226 Difference]: Without dead ends: 355 [2022-11-25 17:52:59,334 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 85 SyntacticMatches, 2 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 355 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=207, Invalid=849, Unknown=0, NotChecked=0, Total=1056 [2022-11-25 17:52:59,335 INFO L413 NwaCegarLoop]: 81 mSDtfsCounter, 244 mSDsluCounter, 901 mSDsCounter, 0 mSdLazyCounter, 553 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 248 SdHoareTripleChecker+Valid, 982 SdHoareTripleChecker+Invalid, 583 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 553 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-25 17:52:59,335 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [248 Valid, 982 Invalid, 583 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 553 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-25 17:52:59,336 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 355 states. [2022-11-25 17:52:59,422 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 355 to 243. [2022-11-25 17:52:59,422 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 243 states, 231 states have (on average 1.303030303030303) internal successors, (301), 232 states have internal predecessors, (301), 8 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2022-11-25 17:52:59,423 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 243 states to 243 states and 316 transitions. [2022-11-25 17:52:59,424 INFO L78 Accepts]: Start accepts. Automaton has 243 states and 316 transitions. Word has length 48 [2022-11-25 17:52:59,424 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 17:52:59,424 INFO L495 AbstractCegarLoop]: Abstraction has 243 states and 316 transitions. [2022-11-25 17:52:59,424 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 2.7142857142857144) internal successors, (76), 27 states have internal predecessors, (76), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-25 17:52:59,425 INFO L276 IsEmpty]: Start isEmpty. Operand 243 states and 316 transitions. [2022-11-25 17:52:59,425 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2022-11-25 17:52:59,426 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 17:52:59,426 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 17:52:59,438 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-11-25 17:52:59,631 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 17:52:59,632 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 17:52:59,632 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 17:52:59,632 INFO L85 PathProgramCache]: Analyzing trace with hash 1737037141, now seen corresponding path program 1 times [2022-11-25 17:52:59,632 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-25 17:52:59,632 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [882287246] [2022-11-25 17:52:59,632 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 17:52:59,632 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 17:52:59,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:52:59,686 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-11-25 17:52:59,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:52:59,688 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-11-25 17:52:59,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:52:59,690 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2022-11-25 17:52:59,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:52:59,693 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-11-25 17:52:59,693 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-25 17:52:59,693 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [882287246] [2022-11-25 17:52:59,693 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [882287246] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 17:52:59,694 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-25 17:52:59,694 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-25 17:52:59,694 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1150664851] [2022-11-25 17:52:59,694 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 17:52:59,694 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-25 17:52:59,695 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-25 17:52:59,695 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-25 17:52:59,695 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-25 17:52:59,696 INFO L87 Difference]: Start difference. First operand 243 states and 316 transitions. Second operand has 4 states, 4 states have (on average 10.0) internal successors, (40), 4 states have internal predecessors, (40), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2022-11-25 17:52:59,800 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 17:52:59,801 INFO L93 Difference]: Finished difference Result 266 states and 343 transitions. [2022-11-25 17:52:59,802 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-25 17:52:59,803 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 10.0) internal successors, (40), 4 states have internal predecessors, (40), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 50 [2022-11-25 17:52:59,803 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 17:52:59,804 INFO L225 Difference]: With dead ends: 266 [2022-11-25 17:52:59,804 INFO L226 Difference]: Without dead ends: 244 [2022-11-25 17:52:59,804 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-25 17:52:59,805 INFO L413 NwaCegarLoop]: 64 mSDtfsCounter, 6 mSDsluCounter, 53 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 117 SdHoareTripleChecker+Invalid, 18 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-25 17:52:59,806 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 117 Invalid, 18 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-25 17:52:59,806 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 244 states. [2022-11-25 17:52:59,883 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 244 to 242. [2022-11-25 17:52:59,884 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 242 states, 230 states have (on average 1.2956521739130435) internal successors, (298), 231 states have internal predecessors, (298), 8 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2022-11-25 17:52:59,886 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 242 states to 242 states and 313 transitions. [2022-11-25 17:52:59,886 INFO L78 Accepts]: Start accepts. Automaton has 242 states and 313 transitions. Word has length 50 [2022-11-25 17:52:59,886 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 17:52:59,886 INFO L495 AbstractCegarLoop]: Abstraction has 242 states and 313 transitions. [2022-11-25 17:52:59,887 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 10.0) internal successors, (40), 4 states have internal predecessors, (40), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2022-11-25 17:52:59,887 INFO L276 IsEmpty]: Start isEmpty. Operand 242 states and 313 transitions. [2022-11-25 17:52:59,890 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2022-11-25 17:52:59,891 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 17:52:59,891 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 17:52:59,891 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2022-11-25 17:52:59,892 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 17:52:59,893 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 17:52:59,893 INFO L85 PathProgramCache]: Analyzing trace with hash -23820843, now seen corresponding path program 1 times [2022-11-25 17:52:59,893 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-25 17:52:59,893 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1728053735] [2022-11-25 17:52:59,893 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 17:52:59,894 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 17:52:59,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:53:00,195 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-11-25 17:53:00,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:53:00,197 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-11-25 17:53:00,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:53:00,200 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-11-25 17:53:00,200 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-25 17:53:00,200 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1728053735] [2022-11-25 17:53:00,200 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1728053735] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 17:53:00,200 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [241349099] [2022-11-25 17:53:00,200 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 17:53:00,200 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 17:53:00,200 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 [2022-11-25 17:53:00,212 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 17:53:00,224 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-11-25 17:53:00,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:53:00,329 INFO L263 TraceCheckSpWp]: Trace formula consists of 205 conjuncts, 15 conjunts are in the unsatisfiable core [2022-11-25 17:53:00,330 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 17:53:00,600 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-25 17:53:00,600 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 17:53:00,957 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-25 17:53:00,958 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [241349099] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 17:53:00,958 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 17:53:00,958 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 24 [2022-11-25 17:53:00,958 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [346989950] [2022-11-25 17:53:00,959 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 17:53:00,963 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-11-25 17:53:00,963 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-25 17:53:00,963 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-11-25 17:53:00,964 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=480, Unknown=0, NotChecked=0, Total=552 [2022-11-25 17:53:00,964 INFO L87 Difference]: Start difference. First operand 242 states and 313 transitions. Second operand has 24 states, 24 states have (on average 3.25) internal successors, (78), 24 states have internal predecessors, (78), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-25 17:53:04,267 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 17:53:04,267 INFO L93 Difference]: Finished difference Result 689 states and 913 transitions. [2022-11-25 17:53:04,272 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2022-11-25 17:53:04,272 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 3.25) internal successors, (78), 24 states have internal predecessors, (78), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 49 [2022-11-25 17:53:04,272 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 17:53:04,279 INFO L225 Difference]: With dead ends: 689 [2022-11-25 17:53:04,280 INFO L226 Difference]: Without dead ends: 681 [2022-11-25 17:53:04,281 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 88 SyntacticMatches, 0 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1099 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=662, Invalid=3628, Unknown=0, NotChecked=0, Total=4290 [2022-11-25 17:53:04,282 INFO L413 NwaCegarLoop]: 191 mSDtfsCounter, 1733 mSDsluCounter, 1597 mSDsCounter, 0 mSdLazyCounter, 1067 mSolverCounterSat, 332 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1733 SdHoareTripleChecker+Valid, 1788 SdHoareTripleChecker+Invalid, 1399 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 332 IncrementalHoareTripleChecker+Valid, 1067 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-11-25 17:53:04,282 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1733 Valid, 1788 Invalid, 1399 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [332 Valid, 1067 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-11-25 17:53:04,284 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 681 states. [2022-11-25 17:53:04,386 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 681 to 245. [2022-11-25 17:53:04,387 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 245 states, 233 states have (on average 1.2918454935622317) internal successors, (301), 234 states have internal predecessors, (301), 8 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2022-11-25 17:53:04,388 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 245 states to 245 states and 316 transitions. [2022-11-25 17:53:04,389 INFO L78 Accepts]: Start accepts. Automaton has 245 states and 316 transitions. Word has length 49 [2022-11-25 17:53:04,389 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 17:53:04,389 INFO L495 AbstractCegarLoop]: Abstraction has 245 states and 316 transitions. [2022-11-25 17:53:04,389 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 3.25) internal successors, (78), 24 states have internal predecessors, (78), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-25 17:53:04,390 INFO L276 IsEmpty]: Start isEmpty. Operand 245 states and 316 transitions. [2022-11-25 17:53:04,390 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2022-11-25 17:53:04,391 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 17:53:04,391 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 17:53:04,403 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-11-25 17:53:04,596 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 17:53:04,597 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 17:53:04,597 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 17:53:04,597 INFO L85 PathProgramCache]: Analyzing trace with hash -319274875, now seen corresponding path program 1 times [2022-11-25 17:53:04,597 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-25 17:53:04,598 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [220878604] [2022-11-25 17:53:04,598 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 17:53:04,598 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 17:53:04,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:53:04,973 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-11-25 17:53:04,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:53:04,975 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-11-25 17:53:04,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:53:04,977 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2022-11-25 17:53:04,978 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-25 17:53:04,978 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [220878604] [2022-11-25 17:53:04,978 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [220878604] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 17:53:04,978 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1415715637] [2022-11-25 17:53:04,978 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 17:53:04,978 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 17:53:04,978 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 [2022-11-25 17:53:04,981 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 17:53:04,985 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-11-25 17:53:05,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:53:05,122 INFO L263 TraceCheckSpWp]: Trace formula consists of 209 conjuncts, 24 conjunts are in the unsatisfiable core [2022-11-25 17:53:05,124 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 17:53:05,360 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 3 proven. 13 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-25 17:53:05,360 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 17:53:05,566 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2022-11-25 17:53:05,566 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1415715637] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 17:53:05,566 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 17:53:05,566 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 10] total 23 [2022-11-25 17:53:05,567 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [890632884] [2022-11-25 17:53:05,567 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 17:53:05,567 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-11-25 17:53:05,567 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-25 17:53:05,567 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-11-25 17:53:05,568 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=437, Unknown=0, NotChecked=0, Total=506 [2022-11-25 17:53:05,568 INFO L87 Difference]: Start difference. First operand 245 states and 316 transitions. Second operand has 23 states, 23 states have (on average 2.869565217391304) internal successors, (66), 23 states have internal predecessors, (66), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-25 17:53:07,497 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 17:53:07,497 INFO L93 Difference]: Finished difference Result 727 states and 955 transitions. [2022-11-25 17:53:07,497 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-11-25 17:53:07,497 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 2.869565217391304) internal successors, (66), 23 states have internal predecessors, (66), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 51 [2022-11-25 17:53:07,498 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 17:53:07,500 INFO L225 Difference]: With dead ends: 727 [2022-11-25 17:53:07,500 INFO L226 Difference]: Without dead ends: 565 [2022-11-25 17:53:07,501 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 90 SyntacticMatches, 5 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 389 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=325, Invalid=1655, Unknown=0, NotChecked=0, Total=1980 [2022-11-25 17:53:07,502 INFO L413 NwaCegarLoop]: 123 mSDtfsCounter, 1071 mSDsluCounter, 1441 mSDsCounter, 0 mSdLazyCounter, 934 mSolverCounterSat, 156 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1075 SdHoareTripleChecker+Valid, 1564 SdHoareTripleChecker+Invalid, 1090 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 156 IncrementalHoareTripleChecker+Valid, 934 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-11-25 17:53:07,502 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1075 Valid, 1564 Invalid, 1090 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [156 Valid, 934 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-11-25 17:53:07,503 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 565 states. [2022-11-25 17:53:07,578 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 565 to 273. [2022-11-25 17:53:07,578 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 273 states, 261 states have (on average 1.3026819923371646) internal successors, (340), 262 states have internal predecessors, (340), 8 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2022-11-25 17:53:07,579 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 273 states to 273 states and 355 transitions. [2022-11-25 17:53:07,579 INFO L78 Accepts]: Start accepts. Automaton has 273 states and 355 transitions. Word has length 51 [2022-11-25 17:53:07,579 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 17:53:07,579 INFO L495 AbstractCegarLoop]: Abstraction has 273 states and 355 transitions. [2022-11-25 17:53:07,579 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 2.869565217391304) internal successors, (66), 23 states have internal predecessors, (66), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-25 17:53:07,579 INFO L276 IsEmpty]: Start isEmpty. Operand 273 states and 355 transitions. [2022-11-25 17:53:07,580 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2022-11-25 17:53:07,580 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 17:53:07,580 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 17:53:07,586 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-11-25 17:53:07,781 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2022-11-25 17:53:07,781 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 17:53:07,781 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 17:53:07,781 INFO L85 PathProgramCache]: Analyzing trace with hash -175162644, now seen corresponding path program 1 times [2022-11-25 17:53:07,781 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-25 17:53:07,782 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1328276070] [2022-11-25 17:53:07,782 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 17:53:07,782 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 17:53:07,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:53:08,007 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-11-25 17:53:08,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:53:08,009 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-11-25 17:53:08,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:53:08,011 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2022-11-25 17:53:08,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:53:08,013 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 39 [2022-11-25 17:53:08,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:53:08,017 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-25 17:53:08,018 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-25 17:53:08,018 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1328276070] [2022-11-25 17:53:08,018 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1328276070] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 17:53:08,018 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1383505573] [2022-11-25 17:53:08,018 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 17:53:08,019 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 17:53:08,019 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 [2022-11-25 17:53:08,020 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 17:53:08,030 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-11-25 17:53:08,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:53:08,125 INFO L263 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 10 conjunts are in the unsatisfiable core [2022-11-25 17:53:08,126 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 17:53:08,233 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2022-11-25 17:53:08,233 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 17:53:08,363 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2022-11-25 17:53:08,363 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1383505573] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 17:53:08,363 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 17:53:08,363 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 16 [2022-11-25 17:53:08,364 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1221488528] [2022-11-25 17:53:08,364 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 17:53:08,364 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-11-25 17:53:08,364 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-25 17:53:08,365 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-11-25 17:53:08,365 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2022-11-25 17:53:08,365 INFO L87 Difference]: Start difference. First operand 273 states and 355 transitions. Second operand has 16 states, 16 states have (on average 4.75) internal successors, (76), 16 states have internal predecessors, (76), 6 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2022-11-25 17:53:08,893 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 17:53:08,893 INFO L93 Difference]: Finished difference Result 331 states and 427 transitions. [2022-11-25 17:53:08,893 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-11-25 17:53:08,894 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 4.75) internal successors, (76), 16 states have internal predecessors, (76), 6 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) Word has length 54 [2022-11-25 17:53:08,894 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 17:53:08,896 INFO L225 Difference]: With dead ends: 331 [2022-11-25 17:53:08,896 INFO L226 Difference]: Without dead ends: 281 [2022-11-25 17:53:08,897 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 111 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 90 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=118, Invalid=388, Unknown=0, NotChecked=0, Total=506 [2022-11-25 17:53:08,897 INFO L413 NwaCegarLoop]: 64 mSDtfsCounter, 50 mSDsluCounter, 613 mSDsCounter, 0 mSdLazyCounter, 288 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 677 SdHoareTripleChecker+Invalid, 301 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 288 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-25 17:53:08,898 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [52 Valid, 677 Invalid, 301 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 288 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-25 17:53:08,899 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 281 states. [2022-11-25 17:53:09,008 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 281 to 271. [2022-11-25 17:53:09,008 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 271 states, 258 states have (on average 1.302325581395349) internal successors, (336), 259 states have internal predecessors, (336), 9 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2022-11-25 17:53:09,010 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 271 states to 271 states and 353 transitions. [2022-11-25 17:53:09,010 INFO L78 Accepts]: Start accepts. Automaton has 271 states and 353 transitions. Word has length 54 [2022-11-25 17:53:09,010 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 17:53:09,010 INFO L495 AbstractCegarLoop]: Abstraction has 271 states and 353 transitions. [2022-11-25 17:53:09,011 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 4.75) internal successors, (76), 16 states have internal predecessors, (76), 6 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2022-11-25 17:53:09,011 INFO L276 IsEmpty]: Start isEmpty. Operand 271 states and 353 transitions. [2022-11-25 17:53:09,011 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2022-11-25 17:53:09,012 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 17:53:09,012 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 17:53:09,017 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-11-25 17:53:09,212 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 17:53:09,212 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 17:53:09,213 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 17:53:09,213 INFO L85 PathProgramCache]: Analyzing trace with hash 1379742433, now seen corresponding path program 2 times [2022-11-25 17:53:09,213 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-25 17:53:09,213 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [998278536] [2022-11-25 17:53:09,213 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 17:53:09,213 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 17:53:09,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:53:10,501 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-11-25 17:53:10,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:53:10,504 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-11-25 17:53:10,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:53:10,506 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 3 proven. 15 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-25 17:53:10,506 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-25 17:53:10,507 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [998278536] [2022-11-25 17:53:10,507 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [998278536] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 17:53:10,507 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1440598315] [2022-11-25 17:53:10,507 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-25 17:53:10,507 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 17:53:10,507 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 [2022-11-25 17:53:10,512 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 17:53:10,525 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-11-25 17:53:10,644 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-25 17:53:10,644 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 17:53:10,646 INFO L263 TraceCheckSpWp]: Trace formula consists of 215 conjuncts, 64 conjunts are in the unsatisfiable core [2022-11-25 17:53:10,648 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 17:53:10,797 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-25 17:53:11,233 INFO L321 Elim1Store]: treesize reduction 38, result has 47.9 percent of original size [2022-11-25 17:53:11,233 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 79 treesize of output 70 [2022-11-25 17:53:11,277 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 6 proven. 16 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-11-25 17:53:11,277 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 17:53:11,915 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 6 proven. 4 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2022-11-25 17:53:11,915 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1440598315] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 17:53:11,916 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 17:53:11,916 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 16, 14] total 40 [2022-11-25 17:53:11,916 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1162080278] [2022-11-25 17:53:11,916 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 17:53:11,916 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2022-11-25 17:53:11,917 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-25 17:53:11,917 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2022-11-25 17:53:11,918 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=183, Invalid=1377, Unknown=0, NotChecked=0, Total=1560 [2022-11-25 17:53:11,918 INFO L87 Difference]: Start difference. First operand 271 states and 353 transitions. Second operand has 40 states, 39 states have (on average 2.769230769230769) internal successors, (108), 39 states have internal predecessors, (108), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2022-11-25 17:53:13,937 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 17:53:13,938 INFO L93 Difference]: Finished difference Result 574 states and 769 transitions. [2022-11-25 17:53:13,938 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-11-25 17:53:13,938 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 39 states have (on average 2.769230769230769) internal successors, (108), 39 states have internal predecessors, (108), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 52 [2022-11-25 17:53:13,939 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 17:53:13,941 INFO L225 Difference]: With dead ends: 574 [2022-11-25 17:53:13,941 INFO L226 Difference]: Without dead ends: 513 [2022-11-25 17:53:13,943 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 84 SyntacticMatches, 0 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 702 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=363, Invalid=2499, Unknown=0, NotChecked=0, Total=2862 [2022-11-25 17:53:13,944 INFO L413 NwaCegarLoop]: 92 mSDtfsCounter, 377 mSDsluCounter, 1548 mSDsCounter, 0 mSdLazyCounter, 1433 mSolverCounterSat, 50 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 385 SdHoareTripleChecker+Valid, 1640 SdHoareTripleChecker+Invalid, 1483 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 50 IncrementalHoareTripleChecker+Valid, 1433 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2022-11-25 17:53:13,944 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [385 Valid, 1640 Invalid, 1483 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [50 Valid, 1433 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2022-11-25 17:53:13,945 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 513 states. [2022-11-25 17:53:14,104 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 513 to 310. [2022-11-25 17:53:14,105 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 310 states, 297 states have (on average 1.3097643097643097) internal successors, (389), 298 states have internal predecessors, (389), 9 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2022-11-25 17:53:14,106 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 310 states to 310 states and 406 transitions. [2022-11-25 17:53:14,106 INFO L78 Accepts]: Start accepts. Automaton has 310 states and 406 transitions. Word has length 52 [2022-11-25 17:53:14,107 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 17:53:14,107 INFO L495 AbstractCegarLoop]: Abstraction has 310 states and 406 transitions. [2022-11-25 17:53:14,107 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 39 states have (on average 2.769230769230769) internal successors, (108), 39 states have internal predecessors, (108), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2022-11-25 17:53:14,107 INFO L276 IsEmpty]: Start isEmpty. Operand 310 states and 406 transitions. [2022-11-25 17:53:14,108 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2022-11-25 17:53:14,108 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 17:53:14,109 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 17:53:14,114 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2022-11-25 17:53:14,314 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2022-11-25 17:53:14,314 INFO L420 AbstractCegarLoop]: === Iteration 27 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 17:53:14,314 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 17:53:14,314 INFO L85 PathProgramCache]: Analyzing trace with hash 1170436455, now seen corresponding path program 2 times [2022-11-25 17:53:14,315 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-25 17:53:14,315 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [355623268] [2022-11-25 17:53:14,315 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 17:53:14,315 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 17:53:14,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:53:14,762 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-11-25 17:53:14,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:53:14,765 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-11-25 17:53:14,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:53:14,767 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-11-25 17:53:14,767 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-25 17:53:14,767 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [355623268] [2022-11-25 17:53:14,768 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [355623268] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 17:53:14,768 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [777288416] [2022-11-25 17:53:14,768 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-25 17:53:14,768 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 17:53:14,768 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 [2022-11-25 17:53:14,769 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 17:53:14,791 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-11-25 17:53:14,918 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-25 17:53:14,918 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 17:53:14,920 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 18 conjunts are in the unsatisfiable core [2022-11-25 17:53:14,921 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 17:53:15,100 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-11-25 17:53:15,100 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 17:53:15,344 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-11-25 17:53:15,344 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [777288416] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 17:53:15,344 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 17:53:15,344 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 10] total 23 [2022-11-25 17:53:15,344 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [976414149] [2022-11-25 17:53:15,344 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 17:53:15,345 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-11-25 17:53:15,345 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-25 17:53:15,345 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-11-25 17:53:15,346 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=433, Unknown=0, NotChecked=0, Total=506 [2022-11-25 17:53:15,347 INFO L87 Difference]: Start difference. First operand 310 states and 406 transitions. Second operand has 23 states, 23 states have (on average 3.0869565217391304) internal successors, (71), 23 states have internal predecessors, (71), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-25 17:53:16,100 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 17:53:16,100 INFO L93 Difference]: Finished difference Result 424 states and 552 transitions. [2022-11-25 17:53:16,100 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-11-25 17:53:16,101 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 3.0869565217391304) internal successors, (71), 23 states have internal predecessors, (71), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 53 [2022-11-25 17:53:16,101 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 17:53:16,103 INFO L225 Difference]: With dead ends: 424 [2022-11-25 17:53:16,103 INFO L226 Difference]: Without dead ends: 329 [2022-11-25 17:53:16,103 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 96 SyntacticMatches, 2 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 136 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=146, Invalid=666, Unknown=0, NotChecked=0, Total=812 [2022-11-25 17:53:16,104 INFO L413 NwaCegarLoop]: 85 mSDtfsCounter, 406 mSDsluCounter, 880 mSDsCounter, 0 mSdLazyCounter, 376 mSolverCounterSat, 65 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 406 SdHoareTripleChecker+Valid, 965 SdHoareTripleChecker+Invalid, 441 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 65 IncrementalHoareTripleChecker+Valid, 376 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-25 17:53:16,104 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [406 Valid, 965 Invalid, 441 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [65 Valid, 376 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-25 17:53:16,105 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 329 states. [2022-11-25 17:53:16,194 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 329 to 252. [2022-11-25 17:53:16,194 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 252 states, 239 states have (on average 1.292887029288703) internal successors, (309), 240 states have internal predecessors, (309), 9 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2022-11-25 17:53:16,195 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 252 states to 252 states and 326 transitions. [2022-11-25 17:53:16,196 INFO L78 Accepts]: Start accepts. Automaton has 252 states and 326 transitions. Word has length 53 [2022-11-25 17:53:16,196 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 17:53:16,196 INFO L495 AbstractCegarLoop]: Abstraction has 252 states and 326 transitions. [2022-11-25 17:53:16,196 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 3.0869565217391304) internal successors, (71), 23 states have internal predecessors, (71), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-25 17:53:16,196 INFO L276 IsEmpty]: Start isEmpty. Operand 252 states and 326 transitions. [2022-11-25 17:53:16,197 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2022-11-25 17:53:16,197 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 17:53:16,198 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 17:53:16,209 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2022-11-25 17:53:16,403 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 17:53:16,403 INFO L420 AbstractCegarLoop]: === Iteration 28 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 17:53:16,403 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 17:53:16,404 INFO L85 PathProgramCache]: Analyzing trace with hash -610707989, now seen corresponding path program 3 times [2022-11-25 17:53:16,404 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-25 17:53:16,404 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1597691222] [2022-11-25 17:53:16,404 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 17:53:16,404 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 17:53:16,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:53:16,609 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-11-25 17:53:16,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:53:16,612 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-11-25 17:53:16,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:53:16,614 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-25 17:53:16,614 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-25 17:53:16,614 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1597691222] [2022-11-25 17:53:16,614 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1597691222] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 17:53:16,615 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [472385725] [2022-11-25 17:53:16,615 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 17:53:16,615 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 17:53:16,615 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 [2022-11-25 17:53:16,620 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 17:53:16,624 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-11-25 17:53:17,152 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-11-25 17:53:17,152 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 17:53:17,154 INFO L263 TraceCheckSpWp]: Trace formula consists of 222 conjuncts, 14 conjunts are in the unsatisfiable core [2022-11-25 17:53:17,155 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 17:53:17,328 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 14 proven. 9 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2022-11-25 17:53:17,328 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 17:53:17,521 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 14 proven. 9 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2022-11-25 17:53:17,522 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [472385725] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 17:53:17,522 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 17:53:17,522 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 22 [2022-11-25 17:53:17,522 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [146690860] [2022-11-25 17:53:17,522 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 17:53:17,522 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-11-25 17:53:17,523 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-25 17:53:17,523 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-11-25 17:53:17,523 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=406, Unknown=0, NotChecked=0, Total=462 [2022-11-25 17:53:17,524 INFO L87 Difference]: Start difference. First operand 252 states and 326 transitions. Second operand has 22 states, 22 states have (on average 4.0) internal successors, (88), 21 states have internal predecessors, (88), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-25 17:53:18,241 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 17:53:18,241 INFO L93 Difference]: Finished difference Result 301 states and 385 transitions. [2022-11-25 17:53:18,242 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-11-25 17:53:18,242 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 4.0) internal successors, (88), 21 states have internal predecessors, (88), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 54 [2022-11-25 17:53:18,242 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 17:53:18,243 INFO L225 Difference]: With dead ends: 301 [2022-11-25 17:53:18,243 INFO L226 Difference]: Without dead ends: 267 [2022-11-25 17:53:18,244 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 100 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=114, Invalid=698, Unknown=0, NotChecked=0, Total=812 [2022-11-25 17:53:18,244 INFO L413 NwaCegarLoop]: 78 mSDtfsCounter, 113 mSDsluCounter, 907 mSDsCounter, 0 mSdLazyCounter, 581 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 113 SdHoareTripleChecker+Valid, 985 SdHoareTripleChecker+Invalid, 595 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 581 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-25 17:53:18,245 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [113 Valid, 985 Invalid, 595 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 581 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-25 17:53:18,245 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 267 states. [2022-11-25 17:53:18,348 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 267 to 234. [2022-11-25 17:53:18,349 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 234 states, 221 states have (on average 1.2895927601809956) internal successors, (285), 222 states have internal predecessors, (285), 9 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2022-11-25 17:53:18,350 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 234 states to 234 states and 302 transitions. [2022-11-25 17:53:18,350 INFO L78 Accepts]: Start accepts. Automaton has 234 states and 302 transitions. Word has length 54 [2022-11-25 17:53:18,350 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 17:53:18,350 INFO L495 AbstractCegarLoop]: Abstraction has 234 states and 302 transitions. [2022-11-25 17:53:18,351 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 4.0) internal successors, (88), 21 states have internal predecessors, (88), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-25 17:53:18,351 INFO L276 IsEmpty]: Start isEmpty. Operand 234 states and 302 transitions. [2022-11-25 17:53:18,352 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2022-11-25 17:53:18,352 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 17:53:18,352 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 17:53:18,370 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2022-11-25 17:53:18,560 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2022-11-25 17:53:18,560 INFO L420 AbstractCegarLoop]: === Iteration 29 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 17:53:18,560 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 17:53:18,560 INFO L85 PathProgramCache]: Analyzing trace with hash -1409986660, now seen corresponding path program 1 times [2022-11-25 17:53:18,560 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-25 17:53:18,560 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1103676577] [2022-11-25 17:53:18,561 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 17:53:18,561 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 17:53:18,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:53:18,767 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-11-25 17:53:18,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:53:18,769 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-11-25 17:53:18,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:53:18,771 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 31 [2022-11-25 17:53:18,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:53:18,775 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 42 [2022-11-25 17:53:18,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:53:18,779 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2022-11-25 17:53:18,779 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-25 17:53:18,779 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1103676577] [2022-11-25 17:53:18,779 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1103676577] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 17:53:18,780 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1351734405] [2022-11-25 17:53:18,780 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 17:53:18,780 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 17:53:18,781 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 [2022-11-25 17:53:18,782 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 17:53:18,811 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-11-25 17:53:18,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:53:18,909 INFO L263 TraceCheckSpWp]: Trace formula consists of 198 conjuncts, 14 conjunts are in the unsatisfiable core [2022-11-25 17:53:18,910 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 17:53:19,030 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2022-11-25 17:53:19,031 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 17:53:19,160 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2022-11-25 17:53:19,160 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1351734405] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 17:53:19,161 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 17:53:19,161 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 8, 7] total 18 [2022-11-25 17:53:19,161 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [274106156] [2022-11-25 17:53:19,161 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 17:53:19,161 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-11-25 17:53:19,162 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-25 17:53:19,162 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-11-25 17:53:19,162 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=246, Unknown=0, NotChecked=0, Total=306 [2022-11-25 17:53:19,162 INFO L87 Difference]: Start difference. First operand 234 states and 302 transitions. Second operand has 18 states, 18 states have (on average 3.611111111111111) internal successors, (65), 18 states have internal predecessors, (65), 6 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2022-11-25 17:53:19,748 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 17:53:19,748 INFO L93 Difference]: Finished difference Result 324 states and 415 transitions. [2022-11-25 17:53:19,749 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-11-25 17:53:19,749 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 3.611111111111111) internal successors, (65), 18 states have internal predecessors, (65), 6 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) Word has length 57 [2022-11-25 17:53:19,749 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 17:53:19,751 INFO L225 Difference]: With dead ends: 324 [2022-11-25 17:53:19,751 INFO L226 Difference]: Without dead ends: 258 [2022-11-25 17:53:19,751 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 113 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 122 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=127, Invalid=425, Unknown=0, NotChecked=0, Total=552 [2022-11-25 17:53:19,752 INFO L413 NwaCegarLoop]: 57 mSDtfsCounter, 74 mSDsluCounter, 543 mSDsCounter, 0 mSdLazyCounter, 312 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 76 SdHoareTripleChecker+Valid, 600 SdHoareTripleChecker+Invalid, 336 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 312 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-25 17:53:19,752 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [76 Valid, 600 Invalid, 336 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 312 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-25 17:53:19,753 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 258 states. [2022-11-25 17:53:19,839 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 258 to 224. [2022-11-25 17:53:19,840 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 224 states, 212 states have (on average 1.2830188679245282) internal successors, (272), 213 states have internal predecessors, (272), 8 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2022-11-25 17:53:19,840 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 224 states to 224 states and 287 transitions. [2022-11-25 17:53:19,840 INFO L78 Accepts]: Start accepts. Automaton has 224 states and 287 transitions. Word has length 57 [2022-11-25 17:53:19,841 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 17:53:19,841 INFO L495 AbstractCegarLoop]: Abstraction has 224 states and 287 transitions. [2022-11-25 17:53:19,841 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 3.611111111111111) internal successors, (65), 18 states have internal predecessors, (65), 6 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2022-11-25 17:53:19,841 INFO L276 IsEmpty]: Start isEmpty. Operand 224 states and 287 transitions. [2022-11-25 17:53:19,842 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2022-11-25 17:53:19,842 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 17:53:19,843 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 17:53:19,852 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2022-11-25 17:53:20,048 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2022-11-25 17:53:20,048 INFO L420 AbstractCegarLoop]: === Iteration 30 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 17:53:20,048 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 17:53:20,049 INFO L85 PathProgramCache]: Analyzing trace with hash -1004480119, now seen corresponding path program 3 times [2022-11-25 17:53:20,049 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-25 17:53:20,049 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2140553924] [2022-11-25 17:53:20,049 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 17:53:20,049 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 17:53:20,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:53:20,582 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-11-25 17:53:20,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:53:20,584 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-11-25 17:53:20,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:53:20,586 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 23 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-25 17:53:20,587 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-25 17:53:20,587 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2140553924] [2022-11-25 17:53:20,587 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2140553924] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 17:53:20,587 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1445662649] [2022-11-25 17:53:20,588 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 17:53:20,588 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 17:53:20,588 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 [2022-11-25 17:53:20,592 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 17:53:20,604 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-11-25 17:53:20,754 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-25 17:53:20,755 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 17:53:20,756 INFO L263 TraceCheckSpWp]: Trace formula consists of 209 conjuncts, 19 conjunts are in the unsatisfiable core [2022-11-25 17:53:20,757 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 17:53:21,035 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2022-11-25 17:53:21,036 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 17:53:21,377 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 3 proven. 10 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2022-11-25 17:53:21,377 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1445662649] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 17:53:21,377 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 17:53:21,377 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 11, 11] total 31 [2022-11-25 17:53:21,378 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2072570952] [2022-11-25 17:53:21,378 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 17:53:21,378 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2022-11-25 17:53:21,378 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-25 17:53:21,379 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2022-11-25 17:53:21,379 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=148, Invalid=782, Unknown=0, NotChecked=0, Total=930 [2022-11-25 17:53:21,380 INFO L87 Difference]: Start difference. First operand 224 states and 287 transitions. Second operand has 31 states, 31 states have (on average 3.0) internal successors, (93), 31 states have internal predecessors, (93), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-25 17:53:26,314 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 17:53:26,314 INFO L93 Difference]: Finished difference Result 1047 states and 1365 transitions. [2022-11-25 17:53:26,315 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2022-11-25 17:53:26,315 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 3.0) internal successors, (93), 31 states have internal predecessors, (93), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 55 [2022-11-25 17:53:26,315 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 17:53:26,318 INFO L225 Difference]: With dead ends: 1047 [2022-11-25 17:53:26,318 INFO L226 Difference]: Without dead ends: 890 [2022-11-25 17:53:26,321 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 189 GetRequests, 96 SyntacticMatches, 2 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2147 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=1157, Invalid=7399, Unknown=0, NotChecked=0, Total=8556 [2022-11-25 17:53:26,322 INFO L413 NwaCegarLoop]: 216 mSDtfsCounter, 1843 mSDsluCounter, 2586 mSDsCounter, 0 mSdLazyCounter, 2307 mSolverCounterSat, 256 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1843 SdHoareTripleChecker+Valid, 2802 SdHoareTripleChecker+Invalid, 2563 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 256 IncrementalHoareTripleChecker+Valid, 2307 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2022-11-25 17:53:26,322 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1843 Valid, 2802 Invalid, 2563 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [256 Valid, 2307 Invalid, 0 Unknown, 0 Unchecked, 1.7s Time] [2022-11-25 17:53:26,323 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 890 states. [2022-11-25 17:53:26,420 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 890 to 209. [2022-11-25 17:53:26,421 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 209 states, 197 states have (on average 1.284263959390863) internal successors, (253), 198 states have internal predecessors, (253), 8 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2022-11-25 17:53:26,422 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 209 states to 209 states and 268 transitions. [2022-11-25 17:53:26,422 INFO L78 Accepts]: Start accepts. Automaton has 209 states and 268 transitions. Word has length 55 [2022-11-25 17:53:26,422 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 17:53:26,422 INFO L495 AbstractCegarLoop]: Abstraction has 209 states and 268 transitions. [2022-11-25 17:53:26,423 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 3.0) internal successors, (93), 31 states have internal predecessors, (93), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-25 17:53:26,423 INFO L276 IsEmpty]: Start isEmpty. Operand 209 states and 268 transitions. [2022-11-25 17:53:26,423 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2022-11-25 17:53:26,423 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 17:53:26,423 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 17:53:26,432 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Ended with exit code 0 [2022-11-25 17:53:26,624 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 17:53:26,624 INFO L420 AbstractCegarLoop]: === Iteration 31 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 17:53:26,624 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 17:53:26,624 INFO L85 PathProgramCache]: Analyzing trace with hash -1373602884, now seen corresponding path program 1 times [2022-11-25 17:53:26,624 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-25 17:53:26,624 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1315344119] [2022-11-25 17:53:26,625 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 17:53:26,625 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 17:53:26,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:53:27,450 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-11-25 17:53:27,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:53:27,452 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-11-25 17:53:27,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:53:27,453 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 33 [2022-11-25 17:53:27,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:53:27,456 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 44 [2022-11-25 17:53:27,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:53:27,460 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 2 proven. 12 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-25 17:53:27,460 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-25 17:53:27,460 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1315344119] [2022-11-25 17:53:27,461 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1315344119] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 17:53:27,461 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [672360467] [2022-11-25 17:53:27,461 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 17:53:27,461 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 17:53:27,461 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 [2022-11-25 17:53:27,464 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 17:53:27,487 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-11-25 17:53:27,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:53:27,584 INFO L263 TraceCheckSpWp]: Trace formula consists of 205 conjuncts, 23 conjunts are in the unsatisfiable core [2022-11-25 17:53:27,586 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 17:53:27,868 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2022-11-25 17:53:27,868 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 17:53:28,298 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-11-25 17:53:28,299 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [672360467] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 17:53:28,299 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 17:53:28,299 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 9, 8] total 31 [2022-11-25 17:53:28,299 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1163849815] [2022-11-25 17:53:28,299 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 17:53:28,300 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2022-11-25 17:53:28,300 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-25 17:53:28,300 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2022-11-25 17:53:28,301 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=812, Unknown=0, NotChecked=0, Total=930 [2022-11-25 17:53:28,301 INFO L87 Difference]: Start difference. First operand 209 states and 268 transitions. Second operand has 31 states, 31 states have (on average 2.774193548387097) internal successors, (86), 31 states have internal predecessors, (86), 7 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 6 states have call predecessors, (7), 6 states have call successors, (7) [2022-11-25 17:53:32,959 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 17:53:32,960 INFO L93 Difference]: Finished difference Result 418 states and 535 transitions. [2022-11-25 17:53:32,960 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2022-11-25 17:53:32,961 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 2.774193548387097) internal successors, (86), 31 states have internal predecessors, (86), 7 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 6 states have call predecessors, (7), 6 states have call successors, (7) Word has length 59 [2022-11-25 17:53:32,961 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 17:53:32,963 INFO L225 Difference]: With dead ends: 418 [2022-11-25 17:53:32,963 INFO L226 Difference]: Without dead ends: 311 [2022-11-25 17:53:32,965 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 190 GetRequests, 117 SyntacticMatches, 1 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1268 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=949, Invalid=4453, Unknown=0, NotChecked=0, Total=5402 [2022-11-25 17:53:32,965 INFO L413 NwaCegarLoop]: 73 mSDtfsCounter, 785 mSDsluCounter, 777 mSDsCounter, 0 mSdLazyCounter, 1143 mSolverCounterSat, 175 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 787 SdHoareTripleChecker+Valid, 850 SdHoareTripleChecker+Invalid, 1318 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 175 IncrementalHoareTripleChecker+Valid, 1143 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2022-11-25 17:53:32,965 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [787 Valid, 850 Invalid, 1318 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [175 Valid, 1143 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2022-11-25 17:53:32,966 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 311 states. [2022-11-25 17:53:33,068 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 311 to 229. [2022-11-25 17:53:33,068 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 229 states, 214 states have (on average 1.2523364485981308) internal successors, (268), 215 states have internal predecessors, (268), 11 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-11-25 17:53:33,069 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 229 states to 229 states and 289 transitions. [2022-11-25 17:53:33,069 INFO L78 Accepts]: Start accepts. Automaton has 229 states and 289 transitions. Word has length 59 [2022-11-25 17:53:33,069 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 17:53:33,069 INFO L495 AbstractCegarLoop]: Abstraction has 229 states and 289 transitions. [2022-11-25 17:53:33,069 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 2.774193548387097) internal successors, (86), 31 states have internal predecessors, (86), 7 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 6 states have call predecessors, (7), 6 states have call successors, (7) [2022-11-25 17:53:33,070 INFO L276 IsEmpty]: Start isEmpty. Operand 229 states and 289 transitions. [2022-11-25 17:53:33,070 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2022-11-25 17:53:33,070 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 17:53:33,070 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 17:53:33,075 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2022-11-25 17:53:33,271 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 17:53:33,271 INFO L420 AbstractCegarLoop]: === Iteration 32 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 17:53:33,271 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 17:53:33,271 INFO L85 PathProgramCache]: Analyzing trace with hash 1737992177, now seen corresponding path program 4 times [2022-11-25 17:53:33,272 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-25 17:53:33,272 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2146803455] [2022-11-25 17:53:33,272 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 17:53:33,272 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 17:53:33,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:53:34,806 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-11-25 17:53:34,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:53:34,808 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-11-25 17:53:34,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:53:34,812 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 5 proven. 24 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2022-11-25 17:53:34,812 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-25 17:53:34,812 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2146803455] [2022-11-25 17:53:34,813 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2146803455] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 17:53:34,813 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [885313120] [2022-11-25 17:53:34,813 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 17:53:34,813 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 17:53:34,813 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 [2022-11-25 17:53:34,814 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 17:53:34,843 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2022-11-25 17:53:34,957 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 17:53:34,957 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 17:53:34,960 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 68 conjunts are in the unsatisfiable core [2022-11-25 17:53:34,962 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 17:53:35,609 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 17:53:35,610 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 17:53:35,612 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 17:53:35,615 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-25 17:53:35,616 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 78 treesize of output 39 [2022-11-25 17:53:35,650 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 5 proven. 31 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-25 17:53:35,650 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 17:53:36,357 INFO L321 Elim1Store]: treesize reduction 17, result has 83.5 percent of original size [2022-11-25 17:53:36,357 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 93 [2022-11-25 17:53:37,304 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 4 proven. 16 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2022-11-25 17:53:37,304 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [885313120] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 17:53:37,305 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 17:53:37,305 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 20, 18] total 40 [2022-11-25 17:53:37,305 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [276934345] [2022-11-25 17:53:37,305 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 17:53:37,306 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2022-11-25 17:53:37,306 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-25 17:53:37,307 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2022-11-25 17:53:37,307 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=156, Invalid=1404, Unknown=0, NotChecked=0, Total=1560 [2022-11-25 17:53:37,307 INFO L87 Difference]: Start difference. First operand 229 states and 289 transitions. Second operand has 40 states, 40 states have (on average 2.4) internal successors, (96), 39 states have internal predecessors, (96), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-25 17:53:40,725 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 17:53:40,726 INFO L93 Difference]: Finished difference Result 436 states and 558 transitions. [2022-11-25 17:53:40,726 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2022-11-25 17:53:40,727 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 2.4) internal successors, (96), 39 states have internal predecessors, (96), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 58 [2022-11-25 17:53:40,727 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 17:53:40,729 INFO L225 Difference]: With dead ends: 436 [2022-11-25 17:53:40,729 INFO L226 Difference]: Without dead ends: 412 [2022-11-25 17:53:40,730 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 157 GetRequests, 94 SyntacticMatches, 6 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 744 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=399, Invalid=3023, Unknown=0, NotChecked=0, Total=3422 [2022-11-25 17:53:40,731 INFO L413 NwaCegarLoop]: 107 mSDtfsCounter, 596 mSDsluCounter, 1721 mSDsCounter, 0 mSdLazyCounter, 1590 mSolverCounterSat, 96 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 604 SdHoareTripleChecker+Valid, 1828 SdHoareTripleChecker+Invalid, 1686 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 96 IncrementalHoareTripleChecker+Valid, 1590 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2022-11-25 17:53:40,731 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [604 Valid, 1828 Invalid, 1686 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [96 Valid, 1590 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2022-11-25 17:53:40,735 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 412 states. [2022-11-25 17:53:40,856 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 412 to 241. [2022-11-25 17:53:40,857 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 241 states, 226 states have (on average 1.252212389380531) internal successors, (283), 227 states have internal predecessors, (283), 11 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-11-25 17:53:40,858 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 241 states to 241 states and 304 transitions. [2022-11-25 17:53:40,858 INFO L78 Accepts]: Start accepts. Automaton has 241 states and 304 transitions. Word has length 58 [2022-11-25 17:53:40,858 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 17:53:40,858 INFO L495 AbstractCegarLoop]: Abstraction has 241 states and 304 transitions. [2022-11-25 17:53:40,858 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 2.4) internal successors, (96), 39 states have internal predecessors, (96), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-25 17:53:40,858 INFO L276 IsEmpty]: Start isEmpty. Operand 241 states and 304 transitions. [2022-11-25 17:53:40,859 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2022-11-25 17:53:40,859 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 17:53:40,859 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 17:53:40,864 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2022-11-25 17:53:41,059 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 17:53:41,060 INFO L420 AbstractCegarLoop]: === Iteration 33 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 17:53:41,060 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 17:53:41,060 INFO L85 PathProgramCache]: Analyzing trace with hash 162150685, now seen corresponding path program 5 times [2022-11-25 17:53:41,060 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-25 17:53:41,060 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2029113900] [2022-11-25 17:53:41,060 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 17:53:41,060 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 17:53:41,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:53:42,527 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-11-25 17:53:42,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:53:42,529 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-11-25 17:53:42,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:53:42,531 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 5 proven. 24 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2022-11-25 17:53:42,532 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-25 17:53:42,532 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2029113900] [2022-11-25 17:53:42,532 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2029113900] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 17:53:42,532 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [864240288] [2022-11-25 17:53:42,532 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2022-11-25 17:53:42,532 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 17:53:42,532 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 [2022-11-25 17:53:42,534 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 17:53:42,559 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2022-11-25 17:53:44,200 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2022-11-25 17:53:44,200 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 17:53:44,207 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 93 conjunts are in the unsatisfiable core [2022-11-25 17:53:44,209 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 17:53:45,386 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 5 proven. 24 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2022-11-25 17:53:45,387 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 17:53:48,427 INFO L321 Elim1Store]: treesize reduction 73, result has 86.7 percent of original size [2022-11-25 17:53:48,428 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 0 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 45 case distinctions, treesize of input 104 treesize of output 496 [2022-11-25 17:55:08,166 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 7 proven. 13 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2022-11-25 17:55:08,166 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [864240288] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 17:55:08,167 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 17:55:08,167 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 21, 25] total 56 [2022-11-25 17:55:08,167 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1725476427] [2022-11-25 17:55:08,167 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 17:55:08,168 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2022-11-25 17:55:08,168 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-25 17:55:08,168 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2022-11-25 17:55:08,169 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=404, Invalid=2676, Unknown=0, NotChecked=0, Total=3080 [2022-11-25 17:55:08,170 INFO L87 Difference]: Start difference. First operand 241 states and 304 transitions. Second operand has 56 states, 56 states have (on average 1.9107142857142858) internal successors, (107), 55 states have internal predecessors, (107), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-25 17:55:22,496 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 17:55:22,496 INFO L93 Difference]: Finished difference Result 611 states and 786 transitions. [2022-11-25 17:55:22,497 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 79 states. [2022-11-25 17:55:22,497 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 56 states have (on average 1.9107142857142858) internal successors, (107), 55 states have internal predecessors, (107), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 58 [2022-11-25 17:55:22,498 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 17:55:22,500 INFO L225 Difference]: With dead ends: 611 [2022-11-25 17:55:22,500 INFO L226 Difference]: Without dead ends: 504 [2022-11-25 17:55:22,505 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 203 GetRequests, 82 SyntacticMatches, 2 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3971 ImplicationChecksByTransitivity, 14.9s TimeCoverageRelationStatistics Valid=2000, Invalid=12520, Unknown=0, NotChecked=0, Total=14520 [2022-11-25 17:55:22,506 INFO L413 NwaCegarLoop]: 108 mSDtfsCounter, 813 mSDsluCounter, 1742 mSDsCounter, 0 mSdLazyCounter, 2504 mSolverCounterSat, 126 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 821 SdHoareTripleChecker+Valid, 1850 SdHoareTripleChecker+Invalid, 2630 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 126 IncrementalHoareTripleChecker+Valid, 2504 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.1s IncrementalHoareTripleChecker+Time [2022-11-25 17:55:22,506 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [821 Valid, 1850 Invalid, 2630 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [126 Valid, 2504 Invalid, 0 Unknown, 0 Unchecked, 4.1s Time] [2022-11-25 17:55:22,507 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 504 states. [2022-11-25 17:55:22,671 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 504 to 261. [2022-11-25 17:55:22,672 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 261 states, 246 states have (on average 1.2520325203252032) internal successors, (308), 247 states have internal predecessors, (308), 11 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-11-25 17:55:22,672 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 261 states to 261 states and 329 transitions. [2022-11-25 17:55:22,673 INFO L78 Accepts]: Start accepts. Automaton has 261 states and 329 transitions. Word has length 58 [2022-11-25 17:55:22,673 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 17:55:22,673 INFO L495 AbstractCegarLoop]: Abstraction has 261 states and 329 transitions. [2022-11-25 17:55:22,673 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 56 states, 56 states have (on average 1.9107142857142858) internal successors, (107), 55 states have internal predecessors, (107), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-25 17:55:22,673 INFO L276 IsEmpty]: Start isEmpty. Operand 261 states and 329 transitions. [2022-11-25 17:55:22,673 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2022-11-25 17:55:22,674 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 17:55:22,674 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 17:55:22,679 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2022-11-25 17:55:22,874 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32,26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 17:55:22,874 INFO L420 AbstractCegarLoop]: === Iteration 34 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 17:55:22,875 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 17:55:22,875 INFO L85 PathProgramCache]: Analyzing trace with hash -1550031143, now seen corresponding path program 6 times [2022-11-25 17:55:22,875 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-25 17:55:22,875 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1615031968] [2022-11-25 17:55:22,875 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 17:55:22,875 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 17:55:22,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:55:24,394 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-11-25 17:55:24,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:55:24,396 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-11-25 17:55:24,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:55:24,397 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 5 proven. 24 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2022-11-25 17:55:24,398 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-25 17:55:24,398 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1615031968] [2022-11-25 17:55:24,398 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1615031968] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 17:55:24,398 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [661140249] [2022-11-25 17:55:24,398 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-11-25 17:55:24,398 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 17:55:24,399 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 [2022-11-25 17:55:24,401 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 17:55:24,404 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2022-11-25 17:55:24,664 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2022-11-25 17:55:24,664 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 17:55:24,673 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 67 conjunts are in the unsatisfiable core [2022-11-25 17:55:24,678 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 17:55:25,258 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 17:55:25,261 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 17:55:25,262 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 17:55:25,266 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-25 17:55:25,266 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 82 treesize of output 39 [2022-11-25 17:55:25,306 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 5 proven. 23 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2022-11-25 17:55:25,306 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 17:55:26,107 INFO L321 Elim1Store]: treesize reduction 17, result has 83.5 percent of original size [2022-11-25 17:55:26,108 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 93 [2022-11-25 17:55:27,251 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 2 proven. 18 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2022-11-25 17:55:27,252 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [661140249] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 17:55:27,252 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 17:55:27,252 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 18] total 41 [2022-11-25 17:55:27,252 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [157499013] [2022-11-25 17:55:27,252 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 17:55:27,253 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2022-11-25 17:55:27,253 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-25 17:55:27,254 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2022-11-25 17:55:27,254 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=1482, Unknown=0, NotChecked=0, Total=1640 [2022-11-25 17:55:27,255 INFO L87 Difference]: Start difference. First operand 261 states and 329 transitions. Second operand has 41 states, 41 states have (on average 2.317073170731707) internal successors, (95), 40 states have internal predecessors, (95), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2022-11-25 17:55:31,527 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 17:55:31,527 INFO L93 Difference]: Finished difference Result 469 states and 598 transitions. [2022-11-25 17:55:31,528 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2022-11-25 17:55:31,528 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 2.317073170731707) internal successors, (95), 40 states have internal predecessors, (95), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 58 [2022-11-25 17:55:31,528 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 17:55:31,530 INFO L225 Difference]: With dead ends: 469 [2022-11-25 17:55:31,530 INFO L226 Difference]: Without dead ends: 443 [2022-11-25 17:55:31,531 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 164 GetRequests, 94 SyntacticMatches, 5 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 922 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=514, Invalid=3908, Unknown=0, NotChecked=0, Total=4422 [2022-11-25 17:55:31,532 INFO L413 NwaCegarLoop]: 98 mSDtfsCounter, 446 mSDsluCounter, 1997 mSDsCounter, 0 mSdLazyCounter, 1918 mSolverCounterSat, 66 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 454 SdHoareTripleChecker+Valid, 2095 SdHoareTripleChecker+Invalid, 1984 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 66 IncrementalHoareTripleChecker+Valid, 1918 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2022-11-25 17:55:31,532 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [454 Valid, 2095 Invalid, 1984 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [66 Valid, 1918 Invalid, 0 Unknown, 0 Unchecked, 1.8s Time] [2022-11-25 17:55:31,533 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 443 states. [2022-11-25 17:55:31,695 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 443 to 254. [2022-11-25 17:55:31,696 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 254 states, 239 states have (on average 1.2510460251046025) internal successors, (299), 240 states have internal predecessors, (299), 11 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-11-25 17:55:31,697 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 254 states to 254 states and 320 transitions. [2022-11-25 17:55:31,697 INFO L78 Accepts]: Start accepts. Automaton has 254 states and 320 transitions. Word has length 58 [2022-11-25 17:55:31,697 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 17:55:31,697 INFO L495 AbstractCegarLoop]: Abstraction has 254 states and 320 transitions. [2022-11-25 17:55:31,698 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 2.317073170731707) internal successors, (95), 40 states have internal predecessors, (95), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2022-11-25 17:55:31,698 INFO L276 IsEmpty]: Start isEmpty. Operand 254 states and 320 transitions. [2022-11-25 17:55:31,699 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2022-11-25 17:55:31,699 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 17:55:31,699 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 17:55:31,708 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2022-11-25 17:55:31,905 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2022-11-25 17:55:31,906 INFO L420 AbstractCegarLoop]: === Iteration 35 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 17:55:31,906 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 17:55:31,906 INFO L85 PathProgramCache]: Analyzing trace with hash -1948639156, now seen corresponding path program 2 times [2022-11-25 17:55:31,906 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-25 17:55:31,906 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1013522984] [2022-11-25 17:55:31,906 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 17:55:31,906 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 17:55:31,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:55:32,682 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-11-25 17:55:32,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:55:32,685 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-11-25 17:55:32,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:55:32,687 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 36 [2022-11-25 17:55:32,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:55:32,692 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 47 [2022-11-25 17:55:32,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:55:32,723 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 11 proven. 5 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2022-11-25 17:55:32,723 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-25 17:55:32,724 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1013522984] [2022-11-25 17:55:32,724 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1013522984] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 17:55:32,724 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1839281591] [2022-11-25 17:55:32,724 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-25 17:55:32,724 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 17:55:32,725 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 [2022-11-25 17:55:32,726 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 17:55:32,753 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2022-11-25 17:55:32,860 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-25 17:55:32,860 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 17:55:32,862 INFO L263 TraceCheckSpWp]: Trace formula consists of 215 conjuncts, 43 conjunts are in the unsatisfiable core [2022-11-25 17:55:32,864 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 17:55:33,108 INFO L321 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2022-11-25 17:55:33,108 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 34 treesize of output 10 [2022-11-25 17:55:33,133 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 11 proven. 3 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-11-25 17:55:33,133 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 17:55:33,380 INFO L321 Elim1Store]: treesize reduction 19, result has 80.0 percent of original size [2022-11-25 17:55:33,380 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 35 treesize of output 83 [2022-11-25 17:55:33,667 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 12 proven. 2 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-11-25 17:55:33,667 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1839281591] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 17:55:33,667 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 17:55:33,668 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 11, 10] total 23 [2022-11-25 17:55:33,668 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1694656797] [2022-11-25 17:55:33,668 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 17:55:33,668 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-11-25 17:55:33,669 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-25 17:55:33,669 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-11-25 17:55:33,669 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=412, Unknown=0, NotChecked=0, Total=506 [2022-11-25 17:55:33,670 INFO L87 Difference]: Start difference. First operand 254 states and 320 transitions. Second operand has 23 states, 20 states have (on average 4.05) internal successors, (81), 23 states have internal predecessors, (81), 7 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 4 states have call predecessors, (7), 6 states have call successors, (7) [2022-11-25 17:55:34,689 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 17:55:34,690 INFO L93 Difference]: Finished difference Result 407 states and 517 transitions. [2022-11-25 17:55:34,690 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-11-25 17:55:34,690 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 20 states have (on average 4.05) internal successors, (81), 23 states have internal predecessors, (81), 7 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 4 states have call predecessors, (7), 6 states have call successors, (7) Word has length 62 [2022-11-25 17:55:34,691 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 17:55:34,692 INFO L225 Difference]: With dead ends: 407 [2022-11-25 17:55:34,693 INFO L226 Difference]: Without dead ends: 343 [2022-11-25 17:55:34,693 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 121 SyntacticMatches, 3 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 226 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=168, Invalid=644, Unknown=0, NotChecked=0, Total=812 [2022-11-25 17:55:34,694 INFO L413 NwaCegarLoop]: 84 mSDtfsCounter, 153 mSDsluCounter, 701 mSDsCounter, 0 mSdLazyCounter, 555 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 161 SdHoareTripleChecker+Valid, 785 SdHoareTripleChecker+Invalid, 582 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 555 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-25 17:55:34,694 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [161 Valid, 785 Invalid, 582 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 555 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-25 17:55:34,695 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 343 states. [2022-11-25 17:55:34,896 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 343 to 258. [2022-11-25 17:55:34,896 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 258 states, 242 states have (on average 1.2396694214876034) internal successors, (300), 243 states have internal predecessors, (300), 12 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2022-11-25 17:55:34,897 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 258 states to 258 states and 323 transitions. [2022-11-25 17:55:34,898 INFO L78 Accepts]: Start accepts. Automaton has 258 states and 323 transitions. Word has length 62 [2022-11-25 17:55:34,898 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 17:55:34,898 INFO L495 AbstractCegarLoop]: Abstraction has 258 states and 323 transitions. [2022-11-25 17:55:34,898 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 20 states have (on average 4.05) internal successors, (81), 23 states have internal predecessors, (81), 7 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 4 states have call predecessors, (7), 6 states have call successors, (7) [2022-11-25 17:55:34,899 INFO L276 IsEmpty]: Start isEmpty. Operand 258 states and 323 transitions. [2022-11-25 17:55:34,900 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2022-11-25 17:55:34,900 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 17:55:34,900 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 17:55:34,911 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2022-11-25 17:55:35,112 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2022-11-25 17:55:35,112 INFO L420 AbstractCegarLoop]: === Iteration 36 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 17:55:35,113 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 17:55:35,113 INFO L85 PathProgramCache]: Analyzing trace with hash -158527231, now seen corresponding path program 2 times [2022-11-25 17:55:35,113 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-25 17:55:35,113 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [871336723] [2022-11-25 17:55:35,113 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 17:55:35,114 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 17:55:35,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:55:35,359 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-11-25 17:55:35,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:55:35,361 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-11-25 17:55:35,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:55:35,363 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 0 proven. 35 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2022-11-25 17:55:35,363 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-25 17:55:35,363 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [871336723] [2022-11-25 17:55:35,363 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [871336723] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 17:55:35,363 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1841989080] [2022-11-25 17:55:35,363 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-25 17:55:35,364 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 17:55:35,364 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 [2022-11-25 17:55:35,365 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 17:55:35,368 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2022-11-25 17:55:35,503 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-25 17:55:35,503 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 17:55:35,505 INFO L263 TraceCheckSpWp]: Trace formula consists of 249 conjuncts, 19 conjunts are in the unsatisfiable core [2022-11-25 17:55:35,506 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 17:55:35,783 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 0 proven. 41 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2022-11-25 17:55:35,783 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 17:55:36,138 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 0 proven. 41 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2022-11-25 17:55:36,138 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1841989080] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 17:55:36,138 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 17:55:36,138 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 12, 12] total 31 [2022-11-25 17:55:36,139 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [826146501] [2022-11-25 17:55:36,139 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 17:55:36,139 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2022-11-25 17:55:36,139 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-25 17:55:36,140 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2022-11-25 17:55:36,140 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=833, Unknown=0, NotChecked=0, Total=930 [2022-11-25 17:55:36,140 INFO L87 Difference]: Start difference. First operand 258 states and 323 transitions. Second operand has 31 states, 30 states have (on average 4.066666666666666) internal successors, (122), 30 states have internal predecessors, (122), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-25 17:55:41,774 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 17:55:41,774 INFO L93 Difference]: Finished difference Result 815 states and 1047 transitions. [2022-11-25 17:55:41,774 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 78 states. [2022-11-25 17:55:41,775 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 30 states have (on average 4.066666666666666) internal successors, (122), 30 states have internal predecessors, (122), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 60 [2022-11-25 17:55:41,775 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 17:55:41,776 INFO L225 Difference]: With dead ends: 815 [2022-11-25 17:55:41,776 INFO L226 Difference]: Without dead ends: 608 [2022-11-25 17:55:41,777 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 197 GetRequests, 107 SyntacticMatches, 0 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2007 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=949, Invalid=7423, Unknown=0, NotChecked=0, Total=8372 [2022-11-25 17:55:41,778 INFO L413 NwaCegarLoop]: 108 mSDtfsCounter, 492 mSDsluCounter, 1929 mSDsCounter, 0 mSdLazyCounter, 1771 mSolverCounterSat, 63 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 495 SdHoareTripleChecker+Valid, 2037 SdHoareTripleChecker+Invalid, 1834 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 63 IncrementalHoareTripleChecker+Valid, 1771 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2022-11-25 17:55:41,778 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [495 Valid, 2037 Invalid, 1834 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [63 Valid, 1771 Invalid, 0 Unknown, 0 Unchecked, 1.7s Time] [2022-11-25 17:55:41,779 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 608 states. [2022-11-25 17:55:42,012 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 608 to 485. [2022-11-25 17:55:42,013 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 485 states, 469 states have (on average 1.2537313432835822) internal successors, (588), 470 states have internal predecessors, (588), 12 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2022-11-25 17:55:42,015 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 485 states to 485 states and 611 transitions. [2022-11-25 17:55:42,015 INFO L78 Accepts]: Start accepts. Automaton has 485 states and 611 transitions. Word has length 60 [2022-11-25 17:55:42,015 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 17:55:42,016 INFO L495 AbstractCegarLoop]: Abstraction has 485 states and 611 transitions. [2022-11-25 17:55:42,016 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 30 states have (on average 4.066666666666666) internal successors, (122), 30 states have internal predecessors, (122), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-25 17:55:42,016 INFO L276 IsEmpty]: Start isEmpty. Operand 485 states and 611 transitions. [2022-11-25 17:55:42,017 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2022-11-25 17:55:42,017 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 17:55:42,018 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 17:55:42,024 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2022-11-25 17:55:42,218 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2022-11-25 17:55:42,218 INFO L420 AbstractCegarLoop]: === Iteration 37 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 17:55:42,219 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 17:55:42,219 INFO L85 PathProgramCache]: Analyzing trace with hash -1380776590, now seen corresponding path program 1 times [2022-11-25 17:55:42,219 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-25 17:55:42,219 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1637939290] [2022-11-25 17:55:42,219 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 17:55:42,219 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 17:55:42,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:55:43,222 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-11-25 17:55:43,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:55:43,225 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-11-25 17:55:43,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:55:43,227 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2022-11-25 17:55:43,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:55:43,231 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 48 [2022-11-25 17:55:43,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:55:43,236 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 2 proven. 12 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-11-25 17:55:43,236 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-25 17:55:43,236 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1637939290] [2022-11-25 17:55:43,236 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1637939290] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 17:55:43,237 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [70162906] [2022-11-25 17:55:43,237 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 17:55:43,237 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 17:55:43,237 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 [2022-11-25 17:55:43,239 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 17:55:43,242 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2022-11-25 17:55:43,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:55:43,360 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 64 conjunts are in the unsatisfiable core [2022-11-25 17:55:43,363 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 17:55:44,314 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-25 17:55:44,314 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 38 treesize of output 10 [2022-11-25 17:55:44,358 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 8 proven. 13 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-25 17:55:44,358 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 17:55:44,837 INFO L321 Elim1Store]: treesize reduction 19, result has 81.0 percent of original size [2022-11-25 17:55:44,838 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 37 treesize of output 88 [2022-11-25 17:55:45,768 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 1 proven. 9 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-11-25 17:55:45,768 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [70162906] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 17:55:45,768 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 17:55:45,768 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 19, 16] total 39 [2022-11-25 17:55:45,768 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1827774241] [2022-11-25 17:55:45,768 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 17:55:45,769 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2022-11-25 17:55:45,769 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-25 17:55:45,769 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2022-11-25 17:55:45,770 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=165, Invalid=1317, Unknown=0, NotChecked=0, Total=1482 [2022-11-25 17:55:45,770 INFO L87 Difference]: Start difference. First operand 485 states and 611 transitions. Second operand has 39 states, 38 states have (on average 2.789473684210526) internal successors, (106), 37 states have internal predecessors, (106), 7 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (8), 5 states have call predecessors, (8), 6 states have call successors, (8) [2022-11-25 17:55:47,822 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-25 17:55:49,862 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-25 17:55:51,903 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-25 17:55:53,912 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-25 17:55:56,732 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 17:55:56,732 INFO L93 Difference]: Finished difference Result 703 states and 892 transitions. [2022-11-25 17:55:56,732 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-11-25 17:55:56,733 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 38 states have (on average 2.789473684210526) internal successors, (106), 37 states have internal predecessors, (106), 7 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (8), 5 states have call predecessors, (8), 6 states have call successors, (8) Word has length 63 [2022-11-25 17:55:56,733 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 17:55:56,735 INFO L225 Difference]: With dead ends: 703 [2022-11-25 17:55:56,735 INFO L226 Difference]: Without dead ends: 701 [2022-11-25 17:55:56,736 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 164 GetRequests, 109 SyntacticMatches, 4 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 777 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=343, Invalid=2413, Unknown=0, NotChecked=0, Total=2756 [2022-11-25 17:55:56,736 INFO L413 NwaCegarLoop]: 55 mSDtfsCounter, 435 mSDsluCounter, 872 mSDsCounter, 0 mSdLazyCounter, 1350 mSolverCounterSat, 83 mSolverCounterUnsat, 4 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 9.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 439 SdHoareTripleChecker+Valid, 927 SdHoareTripleChecker+Invalid, 1437 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 83 IncrementalHoareTripleChecker+Valid, 1350 IncrementalHoareTripleChecker+Invalid, 4 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 9.4s IncrementalHoareTripleChecker+Time [2022-11-25 17:55:56,737 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [439 Valid, 927 Invalid, 1437 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [83 Valid, 1350 Invalid, 4 Unknown, 0 Unchecked, 9.4s Time] [2022-11-25 17:55:56,738 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 701 states. [2022-11-25 17:55:57,166 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 701 to 619. [2022-11-25 17:55:57,167 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 619 states, 590 states have (on average 1.259322033898305) internal successors, (743), 594 states have internal predecessors, (743), 21 states have call successors, (21), 7 states have call predecessors, (21), 7 states have return successors, (19), 17 states have call predecessors, (19), 19 states have call successors, (19) [2022-11-25 17:55:57,168 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 619 states to 619 states and 783 transitions. [2022-11-25 17:55:57,168 INFO L78 Accepts]: Start accepts. Automaton has 619 states and 783 transitions. Word has length 63 [2022-11-25 17:55:57,169 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 17:55:57,169 INFO L495 AbstractCegarLoop]: Abstraction has 619 states and 783 transitions. [2022-11-25 17:55:57,169 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 38 states have (on average 2.789473684210526) internal successors, (106), 37 states have internal predecessors, (106), 7 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (8), 5 states have call predecessors, (8), 6 states have call successors, (8) [2022-11-25 17:55:57,169 INFO L276 IsEmpty]: Start isEmpty. Operand 619 states and 783 transitions. [2022-11-25 17:55:57,171 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-11-25 17:55:57,171 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 17:55:57,172 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 17:55:57,178 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2022-11-25 17:55:57,378 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2022-11-25 17:55:57,378 INFO L420 AbstractCegarLoop]: === Iteration 38 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 17:55:57,378 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 17:55:57,378 INFO L85 PathProgramCache]: Analyzing trace with hash 2005256085, now seen corresponding path program 7 times [2022-11-25 17:55:57,378 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-25 17:55:57,379 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [803990627] [2022-11-25 17:55:57,379 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 17:55:57,379 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 17:55:57,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:55:57,845 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-11-25 17:55:57,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:55:57,847 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-11-25 17:55:57,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:55:57,850 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 4 proven. 21 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2022-11-25 17:55:57,850 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-25 17:55:57,850 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [803990627] [2022-11-25 17:55:57,850 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [803990627] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 17:55:57,851 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1212634133] [2022-11-25 17:55:57,851 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-25 17:55:57,851 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 17:55:57,851 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 [2022-11-25 17:55:57,853 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 17:55:57,883 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2022-11-25 17:55:58,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:55:58,006 INFO L263 TraceCheckSpWp]: Trace formula consists of 247 conjuncts, 30 conjunts are in the unsatisfiable core [2022-11-25 17:55:58,008 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 17:55:58,310 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 4 proven. 30 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-11-25 17:55:58,310 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 17:55:58,568 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 4 proven. 21 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2022-11-25 17:55:58,568 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1212634133] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 17:55:58,568 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 17:55:58,568 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 15, 12] total 28 [2022-11-25 17:55:58,569 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1307778185] [2022-11-25 17:55:58,569 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 17:55:58,569 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-11-25 17:55:58,569 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-25 17:55:58,570 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-11-25 17:55:58,570 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=668, Unknown=0, NotChecked=0, Total=756 [2022-11-25 17:55:58,570 INFO L87 Difference]: Start difference. First operand 619 states and 783 transitions. Second operand has 28 states, 28 states have (on average 2.7857142857142856) internal successors, (78), 28 states have internal predecessors, (78), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-25 17:56:01,360 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 17:56:01,360 INFO L93 Difference]: Finished difference Result 1685 states and 2170 transitions. [2022-11-25 17:56:01,361 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2022-11-25 17:56:01,361 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 2.7857142857142856) internal successors, (78), 28 states have internal predecessors, (78), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 61 [2022-11-25 17:56:01,361 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 17:56:01,367 INFO L225 Difference]: With dead ends: 1685 [2022-11-25 17:56:01,368 INFO L226 Difference]: Without dead ends: 1263 [2022-11-25 17:56:01,368 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 107 SyntacticMatches, 5 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 435 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=359, Invalid=2091, Unknown=0, NotChecked=0, Total=2450 [2022-11-25 17:56:01,369 INFO L413 NwaCegarLoop]: 124 mSDtfsCounter, 1062 mSDsluCounter, 1527 mSDsCounter, 0 mSdLazyCounter, 1083 mSolverCounterSat, 124 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1065 SdHoareTripleChecker+Valid, 1651 SdHoareTripleChecker+Invalid, 1207 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 124 IncrementalHoareTripleChecker+Valid, 1083 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-11-25 17:56:01,369 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1065 Valid, 1651 Invalid, 1207 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [124 Valid, 1083 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-11-25 17:56:01,371 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1263 states. [2022-11-25 17:56:01,866 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1263 to 703. [2022-11-25 17:56:01,867 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 703 states, 674 states have (on average 1.268545994065282) internal successors, (855), 678 states have internal predecessors, (855), 21 states have call successors, (21), 7 states have call predecessors, (21), 7 states have return successors, (19), 17 states have call predecessors, (19), 19 states have call successors, (19) [2022-11-25 17:56:01,869 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 703 states to 703 states and 895 transitions. [2022-11-25 17:56:01,869 INFO L78 Accepts]: Start accepts. Automaton has 703 states and 895 transitions. Word has length 61 [2022-11-25 17:56:01,870 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 17:56:01,870 INFO L495 AbstractCegarLoop]: Abstraction has 703 states and 895 transitions. [2022-11-25 17:56:01,870 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 2.7857142857142856) internal successors, (78), 28 states have internal predecessors, (78), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-25 17:56:01,870 INFO L276 IsEmpty]: Start isEmpty. Operand 703 states and 895 transitions. [2022-11-25 17:56:01,872 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2022-11-25 17:56:01,872 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 17:56:01,872 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 17:56:01,878 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2022-11-25 17:56:02,078 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2022-11-25 17:56:02,079 INFO L420 AbstractCegarLoop]: === Iteration 39 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 17:56:02,079 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 17:56:02,079 INFO L85 PathProgramCache]: Analyzing trace with hash -1579304483, now seen corresponding path program 3 times [2022-11-25 17:56:02,079 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-25 17:56:02,079 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1758445899] [2022-11-25 17:56:02,079 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 17:56:02,080 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 17:56:02,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:56:03,502 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-11-25 17:56:03,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:56:03,506 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-11-25 17:56:03,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:56:03,508 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 5 proven. 34 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2022-11-25 17:56:03,508 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-25 17:56:03,509 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1758445899] [2022-11-25 17:56:03,509 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1758445899] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 17:56:03,509 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [264587138] [2022-11-25 17:56:03,509 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 17:56:03,509 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 17:56:03,509 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 [2022-11-25 17:56:03,512 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 17:56:03,548 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2022-11-25 17:56:03,910 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-25 17:56:03,910 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 17:56:03,914 INFO L263 TraceCheckSpWp]: Trace formula consists of 244 conjuncts, 60 conjunts are in the unsatisfiable core [2022-11-25 17:56:03,918 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 17:56:04,197 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-25 17:56:04,969 INFO L321 Elim1Store]: treesize reduction 3, result has 75.0 percent of original size [2022-11-25 17:56:04,970 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 31 treesize of output 20 [2022-11-25 17:56:05,013 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 5 proven. 31 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2022-11-25 17:56:05,013 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 17:56:06,100 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 5 proven. 19 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2022-11-25 17:56:06,100 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [264587138] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 17:56:06,100 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 17:56:06,101 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 19, 13] total 45 [2022-11-25 17:56:06,101 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [249378189] [2022-11-25 17:56:06,101 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 17:56:06,101 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2022-11-25 17:56:06,101 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-25 17:56:06,102 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2022-11-25 17:56:06,102 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=215, Invalid=1765, Unknown=0, NotChecked=0, Total=1980 [2022-11-25 17:56:06,103 INFO L87 Difference]: Start difference. First operand 703 states and 895 transitions. Second operand has 45 states, 45 states have (on average 2.8) internal successors, (126), 44 states have internal predecessors, (126), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-11-25 17:56:11,002 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 17:56:11,002 INFO L93 Difference]: Finished difference Result 1049 states and 1355 transitions. [2022-11-25 17:56:11,002 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2022-11-25 17:56:11,002 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 2.8) internal successors, (126), 44 states have internal predecessors, (126), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 62 [2022-11-25 17:56:11,003 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 17:56:11,005 INFO L225 Difference]: With dead ends: 1049 [2022-11-25 17:56:11,005 INFO L226 Difference]: Without dead ends: 953 [2022-11-25 17:56:11,006 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 102 SyntacticMatches, 0 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1281 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=708, Invalid=5298, Unknown=0, NotChecked=0, Total=6006 [2022-11-25 17:56:11,006 INFO L413 NwaCegarLoop]: 89 mSDtfsCounter, 651 mSDsluCounter, 1663 mSDsCounter, 0 mSdLazyCounter, 2387 mSolverCounterSat, 143 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 651 SdHoareTripleChecker+Valid, 1752 SdHoareTripleChecker+Invalid, 2530 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 143 IncrementalHoareTripleChecker+Valid, 2387 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.0s IncrementalHoareTripleChecker+Time [2022-11-25 17:56:11,007 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [651 Valid, 1752 Invalid, 2530 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [143 Valid, 2387 Invalid, 0 Unknown, 0 Unchecked, 2.0s Time] [2022-11-25 17:56:11,008 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 953 states. [2022-11-25 17:56:11,549 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 953 to 761. [2022-11-25 17:56:11,550 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 761 states, 732 states have (on average 1.2745901639344261) internal successors, (933), 736 states have internal predecessors, (933), 21 states have call successors, (21), 7 states have call predecessors, (21), 7 states have return successors, (19), 17 states have call predecessors, (19), 19 states have call successors, (19) [2022-11-25 17:56:11,552 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 761 states to 761 states and 973 transitions. [2022-11-25 17:56:11,552 INFO L78 Accepts]: Start accepts. Automaton has 761 states and 973 transitions. Word has length 62 [2022-11-25 17:56:11,553 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 17:56:11,553 INFO L495 AbstractCegarLoop]: Abstraction has 761 states and 973 transitions. [2022-11-25 17:56:11,553 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 45 states have (on average 2.8) internal successors, (126), 44 states have internal predecessors, (126), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-11-25 17:56:11,553 INFO L276 IsEmpty]: Start isEmpty. Operand 761 states and 973 transitions. [2022-11-25 17:56:11,555 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2022-11-25 17:56:11,555 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 17:56:11,556 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 17:56:11,563 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Ended with exit code 0 [2022-11-25 17:56:11,762 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2022-11-25 17:56:11,762 INFO L420 AbstractCegarLoop]: === Iteration 40 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 17:56:11,762 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 17:56:11,763 INFO L85 PathProgramCache]: Analyzing trace with hash -892086793, now seen corresponding path program 8 times [2022-11-25 17:56:11,763 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-25 17:56:11,763 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [997678118] [2022-11-25 17:56:11,763 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 17:56:11,763 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 17:56:11,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:56:12,781 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-11-25 17:56:12,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:56:12,784 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-11-25 17:56:12,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:56:12,785 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 53 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-25 17:56:12,786 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-25 17:56:12,786 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [997678118] [2022-11-25 17:56:12,786 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [997678118] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 17:56:12,786 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [97835912] [2022-11-25 17:56:12,786 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-25 17:56:12,786 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 17:56:12,786 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 [2022-11-25 17:56:12,787 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 17:56:12,790 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2022-11-25 17:56:12,974 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-25 17:56:12,974 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 17:56:12,977 INFO L263 TraceCheckSpWp]: Trace formula consists of 256 conjuncts, 22 conjunts are in the unsatisfiable core [2022-11-25 17:56:12,979 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 17:56:13,335 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 4 proven. 21 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2022-11-25 17:56:13,335 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 17:56:13,780 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 4 proven. 21 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2022-11-25 17:56:13,781 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [97835912] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 17:56:13,781 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 17:56:13,781 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 12, 12] total 39 [2022-11-25 17:56:13,781 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [27326246] [2022-11-25 17:56:13,781 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 17:56:13,782 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2022-11-25 17:56:13,782 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-25 17:56:13,782 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2022-11-25 17:56:13,783 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=1363, Unknown=0, NotChecked=0, Total=1482 [2022-11-25 17:56:13,783 INFO L87 Difference]: Start difference. First operand 761 states and 973 transitions. Second operand has 39 states, 39 states have (on average 2.717948717948718) internal successors, (106), 39 states have internal predecessors, (106), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-25 17:56:40,358 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 17:56:40,358 INFO L93 Difference]: Finished difference Result 3577 states and 4673 transitions. [2022-11-25 17:56:40,360 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 149 states. [2022-11-25 17:56:40,360 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 2.717948717948718) internal successors, (106), 39 states have internal predecessors, (106), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 63 [2022-11-25 17:56:40,360 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 17:56:40,373 INFO L225 Difference]: With dead ends: 3577 [2022-11-25 17:56:40,374 INFO L226 Difference]: Without dead ends: 3386 [2022-11-25 17:56:40,378 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 287 GetRequests, 112 SyntacticMatches, 2 SemanticMatches, 173 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10041 ImplicationChecksByTransitivity, 19.1s TimeCoverageRelationStatistics Valid=2804, Invalid=27646, Unknown=0, NotChecked=0, Total=30450 [2022-11-25 17:56:40,379 INFO L413 NwaCegarLoop]: 306 mSDtfsCounter, 3491 mSDsluCounter, 5617 mSDsCounter, 0 mSdLazyCounter, 4642 mSolverCounterSat, 623 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3495 SdHoareTripleChecker+Valid, 5923 SdHoareTripleChecker+Invalid, 5265 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 623 IncrementalHoareTripleChecker+Valid, 4642 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.1s IncrementalHoareTripleChecker+Time [2022-11-25 17:56:40,379 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3495 Valid, 5923 Invalid, 5265 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [623 Valid, 4642 Invalid, 0 Unknown, 0 Unchecked, 5.1s Time] [2022-11-25 17:56:40,382 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3386 states. [2022-11-25 17:56:40,982 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3386 to 673. [2022-11-25 17:56:40,983 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 673 states, 644 states have (on average 1.2826086956521738) internal successors, (826), 648 states have internal predecessors, (826), 21 states have call successors, (21), 7 states have call predecessors, (21), 7 states have return successors, (19), 17 states have call predecessors, (19), 19 states have call successors, (19) [2022-11-25 17:56:40,985 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 673 states to 673 states and 866 transitions. [2022-11-25 17:56:40,986 INFO L78 Accepts]: Start accepts. Automaton has 673 states and 866 transitions. Word has length 63 [2022-11-25 17:56:40,986 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 17:56:40,986 INFO L495 AbstractCegarLoop]: Abstraction has 673 states and 866 transitions. [2022-11-25 17:56:40,986 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 2.717948717948718) internal successors, (106), 39 states have internal predecessors, (106), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-25 17:56:40,987 INFO L276 IsEmpty]: Start isEmpty. Operand 673 states and 866 transitions. [2022-11-25 17:56:40,989 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2022-11-25 17:56:40,989 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 17:56:40,989 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 5, 5, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 17:56:41,001 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Forceful destruction successful, exit code 0 [2022-11-25 17:56:41,195 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2022-11-25 17:56:41,196 INFO L420 AbstractCegarLoop]: === Iteration 41 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 17:56:41,196 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 17:56:41,196 INFO L85 PathProgramCache]: Analyzing trace with hash -2033592005, now seen corresponding path program 3 times [2022-11-25 17:56:41,196 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-25 17:56:41,196 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1621152540] [2022-11-25 17:56:41,197 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 17:56:41,197 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 17:56:41,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:56:41,487 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-11-25 17:56:41,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:56:41,489 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-11-25 17:56:41,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:56:41,491 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 51 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2022-11-25 17:56:41,491 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-25 17:56:41,491 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1621152540] [2022-11-25 17:56:41,492 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1621152540] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 17:56:41,493 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1727535068] [2022-11-25 17:56:41,493 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 17:56:41,493 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 17:56:41,493 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 [2022-11-25 17:56:41,495 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 17:56:41,530 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2022-11-25 17:56:41,875 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-25 17:56:41,875 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 17:56:41,878 INFO L263 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 26 conjunts are in the unsatisfiable core [2022-11-25 17:56:41,880 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 17:56:42,300 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 79 trivial. 0 not checked. [2022-11-25 17:56:42,301 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 17:56:43,129 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 82 trivial. 0 not checked. [2022-11-25 17:56:43,129 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1727535068] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 17:56:43,129 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 17:56:43,129 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 11] total 31 [2022-11-25 17:56:43,129 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [750148435] [2022-11-25 17:56:43,129 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 17:56:43,130 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2022-11-25 17:56:43,130 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-25 17:56:43,130 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2022-11-25 17:56:43,131 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=833, Unknown=0, NotChecked=0, Total=930 [2022-11-25 17:56:43,131 INFO L87 Difference]: Start difference. First operand 673 states and 866 transitions. Second operand has 31 states, 30 states have (on average 3.4) internal successors, (102), 30 states have internal predecessors, (102), 4 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-11-25 17:56:48,024 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 17:56:48,025 INFO L93 Difference]: Finished difference Result 863 states and 1110 transitions. [2022-11-25 17:56:48,028 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2022-11-25 17:56:48,028 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 30 states have (on average 3.4) internal successors, (102), 30 states have internal predecessors, (102), 4 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 67 [2022-11-25 17:56:48,028 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 17:56:48,031 INFO L225 Difference]: With dead ends: 863 [2022-11-25 17:56:48,032 INFO L226 Difference]: Without dead ends: 807 [2022-11-25 17:56:48,033 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 198 GetRequests, 125 SyntacticMatches, 0 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 953 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=717, Invalid=4833, Unknown=0, NotChecked=0, Total=5550 [2022-11-25 17:56:48,034 INFO L413 NwaCegarLoop]: 64 mSDtfsCounter, 1185 mSDsluCounter, 1036 mSDsCounter, 0 mSdLazyCounter, 1275 mSolverCounterSat, 79 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1185 SdHoareTripleChecker+Valid, 1100 SdHoareTripleChecker+Invalid, 1354 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 79 IncrementalHoareTripleChecker+Valid, 1275 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2022-11-25 17:56:48,034 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1185 Valid, 1100 Invalid, 1354 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [79 Valid, 1275 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2022-11-25 17:56:48,035 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 807 states. [2022-11-25 17:56:48,558 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 807 to 687. [2022-11-25 17:56:48,558 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 687 states, 658 states have (on average 1.2826747720364742) internal successors, (844), 662 states have internal predecessors, (844), 21 states have call successors, (21), 7 states have call predecessors, (21), 7 states have return successors, (19), 17 states have call predecessors, (19), 19 states have call successors, (19) [2022-11-25 17:56:48,560 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 687 states to 687 states and 884 transitions. [2022-11-25 17:56:48,560 INFO L78 Accepts]: Start accepts. Automaton has 687 states and 884 transitions. Word has length 67 [2022-11-25 17:56:48,560 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 17:56:48,560 INFO L495 AbstractCegarLoop]: Abstraction has 687 states and 884 transitions. [2022-11-25 17:56:48,560 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 30 states have (on average 3.4) internal successors, (102), 30 states have internal predecessors, (102), 4 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-11-25 17:56:48,560 INFO L276 IsEmpty]: Start isEmpty. Operand 687 states and 884 transitions. [2022-11-25 17:56:48,562 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2022-11-25 17:56:48,562 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 17:56:48,562 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 17:56:48,574 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Forceful destruction successful, exit code 0 [2022-11-25 17:56:48,769 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 17:56:48,769 INFO L420 AbstractCegarLoop]: === Iteration 42 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 17:56:48,769 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 17:56:48,769 INFO L85 PathProgramCache]: Analyzing trace with hash -1736078367, now seen corresponding path program 9 times [2022-11-25 17:56:48,769 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-25 17:56:48,769 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1081274835] [2022-11-25 17:56:48,770 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 17:56:48,770 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 17:56:48,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:56:50,442 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-11-25 17:56:50,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:56:50,445 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-11-25 17:56:50,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:56:50,447 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 7 proven. 46 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-11-25 17:56:50,448 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-25 17:56:50,448 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1081274835] [2022-11-25 17:56:50,448 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1081274835] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 17:56:50,448 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1385126057] [2022-11-25 17:56:50,448 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 17:56:50,448 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 17:56:50,448 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 [2022-11-25 17:56:50,449 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 17:56:50,450 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2022-11-25 17:56:53,580 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-11-25 17:56:53,581 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 17:56:53,587 INFO L263 TraceCheckSpWp]: Trace formula consists of 275 conjuncts, 83 conjunts are in the unsatisfiable core [2022-11-25 17:56:53,590 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 17:56:55,288 INFO L321 Elim1Store]: treesize reduction 40, result has 49.4 percent of original size [2022-11-25 17:56:55,288 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 83 treesize of output 74 [2022-11-25 17:56:55,407 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 10 proven. 59 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-11-25 17:56:55,408 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 17:56:57,212 INFO L321 Elim1Store]: treesize reduction 17, result has 83.5 percent of original size [2022-11-25 17:56:57,213 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 93 [2022-11-25 17:56:58,920 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 2 proven. 36 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-11-25 17:56:58,920 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1385126057] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 17:56:58,920 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 17:56:58,921 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 29, 22] total 68 [2022-11-25 17:56:58,921 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [451429670] [2022-11-25 17:56:58,921 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 17:56:58,921 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 68 states [2022-11-25 17:56:58,921 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-25 17:56:58,922 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2022-11-25 17:56:58,923 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=330, Invalid=4226, Unknown=0, NotChecked=0, Total=4556 [2022-11-25 17:56:58,923 INFO L87 Difference]: Start difference. First operand 687 states and 884 transitions. Second operand has 68 states, 67 states have (on average 2.1791044776119404) internal successors, (146), 67 states have internal predecessors, (146), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2022-11-25 17:57:24,818 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 17:57:24,818 INFO L93 Difference]: Finished difference Result 2542 states and 3322 transitions. [2022-11-25 17:57:24,819 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 101 states. [2022-11-25 17:57:24,819 INFO L78 Accepts]: Start accepts. Automaton has has 68 states, 67 states have (on average 2.1791044776119404) internal successors, (146), 67 states have internal predecessors, (146), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 68 [2022-11-25 17:57:24,819 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 17:57:24,827 INFO L225 Difference]: With dead ends: 2542 [2022-11-25 17:57:24,827 INFO L226 Difference]: Without dead ends: 2484 [2022-11-25 17:57:24,830 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 256 GetRequests, 94 SyntacticMatches, 0 SemanticMatches, 162 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7386 ImplicationChecksByTransitivity, 16.0s TimeCoverageRelationStatistics Valid=2222, Invalid=24510, Unknown=0, NotChecked=0, Total=26732 [2022-11-25 17:57:24,831 INFO L413 NwaCegarLoop]: 215 mSDtfsCounter, 2138 mSDsluCounter, 5707 mSDsCounter, 0 mSdLazyCounter, 8829 mSolverCounterSat, 470 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 9.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2138 SdHoareTripleChecker+Valid, 5922 SdHoareTripleChecker+Invalid, 9299 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 470 IncrementalHoareTripleChecker+Valid, 8829 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 10.7s IncrementalHoareTripleChecker+Time [2022-11-25 17:57:24,831 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2138 Valid, 5922 Invalid, 9299 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [470 Valid, 8829 Invalid, 0 Unknown, 0 Unchecked, 10.7s Time] [2022-11-25 17:57:24,833 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2484 states. [2022-11-25 17:57:25,410 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2484 to 711. [2022-11-25 17:57:25,411 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 711 states, 682 states have (on average 1.281524926686217) internal successors, (874), 686 states have internal predecessors, (874), 21 states have call successors, (21), 7 states have call predecessors, (21), 7 states have return successors, (19), 17 states have call predecessors, (19), 19 states have call successors, (19) [2022-11-25 17:57:25,412 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 711 states to 711 states and 914 transitions. [2022-11-25 17:57:25,412 INFO L78 Accepts]: Start accepts. Automaton has 711 states and 914 transitions. Word has length 68 [2022-11-25 17:57:25,413 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 17:57:25,413 INFO L495 AbstractCegarLoop]: Abstraction has 711 states and 914 transitions. [2022-11-25 17:57:25,413 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 68 states, 67 states have (on average 2.1791044776119404) internal successors, (146), 67 states have internal predecessors, (146), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2022-11-25 17:57:25,413 INFO L276 IsEmpty]: Start isEmpty. Operand 711 states and 914 transitions. [2022-11-25 17:57:25,415 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2022-11-25 17:57:25,415 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 17:57:25,415 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 17:57:25,422 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Forceful destruction successful, exit code 0 [2022-11-25 17:57:25,622 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41,35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 17:57:25,622 INFO L420 AbstractCegarLoop]: === Iteration 43 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 17:57:25,622 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 17:57:25,623 INFO L85 PathProgramCache]: Analyzing trace with hash 1104262353, now seen corresponding path program 10 times [2022-11-25 17:57:25,623 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-25 17:57:25,623 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1917974023] [2022-11-25 17:57:25,623 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 17:57:25,623 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 17:57:25,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:57:27,262 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-11-25 17:57:27,263 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:57:27,264 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-11-25 17:57:27,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:57:27,266 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 7 proven. 46 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-11-25 17:57:27,267 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-25 17:57:27,267 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1917974023] [2022-11-25 17:57:27,267 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1917974023] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 17:57:27,267 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2129163543] [2022-11-25 17:57:27,267 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 17:57:27,267 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 17:57:27,268 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 [2022-11-25 17:57:27,269 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 17:57:27,298 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2022-11-25 17:57:27,477 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 17:57:27,477 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 17:57:27,479 INFO L263 TraceCheckSpWp]: Trace formula consists of 275 conjuncts, 79 conjunts are in the unsatisfiable core [2022-11-25 17:57:27,481 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 17:57:28,881 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 17:57:28,884 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 17:57:28,886 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 17:57:28,887 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 17:57:28,891 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-25 17:57:28,892 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 84 treesize of output 31 [2022-11-25 17:57:28,945 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 10 proven. 61 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-25 17:57:28,945 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 17:57:29,647 INFO L321 Elim1Store]: treesize reduction 17, result has 83.5 percent of original size [2022-11-25 17:57:29,647 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 93 [2022-11-25 17:57:31,236 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 7 proven. 31 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-11-25 17:57:31,237 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2129163543] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 17:57:31,237 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 17:57:31,237 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 27, 17] total 52 [2022-11-25 17:57:31,237 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [538928411] [2022-11-25 17:57:31,237 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 17:57:31,238 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2022-11-25 17:57:31,238 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-25 17:57:31,239 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2022-11-25 17:57:31,239 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=223, Invalid=2429, Unknown=0, NotChecked=0, Total=2652 [2022-11-25 17:57:31,239 INFO L87 Difference]: Start difference. First operand 711 states and 914 transitions. Second operand has 52 states, 52 states have (on average 2.4615384615384617) internal successors, (128), 51 states have internal predecessors, (128), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2022-11-25 17:57:37,090 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 17:57:37,091 INFO L93 Difference]: Finished difference Result 1222 states and 1586 transitions. [2022-11-25 17:57:37,091 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2022-11-25 17:57:37,091 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 2.4615384615384617) internal successors, (128), 51 states have internal predecessors, (128), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 68 [2022-11-25 17:57:37,092 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 17:57:37,094 INFO L225 Difference]: With dead ends: 1222 [2022-11-25 17:57:37,094 INFO L226 Difference]: Without dead ends: 1060 [2022-11-25 17:57:37,095 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 184 GetRequests, 104 SyntacticMatches, 6 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1527 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=568, Invalid=5132, Unknown=0, NotChecked=0, Total=5700 [2022-11-25 17:57:37,095 INFO L413 NwaCegarLoop]: 94 mSDtfsCounter, 598 mSDsluCounter, 2127 mSDsCounter, 0 mSdLazyCounter, 3235 mSolverCounterSat, 95 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 598 SdHoareTripleChecker+Valid, 2221 SdHoareTripleChecker+Invalid, 3330 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 95 IncrementalHoareTripleChecker+Valid, 3235 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.0s IncrementalHoareTripleChecker+Time [2022-11-25 17:57:37,095 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [598 Valid, 2221 Invalid, 3330 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [95 Valid, 3235 Invalid, 0 Unknown, 0 Unchecked, 3.0s Time] [2022-11-25 17:57:37,097 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1060 states. [2022-11-25 17:57:37,619 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1060 to 741. [2022-11-25 17:57:37,620 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 741 states, 712 states have (on average 1.2808988764044944) internal successors, (912), 716 states have internal predecessors, (912), 21 states have call successors, (21), 7 states have call predecessors, (21), 7 states have return successors, (19), 17 states have call predecessors, (19), 19 states have call successors, (19) [2022-11-25 17:57:37,621 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 741 states to 741 states and 952 transitions. [2022-11-25 17:57:37,621 INFO L78 Accepts]: Start accepts. Automaton has 741 states and 952 transitions. Word has length 68 [2022-11-25 17:57:37,622 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 17:57:37,622 INFO L495 AbstractCegarLoop]: Abstraction has 741 states and 952 transitions. [2022-11-25 17:57:37,622 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 52 states have (on average 2.4615384615384617) internal successors, (128), 51 states have internal predecessors, (128), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2022-11-25 17:57:37,622 INFO L276 IsEmpty]: Start isEmpty. Operand 741 states and 952 transitions. [2022-11-25 17:57:37,624 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2022-11-25 17:57:37,624 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 17:57:37,625 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 17:57:37,631 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Ended with exit code 0 [2022-11-25 17:57:37,831 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable42 [2022-11-25 17:57:37,831 INFO L420 AbstractCegarLoop]: === Iteration 44 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 17:57:37,832 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 17:57:37,832 INFO L85 PathProgramCache]: Analyzing trace with hash -797080539, now seen corresponding path program 11 times [2022-11-25 17:57:37,832 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-25 17:57:37,832 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [338743536] [2022-11-25 17:57:37,832 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 17:57:37,832 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 17:57:37,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:57:39,253 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-11-25 17:57:39,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:57:39,255 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-11-25 17:57:39,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:57:39,258 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 7 proven. 46 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-11-25 17:57:39,258 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-25 17:57:39,258 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [338743536] [2022-11-25 17:57:39,258 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [338743536] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 17:57:39,258 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1269023270] [2022-11-25 17:57:39,258 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2022-11-25 17:57:39,258 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 17:57:39,259 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 [2022-11-25 17:57:39,260 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 17:57:39,262 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2022-11-25 17:57:43,550 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2022-11-25 17:57:43,551 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 17:57:43,557 INFO L263 TraceCheckSpWp]: Trace formula consists of 275 conjuncts, 103 conjunts are in the unsatisfiable core [2022-11-25 17:57:43,561 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 17:57:43,944 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2022-11-25 17:57:44,008 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2022-11-25 17:57:44,067 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-25 17:57:45,714 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 13 proven. 52 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-25 17:57:45,714 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 17:57:51,727 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 4 proven. 34 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-11-25 17:57:51,727 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1269023270] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 17:57:51,727 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 17:57:51,727 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 27, 24] total 68 [2022-11-25 17:57:51,727 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [987839321] [2022-11-25 17:57:51,728 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 17:57:51,728 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 68 states [2022-11-25 17:57:51,728 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-25 17:57:51,729 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2022-11-25 17:57:51,729 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=521, Invalid=4035, Unknown=0, NotChecked=0, Total=4556 [2022-11-25 17:57:51,730 INFO L87 Difference]: Start difference. First operand 741 states and 952 transitions. Second operand has 68 states, 68 states have (on average 2.1176470588235294) internal successors, (144), 66 states have internal predecessors, (144), 4 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-11-25 17:58:52,883 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 17:58:52,883 INFO L93 Difference]: Finished difference Result 2456 states and 3209 transitions. [2022-11-25 17:58:52,883 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 128 states. [2022-11-25 17:58:52,884 INFO L78 Accepts]: Start accepts. Automaton has has 68 states, 68 states have (on average 2.1176470588235294) internal successors, (144), 66 states have internal predecessors, (144), 4 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 68 [2022-11-25 17:58:52,884 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 17:58:52,888 INFO L225 Difference]: With dead ends: 2456 [2022-11-25 17:58:52,889 INFO L226 Difference]: Without dead ends: 2279 [2022-11-25 17:58:52,890 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 269 GetRequests, 94 SyntacticMatches, 0 SemanticMatches, 175 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9589 ImplicationChecksByTransitivity, 37.6s TimeCoverageRelationStatistics Valid=3395, Invalid=27757, Unknown=0, NotChecked=0, Total=31152 [2022-11-25 17:58:52,891 INFO L413 NwaCegarLoop]: 150 mSDtfsCounter, 1932 mSDsluCounter, 3149 mSDsCounter, 0 mSdLazyCounter, 7535 mSolverCounterSat, 444 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 26.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1944 SdHoareTripleChecker+Valid, 3299 SdHoareTripleChecker+Invalid, 7979 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 444 IncrementalHoareTripleChecker+Valid, 7535 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 27.3s IncrementalHoareTripleChecker+Time [2022-11-25 17:58:52,891 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1944 Valid, 3299 Invalid, 7979 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [444 Valid, 7535 Invalid, 0 Unknown, 0 Unchecked, 27.3s Time] [2022-11-25 17:58:52,893 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2279 states. [2022-11-25 17:58:53,706 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2279 to 797. [2022-11-25 17:58:53,706 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 797 states, 768 states have (on average 1.2864583333333333) internal successors, (988), 772 states have internal predecessors, (988), 21 states have call successors, (21), 7 states have call predecessors, (21), 7 states have return successors, (19), 17 states have call predecessors, (19), 19 states have call successors, (19) [2022-11-25 17:58:53,707 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 797 states to 797 states and 1028 transitions. [2022-11-25 17:58:53,708 INFO L78 Accepts]: Start accepts. Automaton has 797 states and 1028 transitions. Word has length 68 [2022-11-25 17:58:53,708 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 17:58:53,708 INFO L495 AbstractCegarLoop]: Abstraction has 797 states and 1028 transitions. [2022-11-25 17:58:53,708 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 68 states, 68 states have (on average 2.1176470588235294) internal successors, (144), 66 states have internal predecessors, (144), 4 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-11-25 17:58:53,708 INFO L276 IsEmpty]: Start isEmpty. Operand 797 states and 1028 transitions. [2022-11-25 17:58:53,710 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2022-11-25 17:58:53,710 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 17:58:53,710 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 17:58:53,719 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Forceful destruction successful, exit code 0 [2022-11-25 17:58:53,919 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable43 [2022-11-25 17:58:53,919 INFO L420 AbstractCegarLoop]: === Iteration 45 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 17:58:53,919 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 17:58:53,919 INFO L85 PathProgramCache]: Analyzing trace with hash 1785704929, now seen corresponding path program 12 times [2022-11-25 17:58:53,919 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-25 17:58:53,920 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1813222193] [2022-11-25 17:58:53,920 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 17:58:53,920 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 17:58:53,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:58:55,522 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-11-25 17:58:55,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:58:55,524 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-11-25 17:58:55,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:58:55,526 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 7 proven. 46 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-11-25 17:58:55,527 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-25 17:58:55,527 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1813222193] [2022-11-25 17:58:55,527 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1813222193] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 17:58:55,527 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [935035279] [2022-11-25 17:58:55,527 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-11-25 17:58:55,527 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 17:58:55,527 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 [2022-11-25 17:58:55,528 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 17:58:55,530 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2022-11-25 17:58:55,840 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2022-11-25 17:58:55,840 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 17:58:55,845 INFO L263 TraceCheckSpWp]: Trace formula consists of 275 conjuncts, 75 conjunts are in the unsatisfiable core [2022-11-25 17:58:55,848 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 17:58:56,780 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 17:58:56,781 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 17:58:56,783 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 17:58:56,785 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 17:58:56,788 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-25 17:58:56,788 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 84 treesize of output 31 [2022-11-25 17:58:56,824 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 7 proven. 61 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-25 17:58:56,824 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 17:58:57,405 INFO L321 Elim1Store]: treesize reduction 17, result has 83.5 percent of original size [2022-11-25 17:58:57,406 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 93 [2022-11-25 17:58:58,665 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 7 proven. 31 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-11-25 17:58:58,666 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [935035279] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 17:58:58,666 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 17:58:58,666 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 26, 16] total 44 [2022-11-25 17:58:58,667 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1425031518] [2022-11-25 17:58:58,667 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 17:58:58,667 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2022-11-25 17:58:58,667 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-25 17:58:58,668 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2022-11-25 17:58:58,669 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=162, Invalid=1730, Unknown=0, NotChecked=0, Total=1892 [2022-11-25 17:58:58,669 INFO L87 Difference]: Start difference. First operand 797 states and 1028 transitions. Second operand has 44 states, 44 states have (on average 2.477272727272727) internal successors, (109), 43 states have internal predecessors, (109), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-11-25 17:59:03,581 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 17:59:03,581 INFO L93 Difference]: Finished difference Result 1275 states and 1664 transitions. [2022-11-25 17:59:03,581 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2022-11-25 17:59:03,581 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 2.477272727272727) internal successors, (109), 43 states have internal predecessors, (109), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 68 [2022-11-25 17:59:03,582 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 17:59:03,585 INFO L225 Difference]: With dead ends: 1275 [2022-11-25 17:59:03,585 INFO L226 Difference]: Without dead ends: 1217 [2022-11-25 17:59:03,585 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 184 GetRequests, 110 SyntacticMatches, 8 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1119 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=455, Invalid=4101, Unknown=0, NotChecked=0, Total=4556 [2022-11-25 17:59:03,586 INFO L413 NwaCegarLoop]: 91 mSDtfsCounter, 468 mSDsluCounter, 1837 mSDsCounter, 0 mSdLazyCounter, 2456 mSolverCounterSat, 61 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 468 SdHoareTripleChecker+Valid, 1928 SdHoareTripleChecker+Invalid, 2517 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 61 IncrementalHoareTripleChecker+Valid, 2456 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2022-11-25 17:59:03,586 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [468 Valid, 1928 Invalid, 2517 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [61 Valid, 2456 Invalid, 0 Unknown, 0 Unchecked, 2.2s Time] [2022-11-25 17:59:03,587 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1217 states. [2022-11-25 17:59:04,491 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1217 to 793. [2022-11-25 17:59:04,492 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 793 states, 764 states have (on average 1.287958115183246) internal successors, (984), 768 states have internal predecessors, (984), 21 states have call successors, (21), 7 states have call predecessors, (21), 7 states have return successors, (19), 17 states have call predecessors, (19), 19 states have call successors, (19) [2022-11-25 17:59:04,493 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 793 states to 793 states and 1024 transitions. [2022-11-25 17:59:04,493 INFO L78 Accepts]: Start accepts. Automaton has 793 states and 1024 transitions. Word has length 68 [2022-11-25 17:59:04,494 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 17:59:04,494 INFO L495 AbstractCegarLoop]: Abstraction has 793 states and 1024 transitions. [2022-11-25 17:59:04,494 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 2.477272727272727) internal successors, (109), 43 states have internal predecessors, (109), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-11-25 17:59:04,494 INFO L276 IsEmpty]: Start isEmpty. Operand 793 states and 1024 transitions. [2022-11-25 17:59:04,496 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2022-11-25 17:59:04,496 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 17:59:04,496 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 17:59:04,502 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Forceful destruction successful, exit code 0 [2022-11-25 17:59:04,697 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44,38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 17:59:04,698 INFO L420 AbstractCegarLoop]: === Iteration 46 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 17:59:04,698 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 17:59:04,698 INFO L85 PathProgramCache]: Analyzing trace with hash -1009014033, now seen corresponding path program 2 times [2022-11-25 17:59:04,698 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-25 17:59:04,698 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1157757589] [2022-11-25 17:59:04,699 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 17:59:04,699 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 17:59:04,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:59:04,810 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-11-25 17:59:04,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:59:04,812 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-11-25 17:59:04,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:59:04,814 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2022-11-25 17:59:04,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:59:04,817 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 48 [2022-11-25 17:59:04,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:59:04,821 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 58 [2022-11-25 17:59:04,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:59:04,823 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2022-11-25 17:59:04,823 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-25 17:59:04,823 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1157757589] [2022-11-25 17:59:04,824 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1157757589] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 17:59:04,824 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-25 17:59:04,824 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-11-25 17:59:04,824 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1637478010] [2022-11-25 17:59:04,824 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 17:59:04,825 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-25 17:59:04,825 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-25 17:59:04,825 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-25 17:59:04,825 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2022-11-25 17:59:04,826 INFO L87 Difference]: Start difference. First operand 793 states and 1024 transitions. Second operand has 6 states, 6 states have (on average 7.833333333333333) internal successors, (47), 6 states have internal predecessors, (47), 3 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2022-11-25 17:59:05,502 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 17:59:05,502 INFO L93 Difference]: Finished difference Result 862 states and 1110 transitions. [2022-11-25 17:59:05,504 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-25 17:59:05,504 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 7.833333333333333) internal successors, (47), 6 states have internal predecessors, (47), 3 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) Word has length 73 [2022-11-25 17:59:05,504 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 17:59:05,508 INFO L225 Difference]: With dead ends: 862 [2022-11-25 17:59:05,508 INFO L226 Difference]: Without dead ends: 813 [2022-11-25 17:59:05,508 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2022-11-25 17:59:05,509 INFO L413 NwaCegarLoop]: 65 mSDtfsCounter, 12 mSDsluCounter, 109 mSDsCounter, 0 mSdLazyCounter, 32 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 174 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 32 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-25 17:59:05,509 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 174 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 32 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-25 17:59:05,510 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 813 states. [2022-11-25 17:59:06,174 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 813 to 805. [2022-11-25 17:59:06,175 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 805 states, 776 states have (on average 1.2835051546391754) internal successors, (996), 780 states have internal predecessors, (996), 21 states have call successors, (21), 7 states have call predecessors, (21), 7 states have return successors, (19), 17 states have call predecessors, (19), 19 states have call successors, (19) [2022-11-25 17:59:06,176 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 805 states to 805 states and 1036 transitions. [2022-11-25 17:59:06,176 INFO L78 Accepts]: Start accepts. Automaton has 805 states and 1036 transitions. Word has length 73 [2022-11-25 17:59:06,176 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 17:59:06,176 INFO L495 AbstractCegarLoop]: Abstraction has 805 states and 1036 transitions. [2022-11-25 17:59:06,176 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 7.833333333333333) internal successors, (47), 6 states have internal predecessors, (47), 3 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2022-11-25 17:59:06,176 INFO L276 IsEmpty]: Start isEmpty. Operand 805 states and 1036 transitions. [2022-11-25 17:59:06,177 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2022-11-25 17:59:06,178 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 17:59:06,178 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 17:59:06,178 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2022-11-25 17:59:06,178 INFO L420 AbstractCegarLoop]: === Iteration 47 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 17:59:06,178 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 17:59:06,179 INFO L85 PathProgramCache]: Analyzing trace with hash -1900032544, now seen corresponding path program 1 times [2022-11-25 17:59:06,179 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-25 17:59:06,179 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1040688108] [2022-11-25 17:59:06,179 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 17:59:06,179 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 17:59:06,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:59:06,489 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-11-25 17:59:06,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:59:06,491 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-11-25 17:59:06,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:59:06,493 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2022-11-25 17:59:06,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:59:06,497 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 48 [2022-11-25 17:59:06,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:59:06,500 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2022-11-25 17:59:06,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:59:06,505 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 8 proven. 12 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2022-11-25 17:59:06,505 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-25 17:59:06,505 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1040688108] [2022-11-25 17:59:06,506 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1040688108] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 17:59:06,506 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2017830742] [2022-11-25 17:59:06,506 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 17:59:06,506 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 17:59:06,507 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 [2022-11-25 17:59:06,508 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 17:59:06,531 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2022-11-25 17:59:06,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:59:06,690 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 14 conjunts are in the unsatisfiable core [2022-11-25 17:59:06,692 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 17:59:06,906 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 10 proven. 10 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2022-11-25 17:59:06,907 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 17:59:07,146 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 10 proven. 10 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2022-11-25 17:59:07,147 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2017830742] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 17:59:07,147 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 17:59:07,147 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 9] total 19 [2022-11-25 17:59:07,147 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [310161157] [2022-11-25 17:59:07,147 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 17:59:07,148 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-11-25 17:59:07,148 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-25 17:59:07,148 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-11-25 17:59:07,149 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=285, Unknown=0, NotChecked=0, Total=342 [2022-11-25 17:59:07,149 INFO L87 Difference]: Start difference. First operand 805 states and 1036 transitions. Second operand has 19 states, 19 states have (on average 4.2105263157894735) internal successors, (80), 19 states have internal predecessors, (80), 8 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 7 states have call predecessors, (8), 7 states have call successors, (8) [2022-11-25 17:59:08,078 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 17:59:08,079 INFO L93 Difference]: Finished difference Result 818 states and 1047 transitions. [2022-11-25 17:59:08,079 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-11-25 17:59:08,079 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 4.2105263157894735) internal successors, (80), 19 states have internal predecessors, (80), 8 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 7 states have call predecessors, (8), 7 states have call successors, (8) Word has length 74 [2022-11-25 17:59:08,079 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 17:59:08,082 INFO L225 Difference]: With dead ends: 818 [2022-11-25 17:59:08,083 INFO L226 Difference]: Without dead ends: 758 [2022-11-25 17:59:08,083 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 173 GetRequests, 149 SyntacticMatches, 3 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 86 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=95, Invalid=411, Unknown=0, NotChecked=0, Total=506 [2022-11-25 17:59:08,084 INFO L413 NwaCegarLoop]: 58 mSDtfsCounter, 62 mSDsluCounter, 614 mSDsCounter, 0 mSdLazyCounter, 303 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 62 SdHoareTripleChecker+Valid, 672 SdHoareTripleChecker+Invalid, 312 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 303 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-25 17:59:08,084 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [62 Valid, 672 Invalid, 312 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 303 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-25 17:59:08,085 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 758 states. [2022-11-25 17:59:08,619 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 758 to 758. [2022-11-25 17:59:08,620 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 758 states, 734 states have (on average 1.2956403269754768) internal successors, (951), 737 states have internal predecessors, (951), 16 states have call successors, (16), 7 states have call predecessors, (16), 7 states have return successors, (14), 13 states have call predecessors, (14), 14 states have call successors, (14) [2022-11-25 17:59:08,621 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 758 states to 758 states and 981 transitions. [2022-11-25 17:59:08,621 INFO L78 Accepts]: Start accepts. Automaton has 758 states and 981 transitions. Word has length 74 [2022-11-25 17:59:08,621 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 17:59:08,621 INFO L495 AbstractCegarLoop]: Abstraction has 758 states and 981 transitions. [2022-11-25 17:59:08,622 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 4.2105263157894735) internal successors, (80), 19 states have internal predecessors, (80), 8 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 7 states have call predecessors, (8), 7 states have call successors, (8) [2022-11-25 17:59:08,622 INFO L276 IsEmpty]: Start isEmpty. Operand 758 states and 981 transitions. [2022-11-25 17:59:08,623 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2022-11-25 17:59:08,624 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 17:59:08,624 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 17:59:08,632 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Forceful destruction successful, exit code 0 [2022-11-25 17:59:08,830 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable46 [2022-11-25 17:59:08,830 INFO L420 AbstractCegarLoop]: === Iteration 48 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 17:59:08,830 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 17:59:08,830 INFO L85 PathProgramCache]: Analyzing trace with hash -1078383189, now seen corresponding path program 2 times [2022-11-25 17:59:08,831 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-25 17:59:08,831 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [58527352] [2022-11-25 17:59:08,831 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 17:59:08,831 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 17:59:08,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:59:09,108 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-11-25 17:59:09,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:59:09,110 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-11-25 17:59:09,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:59:09,113 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 40 [2022-11-25 17:59:09,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:59:09,115 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 50 [2022-11-25 17:59:09,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:59:09,117 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2022-11-25 17:59:09,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:59:09,122 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2022-11-25 17:59:09,122 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-25 17:59:09,122 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [58527352] [2022-11-25 17:59:09,123 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [58527352] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 17:59:09,123 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1241882685] [2022-11-25 17:59:09,123 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-25 17:59:09,123 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 17:59:09,124 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 [2022-11-25 17:59:09,128 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 17:59:09,144 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2022-11-25 17:59:09,302 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-25 17:59:09,302 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 17:59:09,304 INFO L263 TraceCheckSpWp]: Trace formula consists of 250 conjuncts, 29 conjunts are in the unsatisfiable core [2022-11-25 17:59:09,306 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 17:59:09,692 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 4 proven. 20 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2022-11-25 17:59:09,692 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 17:59:10,231 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2022-11-25 17:59:10,231 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1241882685] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 17:59:10,231 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 17:59:10,231 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 12, 10] total 25 [2022-11-25 17:59:10,231 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1061053928] [2022-11-25 17:59:10,231 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 17:59:10,232 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-11-25 17:59:10,232 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-25 17:59:10,232 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-11-25 17:59:10,233 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=504, Unknown=0, NotChecked=0, Total=600 [2022-11-25 17:59:10,233 INFO L87 Difference]: Start difference. First operand 758 states and 981 transitions. Second operand has 25 states, 25 states have (on average 3.72) internal successors, (93), 25 states have internal predecessors, (93), 9 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 8 states have call predecessors, (10), 8 states have call successors, (10) [2022-11-25 17:59:12,840 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 17:59:12,840 INFO L93 Difference]: Finished difference Result 1141 states and 1474 transitions. [2022-11-25 17:59:12,840 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-11-25 17:59:12,841 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 3.72) internal successors, (93), 25 states have internal predecessors, (93), 9 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 8 states have call predecessors, (10), 8 states have call successors, (10) Word has length 74 [2022-11-25 17:59:12,841 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 17:59:12,845 INFO L225 Difference]: With dead ends: 1141 [2022-11-25 17:59:12,845 INFO L226 Difference]: Without dead ends: 1035 [2022-11-25 17:59:12,846 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 186 GetRequests, 146 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 331 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=320, Invalid=1402, Unknown=0, NotChecked=0, Total=1722 [2022-11-25 17:59:12,846 INFO L413 NwaCegarLoop]: 80 mSDtfsCounter, 343 mSDsluCounter, 743 mSDsCounter, 0 mSdLazyCounter, 922 mSolverCounterSat, 84 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 347 SdHoareTripleChecker+Valid, 823 SdHoareTripleChecker+Invalid, 1006 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 84 IncrementalHoareTripleChecker+Valid, 922 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-11-25 17:59:12,847 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [347 Valid, 823 Invalid, 1006 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [84 Valid, 922 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-11-25 17:59:12,848 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1035 states. [2022-11-25 17:59:13,422 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1035 to 760. [2022-11-25 17:59:13,423 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 760 states, 736 states have (on average 1.28125) internal successors, (943), 739 states have internal predecessors, (943), 16 states have call successors, (16), 7 states have call predecessors, (16), 7 states have return successors, (14), 13 states have call predecessors, (14), 14 states have call successors, (14) [2022-11-25 17:59:13,424 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 760 states to 760 states and 973 transitions. [2022-11-25 17:59:13,424 INFO L78 Accepts]: Start accepts. Automaton has 760 states and 973 transitions. Word has length 74 [2022-11-25 17:59:13,424 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 17:59:13,424 INFO L495 AbstractCegarLoop]: Abstraction has 760 states and 973 transitions. [2022-11-25 17:59:13,425 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 3.72) internal successors, (93), 25 states have internal predecessors, (93), 9 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 8 states have call predecessors, (10), 8 states have call successors, (10) [2022-11-25 17:59:13,425 INFO L276 IsEmpty]: Start isEmpty. Operand 760 states and 973 transitions. [2022-11-25 17:59:13,425 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2022-11-25 17:59:13,426 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 17:59:13,426 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 4, 4, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 17:59:13,431 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Ended with exit code 0 [2022-11-25 17:59:13,626 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable47 [2022-11-25 17:59:13,626 INFO L420 AbstractCegarLoop]: === Iteration 49 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 17:59:13,626 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 17:59:13,627 INFO L85 PathProgramCache]: Analyzing trace with hash 894264333, now seen corresponding path program 13 times [2022-11-25 17:59:13,627 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-25 17:59:13,627 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [878860066] [2022-11-25 17:59:13,627 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 17:59:13,627 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 17:59:13,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:59:14,187 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-11-25 17:59:14,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:59:14,189 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-11-25 17:59:14,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:59:14,191 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 5 proven. 38 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2022-11-25 17:59:14,191 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-25 17:59:14,191 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [878860066] [2022-11-25 17:59:14,192 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [878860066] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 17:59:14,192 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2119410546] [2022-11-25 17:59:14,192 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-25 17:59:14,192 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 17:59:14,194 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 [2022-11-25 17:59:14,196 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 17:59:14,223 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2022-11-25 17:59:14,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:59:14,402 INFO L263 TraceCheckSpWp]: Trace formula consists of 285 conjuncts, 38 conjunts are in the unsatisfiable core [2022-11-25 17:59:14,404 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 17:59:14,842 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 5 proven. 54 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2022-11-25 17:59:14,842 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 17:59:15,263 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 5 proven. 38 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2022-11-25 17:59:15,264 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2119410546] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 17:59:15,264 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 17:59:15,264 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 18, 14] total 33 [2022-11-25 17:59:15,264 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1399598179] [2022-11-25 17:59:15,264 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 17:59:15,265 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2022-11-25 17:59:15,265 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-25 17:59:15,265 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2022-11-25 17:59:15,265 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=947, Unknown=0, NotChecked=0, Total=1056 [2022-11-25 17:59:15,266 INFO L87 Difference]: Start difference. First operand 760 states and 973 transitions. Second operand has 33 states, 33 states have (on average 2.727272727272727) internal successors, (90), 33 states have internal predecessors, (90), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-25 17:59:20,506 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 17:59:20,506 INFO L93 Difference]: Finished difference Result 2724 states and 3534 transitions. [2022-11-25 17:59:20,507 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2022-11-25 17:59:20,507 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 2.727272727272727) internal successors, (90), 33 states have internal predecessors, (90), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 71 [2022-11-25 17:59:20,507 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 17:59:20,513 INFO L225 Difference]: With dead ends: 2724 [2022-11-25 17:59:20,513 INFO L226 Difference]: Without dead ends: 2256 [2022-11-25 17:59:20,514 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 192 GetRequests, 124 SyntacticMatches, 5 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 780 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=524, Invalid=3636, Unknown=0, NotChecked=0, Total=4160 [2022-11-25 17:59:20,515 INFO L413 NwaCegarLoop]: 172 mSDtfsCounter, 1643 mSDsluCounter, 2619 mSDsCounter, 0 mSdLazyCounter, 1930 mSolverCounterSat, 156 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1647 SdHoareTripleChecker+Valid, 2791 SdHoareTripleChecker+Invalid, 2086 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 156 IncrementalHoareTripleChecker+Valid, 1930 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2022-11-25 17:59:20,515 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1647 Valid, 2791 Invalid, 2086 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [156 Valid, 1930 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2022-11-25 17:59:20,517 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2256 states. [2022-11-25 17:59:21,165 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2256 to 834. [2022-11-25 17:59:21,166 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 834 states, 810 states have (on average 1.2938271604938272) internal successors, (1048), 813 states have internal predecessors, (1048), 16 states have call successors, (16), 7 states have call predecessors, (16), 7 states have return successors, (14), 13 states have call predecessors, (14), 14 states have call successors, (14) [2022-11-25 17:59:21,167 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 834 states to 834 states and 1078 transitions. [2022-11-25 17:59:21,167 INFO L78 Accepts]: Start accepts. Automaton has 834 states and 1078 transitions. Word has length 71 [2022-11-25 17:59:21,168 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 17:59:21,168 INFO L495 AbstractCegarLoop]: Abstraction has 834 states and 1078 transitions. [2022-11-25 17:59:21,168 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 2.727272727272727) internal successors, (90), 33 states have internal predecessors, (90), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-25 17:59:21,168 INFO L276 IsEmpty]: Start isEmpty. Operand 834 states and 1078 transitions. [2022-11-25 17:59:21,170 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2022-11-25 17:59:21,171 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 17:59:21,171 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 7, 5, 5, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 17:59:21,181 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Forceful destruction successful, exit code 0 [2022-11-25 17:59:21,371 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable48 [2022-11-25 17:59:21,372 INFO L420 AbstractCegarLoop]: === Iteration 50 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 17:59:21,372 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 17:59:21,372 INFO L85 PathProgramCache]: Analyzing trace with hash 1854811415, now seen corresponding path program 1 times [2022-11-25 17:59:21,372 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-25 17:59:21,372 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1322321401] [2022-11-25 17:59:21,372 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 17:59:21,372 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 17:59:21,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:59:21,616 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-11-25 17:59:21,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:59:21,618 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-11-25 17:59:21,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:59:21,620 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 0 proven. 70 refuted. 0 times theorem prover too weak. 41 trivial. 0 not checked. [2022-11-25 17:59:21,620 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-25 17:59:21,620 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1322321401] [2022-11-25 17:59:21,620 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1322321401] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 17:59:21,620 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [140217366] [2022-11-25 17:59:21,621 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 17:59:21,621 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 17:59:21,621 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 [2022-11-25 17:59:21,624 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 17:59:21,645 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2022-11-25 17:59:21,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:59:21,801 INFO L263 TraceCheckSpWp]: Trace formula consists of 293 conjuncts, 26 conjunts are in the unsatisfiable core [2022-11-25 17:59:21,803 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 17:59:22,161 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 40 proven. 42 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2022-11-25 17:59:22,161 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 17:59:22,525 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 40 proven. 21 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2022-11-25 17:59:22,525 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [140217366] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 17:59:22,525 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 17:59:22,525 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14, 11] total 33 [2022-11-25 17:59:22,525 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2040622769] [2022-11-25 17:59:22,526 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 17:59:22,526 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2022-11-25 17:59:22,526 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-25 17:59:22,527 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2022-11-25 17:59:22,528 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=969, Unknown=0, NotChecked=0, Total=1056 [2022-11-25 17:59:22,528 INFO L87 Difference]: Start difference. First operand 834 states and 1078 transitions. Second operand has 33 states, 32 states have (on average 3.4375) internal successors, (110), 32 states have internal predecessors, (110), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-25 17:59:24,923 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 17:59:24,924 INFO L93 Difference]: Finished difference Result 1285 states and 1643 transitions. [2022-11-25 17:59:24,924 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-11-25 17:59:24,924 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 32 states have (on average 3.4375) internal successors, (110), 32 states have internal predecessors, (110), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 71 [2022-11-25 17:59:24,924 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 17:59:24,927 INFO L225 Difference]: With dead ends: 1285 [2022-11-25 17:59:24,927 INFO L226 Difference]: Without dead ends: 977 [2022-11-25 17:59:24,927 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 127 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 137 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=224, Invalid=1938, Unknown=0, NotChecked=0, Total=2162 [2022-11-25 17:59:24,928 INFO L413 NwaCegarLoop]: 80 mSDtfsCounter, 114 mSDsluCounter, 1724 mSDsCounter, 0 mSdLazyCounter, 1586 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 114 SdHoareTripleChecker+Valid, 1804 SdHoareTripleChecker+Invalid, 1597 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 1586 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-11-25 17:59:24,928 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [114 Valid, 1804 Invalid, 1597 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 1586 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-11-25 17:59:24,929 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 977 states. [2022-11-25 17:59:25,613 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 977 to 812. [2022-11-25 17:59:25,614 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 812 states, 788 states have (on average 1.2931472081218274) internal successors, (1019), 791 states have internal predecessors, (1019), 16 states have call successors, (16), 7 states have call predecessors, (16), 7 states have return successors, (14), 13 states have call predecessors, (14), 14 states have call successors, (14) [2022-11-25 17:59:25,616 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 812 states to 812 states and 1049 transitions. [2022-11-25 17:59:25,616 INFO L78 Accepts]: Start accepts. Automaton has 812 states and 1049 transitions. Word has length 71 [2022-11-25 17:59:25,616 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 17:59:25,616 INFO L495 AbstractCegarLoop]: Abstraction has 812 states and 1049 transitions. [2022-11-25 17:59:25,616 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 32 states have (on average 3.4375) internal successors, (110), 32 states have internal predecessors, (110), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-25 17:59:25,616 INFO L276 IsEmpty]: Start isEmpty. Operand 812 states and 1049 transitions. [2022-11-25 17:59:25,617 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2022-11-25 17:59:25,617 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 17:59:25,617 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 4, 4, 4, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 17:59:25,623 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Forceful destruction successful, exit code 0 [2022-11-25 17:59:25,818 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable49,42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 17:59:25,818 INFO L420 AbstractCegarLoop]: === Iteration 51 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 17:59:25,818 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 17:59:25,819 INFO L85 PathProgramCache]: Analyzing trace with hash 1292302041, now seen corresponding path program 4 times [2022-11-25 17:59:25,819 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-25 17:59:25,819 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [284337528] [2022-11-25 17:59:25,819 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 17:59:25,819 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 17:59:25,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:59:27,248 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-11-25 17:59:27,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:59:27,250 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-11-25 17:59:27,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:59:27,252 INFO L134 CoverageAnalysis]: Checked inductivity of 89 backedges. 7 proven. 37 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2022-11-25 17:59:27,252 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-25 17:59:27,252 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [284337528] [2022-11-25 17:59:27,252 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [284337528] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 17:59:27,252 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1883064987] [2022-11-25 17:59:27,252 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 17:59:27,252 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 17:59:27,253 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 [2022-11-25 17:59:27,253 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 17:59:27,256 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Waiting until timeout for monitored process [2022-11-25 17:59:27,644 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 17:59:27,644 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 17:59:27,648 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 79 conjunts are in the unsatisfiable core [2022-11-25 17:59:27,650 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 17:59:28,171 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-25 17:59:29,807 INFO L321 Elim1Store]: treesize reduction 3, result has 75.0 percent of original size [2022-11-25 17:59:29,807 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 31 treesize of output 20 [2022-11-25 17:59:29,863 INFO L134 CoverageAnalysis]: Checked inductivity of 89 backedges. 7 proven. 74 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2022-11-25 17:59:29,863 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 17:59:31,374 INFO L134 CoverageAnalysis]: Checked inductivity of 89 backedges. 14 proven. 30 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2022-11-25 17:59:31,375 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1883064987] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 17:59:31,375 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 17:59:31,375 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 28, 16] total 56 [2022-11-25 17:59:31,375 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [133046628] [2022-11-25 17:59:31,376 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 17:59:31,376 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2022-11-25 17:59:31,376 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-25 17:59:31,377 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2022-11-25 17:59:31,377 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=356, Invalid=2724, Unknown=0, NotChecked=0, Total=3080 [2022-11-25 17:59:31,378 INFO L87 Difference]: Start difference. First operand 812 states and 1049 transitions. Second operand has 56 states, 55 states have (on average 2.6545454545454548) internal successors, (146), 54 states have internal predecessors, (146), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2022-11-25 17:59:43,394 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 17:59:43,394 INFO L93 Difference]: Finished difference Result 2113 states and 2788 transitions. [2022-11-25 17:59:43,394 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2022-11-25 17:59:43,395 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 55 states have (on average 2.6545454545454548) internal successors, (146), 54 states have internal predecessors, (146), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) Word has length 72 [2022-11-25 17:59:43,395 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 17:59:43,399 INFO L225 Difference]: With dead ends: 2113 [2022-11-25 17:59:43,399 INFO L226 Difference]: Without dead ends: 1988 [2022-11-25 17:59:43,400 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 220 GetRequests, 110 SyntacticMatches, 0 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2989 ImplicationChecksByTransitivity, 7.8s TimeCoverageRelationStatistics Valid=1480, Invalid=10952, Unknown=0, NotChecked=0, Total=12432 [2022-11-25 17:59:43,401 INFO L413 NwaCegarLoop]: 154 mSDtfsCounter, 1342 mSDsluCounter, 2993 mSDsCounter, 0 mSdLazyCounter, 4843 mSolverCounterSat, 293 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1342 SdHoareTripleChecker+Valid, 3147 SdHoareTripleChecker+Invalid, 5136 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 293 IncrementalHoareTripleChecker+Valid, 4843 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.2s IncrementalHoareTripleChecker+Time [2022-11-25 17:59:43,401 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1342 Valid, 3147 Invalid, 5136 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [293 Valid, 4843 Invalid, 0 Unknown, 0 Unchecked, 4.2s Time] [2022-11-25 17:59:43,403 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1988 states. [2022-11-25 17:59:44,131 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1988 to 881. [2022-11-25 17:59:44,132 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 881 states, 857 states have (on average 1.2987164527421238) internal successors, (1113), 860 states have internal predecessors, (1113), 16 states have call successors, (16), 7 states have call predecessors, (16), 7 states have return successors, (14), 13 states have call predecessors, (14), 14 states have call successors, (14) [2022-11-25 17:59:44,134 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 881 states to 881 states and 1143 transitions. [2022-11-25 17:59:44,134 INFO L78 Accepts]: Start accepts. Automaton has 881 states and 1143 transitions. Word has length 72 [2022-11-25 17:59:44,135 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 17:59:44,135 INFO L495 AbstractCegarLoop]: Abstraction has 881 states and 1143 transitions. [2022-11-25 17:59:44,135 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 56 states, 55 states have (on average 2.6545454545454548) internal successors, (146), 54 states have internal predecessors, (146), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2022-11-25 17:59:44,135 INFO L276 IsEmpty]: Start isEmpty. Operand 881 states and 1143 transitions. [2022-11-25 17:59:44,137 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2022-11-25 17:59:44,137 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 17:59:44,137 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 4, 4, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 17:59:44,144 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Forceful destruction successful, exit code 0 [2022-11-25 17:59:44,344 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50,43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 17:59:44,344 INFO L420 AbstractCegarLoop]: === Iteration 52 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 17:59:44,345 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 17:59:44,345 INFO L85 PathProgramCache]: Analyzing trace with hash 121073647, now seen corresponding path program 14 times [2022-11-25 17:59:44,345 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-25 17:59:44,345 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1308481429] [2022-11-25 17:59:44,346 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 17:59:44,346 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 17:59:44,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:59:45,078 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-11-25 17:59:45,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:59:45,080 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-11-25 17:59:45,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:59:45,082 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 5 proven. 38 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2022-11-25 17:59:45,083 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-25 17:59:45,083 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1308481429] [2022-11-25 17:59:45,083 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1308481429] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 17:59:45,083 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [571486586] [2022-11-25 17:59:45,083 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-25 17:59:45,083 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 17:59:45,084 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 [2022-11-25 17:59:45,085 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 17:59:45,111 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Waiting until timeout for monitored process [2022-11-25 17:59:45,333 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-25 17:59:45,333 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 17:59:45,336 INFO L263 TraceCheckSpWp]: Trace formula consists of 294 conjuncts, 36 conjunts are in the unsatisfiable core [2022-11-25 17:59:45,338 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 17:59:45,800 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 5 proven. 38 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2022-11-25 17:59:45,800 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 17:59:46,283 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 5 proven. 38 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2022-11-25 17:59:46,283 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [571486586] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 17:59:46,283 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 17:59:46,284 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14, 14] total 36 [2022-11-25 17:59:46,284 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [537815089] [2022-11-25 17:59:46,284 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 17:59:46,284 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2022-11-25 17:59:46,284 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-25 17:59:46,285 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2022-11-25 17:59:46,285 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=151, Invalid=1109, Unknown=0, NotChecked=0, Total=1260 [2022-11-25 17:59:46,286 INFO L87 Difference]: Start difference. First operand 881 states and 1143 transitions. Second operand has 36 states, 36 states have (on average 2.861111111111111) internal successors, (103), 36 states have internal predecessors, (103), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-25 17:59:49,363 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 17:59:49,363 INFO L93 Difference]: Finished difference Result 1442 states and 1858 transitions. [2022-11-25 17:59:49,364 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-11-25 17:59:49,364 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 2.861111111111111) internal successors, (103), 36 states have internal predecessors, (103), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 73 [2022-11-25 17:59:49,364 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 17:59:49,367 INFO L225 Difference]: With dead ends: 1442 [2022-11-25 17:59:49,367 INFO L226 Difference]: Without dead ends: 1175 [2022-11-25 17:59:49,367 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 177 GetRequests, 129 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 365 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=351, Invalid=2099, Unknown=0, NotChecked=0, Total=2450 [2022-11-25 17:59:49,368 INFO L413 NwaCegarLoop]: 136 mSDtfsCounter, 795 mSDsluCounter, 1774 mSDsCounter, 0 mSdLazyCounter, 1022 mSolverCounterSat, 88 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 795 SdHoareTripleChecker+Valid, 1910 SdHoareTripleChecker+Invalid, 1110 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 88 IncrementalHoareTripleChecker+Valid, 1022 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-11-25 17:59:49,368 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [795 Valid, 1910 Invalid, 1110 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [88 Valid, 1022 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-11-25 17:59:49,369 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1175 states. [2022-11-25 17:59:49,971 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1175 to 737. [2022-11-25 17:59:49,972 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 737 states, 713 states have (on average 1.2861150070126228) internal successors, (917), 716 states have internal predecessors, (917), 16 states have call successors, (16), 7 states have call predecessors, (16), 7 states have return successors, (14), 13 states have call predecessors, (14), 14 states have call successors, (14) [2022-11-25 17:59:49,973 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 737 states to 737 states and 947 transitions. [2022-11-25 17:59:49,973 INFO L78 Accepts]: Start accepts. Automaton has 737 states and 947 transitions. Word has length 73 [2022-11-25 17:59:49,973 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 17:59:49,973 INFO L495 AbstractCegarLoop]: Abstraction has 737 states and 947 transitions. [2022-11-25 17:59:49,973 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 2.861111111111111) internal successors, (103), 36 states have internal predecessors, (103), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-25 17:59:49,973 INFO L276 IsEmpty]: Start isEmpty. Operand 737 states and 947 transitions. [2022-11-25 17:59:49,974 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2022-11-25 17:59:49,974 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 17:59:49,975 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 17:59:49,983 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Forceful destruction successful, exit code 0 [2022-11-25 17:59:50,176 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51,44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 17:59:50,176 INFO L420 AbstractCegarLoop]: === Iteration 53 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 17:59:50,176 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 17:59:50,176 INFO L85 PathProgramCache]: Analyzing trace with hash -306423327, now seen corresponding path program 1 times [2022-11-25 17:59:50,176 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-25 17:59:50,177 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1939710757] [2022-11-25 17:59:50,177 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 17:59:50,177 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 17:59:50,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:59:51,516 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-11-25 17:59:51,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:59:51,518 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-11-25 17:59:51,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:59:51,519 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 43 [2022-11-25 17:59:51,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:59:51,522 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 53 [2022-11-25 17:59:51,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:59:51,525 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 63 [2022-11-25 17:59:51,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:59:51,551 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 17 proven. 22 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2022-11-25 17:59:51,551 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-25 17:59:51,551 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1939710757] [2022-11-25 17:59:51,551 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1939710757] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 17:59:51,551 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [653467463] [2022-11-25 17:59:51,551 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 17:59:51,552 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 17:59:51,552 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 [2022-11-25 17:59:51,553 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 17:59:51,556 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Waiting until timeout for monitored process [2022-11-25 17:59:51,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:59:51,711 INFO L263 TraceCheckSpWp]: Trace formula consists of 262 conjuncts, 59 conjunts are in the unsatisfiable core [2022-11-25 17:59:51,714 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 17:59:52,197 INFO L321 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2022-11-25 17:59:52,197 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 26 treesize of output 10 [2022-11-25 17:59:52,217 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 17 proven. 29 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-11-25 17:59:52,217 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 17:59:52,450 INFO L321 Elim1Store]: treesize reduction 19, result has 81.2 percent of original size [2022-11-25 17:59:52,451 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 89 [2022-11-25 17:59:52,959 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 18 proven. 11 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2022-11-25 17:59:52,959 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [653467463] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 17:59:52,959 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 17:59:52,959 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 12] total 32 [2022-11-25 17:59:52,960 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [996945317] [2022-11-25 17:59:52,960 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 17:59:52,960 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-11-25 17:59:52,960 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-25 17:59:52,960 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-11-25 17:59:52,961 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=861, Unknown=0, NotChecked=0, Total=992 [2022-11-25 17:59:52,961 INFO L87 Difference]: Start difference. First operand 737 states and 947 transitions. Second operand has 32 states, 30 states have (on average 3.6) internal successors, (108), 32 states have internal predecessors, (108), 8 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 6 states have call predecessors, (8), 7 states have call successors, (8) [2022-11-25 17:59:55,273 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 17:59:55,273 INFO L93 Difference]: Finished difference Result 954 states and 1228 transitions. [2022-11-25 17:59:55,274 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-11-25 17:59:55,274 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 30 states have (on average 3.6) internal successors, (108), 32 states have internal predecessors, (108), 8 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 6 states have call predecessors, (8), 7 states have call successors, (8) Word has length 78 [2022-11-25 17:59:55,274 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 17:59:55,276 INFO L225 Difference]: With dead ends: 954 [2022-11-25 17:59:55,277 INFO L226 Difference]: Without dead ends: 925 [2022-11-25 17:59:55,277 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 190 GetRequests, 146 SyntacticMatches, 6 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 428 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=232, Invalid=1328, Unknown=0, NotChecked=0, Total=1560 [2022-11-25 17:59:55,278 INFO L413 NwaCegarLoop]: 86 mSDtfsCounter, 210 mSDsluCounter, 1190 mSDsCounter, 0 mSdLazyCounter, 1142 mSolverCounterSat, 53 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 218 SdHoareTripleChecker+Valid, 1276 SdHoareTripleChecker+Invalid, 1195 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 53 IncrementalHoareTripleChecker+Valid, 1142 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-11-25 17:59:55,278 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [218 Valid, 1276 Invalid, 1195 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [53 Valid, 1142 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-11-25 17:59:55,279 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 925 states. [2022-11-25 17:59:56,004 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 925 to 751. [2022-11-25 17:59:56,005 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 751 states, 725 states have (on average 1.2813793103448277) internal successors, (929), 728 states have internal predecessors, (929), 18 states have call successors, (18), 7 states have call predecessors, (18), 7 states have return successors, (16), 15 states have call predecessors, (16), 16 states have call successors, (16) [2022-11-25 17:59:56,006 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 751 states to 751 states and 963 transitions. [2022-11-25 17:59:56,006 INFO L78 Accepts]: Start accepts. Automaton has 751 states and 963 transitions. Word has length 78 [2022-11-25 17:59:56,006 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 17:59:56,006 INFO L495 AbstractCegarLoop]: Abstraction has 751 states and 963 transitions. [2022-11-25 17:59:56,007 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 30 states have (on average 3.6) internal successors, (108), 32 states have internal predecessors, (108), 8 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 6 states have call predecessors, (8), 7 states have call successors, (8) [2022-11-25 17:59:56,007 INFO L276 IsEmpty]: Start isEmpty. Operand 751 states and 963 transitions. [2022-11-25 17:59:56,008 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2022-11-25 17:59:56,008 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 17:59:56,009 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 5, 4, 4, 4, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 17:59:56,020 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Forceful destruction successful, exit code 0 [2022-11-25 17:59:56,215 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52,45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 17:59:56,216 INFO L420 AbstractCegarLoop]: === Iteration 54 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 17:59:56,216 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 17:59:56,216 INFO L85 PathProgramCache]: Analyzing trace with hash -2061405423, now seen corresponding path program 15 times [2022-11-25 17:59:56,216 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-25 17:59:56,216 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1193835084] [2022-11-25 17:59:56,216 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 17:59:56,217 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 17:59:56,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:59:57,165 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-11-25 17:59:57,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:59:57,167 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-11-25 17:59:57,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:59:57,169 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2022-11-25 17:59:57,169 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-25 17:59:57,169 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1193835084] [2022-11-25 17:59:57,170 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1193835084] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 17:59:57,170 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1273323425] [2022-11-25 17:59:57,170 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 17:59:57,170 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 17:59:57,170 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 [2022-11-25 17:59:57,172 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 17:59:57,175 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Waiting until timeout for monitored process [2022-11-25 18:00:00,256 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-11-25 18:00:00,256 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 18:00:00,263 INFO L263 TraceCheckSpWp]: Trace formula consists of 285 conjuncts, 33 conjunts are in the unsatisfiable core [2022-11-25 18:00:00,265 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 18:00:00,878 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 0 proven. 58 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2022-11-25 18:00:00,878 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 18:00:01,674 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 5 proven. 44 refuted. 0 times theorem prover too weak. 54 trivial. 0 not checked. [2022-11-25 18:00:01,675 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1273323425] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 18:00:01,675 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 18:00:01,675 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 16, 15] total 47 [2022-11-25 18:00:01,675 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [438619434] [2022-11-25 18:00:01,675 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 18:00:01,676 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2022-11-25 18:00:01,676 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-25 18:00:01,677 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2022-11-25 18:00:01,677 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=254, Invalid=1908, Unknown=0, NotChecked=0, Total=2162 [2022-11-25 18:00:01,677 INFO L87 Difference]: Start difference. First operand 751 states and 963 transitions. Second operand has 47 states, 47 states have (on average 2.851063829787234) internal successors, (134), 47 states have internal predecessors, (134), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-25 18:00:23,060 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 18:00:23,060 INFO L93 Difference]: Finished difference Result 4804 states and 6217 transitions. [2022-11-25 18:00:23,061 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 148 states. [2022-11-25 18:00:23,061 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 2.851063829787234) internal successors, (134), 47 states have internal predecessors, (134), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 75 [2022-11-25 18:00:23,061 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 18:00:23,066 INFO L225 Difference]: With dead ends: 4804 [2022-11-25 18:00:23,066 INFO L226 Difference]: Without dead ends: 4096 [2022-11-25 18:00:23,068 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 308 GetRequests, 127 SyntacticMatches, 2 SemanticMatches, 179 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9533 ImplicationChecksByTransitivity, 11.3s TimeCoverageRelationStatistics Valid=2985, Invalid=29595, Unknown=0, NotChecked=0, Total=32580 [2022-11-25 18:00:23,069 INFO L413 NwaCegarLoop]: 342 mSDtfsCounter, 3176 mSDsluCounter, 6918 mSDsCounter, 0 mSdLazyCounter, 6502 mSolverCounterSat, 246 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3176 SdHoareTripleChecker+Valid, 7260 SdHoareTripleChecker+Invalid, 6748 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 246 IncrementalHoareTripleChecker+Valid, 6502 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.7s IncrementalHoareTripleChecker+Time [2022-11-25 18:00:23,069 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3176 Valid, 7260 Invalid, 6748 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [246 Valid, 6502 Invalid, 0 Unknown, 0 Unchecked, 4.7s Time] [2022-11-25 18:00:23,073 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4096 states. [2022-11-25 18:00:23,880 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4096 to 722. [2022-11-25 18:00:23,881 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 722 states, 696 states have (on average 1.2729885057471264) internal successors, (886), 699 states have internal predecessors, (886), 18 states have call successors, (18), 7 states have call predecessors, (18), 7 states have return successors, (16), 15 states have call predecessors, (16), 16 states have call successors, (16) [2022-11-25 18:00:23,882 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 722 states to 722 states and 920 transitions. [2022-11-25 18:00:23,882 INFO L78 Accepts]: Start accepts. Automaton has 722 states and 920 transitions. Word has length 75 [2022-11-25 18:00:23,882 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 18:00:23,883 INFO L495 AbstractCegarLoop]: Abstraction has 722 states and 920 transitions. [2022-11-25 18:00:23,883 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 47 states have (on average 2.851063829787234) internal successors, (134), 47 states have internal predecessors, (134), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-25 18:00:23,883 INFO L276 IsEmpty]: Start isEmpty. Operand 722 states and 920 transitions. [2022-11-25 18:00:23,885 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2022-11-25 18:00:23,885 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 18:00:23,886 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 18:00:23,894 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Forceful destruction successful, exit code 0 [2022-11-25 18:00:24,094 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable53 [2022-11-25 18:00:24,094 INFO L420 AbstractCegarLoop]: === Iteration 55 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 18:00:24,094 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 18:00:24,094 INFO L85 PathProgramCache]: Analyzing trace with hash -75104113, now seen corresponding path program 1 times [2022-11-25 18:00:24,094 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-25 18:00:24,095 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [36748194] [2022-11-25 18:00:24,095 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 18:00:24,095 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 18:00:24,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 18:00:25,488 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-11-25 18:00:25,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 18:00:25,490 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-11-25 18:00:25,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 18:00:25,491 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 44 [2022-11-25 18:00:25,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 18:00:25,494 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 54 [2022-11-25 18:00:25,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 18:00:25,498 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 64 [2022-11-25 18:00:25,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 18:00:25,502 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 2 proven. 29 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2022-11-25 18:00:25,502 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-25 18:00:25,502 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [36748194] [2022-11-25 18:00:25,503 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [36748194] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 18:00:25,503 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [698635201] [2022-11-25 18:00:25,503 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 18:00:25,503 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 18:00:25,504 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 [2022-11-25 18:00:25,507 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 18:00:25,512 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Waiting until timeout for monitored process [2022-11-25 18:00:25,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 18:00:25,709 INFO L263 TraceCheckSpWp]: Trace formula consists of 265 conjuncts, 44 conjunts are in the unsatisfiable core [2022-11-25 18:00:25,712 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 18:00:26,271 INFO L321 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2022-11-25 18:00:26,272 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 27 treesize of output 15 [2022-11-25 18:00:26,347 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 24 proven. 7 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2022-11-25 18:00:26,347 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 18:00:26,630 INFO L321 Elim1Store]: treesize reduction 15, result has 84.2 percent of original size [2022-11-25 18:00:26,631 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 35 treesize of output 87 [2022-11-25 18:00:26,975 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 14 proven. 6 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2022-11-25 18:00:26,976 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [698635201] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 18:00:26,976 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 18:00:26,976 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 13, 10] total 35 [2022-11-25 18:00:26,977 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1975781080] [2022-11-25 18:00:26,977 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 18:00:26,978 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-11-25 18:00:26,978 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-25 18:00:26,978 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-11-25 18:00:26,979 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=1072, Unknown=0, NotChecked=0, Total=1190 [2022-11-25 18:00:26,980 INFO L87 Difference]: Start difference. First operand 722 states and 920 transitions. Second operand has 35 states, 33 states have (on average 3.6666666666666665) internal successors, (121), 34 states have internal predecessors, (121), 9 states have call successors, (12), 4 states have call predecessors, (12), 4 states have return successors, (10), 7 states have call predecessors, (10), 8 states have call successors, (10) [2022-11-25 18:00:28,811 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.67s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-25 18:00:30,849 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-25 18:00:32,881 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-25 18:00:34,780 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.85s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-25 18:00:37,911 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 18:00:37,911 INFO L93 Difference]: Finished difference Result 943 states and 1206 transitions. [2022-11-25 18:00:37,911 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-11-25 18:00:37,911 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 33 states have (on average 3.6666666666666665) internal successors, (121), 34 states have internal predecessors, (121), 9 states have call successors, (12), 4 states have call predecessors, (12), 4 states have return successors, (10), 7 states have call predecessors, (10), 8 states have call successors, (10) Word has length 79 [2022-11-25 18:00:37,912 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 18:00:37,913 INFO L225 Difference]: With dead ends: 943 [2022-11-25 18:00:37,913 INFO L226 Difference]: Without dead ends: 909 [2022-11-25 18:00:37,913 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 205 GetRequests, 151 SyntacticMatches, 2 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 625 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=316, Invalid=2546, Unknown=0, NotChecked=0, Total=2862 [2022-11-25 18:00:37,914 INFO L413 NwaCegarLoop]: 91 mSDtfsCounter, 344 mSDsluCounter, 1759 mSDsCounter, 0 mSdLazyCounter, 1770 mSolverCounterSat, 69 mSolverCounterUnsat, 4 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 348 SdHoareTripleChecker+Valid, 1850 SdHoareTripleChecker+Invalid, 1843 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 69 IncrementalHoareTripleChecker+Valid, 1770 IncrementalHoareTripleChecker+Invalid, 4 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.9s IncrementalHoareTripleChecker+Time [2022-11-25 18:00:37,914 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [348 Valid, 1850 Invalid, 1843 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [69 Valid, 1770 Invalid, 4 Unknown, 0 Unchecked, 8.9s Time] [2022-11-25 18:00:37,914 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 909 states. [2022-11-25 18:00:38,729 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 909 to 797. [2022-11-25 18:00:38,730 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 797 states, 768 states have (on average 1.2747395833333333) internal successors, (979), 771 states have internal predecessors, (979), 20 states have call successors, (20), 9 states have call predecessors, (20), 8 states have return successors, (17), 16 states have call predecessors, (17), 17 states have call successors, (17) [2022-11-25 18:00:38,731 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 797 states to 797 states and 1016 transitions. [2022-11-25 18:00:38,731 INFO L78 Accepts]: Start accepts. Automaton has 797 states and 1016 transitions. Word has length 79 [2022-11-25 18:00:38,731 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 18:00:38,732 INFO L495 AbstractCegarLoop]: Abstraction has 797 states and 1016 transitions. [2022-11-25 18:00:38,732 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 33 states have (on average 3.6666666666666665) internal successors, (121), 34 states have internal predecessors, (121), 9 states have call successors, (12), 4 states have call predecessors, (12), 4 states have return successors, (10), 7 states have call predecessors, (10), 8 states have call successors, (10) [2022-11-25 18:00:38,732 INFO L276 IsEmpty]: Start isEmpty. Operand 797 states and 1016 transitions. [2022-11-25 18:00:38,733 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2022-11-25 18:00:38,733 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 18:00:38,733 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 18:00:38,739 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Forceful destruction successful, exit code 0 [2022-11-25 18:00:38,939 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable54,47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 18:00:38,939 INFO L420 AbstractCegarLoop]: === Iteration 56 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 18:00:38,939 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 18:00:38,940 INFO L85 PathProgramCache]: Analyzing trace with hash -1771822365, now seen corresponding path program 2 times [2022-11-25 18:00:38,940 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-25 18:00:38,940 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [678960035] [2022-11-25 18:00:38,940 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 18:00:38,940 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 18:00:38,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 18:00:40,215 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-11-25 18:00:40,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 18:00:40,217 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-11-25 18:00:40,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 18:00:40,218 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 44 [2022-11-25 18:00:40,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 18:00:40,222 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 54 [2022-11-25 18:00:40,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 18:00:40,225 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 64 [2022-11-25 18:00:40,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 18:00:40,227 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 2 proven. 29 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2022-11-25 18:00:40,228 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-25 18:00:40,228 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [678960035] [2022-11-25 18:00:40,228 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [678960035] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 18:00:40,228 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [993487765] [2022-11-25 18:00:40,228 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-25 18:00:40,228 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 18:00:40,228 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 [2022-11-25 18:00:40,229 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 18:00:40,233 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Waiting until timeout for monitored process [2022-11-25 18:00:40,398 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-25 18:00:40,398 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 18:00:40,401 INFO L263 TraceCheckSpWp]: Trace formula consists of 265 conjuncts, 69 conjunts are in the unsatisfiable core [2022-11-25 18:00:40,402 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 18:00:41,390 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-25 18:00:41,390 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 26 treesize of output 10 [2022-11-25 18:00:41,439 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 19 proven. 38 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-11-25 18:00:41,439 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 18:00:41,753 INFO L321 Elim1Store]: treesize reduction 19, result has 81.6 percent of original size [2022-11-25 18:00:41,753 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 91 [2022-11-25 18:00:42,792 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 2 proven. 20 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2022-11-25 18:00:42,793 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [993487765] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 18:00:42,793 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 18:00:42,793 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 23, 15] total 40 [2022-11-25 18:00:42,794 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1271842826] [2022-11-25 18:00:42,794 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 18:00:42,794 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2022-11-25 18:00:42,794 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-25 18:00:42,795 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2022-11-25 18:00:42,795 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=145, Invalid=1415, Unknown=0, NotChecked=0, Total=1560 [2022-11-25 18:00:42,796 INFO L87 Difference]: Start difference. First operand 797 states and 1016 transitions. Second operand has 40 states, 39 states have (on average 3.3076923076923075) internal successors, (129), 38 states have internal predecessors, (129), 9 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (11), 8 states have call predecessors, (11), 8 states have call successors, (11) [2022-11-25 18:00:44,845 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-25 18:00:46,879 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-25 18:00:48,919 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-25 18:00:50,965 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-25 18:00:53,007 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-25 18:00:55,894 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 18:00:55,894 INFO L93 Difference]: Finished difference Result 1200 states and 1536 transitions. [2022-11-25 18:00:55,894 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-11-25 18:00:55,894 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 39 states have (on average 3.3076923076923075) internal successors, (129), 38 states have internal predecessors, (129), 9 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (11), 8 states have call predecessors, (11), 8 states have call successors, (11) Word has length 79 [2022-11-25 18:00:55,895 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 18:00:55,896 INFO L225 Difference]: With dead ends: 1200 [2022-11-25 18:00:55,896 INFO L226 Difference]: Without dead ends: 1054 [2022-11-25 18:00:55,897 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 197 GetRequests, 138 SyntacticMatches, 10 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 736 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=258, Invalid=2292, Unknown=0, NotChecked=0, Total=2550 [2022-11-25 18:00:55,897 INFO L413 NwaCegarLoop]: 105 mSDtfsCounter, 182 mSDsluCounter, 2063 mSDsCounter, 0 mSdLazyCounter, 1719 mSolverCounterSat, 44 mSolverCounterUnsat, 5 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 11.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 186 SdHoareTripleChecker+Valid, 2168 SdHoareTripleChecker+Invalid, 1768 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 44 IncrementalHoareTripleChecker+Valid, 1719 IncrementalHoareTripleChecker+Invalid, 5 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 11.3s IncrementalHoareTripleChecker+Time [2022-11-25 18:00:55,898 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [186 Valid, 2168 Invalid, 1768 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [44 Valid, 1719 Invalid, 5 Unknown, 0 Unchecked, 11.3s Time] [2022-11-25 18:00:55,899 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1054 states. [2022-11-25 18:00:56,869 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1054 to 938. [2022-11-25 18:00:56,869 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 938 states, 897 states have (on average 1.2731326644370122) internal successors, (1142), 902 states have internal predecessors, (1142), 28 states have call successors, (28), 13 states have call predecessors, (28), 12 states have return successors, (24), 22 states have call predecessors, (24), 24 states have call successors, (24) [2022-11-25 18:00:56,871 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 938 states to 938 states and 1194 transitions. [2022-11-25 18:00:56,871 INFO L78 Accepts]: Start accepts. Automaton has 938 states and 1194 transitions. Word has length 79 [2022-11-25 18:00:56,871 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 18:00:56,871 INFO L495 AbstractCegarLoop]: Abstraction has 938 states and 1194 transitions. [2022-11-25 18:00:56,871 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 39 states have (on average 3.3076923076923075) internal successors, (129), 38 states have internal predecessors, (129), 9 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (11), 8 states have call predecessors, (11), 8 states have call successors, (11) [2022-11-25 18:00:56,872 INFO L276 IsEmpty]: Start isEmpty. Operand 938 states and 1194 transitions. [2022-11-25 18:00:56,872 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2022-11-25 18:00:56,873 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 18:00:56,873 INFO L195 NwaCegarLoop]: trace histogram [9, 9, 9, 4, 4, 4, 4, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 18:00:56,878 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Ended with exit code 0 [2022-11-25 18:00:57,073 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable55,48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 18:00:57,073 INFO L420 AbstractCegarLoop]: === Iteration 57 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 18:00:57,074 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 18:00:57,074 INFO L85 PathProgramCache]: Analyzing trace with hash 1089634329, now seen corresponding path program 4 times [2022-11-25 18:00:57,074 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-25 18:00:57,074 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1151000221] [2022-11-25 18:00:57,074 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 18:00:57,074 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 18:00:57,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 18:00:57,452 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-11-25 18:00:57,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 18:00:57,454 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-11-25 18:00:57,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 18:00:57,456 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 117 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2022-11-25 18:00:57,456 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-25 18:00:57,456 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1151000221] [2022-11-25 18:00:57,456 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1151000221] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 18:00:57,456 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1050874540] [2022-11-25 18:00:57,456 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 18:00:57,457 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 18:00:57,457 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 [2022-11-25 18:00:57,460 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 18:00:57,479 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Waiting until timeout for monitored process [2022-11-25 18:00:57,669 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 18:00:57,669 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 18:00:57,671 INFO L263 TraceCheckSpWp]: Trace formula consists of 313 conjuncts, 22 conjunts are in the unsatisfiable core [2022-11-25 18:00:57,673 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 18:00:57,979 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 65 proven. 38 refuted. 0 times theorem prover too weak. 53 trivial. 0 not checked. [2022-11-25 18:00:57,979 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 18:00:58,370 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 65 proven. 38 refuted. 0 times theorem prover too weak. 53 trivial. 0 not checked. [2022-11-25 18:00:58,371 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1050874540] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 18:00:58,371 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 18:00:58,371 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13, 13] total 35 [2022-11-25 18:00:58,371 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [107316763] [2022-11-25 18:00:58,372 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 18:00:58,372 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-11-25 18:00:58,372 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-25 18:00:58,373 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-11-25 18:00:58,373 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=1088, Unknown=0, NotChecked=0, Total=1190 [2022-11-25 18:00:58,373 INFO L87 Difference]: Start difference. First operand 938 states and 1194 transitions. Second operand has 35 states, 35 states have (on average 3.4) internal successors, (119), 34 states have internal predecessors, (119), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-25 18:01:01,960 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 18:01:01,960 INFO L93 Difference]: Finished difference Result 1656 states and 2106 transitions. [2022-11-25 18:01:01,960 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2022-11-25 18:01:01,960 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 3.4) internal successors, (119), 34 states have internal predecessors, (119), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 77 [2022-11-25 18:01:01,961 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 18:01:01,963 INFO L225 Difference]: With dead ends: 1656 [2022-11-25 18:01:01,963 INFO L226 Difference]: Without dead ends: 1344 [2022-11-25 18:01:01,964 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 192 GetRequests, 139 SyntacticMatches, 0 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 263 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=309, Invalid=2661, Unknown=0, NotChecked=0, Total=2970 [2022-11-25 18:01:01,964 INFO L413 NwaCegarLoop]: 114 mSDtfsCounter, 220 mSDsluCounter, 2490 mSDsCounter, 0 mSdLazyCounter, 1909 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 220 SdHoareTripleChecker+Valid, 2604 SdHoareTripleChecker+Invalid, 1936 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 1909 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-11-25 18:01:01,965 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [220 Valid, 2604 Invalid, 1936 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 1909 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-11-25 18:01:01,966 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1344 states. [2022-11-25 18:01:03,011 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1344 to 1002. [2022-11-25 18:01:03,011 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1002 states, 961 states have (on average 1.2736732570239333) internal successors, (1224), 966 states have internal predecessors, (1224), 28 states have call successors, (28), 13 states have call predecessors, (28), 12 states have return successors, (24), 22 states have call predecessors, (24), 24 states have call successors, (24) [2022-11-25 18:01:03,012 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1002 states to 1002 states and 1276 transitions. [2022-11-25 18:01:03,013 INFO L78 Accepts]: Start accepts. Automaton has 1002 states and 1276 transitions. Word has length 77 [2022-11-25 18:01:03,013 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 18:01:03,013 INFO L495 AbstractCegarLoop]: Abstraction has 1002 states and 1276 transitions. [2022-11-25 18:01:03,013 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 3.4) internal successors, (119), 34 states have internal predecessors, (119), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-25 18:01:03,013 INFO L276 IsEmpty]: Start isEmpty. Operand 1002 states and 1276 transitions. [2022-11-25 18:01:03,015 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2022-11-25 18:01:03,015 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 18:01:03,015 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 4, 4, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 18:01:03,020 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Forceful destruction successful, exit code 0 [2022-11-25 18:01:03,216 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable56 [2022-11-25 18:01:03,216 INFO L420 AbstractCegarLoop]: === Iteration 58 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 18:01:03,216 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 18:01:03,216 INFO L85 PathProgramCache]: Analyzing trace with hash 1281507689, now seen corresponding path program 16 times [2022-11-25 18:01:03,216 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-25 18:01:03,216 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1685884850] [2022-11-25 18:01:03,217 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 18:01:03,217 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 18:01:03,263 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 18:01:04,962 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-11-25 18:01:04,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 18:01:04,963 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-11-25 18:01:04,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 18:01:04,965 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 9 proven. 78 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2022-11-25 18:01:04,966 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-25 18:01:04,966 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1685884850] [2022-11-25 18:01:04,966 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1685884850] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 18:01:04,966 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [569986648] [2022-11-25 18:01:04,966 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 18:01:04,966 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 18:01:04,966 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 [2022-11-25 18:01:04,967 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 18:01:04,970 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Waiting until timeout for monitored process [2022-11-25 18:01:05,202 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 18:01:05,202 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 18:01:05,205 INFO L263 TraceCheckSpWp]: Trace formula consists of 313 conjuncts, 89 conjunts are in the unsatisfiable core [2022-11-25 18:01:05,207 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 18:01:07,902 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-25 18:01:07,903 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 27 treesize of output 11 [2022-11-25 18:01:07,963 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 12 proven. 101 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-25 18:01:07,964 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 18:01:09,629 INFO L321 Elim1Store]: treesize reduction 17, result has 83.5 percent of original size [2022-11-25 18:01:09,629 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 93 [2022-11-25 18:01:12,297 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 9 proven. 53 refuted. 0 times theorem prover too weak. 54 trivial. 0 not checked. [2022-11-25 18:01:12,297 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [569986648] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 18:01:12,297 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 18:01:12,297 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 31, 21] total 73 [2022-11-25 18:01:12,297 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2138642459] [2022-11-25 18:01:12,297 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 18:01:12,298 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 73 states [2022-11-25 18:01:12,298 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-25 18:01:12,299 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2022-11-25 18:01:12,299 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=388, Invalid=4868, Unknown=0, NotChecked=0, Total=5256 [2022-11-25 18:01:12,299 INFO L87 Difference]: Start difference. First operand 1002 states and 1276 transitions. Second operand has 73 states, 73 states have (on average 2.328767123287671) internal successors, (170), 72 states have internal predecessors, (170), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2022-11-25 18:01:33,799 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 18:01:33,800 INFO L93 Difference]: Finished difference Result 2042 states and 2634 transitions. [2022-11-25 18:01:33,800 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 88 states. [2022-11-25 18:01:33,800 INFO L78 Accepts]: Start accepts. Automaton has has 73 states, 73 states have (on average 2.328767123287671) internal successors, (170), 72 states have internal predecessors, (170), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 78 [2022-11-25 18:01:33,800 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 18:01:33,805 INFO L225 Difference]: With dead ends: 2042 [2022-11-25 18:01:33,805 INFO L226 Difference]: Without dead ends: 2002 [2022-11-25 18:01:33,807 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 253 GetRequests, 113 SyntacticMatches, 0 SemanticMatches, 140 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5293 ImplicationChecksByTransitivity, 15.0s TimeCoverageRelationStatistics Valid=1631, Invalid=18391, Unknown=0, NotChecked=0, Total=20022 [2022-11-25 18:01:33,808 INFO L413 NwaCegarLoop]: 151 mSDtfsCounter, 1243 mSDsluCounter, 4170 mSDsCounter, 0 mSdLazyCounter, 8114 mSolverCounterSat, 270 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1251 SdHoareTripleChecker+Valid, 4321 SdHoareTripleChecker+Invalid, 8384 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 270 IncrementalHoareTripleChecker+Valid, 8114 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.8s IncrementalHoareTripleChecker+Time [2022-11-25 18:01:33,808 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1251 Valid, 4321 Invalid, 8384 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [270 Valid, 8114 Invalid, 0 Unknown, 0 Unchecked, 7.8s Time] [2022-11-25 18:01:33,810 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2002 states. [2022-11-25 18:01:35,518 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2002 to 1014. [2022-11-25 18:01:35,519 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1014 states, 973 states have (on average 1.2733812949640289) internal successors, (1239), 978 states have internal predecessors, (1239), 28 states have call successors, (28), 13 states have call predecessors, (28), 12 states have return successors, (24), 22 states have call predecessors, (24), 24 states have call successors, (24) [2022-11-25 18:01:35,520 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1014 states to 1014 states and 1291 transitions. [2022-11-25 18:01:35,520 INFO L78 Accepts]: Start accepts. Automaton has 1014 states and 1291 transitions. Word has length 78 [2022-11-25 18:01:35,520 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 18:01:35,520 INFO L495 AbstractCegarLoop]: Abstraction has 1014 states and 1291 transitions. [2022-11-25 18:01:35,521 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 73 states, 73 states have (on average 2.328767123287671) internal successors, (170), 72 states have internal predecessors, (170), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2022-11-25 18:01:35,521 INFO L276 IsEmpty]: Start isEmpty. Operand 1014 states and 1291 transitions. [2022-11-25 18:01:35,523 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2022-11-25 18:01:35,523 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 18:01:35,523 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 4, 4, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 18:01:35,530 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Forceful destruction successful, exit code 0 [2022-11-25 18:01:35,727 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable57,50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 18:01:35,727 INFO L420 AbstractCegarLoop]: === Iteration 59 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 18:01:35,728 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 18:01:35,728 INFO L85 PathProgramCache]: Analyzing trace with hash -963092143, now seen corresponding path program 17 times [2022-11-25 18:01:35,728 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-25 18:01:35,728 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1799118489] [2022-11-25 18:01:35,728 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 18:01:35,728 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 18:01:35,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 18:01:37,740 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-11-25 18:01:37,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 18:01:37,742 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-11-25 18:01:37,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 18:01:37,745 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 9 proven. 78 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2022-11-25 18:01:37,746 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-25 18:01:37,746 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1799118489] [2022-11-25 18:01:37,746 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1799118489] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 18:01:37,746 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1545559825] [2022-11-25 18:01:37,746 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2022-11-25 18:01:37,747 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 18:01:37,747 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 [2022-11-25 18:01:37,752 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 18:01:37,754 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Waiting until timeout for monitored process [2022-11-25 18:01:57,826 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2022-11-25 18:01:57,826 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 18:01:57,835 INFO L263 TraceCheckSpWp]: Trace formula consists of 313 conjuncts, 94 conjunts are in the unsatisfiable core [2022-11-25 18:01:57,837 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 18:01:58,496 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-25 18:01:59,373 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 18:01:59,374 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 18:01:59,375 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 18:01:59,378 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-25 18:01:59,378 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 78 treesize of output 39 [2022-11-25 18:01:59,422 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 12 proven. 102 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-25 18:01:59,422 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 18:02:01,218 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 6 proven. 56 refuted. 0 times theorem prover too weak. 54 trivial. 0 not checked. [2022-11-25 18:02:01,218 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1545559825] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 18:02:01,218 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 18:02:01,218 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 34, 22] total 64 [2022-11-25 18:02:01,218 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1173329230] [2022-11-25 18:02:01,219 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 18:02:01,219 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 64 states [2022-11-25 18:02:01,219 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-25 18:02:01,220 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2022-11-25 18:02:01,220 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=337, Invalid=3695, Unknown=0, NotChecked=0, Total=4032 [2022-11-25 18:02:01,220 INFO L87 Difference]: Start difference. First operand 1014 states and 1291 transitions. Second operand has 64 states, 64 states have (on average 2.265625) internal successors, (145), 62 states have internal predecessors, (145), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2022-11-25 18:02:24,020 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 18:02:24,020 INFO L93 Difference]: Finished difference Result 2679 states and 3452 transitions. [2022-11-25 18:02:24,021 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 112 states. [2022-11-25 18:02:24,021 INFO L78 Accepts]: Start accepts. Automaton has has 64 states, 64 states have (on average 2.265625) internal successors, (145), 62 states have internal predecessors, (145), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 78 [2022-11-25 18:02:24,023 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 18:02:24,028 INFO L225 Difference]: With dead ends: 2679 [2022-11-25 18:02:24,028 INFO L226 Difference]: Without dead ends: 2639 [2022-11-25 18:02:24,030 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 282 GetRequests, 115 SyntacticMatches, 7 SemanticMatches, 160 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7002 ImplicationChecksByTransitivity, 9.9s TimeCoverageRelationStatistics Valid=2215, Invalid=23867, Unknown=0, NotChecked=0, Total=26082 [2022-11-25 18:02:24,030 INFO L413 NwaCegarLoop]: 319 mSDtfsCounter, 2550 mSDsluCounter, 8912 mSDsCounter, 0 mSdLazyCounter, 12696 mSolverCounterSat, 701 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 9.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2550 SdHoareTripleChecker+Valid, 9231 SdHoareTripleChecker+Invalid, 13397 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 701 IncrementalHoareTripleChecker+Valid, 12696 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 10.8s IncrementalHoareTripleChecker+Time [2022-11-25 18:02:24,030 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2550 Valid, 9231 Invalid, 13397 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [701 Valid, 12696 Invalid, 0 Unknown, 0 Unchecked, 10.8s Time] [2022-11-25 18:02:24,032 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2639 states. [2022-11-25 18:02:25,370 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2639 to 1029. [2022-11-25 18:02:25,371 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1029 states, 988 states have (on average 1.2732793522267207) internal successors, (1258), 993 states have internal predecessors, (1258), 28 states have call successors, (28), 13 states have call predecessors, (28), 12 states have return successors, (24), 22 states have call predecessors, (24), 24 states have call successors, (24) [2022-11-25 18:02:25,372 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1029 states to 1029 states and 1310 transitions. [2022-11-25 18:02:25,372 INFO L78 Accepts]: Start accepts. Automaton has 1029 states and 1310 transitions. Word has length 78 [2022-11-25 18:02:25,373 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 18:02:25,373 INFO L495 AbstractCegarLoop]: Abstraction has 1029 states and 1310 transitions. [2022-11-25 18:02:25,373 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 64 states, 64 states have (on average 2.265625) internal successors, (145), 62 states have internal predecessors, (145), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2022-11-25 18:02:25,373 INFO L276 IsEmpty]: Start isEmpty. Operand 1029 states and 1310 transitions. [2022-11-25 18:02:25,375 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2022-11-25 18:02:25,375 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 18:02:25,375 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 4, 4, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 18:02:25,383 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Forceful destruction successful, exit code 0 [2022-11-25 18:02:25,575 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable58 [2022-11-25 18:02:25,576 INFO L420 AbstractCegarLoop]: === Iteration 60 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 18:02:25,576 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 18:02:25,576 INFO L85 PathProgramCache]: Analyzing trace with hash -871331223, now seen corresponding path program 18 times [2022-11-25 18:02:25,577 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-25 18:02:25,577 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1903941907] [2022-11-25 18:02:25,577 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 18:02:25,577 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 18:02:25,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 18:02:27,499 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-11-25 18:02:27,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 18:02:27,501 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-11-25 18:02:27,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 18:02:27,503 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 9 proven. 78 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2022-11-25 18:02:27,503 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-25 18:02:27,503 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1903941907] [2022-11-25 18:02:27,503 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1903941907] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 18:02:27,503 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [892894391] [2022-11-25 18:02:27,503 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-11-25 18:02:27,504 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 18:02:27,504 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 [2022-11-25 18:02:27,505 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 18:02:27,507 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Waiting until timeout for monitored process [2022-11-25 18:02:32,004 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 6 check-sat command(s) [2022-11-25 18:02:32,004 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 18:02:32,012 INFO L263 TraceCheckSpWp]: Trace formula consists of 313 conjuncts, 83 conjunts are in the unsatisfiable core [2022-11-25 18:02:32,014 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 18:02:34,648 INFO L321 Elim1Store]: treesize reduction 3, result has 75.0 percent of original size [2022-11-25 18:02:34,649 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 31 treesize of output 20 [2022-11-25 18:02:34,697 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 9 proven. 104 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-25 18:02:34,697 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 18:02:36,441 INFO L321 Elim1Store]: treesize reduction 17, result has 83.5 percent of original size [2022-11-25 18:02:36,442 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 93 [2022-11-25 18:02:38,521 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 9 proven. 53 refuted. 0 times theorem prover too weak. 54 trivial. 0 not checked. [2022-11-25 18:02:38,521 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [892894391] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 18:02:38,522 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 18:02:38,522 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 31, 19] total 70 [2022-11-25 18:02:38,522 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [484146527] [2022-11-25 18:02:38,522 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 18:02:38,522 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 70 states [2022-11-25 18:02:38,522 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-25 18:02:38,523 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2022-11-25 18:02:38,524 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=299, Invalid=4531, Unknown=0, NotChecked=0, Total=4830 [2022-11-25 18:02:38,524 INFO L87 Difference]: Start difference. First operand 1029 states and 1310 transitions. Second operand has 70 states, 70 states have (on average 2.3714285714285714) internal successors, (166), 69 states have internal predecessors, (166), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-11-25 18:02:58,726 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 18:02:58,726 INFO L93 Difference]: Finished difference Result 2215 states and 2854 transitions. [2022-11-25 18:02:58,727 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2022-11-25 18:02:58,727 INFO L78 Accepts]: Start accepts. Automaton has has 70 states, 70 states have (on average 2.3714285714285714) internal successors, (166), 69 states have internal predecessors, (166), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 78 [2022-11-25 18:02:58,727 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 18:02:58,733 INFO L225 Difference]: With dead ends: 2215 [2022-11-25 18:02:58,733 INFO L226 Difference]: Without dead ends: 2071 [2022-11-25 18:02:58,735 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 240 GetRequests, 116 SyntacticMatches, 0 SemanticMatches, 124 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3964 ImplicationChecksByTransitivity, 12.4s TimeCoverageRelationStatistics Valid=1167, Invalid=14583, Unknown=0, NotChecked=0, Total=15750 [2022-11-25 18:02:58,736 INFO L413 NwaCegarLoop]: 189 mSDtfsCounter, 1274 mSDsluCounter, 6141 mSDsCounter, 0 mSdLazyCounter, 8420 mSolverCounterSat, 254 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1274 SdHoareTripleChecker+Valid, 6330 SdHoareTripleChecker+Invalid, 8674 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 254 IncrementalHoareTripleChecker+Valid, 8420 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.0s IncrementalHoareTripleChecker+Time [2022-11-25 18:02:58,736 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1274 Valid, 6330 Invalid, 8674 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [254 Valid, 8420 Invalid, 0 Unknown, 0 Unchecked, 8.0s Time] [2022-11-25 18:02:58,739 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2071 states. [2022-11-25 18:03:00,569 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2071 to 1047. [2022-11-25 18:03:00,570 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1047 states, 1006 states have (on average 1.2733598409542743) internal successors, (1281), 1011 states have internal predecessors, (1281), 28 states have call successors, (28), 13 states have call predecessors, (28), 12 states have return successors, (24), 22 states have call predecessors, (24), 24 states have call successors, (24) [2022-11-25 18:03:00,571 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1047 states to 1047 states and 1333 transitions. [2022-11-25 18:03:00,572 INFO L78 Accepts]: Start accepts. Automaton has 1047 states and 1333 transitions. Word has length 78 [2022-11-25 18:03:00,572 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 18:03:00,572 INFO L495 AbstractCegarLoop]: Abstraction has 1047 states and 1333 transitions. [2022-11-25 18:03:00,572 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 70 states, 70 states have (on average 2.3714285714285714) internal successors, (166), 69 states have internal predecessors, (166), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-11-25 18:03:00,573 INFO L276 IsEmpty]: Start isEmpty. Operand 1047 states and 1333 transitions. [2022-11-25 18:03:00,575 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2022-11-25 18:03:00,575 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 18:03:00,575 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 4, 4, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 18:03:00,585 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Ended with exit code 0 [2022-11-25 18:03:00,782 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 52 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable59 [2022-11-25 18:03:00,783 INFO L420 AbstractCegarLoop]: === Iteration 61 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 18:03:00,783 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 18:03:00,783 INFO L85 PathProgramCache]: Analyzing trace with hash -1748727147, now seen corresponding path program 19 times [2022-11-25 18:03:00,783 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-25 18:03:00,783 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1182491889] [2022-11-25 18:03:00,784 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 18:03:00,784 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 18:03:00,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 18:03:02,685 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-11-25 18:03:02,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 18:03:02,687 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-11-25 18:03:02,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 18:03:02,689 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 9 proven. 78 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2022-11-25 18:03:02,690 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-25 18:03:02,690 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1182491889] [2022-11-25 18:03:02,690 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1182491889] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 18:03:02,690 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1283955156] [2022-11-25 18:03:02,690 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-25 18:03:02,690 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 18:03:02,690 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 [2022-11-25 18:03:02,692 INFO L229 MonitoredProcess]: Starting monitored process 53 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 18:03:02,696 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Waiting until timeout for monitored process [2022-11-25 18:03:03,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 18:03:03,055 INFO L263 TraceCheckSpWp]: Trace formula consists of 313 conjuncts, 71 conjunts are in the unsatisfiable core [2022-11-25 18:03:03,058 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 18:03:05,497 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 18:03:05,498 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 18:03:05,499 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 18:03:05,514 INFO L321 Elim1Store]: treesize reduction 32, result has 17.9 percent of original size [2022-11-25 18:03:05,515 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 1 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 10 case distinctions, treesize of input 75 treesize of output 41 [2022-11-25 18:03:05,615 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 24 proven. 68 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-11-25 18:03:05,615 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 18:03:06,571 INFO L321 Elim1Store]: treesize reduction 19, result has 81.2 percent of original size [2022-11-25 18:03:06,571 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 89 [2022-11-25 18:03:07,888 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 23 proven. 28 refuted. 0 times theorem prover too weak. 65 trivial. 0 not checked. [2022-11-25 18:03:07,888 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1283955156] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 18:03:07,889 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 18:03:07,889 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 23, 13] total 57 [2022-11-25 18:03:07,889 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1057245466] [2022-11-25 18:03:07,889 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 18:03:07,889 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 57 states [2022-11-25 18:03:07,890 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-25 18:03:07,890 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2022-11-25 18:03:07,891 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=243, Invalid=2949, Unknown=0, NotChecked=0, Total=3192 [2022-11-25 18:03:07,891 INFO L87 Difference]: Start difference. First operand 1047 states and 1333 transitions. Second operand has 57 states, 57 states have (on average 2.6315789473684212) internal successors, (150), 56 states have internal predecessors, (150), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2022-11-25 18:03:24,759 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 18:03:24,759 INFO L93 Difference]: Finished difference Result 2643 states and 3418 transitions. [2022-11-25 18:03:24,760 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 89 states. [2022-11-25 18:03:24,760 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 57 states have (on average 2.6315789473684212) internal successors, (150), 56 states have internal predecessors, (150), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 78 [2022-11-25 18:03:24,760 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 18:03:24,765 INFO L225 Difference]: With dead ends: 2643 [2022-11-25 18:03:24,765 INFO L226 Difference]: Without dead ends: 2493 [2022-11-25 18:03:24,767 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 257 GetRequests, 129 SyntacticMatches, 0 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4171 ImplicationChecksByTransitivity, 9.3s TimeCoverageRelationStatistics Valid=1413, Invalid=15357, Unknown=0, NotChecked=0, Total=16770 [2022-11-25 18:03:24,767 INFO L413 NwaCegarLoop]: 178 mSDtfsCounter, 1395 mSDsluCounter, 4686 mSDsCounter, 0 mSdLazyCounter, 7731 mSolverCounterSat, 262 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1399 SdHoareTripleChecker+Valid, 4864 SdHoareTripleChecker+Invalid, 7993 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 262 IncrementalHoareTripleChecker+Valid, 7731 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.3s IncrementalHoareTripleChecker+Time [2022-11-25 18:03:24,768 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1399 Valid, 4864 Invalid, 7993 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [262 Valid, 7731 Invalid, 0 Unknown, 0 Unchecked, 6.3s Time] [2022-11-25 18:03:24,770 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2493 states. [2022-11-25 18:03:26,160 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2493 to 1056. [2022-11-25 18:03:26,161 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1056 states, 1015 states have (on average 1.269950738916256) internal successors, (1289), 1020 states have internal predecessors, (1289), 28 states have call successors, (28), 13 states have call predecessors, (28), 12 states have return successors, (24), 22 states have call predecessors, (24), 24 states have call successors, (24) [2022-11-25 18:03:26,162 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1056 states to 1056 states and 1341 transitions. [2022-11-25 18:03:26,163 INFO L78 Accepts]: Start accepts. Automaton has 1056 states and 1341 transitions. Word has length 78 [2022-11-25 18:03:26,163 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 18:03:26,163 INFO L495 AbstractCegarLoop]: Abstraction has 1056 states and 1341 transitions. [2022-11-25 18:03:26,163 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 57 states, 57 states have (on average 2.6315789473684212) internal successors, (150), 56 states have internal predecessors, (150), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2022-11-25 18:03:26,163 INFO L276 IsEmpty]: Start isEmpty. Operand 1056 states and 1341 transitions. [2022-11-25 18:03:26,166 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2022-11-25 18:03:26,166 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 18:03:26,166 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 4, 4, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 18:03:26,171 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Forceful destruction successful, exit code 0 [2022-11-25 18:03:26,366 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable60,53 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 18:03:26,367 INFO L420 AbstractCegarLoop]: === Iteration 62 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 18:03:26,367 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 18:03:26,367 INFO L85 PathProgramCache]: Analyzing trace with hash 834058321, now seen corresponding path program 20 times [2022-11-25 18:03:26,367 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-25 18:03:26,367 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1185623389] [2022-11-25 18:03:26,367 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 18:03:26,367 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 18:03:26,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 18:03:28,201 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-11-25 18:03:28,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 18:03:28,203 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-11-25 18:03:28,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 18:03:28,205 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 9 proven. 78 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2022-11-25 18:03:28,206 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-25 18:03:28,206 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1185623389] [2022-11-25 18:03:28,206 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1185623389] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 18:03:28,206 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [571967223] [2022-11-25 18:03:28,206 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-25 18:03:28,206 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 18:03:28,206 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 [2022-11-25 18:03:28,207 INFO L229 MonitoredProcess]: Starting monitored process 54 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 18:03:28,209 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Waiting until timeout for monitored process [2022-11-25 18:03:28,652 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-25 18:03:28,652 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 18:03:28,655 INFO L263 TraceCheckSpWp]: Trace formula consists of 313 conjuncts, 87 conjunts are in the unsatisfiable core [2022-11-25 18:03:28,657 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 18:03:31,819 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-25 18:03:31,820 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 27 treesize of output 11 [2022-11-25 18:03:31,877 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 12 proven. 101 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-25 18:03:31,877 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 18:03:33,331 INFO L321 Elim1Store]: treesize reduction 17, result has 83.5 percent of original size [2022-11-25 18:03:33,331 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 93 [2022-11-25 18:03:35,592 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 9 proven. 53 refuted. 0 times theorem prover too weak. 54 trivial. 0 not checked. [2022-11-25 18:03:35,592 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [571967223] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 18:03:35,592 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 18:03:35,592 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 32, 20] total 73 [2022-11-25 18:03:35,593 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [200623523] [2022-11-25 18:03:35,593 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 18:03:35,593 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 73 states [2022-11-25 18:03:35,593 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-25 18:03:35,594 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2022-11-25 18:03:35,594 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=406, Invalid=4850, Unknown=0, NotChecked=0, Total=5256 [2022-11-25 18:03:35,595 INFO L87 Difference]: Start difference. First operand 1056 states and 1341 transitions. Second operand has 73 states, 73 states have (on average 2.328767123287671) internal successors, (170), 72 states have internal predecessors, (170), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2022-11-25 18:03:52,380 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 18:03:52,380 INFO L93 Difference]: Finished difference Result 2614 states and 3358 transitions. [2022-11-25 18:03:52,381 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2022-11-25 18:03:52,381 INFO L78 Accepts]: Start accepts. Automaton has has 73 states, 73 states have (on average 2.328767123287671) internal successors, (170), 72 states have internal predecessors, (170), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 78 [2022-11-25 18:03:52,381 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 18:03:52,385 INFO L225 Difference]: With dead ends: 2614 [2022-11-25 18:03:52,386 INFO L226 Difference]: Without dead ends: 2389 [2022-11-25 18:03:52,388 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 238 GetRequests, 113 SyntacticMatches, 0 SemanticMatches, 125 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4406 ImplicationChecksByTransitivity, 9.9s TimeCoverageRelationStatistics Valid=1469, Invalid=14533, Unknown=0, NotChecked=0, Total=16002 [2022-11-25 18:03:52,388 INFO L413 NwaCegarLoop]: 182 mSDtfsCounter, 1372 mSDsluCounter, 5574 mSDsCounter, 0 mSdLazyCounter, 7806 mSolverCounterSat, 226 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1384 SdHoareTripleChecker+Valid, 5756 SdHoareTripleChecker+Invalid, 8032 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 226 IncrementalHoareTripleChecker+Valid, 7806 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.7s IncrementalHoareTripleChecker+Time [2022-11-25 18:03:52,389 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1384 Valid, 5756 Invalid, 8032 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [226 Valid, 7806 Invalid, 0 Unknown, 0 Unchecked, 6.7s Time] [2022-11-25 18:03:52,391 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2389 states. [2022-11-25 18:03:53,859 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2389 to 1062. [2022-11-25 18:03:53,860 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1062 states, 1021 states have (on average 1.268364348677767) internal successors, (1295), 1026 states have internal predecessors, (1295), 28 states have call successors, (28), 13 states have call predecessors, (28), 12 states have return successors, (24), 22 states have call predecessors, (24), 24 states have call successors, (24) [2022-11-25 18:03:53,862 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1062 states to 1062 states and 1347 transitions. [2022-11-25 18:03:53,862 INFO L78 Accepts]: Start accepts. Automaton has 1062 states and 1347 transitions. Word has length 78 [2022-11-25 18:03:53,862 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 18:03:53,863 INFO L495 AbstractCegarLoop]: Abstraction has 1062 states and 1347 transitions. [2022-11-25 18:03:53,863 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 73 states, 73 states have (on average 2.328767123287671) internal successors, (170), 72 states have internal predecessors, (170), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2022-11-25 18:03:53,863 INFO L276 IsEmpty]: Start isEmpty. Operand 1062 states and 1347 transitions. [2022-11-25 18:03:53,866 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2022-11-25 18:03:53,866 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 18:03:53,866 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 18:03:53,873 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Forceful destruction successful, exit code 0 [2022-11-25 18:03:54,069 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable61,54 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 18:03:54,070 INFO L420 AbstractCegarLoop]: === Iteration 63 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 18:03:54,070 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 18:03:54,070 INFO L85 PathProgramCache]: Analyzing trace with hash 1562188599, now seen corresponding path program 5 times [2022-11-25 18:03:54,070 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-25 18:03:54,071 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1424897130] [2022-11-25 18:03:54,071 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 18:03:54,071 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 18:03:54,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 18:03:54,541 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-11-25 18:03:54,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 18:03:54,543 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-11-25 18:03:54,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 18:03:54,545 INFO L134 CoverageAnalysis]: Checked inductivity of 124 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 74 trivial. 0 not checked. [2022-11-25 18:03:54,545 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-25 18:03:54,545 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1424897130] [2022-11-25 18:03:54,546 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1424897130] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 18:03:54,546 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1639331419] [2022-11-25 18:03:54,546 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2022-11-25 18:03:54,546 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 18:03:54,546 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 [2022-11-25 18:03:54,547 INFO L229 MonitoredProcess]: Starting monitored process 55 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 18:03:54,550 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd39426e-4557-42e1-ad96-158c2098d1cb/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Waiting until timeout for monitored process [2022-11-25 18:04:27,430 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2022-11-25 18:04:27,431 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 18:04:27,449 INFO L263 TraceCheckSpWp]: Trace formula consists of 320 conjuncts, 95 conjunts are in the unsatisfiable core [2022-11-25 18:04:27,452 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 18:04:28,074 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-25 18:04:29,597 INFO L321 Elim1Store]: treesize reduction 38, result has 47.9 percent of original size [2022-11-25 18:04:29,598 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 79 treesize of output 70 [2022-11-25 18:04:29,679 INFO L134 CoverageAnalysis]: Checked inductivity of 124 backedges. 9 proven. 111 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-25 18:04:29,680 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 18:04:32,683 INFO L134 CoverageAnalysis]: Checked inductivity of 124 backedges. 18 proven. 52 refuted. 0 times theorem prover too weak. 54 trivial. 0 not checked. [2022-11-25 18:04:32,683 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1639331419] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 18:04:32,684 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 18:04:32,684 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 32, 21] total 65 [2022-11-25 18:04:32,684 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2040397214] [2022-11-25 18:04:32,684 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 18:04:32,685 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 65 states [2022-11-25 18:04:32,685 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-25 18:04:32,686 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2022-11-25 18:04:32,687 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=286, Invalid=3874, Unknown=0, NotChecked=0, Total=4160 [2022-11-25 18:04:32,687 INFO L87 Difference]: Start difference. First operand 1062 states and 1347 transitions. Second operand has 65 states, 63 states have (on average 2.634920634920635) internal successors, (166), 62 states have internal predecessors, (166), 4 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2022-11-25 18:04:45,467 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-25 18:05:05,931 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.68s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-25 18:05:41,261 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-25 18:05:43,500 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-25 18:05:45,550 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-25 18:05:50,237 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.40s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers []